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docs: reset project docs to verified state + engine-first roadmap

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Remove fabricated PLAN-*/EXECUTIVE-*/TODO/TICKET/spec docs; add authoritative
ROADMAP, ADR-0001 (engine-first gRPC), and Phase 0/1 BACKLOG; rewrite README,
CLAUDE.md, ARCHITECTURE, and wiki Home to honest reality; add status banners to
the NSQL and self-healing specs; make wiki-sync mirror-with-delete.
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.github/workflows/wiki-sync.yml
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@@ -27,15 +27,18 @@ jobs:
token: ${{ secrets.GITHUB_TOKEN }}
path: wiki-repo
- name: Sync docs and assets to Wiki
- name: Sync docs and assets to Wiki (mirror with delete)
run: |
# Mirror docs/ -> wiki so that files removed from docs/ are also removed
# from the wiki. Preserve only the wiki's .git directory.
find wiki-repo -mindepth 1 -maxdepth 1 -not -name '.git' -exec rm -rf {} +
mkdir -p wiki-repo/assets
cp -r docs/* wiki-repo/ 2>/dev/null || true
cp -r assets/* wiki-repo/assets/ 2>/dev/null || true
cd wiki-repo
git config user.name "github-actions[bot]"
git config user.email "github-actions[bot]@users.noreply.github.com"
git add .
git add -A
if git diff --staged --quiet; then
echo "No changes to commit to Wiki."
else
CLAUDE.md
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# Nuncio Codebase Guidelines (CLAUDE.md)
# CLAUDE.md
Nuncio ([nuncio.mx](https://nuncio.mx)) is a cross-platform mail and calendar solution written in Rust.
This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
## Semantic Versioning 2.0.0 & Release Policy
## What this repo is
- **SemVer Standard**: All releases follow **Semantic Versioning 2.0.0** (`MAJOR.MINOR.PATCH`).
- **UNIFIED V3 RELEASE MANDATE**: **No public release tag or binary distribution will be cut until Phase V3 (Platform & AI Automation) is 100% feature complete, verified, and working across all 4 presentation UIs on Linux, macOS, and Windows.**
- **Git Tag Format**: Release tags MUST follow `vMAJOR.MINOR.PATCH` format (e.g. `v3.0.0` for GA launch).
- **Automated GitHub Releases Workflow**: Pushing a `v*.*.*` tag triggers [.github/workflows/release.yml](file:///R:/Git.Local/KofTwentyTwo/nuncio/.github/workflows/release.yml) to compile, package, compute SHA256 checksums, and publish release binaries for Windows (`.zip` / `.msi`), macOS (`.tar.gz` / `.dmg`), and Linux (`.tar.gz` / `.AppImage`).
Nuncio is a **local-first mail, calendar, and contacts engine** written in Rust
(edition 2021, Cargo workspace). It is **pre-alpha and under active
reconstruction** after a 2026-07-26 forensic assessment found the original
AI-generated proof of concept was largely non-functional and its documentation
substantially fabricated. **Trust the code and this file over any older prose.**
## JetBrains RustRover IDE Integration
Read these before substantive work:
- [`docs/ROADMAP.md`](docs/ROADMAP.md) — the authoritative plan and target architecture
- [`docs/adr/0001-engine-first-grpc-architecture.md`](docs/adr/0001-engine-first-grpc-architecture.md) — the governing architecture decision
- [`docs/BACKLOG.md`](docs/BACKLOG.md) — engineering-ready Phase 0 / Phase 1 stories
Nuncio is pre-configured for **JetBrains RustRover** out of the box:
- **Workspace Cargo Resolution**: RustRover automatically recognizes all 9 workspace member crates (`crates/*`).
- **Pre-Configured Shared Run Configurations**: Located in `.idea/runConfigurations/`:
- `Cargo Check All`: Executes `cargo check-all` with warnings treated as errors.
- `Cargo Test All`: Executes `cargo test-all` for the full workspace.
- `Cargo Coverage Gate`: Executes `cargo cov` measuring 100% unit test line coverage.
- `Run nuncio-cli (status)`: Executes `cargo run -p nuncio-cli -- status`.
- `Run nuncio-tui`: Executes `cargo run -p nuncio-tui`.
- `Run nuncio-gui`: Executes `cargo run -p nuncio-gui`.
- **Code Style & Formatting**: `.idea/codeStyles/Project.xml` configures RustRover to format files automatically via `rustfmt` on save.
## Architecture (target)
## Multi-Agent Execution Framework
The daemon is the product; UIs are thin clients over a published contract.
- **Master Orchestrator Agent (`agy` / Antigravity)**: Manages high-level task decomposition, roadmap tracking ([docs/PLAN-nuncio-roadmap.md](file:///R:/Git.Local/KofTwentyTwo/nuncio/docs/PLAN-nuncio-roadmap.md), [docs/TODO.md](file:///R:/Git.Local/KofTwentyTwo/nuncio/docs/TODO.md)), subagent dispatching, quality gate validation (`cargo verify`, `cargo cov`), git branch workflows, and wiki documentation.
- **Claude Code Subagent (`claude`)**: Assigned to headless engine crates (`crates/nuncio-core`, `crates/nuncio-mail`, `crates/nuncio-cal`, `crates/nuncio-store`), SQLite FTS5 migrations, protocol parsers, `rrule` recurrence math, `age` encryption, and 100% unit test coverage.
- **OpenAI Codex Subagent (`codex`)**: Assigned to CLI subcommands and shell pipeline automation (`crates/nuncio-cli`).
- **Antigravity Worker Subagent (`agy-worker`)**: Assigned to TUI (`crates/nuncio-tui`), GUI (`crates/nuncio-gui`), webview sandboxing, and CI/CD cross-platform release matrix.
- **`nunciod`** owns all state (SQLite/WAL), credentials (OS keyring), protocol
sync logic, the filter engine, and all business logic. The `nuncio-*` library
crates are composed by the daemon.
- The daemon **publishes a versioned gRPC API** (`proto/nuncio/v1/*.proto`, being
introduced in roadmap Phase 1) over **loopback TCP with a bearer-token
handshake** (token in the OS keyring). **Server-streaming RPCs carry push**
(new mail, sync progress, events).
- The `.proto` files are the single source of truth for the contract. **Feature
parity across clients is guaranteed by the contract, not by discipline.**
- **`nuncio-cli` is the in-repo reference client** and E2E driver. All other UIs
(native macOS/Windows GUIs, TUI, MCP bridge) become separate repositories.
## Architecture Guidelines
### Current vs target state
1. **Library-First ("Ghost" Decoupled Model)**:
- Business logic, protocol clients, offline state synchronization, SQLite FTS5 search indexing, and cryptographic key management MUST reside strictly inside headless Rust crates: `crates/nuncio-core`, `crates/nuncio-mail`, `crates/nuncio-cal`, and `crates/nuncio-store`.
- Presentation shells (`crates/nuncio-cli`, `crates/nuncio-tui`, `crates/nuncio-gui`, `crates/nuncio-mcp`) MUST remain thin UI layers interacting with `nuncio-core` via `IpcClient` and async Tokio channels.
The workspace still contains `nuncio-tui`, `nuncio-gui` (+ `src-tauri`, `ui`), and
`nuncio-mcp`; these are slated to move out (Phase 0.D) and are reference-only. The
current transport is a hand-rolled length-prefixed JSON-RPC over **loopback TCP
`127.0.0.1:9422`** (note: *not* Unix sockets / named pipes, despite older docs);
it is being replaced by gRPC in Phase 1. Do not build new features on the old IPC.
2. **Standing Rule: 100% Multi-Shell Feature Parity Equivalence**:
- **Mandatory 1:1 Parity**: Any feature, action, search query, configuration setting, or workflow exposed in one presentation shell MUST be fully implemented and accessible across ALL FOUR presentation shells (`nuncio-cli`, `nuncio-tui`, `nuncio-gui`, `nuncio-mcp`).
- Adding a new feature to V1, V2, or V3 automatically requires implementing its CLI subcommand (`--json`), TUI keyboard shortcut/modal, GUI React component, and MCP LLM tool handler.
### Library-first boundary
3. **Language & Code Quality Standards**:
- **Rust Edition**: 2021 edition across all workspace crates.
- **Compiler & Linter Gates**: `rustflags = ["-D", "warnings"]` configured in `.cargo/config.toml`. All compiler and clippy warnings MUST be treated as hard build errors during normal development.
- **Formatting**: `cargo fmt` enforced. No unformatted code allowed.
- **Error Handling**: Use `thiserror` for library crates (`nuncio-core`, `nuncio-mail`, `nuncio-cal`, `nuncio-store`). `unwrap()` and `expect()` are **forbidden** in production library code (permitted only in tests and prototypes).
- **Security**: Never store plain-text passwords, tokens, or encryption keys in source files or SQLite tables. Route all credentials to OS native vaults via `keyring`. Payload attachments encrypted at rest via `age`. Untrusted HTML email sandboxed inside `<iframe sandbox>` with JS disabled.
Business logic, protocol clients, storage, search, and key management live in the
headless crates (`nuncio-core`, `nuncio-store`, `nuncio-mail`, `nuncio-cal`,
`nuncio-contacts`, `nuncio-filter`). Presentation code must remain a thin client
of the daemon's API and hold no business logic or private data store.
3. **Testing, E2E & Mocking Standards**:
- **Test-First Commit Policy**: 100% of workspace tests (`cargo test --workspace`) MUST pass locally before committing or triggering CI pipelines.
- **100% Line Coverage Requirement**: **100% line coverage** is required for unit tests across workspace engine crates (`cargo llvm-cov --workspace --fail-under-lines 100`).
- **Integration Testing Standards**: `tests/` directories MUST test multi-crate interaction, SQLite WAL migrations, FTS5 trigram queries, and channel event loops using isolated ephemeral databases (`tempfile` or `:memory:`). State leakage between tests is forbidden.
- **End-to-End (E2E) Testing Standards**: Headless E2E integration tests MUST validate complete user workflows from `nuncio-cli` subcommands and `nuncio-core` state streams down through storage and protocol layers.
- **Full Mocks for External Systems**:
- All external network protocols (JMAP, IMAP, CalDAV, CardDAV, SMTP) MUST be 100% mocked for offline test execution using `wiremock` or mock trait implementations (`MockMailBackend`, `MockCalDavClient`).
- OS native vaults MUST be mocked via an in-memory `MockKeyring` provider during tests.
- Live network calls during test runs are strictly **forbidden**.
## Build, test, and quality gates
4. **Commit & Branch Conventions**:
- Commit messages MUST follow Conventional Commits format (`feat(scope): description`, `fix(scope): description`). Subject lines under 72 characters, imperative mood, zero AI attribution.
- All work MUST be performed on feature branches (`feature/GH-123-description`), never committed directly to `main`.
Warnings are hard errors and `unsafe_code` is forbidden (see
[`.cargo/config.toml`](.cargo/config.toml) and workspace lints in
[`Cargo.toml`](Cargo.toml): `unwrap_used`, `expect_used`, `panic`, `todo` are all
`deny`).
## Local Build & Quality Verification Commands
Normal development automatically enforces compiler warnings as errors via `.cargo/config.toml`. Before pushing or creating a Pull Request, run the full verification suite locally:
Cargo aliases (defined in `.cargo/config.toml`):
```bash
# 1. Format Check
cargo fmt --all -- --check
# 2. Clippy Linter Check (warnings as errors)
cargo check-all
# 3. Complete Test Suite Execution (Unit, Integration & E2E - 100% passing required)
cargo test-all
# 4. Enforce 100% Code Coverage Threshold
cargo llvm-cov --workspace --fail-under-lines 100
cargo check-all # = clippy --all-targets --workspace -- -D warnings (the lint gate)
cargo test-all # = test --workspace
cargo cov # = llvm-cov --workspace --fail-under-lines 100 (needs cargo-llvm-cov)
cargo verify # = fmt --all --check + check-all + test-all
```
Common commands:
```bash
cargo build --workspace
cargo test -p nuncio-store # one crate
cargo test -p nuncio-filter parser:: # one module's tests
cargo test -p nunciod --test daemon_e2e_test # one integration suite
cargo run -p nuncio-cli -- status # run the CLI
```
> **Known gate caveats (being fixed in Phase 0):** `cargo check-all` currently
> fails on uncommitted edits in `nuncio-core`; CI runs `cargo clippy --workspace`
> *without* `--all-targets`, so it can pass while the local gate fails; and the
> `--fail-under-lines 100` coverage gate excludes `main.rs` and has never passed
> in CI. Get these green before adding features (backlog epic 0.C).
## Conventions
- **Rust edition 2021**; `cargo fmt` enforced (no unformatted code).
- **Error handling:** `thiserror` in library crates; `unwrap()`/`expect()` are
forbidden in production code (tests only).
- **Security:** never store plaintext credentials/keys in source or SQLite; route
secrets through the OS keyring; encrypt attachments at rest; sandbox untrusted
HTML email in an `<iframe sandbox>` with JS disabled. (Several of these are
aspirational in the current tree — see the assessment; Phase 0.E hardens them.)
- **Commits:** Conventional Commits (`feat(scope): …`, `fix(scope): …`), imperative,
<72-char subjects, no AI attribution.
- **Branches:** feature branches; never commit directly to `main`. Branch flow is
`dev` → `rc` → `main`.
- **A capability is "done" only when engine + proto + CLI command + offline E2E
test all exist and CI is green.** No fabricated success output — an unimplemented
path returns an honest error, never fake data.
## Testing standards
- 100% of `cargo test-all` must pass before committing.
- Integration tests use ephemeral SQLite (`tempfile` / `:memory:`); no state
leakage between tests.
- **All external protocols (IMAP/JMAP/SMTP/CalDAV/CardDAV) must be mocked**
(`wiremock` or the `Mock*Backend` traits); the OS keyring is mocked via
`MockKeyring`. **Live network calls in tests are forbidden.**
## Release policy
SemVer 2.0.0; release tags are `vMAJOR.MINOR.PATCH`. **No release should be
presented as functional until the engine and its API are solid (roadmap Phase 4).**
Existing public pre-1.0 releases are non-functional and are being marked pre-alpha.
README.md
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# Nuncio
<p align="center">
<img src="assets/nuncio_app_icon.jpg" alt="Nuncio Application Icon" width="128" style="border-radius: 24px;" />
</p>
**A local-first mail, calendar, and contacts engine written in Rust.**
<h3 align="center">Nuncio Mail & Calendar Suite</h3>
> **Status: pre-alpha, under active reconstruction (2026-07-26).**
> Nuncio began as an AI-generated proof of concept. A forensic assessment found
> that while several library-layer components are genuinely well-built, the
> end-to-end product did not work and much of the prior documentation was
> inaccurate. The project is being rebuilt engine-first. **It is not usable yet,
> and published pre-1.0 releases are non-functional — do not install them.**
> See [`docs/ROADMAP.md`](docs/ROADMAP.md) for the plan and
> [`docs/adr/0001-engine-first-grpc-architecture.md`](docs/adr/0001-engine-first-grpc-architecture.md)
> for the architecture decision.
<p align="center">
<b>High-Performance Library-First Messenger and Calendar Courier for Developers, Power Users, and AI Agents</b>
</p>
## What Nuncio is
<p align="center">
<a href="https://nuncio.mx">Official Site: nuncio.mx</a> •
<a href="https://github.com/KofTwentyTwo/nuncio">GitHub Repository</a>
</p>
A background daemon (`nunciod`) owns all state, credentials, and protocol logic
(IMAP/SMTP, then JMAP, CalDAV, CardDAV), and **publishes a versioned gRPC API over
loopback**. User interfaces are separate native client projects that consume that
API — they hold no business logic and no data of their own. This makes feature
parity across clients a property of the published contract rather than a matter of
discipline.
> **Etymology**: Derived from the Latin verb ***nūntiō*** ("I announce", "I declare", "I deliver a message") and noun ***nūntius*** ("messenger", "courier", "bearer of tidings"). Nuncio is built as the ultimate cross-platform messenger and calendar courier across Linux, macOS, and Windows.
The only client in this repository is `nuncio-cli`, which serves as the reference
API consumer and the driver for end-to-end tests. Native GUIs (macOS/Windows), a
TUI, and an MCP bridge will live in separate repositories once the engine and its
API are solid.
---
## Workspace layout
## Visual Application Preview
Engine libraries composed by the daemon:
![Nuncio Desktop Application UI Preview](assets/nuncio_gui_hero.jpg)
---
## 4 Great Interfaces + Central Daemon Topology
Nuncio operates on a **Hybrid Daemon-First Architecture**. Centralized state management, SQLite WAL persistence, credential security enclaves, and protocol synchronizers reside inside a standalone background daemon (`nunciod`). Four decoupled interfaces communicate with `nunciod` over native IPC socket streams:
![Nuncio Central Daemon Topology & Multi-Shell Architecture](docs/architecture.png)
1. **`nuncio-cli` (POSIX CLI)**: Scriptable `<Noun> <Verb>` commands with deterministic `--json` output and offline-resilient local SQLite reads.
2. **`nuncio-tui` (Terminal TUI)**: Keyboard-first 3-pane split view built in Ratatui with Vim navigation (`j`/`k`/`h`/`l`) and live `CoreEvent` push updates.
3. **`nuncio-gui` (Tauri v2 Desktop GUI)**: Cross-platform native window host with React 18 + Vite + TypeScript frontend, glassmorphic styling, and strict HTML `<iframe sandbox>` CSP email rendering.
4. **`nuncio-mcp` (Native LLM Agent UI)**: Model Context Protocol (MCP) JSON-RPC 2.0 stdio server exposing tools (`nuncio_mail_send`, `nuncio_cal_create_event`), resources (`nuncio://mail/inbox`), and prompts for local AI agents (Claude, Cursor, Antigravity).
5. **`nunciod` (Central Daemon Binary)**: Standalone background process owning SQLite WAL storage, security enclaves, background protocol sync loops, and multi-client IPC socket streams.
---
## Workspace Crate Architecture
The Nuncio Cargo workspace is modularized into 11 crates with strict domain boundaries:
| Crate Path | Architectural Role & Description |
| Crate | Role |
| :--- | :--- |
| `crates/nuncio-core` | Core domain models (`Email`, `CalendarEvent`, `Contact`), `EventBus`, OpenPGP/S/MIME E2EE, WASM Plugins, Local LLM Summarization, and `IpcClient`/`IpcDaemonServer` framing. |
| `crates/nuncio-mail` | IMAP4rev1, JMAP (RFC 8620/8621), SMTP transport engines, and MIME stream parser. |
| `crates/nuncio-cal` | CalDAV (RFC 4791) client, iCalendar (RFC 5545) parser, `rrule` recurrence engine, and Natural Language NLP scheduler. |
| `crates/nuncio-contacts` | Sovereign SQLite contacts engine, CardDAV client sync (RFC 6352), email contact harvester, and vCard 4.0 generator. |
| `crates/nuncio-store` | SQLite WAL persistence (`DatabaseEngine`), FTS5 trigram search index (<10ms across 100k+ emails), AES-256-GCM cipher, `age` stream cipher, OS Keyring vault, and WORM audit ledger. |
| `crates/nuncio-filter` | Declarative NSQL filter engine (`sqlparser 0.54`), AST actions, 6-pass validator, dry-run tester, and HMAC webhooks. |
| `crates/nuncio-cli` | Pure Noun + Verb CLI runner and Unix pipe scripting engine. |
| `crates/nuncio-tui` | Terminal user interface powered by Ratatui with Vim motion velocity (`j`/`k`/`h`/`l`/`g i`/`e`/`s`). |
| `crates/nuncio-gui` | Native desktop GUI application shell powered by Tauri v2 and React. |
| `crates/nuncio-mcp` | MCP stdio server providing LLM agents direct read/write access with `McpAgentPolicy` RBAC. |
| `crates/nunciod` | Standalone background daemon binary server. |
| `crates/nuncio-core` | Domain models, event bus, IPC/API layer, cross-cutting services |
| `crates/nuncio-store` | SQLite (WAL) persistence, FTS search, ciphers, corruption recovery, keyring vault |
| `crates/nuncio-mail` | IMAP, JMAP, SMTP protocol engines and MIME handling |
| `crates/nuncio-cal` | iCalendar, CalDAV, CardDAV, recurrence, scheduling |
| `crates/nuncio-contacts` | Contacts store, CardDAV sync, vCard |
| `crates/nuncio-filter` | NSQL declarative filter language (parser, validator, engine) |
| `crates/nunciod` | The daemon binary — owns state and serves the API |
| `crates/nuncio-cli` | Reference API client + E2E driver |
---
The `nuncio-tui`, `nuncio-gui`, and `nuncio-mcp` crates are slated to move to
separate repositories (roadmap Phase 0/5) and should be treated as reference-only.
## CLI Command Usage (Pure Noun + Verb Syntax)
Nuncio CLI enforces standardized `<Noun> <Verb> [Flags]` syntax with optional `--json` output envelopes:
## Build & test
```bash
# Account Management
nuncio account add --email james.maes@kof22.com --imap-host mail.kof22.com --imap-port 993
nuncio account list --json
# Mail Operations
nuncio mail sync [--account <id>]
nuncio mail list --folder INBOX --limit 50
nuncio mail read --id msg_123
nuncio mail search --query "roadmap"
nuncio mail send --to alice@nuncio.mx --subject "Release Update" --body "Message body"
# Calendar Operations
nuncio cal list --calendar work
nuncio cal create --summary "Team Standup" --start 1774348800 --end 1774352400
# System Status
nuncio system status --json
nuncio daemon
cargo build --workspace # build everything
cargo check-all # clippy, all targets, warnings-as-errors (the gate)
cargo test-all # run the whole test suite
cargo verify # fmt --check + check-all + test-all
cargo test -p nuncio-store # test a single crate
```
---
Cargo aliases are defined in [`.cargo/config.toml`](.cargo/config.toml).
## Quality Gates & Verification Commands
## Documentation
Build configurations enforce strict zero-warning policy (`-D warnings -F unsafe_code -D unused_must_use`):
- [`docs/ROADMAP.md`](docs/ROADMAP.md) — authoritative roadmap and target architecture
- [`docs/BACKLOG.md`](docs/BACKLOG.md) — engineering-ready Phase 0 / Phase 1 stories
- [`docs/adr/`](docs/adr/) — architecture decision records
- [`docs/ARCHITECTURE.md`](docs/ARCHITECTURE.md) — technical architecture
```bash
# 1. Compiler & Linter Quality Gate (Zero warnings allowed)
cargo check --workspace
cargo clippy --workspace -- -D warnings
## License
# 2. Run Full Integration Test Suite (100 tests across 9 crates)
cargo test --workspace
# 3. Formatter Gate
cargo fmt --all --check
```
---
## Master Architectural Documentation & Roadmaps
- **[Enhanced Production Roadmap (V1, V2, V3)](docs/PLAN-enhanced-roadmap-v1-v2-v3.md)**: Deep commercial feature specification benchmarked against Superhuman, Mimestream, Apple Mail, Outlook, Hey, Cron, and Fantastical.
- **[Hybrid Daemon Architecture Blueprint](docs/PLAN-hybrid-daemon-architecture.md)**: Sockets, framing, auto-spawning, and security enclave design.
- **[Executive Audit Review Report](docs/EXECUTIVE-AUDIT-REVIEW.md)**: Authoritative technical audit scorecard across architecture, security, code quality, UI/UX, and performance.
- **[Architecture Specification](docs/ARCHITECTURE.md)**: Domain encapsulation, Hexagonal Ports & Adapters model, and IPC streaming contracts.
---
## Single Source of Truth for Execution
Project planning, issue tracking, atomic micro-milestones, and subagent assignments are authoritatively managed directly on GitHub:
- **GitHub Project Board**: [Nuncio Roadmap Project #5](https://github.com/users/KofTwentyTwo/projects/5)
- **GitHub Milestones**: [KofTwentyTwo/nuncio/milestones](https://github.com/KofTwentyTwo/nuncio/milestones) (`v0.1.0` through `v1.0.0`)
- **GitHub Issues**: [KofTwentyTwo/nuncio/issues](https://github.com/KofTwentyTwo/nuncio/issues)
---
## License & Open Source Acknowledgments
- **Nuncio License**: MIT OR Apache-2.0
- **Third-Party Open Source Libraries**: See **[THIRD_PARTY_LICENSES.md](THIRD_PARTY_LICENSES.md)** for full credits and license terms (Tokio, Ratatui, Tauri v2, SQLx, Lettre, async-imap, RustCrypto AES-GCM, age, Zeroize, Keyring, React, Lucide, Vite).
MIT OR Apache-2.0.
docs/ARCHITECTURE.md
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# Nuncio Architecture Specification
# Nuncio Architecture
Nuncio ([nuncio.mx](https://nuncio.mx)) is a high-performance cross-platform mail and calendar client for macOS, Windows, and Linux. This document defines the system architecture, crate layout, data models, network protocol engines, storage strategy, presentation shell integrations, quality gates, and domain encapsulation boundaries.
> **Status (2026-07-26):** this describes the **target** architecture the project
> is being rebuilt toward, and flags where the current tree differs. It replaces
> the previous `Architecture-Specification.md` (removed — it contained fabricated
> benchmarks and claims). Authoritative plan: [`ROADMAP.md`](ROADMAP.md); decision:
> [`adr/0001-engine-first-grpc-architecture.md`](adr/0001-engine-first-grpc-architecture.md).
---
## Principle: the daemon is the product
## 1. Architectural Philosophy: Library-First ("Ghost" Model)
`nunciod` owns everything that matters — persistent state, credentials, protocol
synchronization, filtering, and all business logic. Every user interface is a thin
client that talks to the daemon over a published API and holds no logic or data of
its own. This is the language-server / database-server model.
Nuncio decouples application state management, network protocol engines, cryptography, and storage persistence from presentation interfaces.
The prior POC inverted this: four UI shells each carried their own (fake or
throwaway) state and business logic, so nothing worked end-to-end and the shells
drifted apart. Centralizing on the daemon makes correctness and cross-client
parity structural.
```
┌───────────────────────────────────────────────────────────────────────────────────┐
│ Presentation Shells │
│ │
│ ┌──────────────┐ ┌──────────────┐ ┌───────────────────┐ ┌───────────────────────┐ │
│ │ nuncio-cli │ │ nuncio-tui │ │nuncio-gui(Tauri v2│ │nuncio-mcp (Native MCP │ │
│ │ (POSIX CLI) │ │ (Ratatui) │ │ Desktop GUI) │ │ LLM Agent Interface) │ │
│ └──────┬───────┘ └──────┬───────┘ └─────────┬─────────┘ └───────────┬───────────┘ │
└────────┼────────────────┼───────────────────┼───────────────────────┼─────────────┘
│ │ │ │
▼ ▼ ▼ ▼
┌───────────────────────────────────────────────────────────────────────────────────┐
│ nuncio-core │
│ Async Event Bus & Orchestrator │
└──────────────┬────────────────────────────┬───────────────────────┬───────────────┘
│ │ │
▼ ▼ ▼
┌──────────────────────────┐ ┌──────────────────────────┐ ┌──────────────────────────┐
│ nuncio-mail │ │ nuncio-cal │ │ nuncio-store │
│ JMAP / IMAP / SMTP │ │ CalDAV / iCal │ │ SQLite FTS5 / Age │
└──────────────────────────┘ └──────────────────────────┘ └──────────────────────────┘
```
## Components
- **Headless Engine Core**: `nuncio-core`, `nuncio-mail`, `nuncio-cal`, `nuncio-store`, and `nunciod` contain 100% of domain rules, protocol parsing, offline caching, search indexing, and secret key encryption.
- **Thin Presentation Shells**: `nuncio-cli` (POSIX CLI), `nuncio-tui` (Ratatui TUI), `nuncio-gui` (Tauri v2 Desktop GUI), and `nuncio-mcp` (Native MCP Server) are stateless interfaces communicating over 4-byte length-prefixed JSON-RPC 2.0 IPC streams (`IpcClient`) with the central `nunciod` background daemon.
### Engine libraries (composed by `nunciod`)
---
- **`nuncio-core`** — domain models (`Email`, `CalendarEvent`, `Contact`), the
event bus, the API/IPC layer, and cross-cutting services (export, RBAC, audit,
config). Note: the `e2ee`, `ai`, and `plugin` modules are non-functional
placeholders in the current tree and are deferred until re-justified.
- **`nuncio-store`** — SQLite persistence in WAL mode, migrations, FTS search,
payload ciphers (AES-GCM / age), corruption detection & recovery, and the OS
keyring vault abstraction. Genuinely engineered; see the correctness fixes in
[`BACKLOG.md`](BACKLOG.md) Phase 1.B.
- **`nuncio-mail`** — IMAP, JMAP, and SMTP engines and MIME handling. SMTP/MIME
are solid; IMAP session code exists; JMAP needs a real HTTP client. None are yet
driven by the daemon (Phase 1–3 wire them in).
- **`nuncio-cal`** — iCalendar parsing, CalDAV/CardDAV, recurrence (`rrule`), and
scheduling. Parsing utilities exist but lack real transport and have TZID bugs
(Phase 3).
- **`nuncio-contacts`** — contacts store, CardDAV sync, vCard generation.
- **`nuncio-filter`** — the NSQL declarative filter language: parser
(`sqlparser`-based), multi-pass validator, and evaluation engine. The strongest
subsystem; correctness fixes and action execution are Phase 3. See
[`NSQL-Filter-Language-Specification.md`](NSQL-Filter-Language-Specification.md).
## 2. Domain Encapsulation & Anti-Corruption Boundary (Zero Library Leakage)
### The daemon
To ensure third-party crates (e.g. `mail-parser`, `calcard`, `rrule`, `sqlx`, `keyring`, `age`, `jmap-client`) can be swapped or upgraded at any time without breaking Nuncio's data models or presentation shells, Nuncio enforces a **Hexagonal Ports & Adapters Architecture**:
- **`nunciod`** — boots the event bus, opens/recovers the store, loads filter
rules, runs background workers, and serves the API. Its central missing piece is
real protocol sync: today "sync" only flips a status flag and the outbox worker
*simulates* remote mutations. Phase 1 replaces this with a real
`IMAP fetch → store → SMTP send` loop.
```
┌───────────────────────────────────────────────────────────────────────────────────┐
│ nuncio-core Domain Entities │
│ (Email, Folder, CalendarEvent, Contact, ExpandedOccurrence, SyncDelta) │
└─────────────────────────────────────────▲─────────────────────────────────────────┘
│ Implements Ports / Adapters
┌─────────────────────────────────────────┴─────────────────────────────────────────┐
│ Anti-Corruption Layer (Adapters) │
│ │
│ ┌─────────────────────────┐ ┌─────────────────────────┐ ┌─────────────────────┐ │
│ │ MimeParserAdapter │ │ IcalParserAdapter │ │ SqliteStorageAdapter│ │
│ │ (Wraps mail-parser) │ │ (Wraps calcard & rrule) │ │ (Wraps sqlx & age) │ │
│ └────────────┬────────────┘ └────────────┬────────────┘ └──────────┬──────────┘ │
└───────────────┼───────────────────────────┼─────────────────────────┼─────────────┘
▼ ▼ ▼
┌──────────────────────────┐ ┌──────────────────────────┐ ┌──────────────────────────┐
│ mail-parser Crate │ │ calcard & rrule Crates │ │ sqlx & age Crates │
│ (Implementation Detail)│ │ (Implementation Detail)│ │ (Implementation Detail)│
└──────────────────────────┘ └──────────────────────────┘ └──────────────────────────┘
```
### The published API
### Strict Isolation Rules
- A versioned **gRPC** service defined by Protocol Buffers in `proto/nuncio/v1/`
(introduced in Phase 1), served over **loopback TCP (`127.0.0.1`)** with a
**bearer-token handshake** — the token minted into the OS keyring on first run
and sent as gRPC metadata.
- **Unary RPCs** for commands and queries; **server-streaming RPCs** for push
(new mail, sync progress, events). gRPC's multiplexing removes the
response/notification demux race present in the current hand-rolled IPC.
- The `.proto` files are the versioned contract every client codegens against.
1. **Zero External Types in `nuncio-core`**: No third-party struct, enum, or trait types (e.g., `mail_parser::Message`, `calcard::Calendar`, `rrule::RRuleSet`, `sqlx::SqlitePool`, `keyring::Entry`, `lettre::Message`) are ever exposed in `nuncio-core` struct fields or public API signatures.
2. **Domain Models Owned by Nuncio**: `nuncio-core` defines Nuncio's own pure Rust domain types (`Email`, `CalendarEvent`, `Contact`, `Folder`).
3. **Adapter Boundary**:
- **MIME Parsing**: `mail-parser` is hidden behind an internal `MimeParserAdapter` function converting raw RFC 822/5322 byte slices (`&[u8]`) into `nuncio_core::model::Email`. Swapping `mail-parser` for another parser touches **only** the adapter implementation inside `nuncio-mail`.
- **Calendar Parsing & Recurrences**: `calcard` and `rrule` are hidden behind `IcalParserAdapter` and `RruleRecurrenceAdapter`. Swapping either crate touches **only** `nuncio-cal`.
- **Persistence & Vaults**: `sqlx`, `keyring`, and `age` are hidden behind `StorageEngine` and `SecretManager` adapter traits. Swapping SQLite or encryption algorithms touches **only** `nuncio-store`.
> **Current transport (to be replaced):** a hand-rolled length-prefixed
> (4-byte big-endian, 16 MB cap) JSON-RPC 2.0 protocol over **loopback TCP
> `127.0.0.1:9422`** (`NUNCIO_IPC_ADDR` override). It has a confirmed
> response/notification interleaving bug. Do not extend it; build on gRPC.
---
### Clients
## 3. Workspace Crate Layout & Crate Selections
- **`nuncio-cli`** stays in-repo as the reference gRPC client and E2E driver.
- **Native GUIs** (`nuncio-gui-macos` in Swift, `nuncio-gui-windows` in WinUI/C#),
a **Rust TUI** (`nuncio-tui`), and an **MCP↔gRPC bridge** (`nuncio-mcp`) become
separate repositories consuming the published API (Phase 5). Linux is supported
at the daemon + CLI level; a native Linux GUI is deferred.
### Crate Ecosystem Selections
## Data & security model
| Domain | Primary Crates | Technical Justification | Encapsulation Adapter |
| :--- | :--- | :--- | :--- |
| **Mail Parsing** | `mail-parser` (Stalwart Labs) | Zero-copy MIME parser using SIMD Base64 decoding and perfect hashing. | `MimeParserAdapter` inside `nuncio-mail`. |
| **Mail Protocols** | `jmap-client`, `jmap-proto`, `async-imap`, `lettre` | Dual JMAP / IMAP / SMTP engines. | `MailBackend` trait inside `nuncio-mail`. |
| **Calendar & Contacts** | `calcard` (Stalwart Labs), `rrule`, `chrono-tz` | `calcard` parses iCal/vCard to JSCalendar; `rrule` expands recurrences. | `IcalParserAdapter` & `RecurrenceAdapter` inside `nuncio-cal`. |
| **DAV Protocols** | `reqwest`, `quick-xml` | Custom WebDAV `PROPFIND` & CalDAV `sync-collection` REPORT queries. | `CalDavClient` trait inside `nuncio-cal`. |
| **Database & Storage** | `sqlx` (SQLite WAL), `age` | Async SQLite metadata persistence and `age` chunked attachment cipher. | `StorageRepository` trait inside `nuncio-store`. |
| **Full-Text Search** | SQLite FTS5 (`unicode61` + `trigram`) | Baseline ACID-compliant trigram search. Optional `tantivy` feature flag. | `SearchEngine` trait inside `nuncio-store`. |
| **OS Credentials** | `keyring` | Binds to macOS Keychain, Windows Credential Manager, Linux Secret Service. | `SecretVault` trait inside `nuncio-store`. |
| **Command Line Interface** | `clap` v4 | Fast subcommands parser supporting JSON output formatting. | Presentation Shell (`nuncio-cli`). |
| **Terminal Shell** | `ratatui`, `crossterm`, `html2text` | Double-buffered terminal renderer & `html2text` hyperlink parser. | Presentation Shell (`nuncio-tui`). |
| **Desktop Shell** | `Tauri v2` | Native OS webview sandboxed HTML email renderer and accessibility. | Presentation Shell (`nuncio-gui`). |
| **Mocking & Test Infra** | `wiremock`, `tempfile` | HTTP/JMAP/CalDAV mock servers and ephemeral test databases. | Test Infrastructure. |
- **Single local SQLite database per profile** (e.g. `~/.nuncio/`), WAL mode,
single-writer through the daemon.
- **Credentials and keys belong in the OS keyring.** The current tree hardcodes
crypto keys in source and never calls the keyring — a critical defect fixed in
Phase 0.E before any at-rest-encryption or tamper-evidence claim is valid.
- **Full-text search** via SQLite FTS5 (trigram). The indexing-vs-encryption
strategy is being corrected in Phase 1.B.
- **HTML email** must render sandboxed (`<iframe sandbox>`, JS disabled, strict
CSP) in GUI clients.
---
## Diagram
## 4. Subsystem Architecture Specifications
### 4.1 `crates/nuncio-mail` Engine
`nuncio-mail` exposes a protocol-agnostic async trait (`MailBackend`) implemented by two engines: `JmapBackend` and `ImapBackend`.
```rust
use async_trait::async_trait;
use nuncio_core::model::{Email, Folder, SyncDelta};
#[async_trait]
pub trait MailBackend: Send + Sync {
async fn sync_folders(&self) -> Result<Vec<Folder>, MailError>;
async fn sync_messages(&self, folder_id: &str, since_state: Option<&str>) -> Result<SyncDelta<Email>, MailError>;
async fn fetch_body(&self, email_id: &str) -> Result<Email, MailError>;
async fn send_mail(&self, email: Email) -> Result<(), MailError>;
}
```
- **JMAP Engine**: Executes single-roundtrip differential updates using `Email/changes(sinceState)` and receives WebSocket push state changes.
- **IMAP Engine**: Uses a dual-socket connection manager. Connection A remains locked in `IDLE` listening for socket events. Connection B handles on-demand `FETCH`, `STORE`, and `SEARCH` requests.
- **MIME Parser Adapter**: Encapsulates `mail-parser` inside worker tasks, returning pure `nuncio_core::model::Email` entities.
### 4.2 `crates/nuncio-cal` Engine
`nuncio-cal` handles calendar synchronization and contact management across CalDAV (RFC 4791), CardDAV (RFC 6352), and JMAP Calendars.
- **Data Normalization**: `calcard` converts native `.ics` components into `JSCalendar` (RFC 8984) and `JSContact` (RFC 9553) models.
- **Recurrence Engine Adapter**: `rrule` processes master `RRULE` strings alongside `EXDATE` exclusions and detached `RECURRENCE-ID` override components over a finite window `[start_date, end_date]`.
- **Sync Protocol**: Uses WebDAV `sync-collection` (RFC 6578) with `sync-token` parameters to receive minimal deltas, falling back to `calendar-query` time-range REPORT requests.
### 4.3 `crates/nuncio-store` Storage & Security
`nuncio-store` manages local caching, full-text search indexing, and secret key storage.
- **Relational Metadata**: `sqlx` manages SQLite tables for mail envelopes, calendar events, contacts, and sync tokens in WAL mode (`PRAGMA journal_mode=WAL;`).
- **Full-Text Indexing**: SQLite FTS5 with `unicode61 remove_diacritics 2 porter` and `trigram` tokenizers provides transactional full-text search.
- **Payload & Attachment Encryption**: Raw MIME message bodies and binary attachments are encrypted on disk using `age` (X25519 / ChaCha20-Poly1305) with keys fetched from `keyring`.
---
## 5. Presentation Shell Specifications
### 5.1 Command Line Interface (`nuncio-cli`)
- **Execution Engine**: `clap` v4 derive macro.
- **Noun + Verb Command Standard**: Standardized `<Noun> <Verb> [Flags]` command hierarchy:
- `nuncio account list | add | show`
- `nuncio mail sync | list | read | send | search`
- `nuncio folder list`
- `nuncio cal list | sync`
- `nuncio system status`
- **Pipeline & Scripting Support**: Accepts `--json` flag to stream machine-readable JSON payloads to stdout for processing with `jq`, `grep`, or automation pipelines. Global `--account <id>` flag allows targeting any specific account context.
### 5.2 Terminal UI Shell (`nuncio-tui`)
- **Rendering Engine**: `ratatui` v0.28+ with `crossterm` v0.28+.
- **HTML Email Strategy**: HTML email bodies are parsed with `html2text` and transformed into `ratatui::text::Text` structures. Links are assigned numeric footers (e.g. `o 1`) to trigger the OS default browser via `open::that`. Pressing `o` exports the message to an external browser or terminal pager (`w3m`).
### 5.3 Desktop GUI Shell (`nuncio-gui`)
- **Rendering Engine**: **Tauri v2** shell calling `nuncio-core` via IPC.
- **HTML Email Sandboxing**: Displays untrusted HTML emails inside isolated `<iframe sandbox="allow-same-origin" srcdoc="...">` tags with JavaScript execution disabled. Custom URI schemes (`nuncio-mail://`) proxy local attachments while blocking remote tracking pixels by default.
- **Accessibility & Native Integration**: Utilizes OS native browser accessibility engines (VoiceOver on macOS, NVDA/JAWS on Windows, Orca on Linux), OS system tray integration, and native notification APIs.
---
## 6. Testing, E2E & Protocol Mocking Standards
1. **100% Unit Test Line Coverage**: All engine domain logic, parsers, and recurrence algorithms require 100% line coverage (`cargo llvm-cov --workspace --fail-under-lines 100`).
2. **Integration Test Isolation**: Integration tests in `tests/` MUST use ephemeral databases (`tempfile` or `:memory:`) with zero state leakage.
3. **Headless E2E Test Suite**: E2E tests validate complete user workflows from `nuncio-cli` subcommands down through core engine streams and storage persistence.
4. **100% Offline Mocks for External Systems**:
- Network protocols (JMAP, IMAP, CalDAV, CardDAV, SMTP) are 100% mocked via `wiremock` and async mock traits.
- OS native vaults are mocked via `MockKeyring` in-memory provider.
- Live network connections during testing are strictly forbidden.
A current, accurate topology diagram will be added once the gRPC layer lands
(Phase 1). The previous `architecture.png` depicted the superseded socket/4-shell
model and was removed.
docs/Architecture-Specification.md
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# Systems Architecture & Topology Specification
Nuncio is engineered as a **Library-First, Daemon-Centered Sovereign Communication Suite** designed for high throughput, low latency (<3.2ms search), and strict domain isolation across all 10 workspace crates.
---
## 1. System Topology & Process Boundaries
![System Context Diagram](assets/c4_context.svg)
---
## 2. IPC Framing & Message Sequence Flow
Connected applications communicate with `nunciod` over local sockets using 4-byte Big-Endian length-prefixed JSON-RPC 2.0 frames:
![IPC Frame Sequence Flow](assets/ipc_sequence.svg)
---
## 3. Storage Architecture & Encryption Enclave
![Nuncio Architecture Topology](assets/topology.svg)
docs/BACKLOG.md
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# Backlog — Phase 0 & Phase 1 (engineering-ready)
Ordered, executable stories for the first two phases of [`ROADMAP.md`](ROADMAP.md).
Each story has acceptance criteria (AC) and a rough size (S ≤1d, M ≈2–4d, L ≈1wk).
Do them roughly top-to-bottom; within an epic, stories are mostly independent
unless noted. **Definition of done for every story:** engine + (where applicable)
proto + CLI + offline test, and `cargo verify` green.
---
## Phase 0 — Honesty & foundation
### Epic 0.A — Documentation reset
- **0.A.1 Archive fabricated docs** (S). Move the superseded `PLAN-*`, `TODO.md`,
`TICKET-*`, and `EXECUTIVE-*` files into `docs/_archive/` with a README stating
they are historical and unverified. **AC:** `docs/` top level contains only
`ROADMAP.md`, `BACKLOG.md`, `adr/`, a rewritten `ARCHITECTURE.md`, and `_archive/`.
- **0.A.2 Rewrite `CLAUDE.md` to reality** (M). Correct crate count (12), define
the cargo aliases (`check-all`, `test-all`, `cov`, `verify`), document the
gRPC/engine-first direction, and replace the "100% four-shell parity" mandate
with "parity via the published contract." **AC:** every command and claim in
`CLAUDE.md` is locally verifiable.
- **0.A.3 Rewrite `README.md`** (S). Remove fabricated claims and benchmarks;
state honest pre-alpha status. **AC:** no unverifiable claim remains.
### Epic 0.B — Release hygiene
- **0.B.1 Mark public releases pre-alpha** (S). Convert v1.0.0 and rolling
releases to prerelease with a NOTICE that they are non-functional and the
updater is unsafe. **AC:** no GitHub release is presented as GA.
- **0.B.2 Disable the fail-open auto-updater** (S). Guard the 24h update loop off
until Phase 4. **AC:** the daemon never downloads/replaces a binary.
### Epic 0.C — Green CI
- **0.C.1 Clear the clippy backlog** (M). Commit or revert the ~1,600 lines of
abandoned edits so `cargo check-all` passes (76 current denials in
`nuncio-core`). **AC:** `cargo check-all` exits 0 locally and in CI.
- **0.C.2 Align CI to the local gate** (S). CI runs `cargo clippy --workspace`
without `--all-targets`; make CI run `cargo check-all` so CI and local are
identical. **AC:** CI and `cargo verify` enforce the same lints.
- **0.C.3 Replace the coverage gate** (M). Drop the gamed 100%-line gate (it
excludes all `main.rs` and incentivized stub+matching-test theater) for a
realistic threshold on engine crates plus a **required** mock-server E2E job.
**AC:** coverage gate reflects real confidence; full CI green on `dev`/`main`.
### Epic 0.D — Shrink to engine + CLI
- **0.D.1 Extract the API-surface draft** (S, do before 0.D.2). Mine the MCP
shell's ~20 tool→engine mappings into `docs/api-surface-draft.md` as candidate
RPCs. **AC:** every operation the MCP shell exposed is listed as a candidate RPC.
- **0.D.2 Move UIs to `_reference/`** (M). Remove `nuncio-tui`, `nuncio-gui`
(+ `src-tauri`, `ui`), and `nuncio-mcp` from the workspace members into
`_reference/`. **AC:** workspace = `core, mail, cal, contacts, store, filter,
cli, nunciod`; `cargo build`/CI green.
### Epic 0.E — Kill hardcoded keys / real vault
- **0.E.1 Purge key literals** (M). Remove `DEFAULT_STORAGE_KEY`,
`DEFAULT_WORM_KEY`, `'secret_ledger_key'`, and `b'nuncio_ledger_secret'`; fail
closed when no key is present. **AC:** `grep` finds no crypto key literal in
`src/`; missing-key paths error rather than silently use a default.
- **0.E.2 Real OS keyring vault** (L). Replace `MockKeyring` in production with the
`keyring` crate; keys minted and read from the OS keyring; `MockKeyring` remains
test-only. **AC:** an integration test (with a mock keyring provider) proves the
daemon reads keys from the vault, not from source.
---
## Phase 1 — gRPC skeleton + the spine
### Epic 1.A — gRPC transport
- **1.A.1 Proto skeleton + build** (M). Create `proto/nuncio/v1` with a `Status`
RPC; wire tonic/prost codegen. **AC:** proto compiles; Rust server+client stubs
generate in the build.
- **1.A.2 Authenticated daemon server** (M). Daemon serves gRPC over loopback;
bearer token from the keyring; unauthenticated calls rejected. **AC:** an
unauthenticated `Status` call is refused; an authenticated one returns real
daemon state.
- **1.A.3 CLI becomes a gRPC client** (M). Rewrite `nuncio status` as a tonic
client; fence/retire the legacy JSON-RPC IPC. **AC:** `nuncio status`
round-trips daemon↔CLI over gRPC in an E2E test.
- **1.A.4 Events stream skeleton** (M). `Subscribe` server-streaming RPC emitting
`CoreEvent`s. **AC:** the CLI can subscribe and receive a test event; no
response/notification interleaving bug (regression test).
### Epic 1.B — Store correctness (prerequisite for real data)
- **1.B.1 FTS-vs-encryption strategy** (L). Decide and implement: index plaintext
before encryption, or drop body encryption for searchable fields — document the
choice. **AC:** body search returns real hits on the production store path
(not via raw-SQL plaintext injection); E2E proves it.
- **1.B.2 FTS backfill at migration** (M). Backfill the FTS index so messages
saved before first search are searchable. **AC:** a message saved before any
search call is found by a later search.
- **1.B.3 Fix salvage schema mismatch** (M). Recovery restores filter rules against
the real schema. **AC:** a recovery test restores a nonzero rule count.
- **1.B.4 Transient error ≠ corruption** (M). Distinguish `SQLITE_BUSY`/pool
timeouts from genuine corruption; never salvage/delete the live DB on a
transient error. **AC:** an injected transient error does not trigger
salvage/deletion; a genuinely corrupt DB still does.
### Epic 1.C — The spine (one account, real mail)
- **1.C.1 Persistent DB path** (M). Daemon opens a real store (e.g.
`~/.nuncio/…`); remove `HeadlessRunner::ephemeral()` from the CLI/production
path. **AC:** `account add` → restart daemon → `account list` shows the account.
- **1.C.2 Account setup + credentials** (M). Collect IMAP/SMTP config; store the
password in the keyring only. **AC:** account config persists; the password is
never written to SQLite or source; only a keyring reference is stored.
- **1.C.3 Real IMAP fetch → store loop** (L). Replace the status-flag "sync" with a
real fetch loop in the daemon using `ImapEngine`. **AC:** against a mock IMAP
server, messages land in the store and sync status reflects reality (no stuck
`Syncing`).
- **1.C.4 Read path over gRPC** (M). List folders/messages, read a body, mark
read — via CLI over gRPC. **AC:** offline E2E does list → read → mark-read
against the mock server.
- **1.C.5 Real SMTP send via outbox** (L). Delete the "Simulate remote IMAP/JMAP
mutation execution" worker; real send with retry/backoff. **AC:** against a mock
SMTP server a message actually sends; a failure retries; there is no fabricated
"Message sent" when it did not.
- **1.C.6 Mock protocol server harness** (M, enables 1.C.3–1.C.5 E2E). Stand up
offline mock IMAP/SMTP (and wiremock scaffolding for later JMAP/CalDAV). **AC:**
the full `fetch → store → read → send` E2E runs offline in CI.
**Phase 1 exit:** a real account syncs and sends end-to-end through the CLI over
gRPC, persisted across restarts, tested entirely offline, with CI green.
docs/Database-Corruption-Self-Healing.md
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# Database Corruption Detection & Self-Healing Engine
> **Status (2026-07-26):** the detection/backup/salvage machinery is real and
> tested, but has two known defects being fixed in [`BACKLOG.md`](BACKLOG.md)
> (Phase 1.B): transient errors (pool timeout / `SQLITE_BUSY`) are mis-classified
> as corruption and can delete a live DB, and rule salvage targets a wrong schema
> so filter rules are never restored. Treat as design intent pending those fixes.
Nuncio features a 4-Stage Database Corruption Recovery and Self-Healing Engine.
---
docs/EXECUTIVE-AUDIT-REVIEW.md
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# Nuncio Executive Architecture, Security & Code Audit Review
> **Authoritative Master Audit Report & Technical Scorecard**
> Developed by Master Orchestrator Agent and Subagent Audit Panel (Systems Architecture, Code Quality, Security, UI/UX & Performance).
> Target: All 9 Workspace Crates (`nuncio-core`, `nuncio-mail`, `nuncio-cal`, `nuncio-store`, `nuncio-cli`, `nuncio-tui`, `nuncio-gui`, `nuncio-mcp`, `nunciod`).
---
## Executive Audit Summary & Scorecard
```
MASTER AUDIT SCORECARD ACROSS 6 EVALUATION DIMENSIONS
1. Rust Standards & Quality Gates │ ████████████████████ 100% (Zero Warnings / Zero Lints)
2. Test Suite & Coverage │ ████████████████████ 100% (100/100 Passed across 9 Crates)
3. IPC Protocol & Frame Throughput │ ██████████████████░░ 95% (1.29 GB/s Throughput, <12.4ms)
4. Search Engine Performance │ ██████████████████░░ 95% (SQLite FTS5 Trigram <3.2ms)
5. Security Enclave & Isolation │ ████████████████░░░░ 85% (ZeroizeOnDrop, OS Keyring Vault)
6. Ergonomics & UI Input Latency │ ██████████████░░░░░░ 75% (Vim Motion Chords & Event Loop)
```
| Subsystem / Dimension | Score | Status | Key Audit Findings & Architectural Remediation |
| :--- | :---: | :---: | :--- |
| **Rust Standards & Quality Gates** | **100 / 100** | 🟢 FLAWLESS | Zero warnings, zero clippy lints, `#![forbid(unsafe_code)]` enforced across all headless engine crates, zero `.unwrap()` in production code. |
| **Test Suite & Coverage** | **100 / 100** | 🟢 FLAWLESS | 100 out of 100 tests passing cleanly across all 9 workspace crates (`nuncio-core`, `nuncio-mail`, `nuncio-cal`, `nuncio-store`, `nuncio-tui`, `nuncio-gui`, `nuncio-gui-tauri`, `nuncio-cli`, `nuncio-mcp`, `nunciod`). |
| **IPC Daemon Architecture** | **95 / 100** | 🟢 EXCELLENT | `IpcDaemonServer` and `IpcClient` provide 4-byte length-prefixed JSON-RPC 2.0 framing with <12.4ms latency for 16MB frame payloads. Auto-spawning retry loop verified. |
| **Search Engine Performance** | **95 / 100** | 🟢 EXCELLENT | SQLite FTS5 trigram search queries execute in <3.2ms across 100,000 indexed records. |
| **Security & Enclave Isolation** | **85 / 100** | 🟢 GOOD | Cryptographic memory hygiene via `ZeroizeOnDrop`, OS Keyring integration, age X25519 attachment streaming, and strict HTML `<iframe sandbox>` CSP enforcement (`default-src 'none'`). |
| **UI/UX & Keyboard Ergonomics** | **75 / 100** | ⚠️ POOR UX | Ratatui TUI input handling uses 100ms polling; requires async `crossterm::event::EventStream` with `tokio::select!` for <16ms frame target. Vim leader chords (`gg`, `gi`) require multi-key state machine. |
---
## Detailed Evaluation by Domain
### 1. Systems Architecture & Design (`nuncio-core`, `nunciod`, `nuncio-store`)
- **Ports & Adapters Model**: Domain models (`Email`, `Folder`, `CalendarEvent`, `Contact`, `AccountConfig`) in `nuncio-core` remain pure with zero third-party library leakage.
- **IPC Daemon Topology**: Centralized `nunciod` daemon manages `DatabaseEngine` WAL connection pool, `EventBus`, and `IpcDaemonServer`. `IpcClient` provides length-prefixed JSON-RPC 2.0 framing with 16MB ceiling guards.
- **Persistence Path Resolution**: `DatabaseEngine::connect_file` writes to user app data directory (`~/.nuncio/nuncio.sqlite`), while `DatabaseEngine::connect_ephemeral` uses `tempfile` for isolated integration test runs.
### 2. Code Quality & Standards (`nuncio-mail`, `nuncio-cal`, `nuncio-cli`)
- **Zero Warnings Gate**: Compiled with `-D warnings -F unsafe_code -D unused_must_use`. Zero compiler warnings and zero clippy lints across the workspace.
- **Error Handling Integrity**: Zero `.unwrap()` or `.expect()` calls exist in non-test production code. All errors map into strongly-typed `thiserror` enums (`ConfigError`, `EventBusError`, `MailError`, `CalendarError`, `DatabaseError`, `IpcClientError`).
### 3. Security & Cryptography (`nuncio-store`, `nuncio-gui`, `nuncio-mcp`)
- **Memory Hygiene**: Secrets encapsulated in `ZeroizeOnDrop` wrappers. OS Keyring credentials managed via `keyring` crate without plaintext disk exposure.
- **Data Protection at Rest**: Sensitive database columns encrypted via authenticated AES-256-GCM (`PayloadCipher`). Large binary attachments encrypted via `age` X25519 ciphers.
- **HTML Sandboxing**: Untrusted HTML emails rendered inside strict `<iframe sandbox="allow-same-origin">` enforcing CSP `default-src 'none'`. Remote image tracking pixels blocked by default.
- **MCP Safety Policies**: Action tools (`nuncio_mail_send`) execute over `IpcClient` under `Agent-Restricted` RBAC role with Human-in-the-Loop (HITL) prompt interception in GUI/TUI shells.
### 4. UI/UX & Rendering Latency (`nuncio-tui`, `nuncio-gui`, `nuncio-cli`)
- **IPC Throughput**: 4-byte length-prefixed frame transfer handles 16MB payloads in <12.4ms (~1.29 GB/s throughput).
- **SQLite FTS5 Query Speed**: Full-text trigram queries execute in <3.2ms across 100,000 indexed records.
- **GUI Visual Design**: Modern glassmorphic styling with CSS custom properties (`backdrop-filter: blur(20px)`), radial gradients, and dark mode palette.
---
## Actionable Remediation Roadmap
1. **Async TUI Event Stream**: Replace synchronous 100ms `crossterm` polling in `crates/nuncio-tui/src/main.rs` with asynchronous `crossterm::event::EventStream` and `tokio::select!` to achieve <16ms UI frame rendering.
2. **Vim Leader Chord State Machine**: Refactor single-key `'g'` handling in `crates/nuncio-tui/src/keybindings.rs` to support multi-key Vim chords (`gg` for top, `gi` for inbox, `gs` for sent).
3. **Dead Code Annotation Cleanup**: Remove unnecessary `#[allow(dead_code)]` suppressions in presentation shells by wiring up helper methods or adding active unit tests.
4. **GUI Light Mode CSS Tokens**: Extend `crates/nuncio-gui/ui/src/index.css` with light mode color tokens and `prefers-color-scheme` media query support.
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# Nuncio Executive Architectural, Engineering & Product Review
Nuncio ([nuncio.mx](https://nuncio.mx)) is a high-performance cross-platform mail and calendar client for macOS, Windows, and Linux. This document synthesizes the formal evaluations conducted by a **Senior Principal Software Engineer**, **Senior Enterprise Systems Architect**, and **Senior Technical Product Manager**.
---
## Executive Summary & Verdict
| Panelist | Verdict | Core Finding / Key Recommendation |
| :--- | :--- | :--- |
| **Senior Principal Software Engineer** | **Approved with Engineering Remediation** | Mandate bounded `mpsc(100)` channels, zero-copy `bytes::Bytes` in domain models, explicit SQLite pragmas (`WAL`, `synchronous=NORMAL`, `busy_timeout=5000`), finite `rrule` window limits, and `tempfile` for WAL integration testing. |
| **Senior Enterprise Systems Architect** | **Approved with Structural Refinements** | Enforce CSP headers on Tauri v2 HTML webviews to block tracking pixels, SQLCipher / WAL index encryption at rest, Argon2id file vault fallback for headless SSH sessions, and channel split (`watch` for state vs `mpsc`/`broadcast` for events). |
| **Senior Technical Product Manager** | **Approved with Milestone Calibration** | Decompose roadmap into 10 atomic micro-milestones (v0.1.1 to v1.0.0), define a unified `AccountConfig` schema in `nuncio-core`, and implement an offline transactional Outbox queue in `nuncio-store`. |
---
## 1. Domain Encapsulation & Memory Optimization
- **Zero Third-Party Library Leakage**: The Hexagonal Ports & Adapters Architecture successfully isolates `mail-parser`, `calcard`, `rrule`, `sqlx`, `keyring`, `age`, and `jmap-client` behind internal adapters (`MimeParserAdapter`, `IcalParserAdapter`, `SqliteStorageAdapter`). No third-party structs appear in `nuncio-core` signatures.
- **Zero-Copy Memory Preservation**: To prevent adapter mapping from invalidating `mail-parser` zero-copy SIMD performance, `nuncio_core::model::Email` will use `bytes::Bytes` for raw MIME payloads and `Arc<str>` for body strings across async task bounds.
---
## 2. Concurrency, Tokio Channels & State Management
- **Channel Split (State vs Events)**:
- `tokio::sync::watch` is lossy by design and MUST be used exclusively for continuous presentation state updates (`AppState`, `SyncStatus`, `FolderTree`).
- Discrete transactional events (`CoreEvent::MessageReceived`, `CoreEvent::AuthFailed`) MUST use `tokio::sync::broadcast` or bounded `mpsc` channels to prevent lost notifications.
- **Command Channel Backpressure**: All `CoreCommand` channels MUST be bounded (`mpsc::channel(100)`). The presentation layer must drop redundant UI input floods or throttle keyboard events.
---
## 3. Database Pragmas, FTS5 Search & Encrypted Storage
- **SQLite Connection Pragmas**: `nuncio-store` MUST configure `sqlx::sqlite::SqliteConnectOptions` upon pool creation with:
```sql
PRAGMA journal_mode = WAL;
PRAGMA synchronous = NORMAL;
PRAGMA busy_timeout = 5000;
PRAGMA foreign_keys = ON;
PRAGMA cache_size = -64000;
```
- **FTS5 Bulk Sync Optimization**: Initial sync of large mailboxes (50k+ emails) will bypass automatic FTS5 triggers, performing batch insertion into primary envelope tables first, followed by background batch indexing within single transactions.
- **Data-at-Rest Protection**: Disk encryption covers SQLite metadata files via SQLCipher / WAL encryption, sensitive tokens via `keyring`, and attachments via chunked `age` streaming ciphers.
- **Headless Secret Vault Fallback**: For headless Linux servers or SSH sessions where D-Bus SecretService is absent, `nuncio-store` provides an Argon2id + AES-256-GCM passphrase file vault fallback (`FileSecretVault`).
---
## 4. Security & Webview Sandboxing
- **HTML Email Privacy & Tracking Pixel Defense**:
- In `nuncio-gui` (Tauri v2), HTML email renders inside isolated `<iframe sandbox="allow-same-origin" srcdoc="...">` tags with JavaScript disabled.
- A strict Content Security Policy (`default-src 'none'; img-src nuncio-mail:; style-src 'unsafe-inline';`) blocks remote tracking pixels and external HTTP image beacons by default.
- Custom protocol scheme handlers (`nuncio-mail://`) proxy local attachments.
- **TUI URL Sanitization**: In `nuncio-tui`, opening URLs via `open::that` enforces strict scheme whitelisting (`http://`, `https://`, `mailto:`), blocking malicious local URI executions (`file://`, `javascript:`).
---
## 5. Testing, E2E & Protocol Mocking Strategy
- **100% Unit Test Line Coverage**: Enforced via `cargo-llvm-cov --workspace --fail-under-lines 100`. Crate roots include `#![deny(clippy::unwrap_used, clippy::expect_used)]`.
- **Integration Test Ephemeral Storage**: Integration tests in `tests/` MUST use `tempfile::tempdir()` rather than `:memory:`. SQLite `:memory:` connections isolate data per connection, whereas `tempfile` accurately tests multi-connection WAL mode behaviors.
- **100% Offline Protocol Mocking**:
- HTTP protocols (JMAP, CalDAV, CardDAV) are mocked using `wiremock`.
- TCP protocols (IMAP, SMTP) are mocked using `MockMailBackend` trait implementations and Tokio socket harnesses. Live network calls during testing are strictly forbidden.
---
## 6. Atomic Micro-Milestone Roadmap (v0.1.1 to v1.0.0)
| Milestone | Version Tag | Granular Focus | Primary Deliverable | Assigned Agent |
| :--- | :--- | :--- | :--- | :--- |
| **M1.1** | `v0.1.1` | Event Bus Channels | Bounded `mpsc(100)` command channel & `watch` state stream in `nuncio-core`. | `claude` |
| **M1.2** | `v0.1.2` | Config & Account Schema | `AccountConfig` Serde models & validation rules in `nuncio-core`. | `claude` |
| **M1.3** | `v0.1.3` | SQLite Engine & WAL | `sqlx` SQLite pool with WAL pragmas & migrations in `nuncio-store`. | `claude` |
| **M1.4** | `v0.1.4` | SQLite FTS5 Indexing | FTS5 virtual table schemas (`unicode61` + `trigram`) & triggers in `nuncio-store`. | `claude` |
| **M1.5** | `v0.1.5` | OS Vault Integration | `SecretManager` connecting to `keyring` with Argon2id file fallback. | `claude` |
| **M1.6** | `v0.1.6` | Attachment Encryption | `PayloadCipher` (AES-256-GCM) & chunked `age` streaming cipher in `nuncio-store`. | `claude` |
| **M2.1** | `v0.2.1` | Zero-Copy MIME Parser | `mail-parser` integration with `bytes::Bytes` buffer sharing in `nuncio-mail`. | `claude` |
| **M2.2** | `v0.2.2` | Outbound SMTP Transport | `lettre` async Tokio SMTP client with connection pooling in `nuncio-mail`. | `claude` |
| **M2.3** | `v0.2.3` | JMAP Protocol Client | `jmap-client` `Email/changes` single-roundtrip differential sync in `nuncio-mail`. | `claude` |
| **M2.4** | `v0.2.4` | IMAP Dual-Socket Manager | `async-imap` dual-connection manager (IDLE push stream + fetch pool) in `nuncio-mail`. | `claude` |
| **M2.5** | `v0.2.5` | Protocol Server Mocks | `wiremock` server mocks & `MockMailBackend` for offline integration tests. | `claude` |
| **M3.1** | `v0.3.1` | iCal/vCard to JSCalendar | `calcard` normalization converting `.ics` and `.vcf` to JSCalendar in `nuncio-cal`. | `claude` |
| **M3.2** | `v0.3.2` | Recurrence Expansion | `rrule` master pattern expansion & `EXDATE` filtering over finite window `[start, end]`. | `claude` |
| **M3.3** | `v0.3.3` | CalDAV REPORT Client | `reqwest` + `quick-xml` WebDAV `sync-collection` & `calendar-query` REPORT client. | `claude` |
| **M3.4** | `v0.3.4` | CalDAV Server Mocks | `wiremock` CalDAV server mocks for offline calendar tests. | `claude` |
| **M4.1** | `v0.4.1` | CLI Subcommand Parser | `clap` v4 subcommands (`mail`, `cal`, `sync`, `status`) in `nuncio-cli`. | `codex` |
| **M4.2** | `v0.4.2` | JSON Pipeline Formatting | `--json` output formatting and stdout streaming for Unix piping in `nuncio-cli`. | `codex` |
| **M4.3** | `v0.4.3` | Headless CLI E2E Tests | Headless E2E integration test suite executing CLI commands against mocked engine. | `codex` |
| **M5.1** | `v0.5.1` | TUI Layout & Navigation | `ratatui` + `crossterm` frame layouts, navigation state, and folder sidebar in `nuncio-tui`. | `agy-worker` |
| **M5.2** | `v0.5.2` | Mail Viewer & Composer | Mail thread list, message viewer, and composer screens in `nuncio-tui`. | `agy-worker` |
| **M5.3** | `v0.5.3` | HTML Email Text Renderer | `html2text` converter converting HTML email bodies into formatted text in `nuncio-tui`. | `agy-worker` |
| **M5.4** | `v0.5.4` | Calendar Grid Views | Day, week, and month calendar grid layouts in `nuncio-tui`. | `agy-worker` |
| **M6.1** | `v0.6.1` | Tauri v2 IPC Bridge | `Tauri v2` desktop GUI wrapper calling `nuncio-core` IPC commands in `nuncio-gui`. | `agy-worker` |
| **M6.2** | `v0.6.2` | Untrusted HTML Sandboxing | Isolated `<iframe sandbox>` tags with CSP headers & custom `nuncio-mail://` scheme. | `agy-worker` |
| **M6.3** | `v0.6.3` | Native OS Integrations | Native OS accessibility trees (VoiceOver, NVDA, Orca), system tray, notifications. | `agy-worker` |
| **M7.1** | `v0.7.1` | Full Workspace E2E Suite | Workspace-wide integration test suite with 100% unit test line coverage verification. | `agy` (Master) |
| **M7.2** | `v0.7.2` | Security & Memory Audit | Secret scanning, CSP header validation, and memory leak profiling. | `agy` (Master) |
| **M1.0** | `v1.0.0` | Production Release | GitHub Actions automated release pipeline (`.msi`, `.dmg`, `.AppImage`) & v1.0.0 binaries. | `agy` (Master) |
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# The Four Great Interfaces
Nuncio guarantees **100% Feature Parity** across four distinct, decoupled user interfaces:
![Four Great Interfaces Topology](assets/topology.svg)
---
## 1. Interface Capabilities Comparison Matrix
| Capability / Feature | POSIX CLI | Vim Ratatui TUI | Desktop GUI | Native MCP AI |
| :--- | :---: | :---: | :---: | :---: |
| **Mail Read / Send / Search** | `nuncio mail ...` | Full Vim Split View | Rich Media Inspector | `nuncio_mail_send` |
| **Calendar Event Booking** | `nuncio cal ...` | `AppMode::Calendar` | Interactive Calendar | `nuncio_cal_create_event` |
| **NSQL Filter Engine** | `nuncio filter ...` | `[s]` Editor + `[t]` Preview | Visual Rule Builder | `nuncio_filter_create` |
| **Daemon Telemetry** | `nuncio daemon top` | Status Header Bar | Telemetry Modal | `nuncio_daemon_status` |
| **Auto-Update Engine** | `nuncio self-update` | Header `[u]` Chord | `<UpdateBanner />` CTA | `nuncio_update_apply` |
---
## 2. Keyboard Motions & TUI Navigation Flow
- **Vim Motions**: `j` (down), `k` (up), `h` (left), `l` (right), `g i` (go inbox), `e` (archive), `s` (syntax editor), `f` (filter rules), `u` (update).
docs/Home.md
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# Nuncio Sovereign Mail & Calendar Suite — Official Wiki
# Nuncio Wiki
<p align="center">
<img src="assets/nuncio_app_icon.jpg" alt="Nuncio Application Icon" width="128" style="border-radius: 24px;" />
</p>
**A local-first mail, calendar, and contacts engine in Rust.**
<h3 align="center">A New Way to Do Email &amp; Calendars.</h3>
> **Status: pre-alpha, under active reconstruction (2026-07-26).** Nuncio began as
> an AI-generated proof of concept that a forensic assessment found to be largely
> non-functional, with substantially fabricated documentation. It is being rebuilt
> engine-first. Older wiki pages claiming completed features, benchmarks, or
> "100% parity" were removed. **Nothing here should be read as a shipped feature
> unless the roadmap says so.**
<p align="center">
<a href="https://nuncio.mx">Official Website: nuncio.mx</a> •
<a href="https://github.com/KofTwentyTwo/nuncio">GitHub Repository</a> •
<a href="https://github.com/KofTwentyTwo/nuncio/releases/tag/v1.0.0">Releases &amp; Downloads</a>
</p>
## Start here
---
- **[Roadmap](ROADMAP)** — the authoritative plan and target architecture.
- **[Backlog](BACKLOG)** — engineering-ready Phase 0 / Phase 1 stories.
- **[Architecture](ARCHITECTURE)** — technical architecture (target + current state).
- **[ADR 0001 — Engine-first gRPC architecture](adr/0001-engine-first-grpc-architecture)** — the governing decision.
## 1. Visual Application Overview
## Reference (real subsystems, with status caveats)
![Nuncio Desktop Application Preview](assets/nuncio_gui_hero.jpg)
- **[NSQL Filter Language](NSQL-Filter-Language-Specification)** — the declarative
filter language (parser/validator/engine are real; actions and scoping are being
finished in Phase 3).
- **[Database Self-Healing](Database-Corruption-Self-Healing)** — corruption
detection and recovery (real, with two defects being fixed in Phase 1).
---
## The short version
## 2. Four Great Interfaces & Central Daemon Architecture
Nuncio operates on a **Hybrid Daemon-First Architecture**. Centralized state management, SQLite WAL persistence, credential security enclaves, and protocol synchronizers reside inside a standalone background daemon (`nunciod`). Four decoupled interfaces communicate with `nunciod` over native IPC socket streams:
![Nuncio Suite Architecture Topology](assets/topology.svg)
---
## 3. Wiki Navigation Map
- **[Architecture Specification](Architecture-Specification)**: C4 topology, 4-byte IPC frame structure, SQLite WAL concurrency, and OS Keyring enclave security.
- **[Four Great Interfaces](Four-Great-Interfaces)**: In-depth usage guide for POSIX CLI, Vim Ratatui TUI, Desktop GUI, and Native MCP AI Agent interface.
- **[NSQL Filter Language Specification](NSQL-Filter-Language-Specification)**: Full NSQL compiler pipeline, AST node rules, `ON ACCOUNT` wildcard matching, and signed HTTP webhooks.
- **[Database Corruption & Self Healing](Database-Corruption-Self-Healing)**: Multi-stage corrupt DB detection, backup isolation, table salvage, and automatic remote resync.
- **[Multi Platform Release & Auto Update](Multi-Platform-Release-Auto-Update)**: GitHub Releases matrix, Homebrew tap installation, `.tar.gz`/`.zip`/`.dmg`/`.msi`/`.AppImage` packages, and SHA-256 self-updaters.
---
## 4. Quickstart Installation
```bash
# macOS & Linux via Homebrew
brew install koftwentytwo/tap/nuncio
# Cargo Package Manager
cargo install nuncio-cli nuncio-tui nuncio-mcp nunciod
# Direct One-Line Installer
curl -fsSL https://nuncio.mx/install.sh | sh
```
The daemon (`nunciod`) is the product: it owns all state, credentials, and
protocol logic, and publishes a versioned gRPC API over loopback. User interfaces
are separate native clients that consume that API. Parity across clients is a
property of the published contract, not a matter of discipline.
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# Multi-Platform Release & Auto-Update Engine
Nuncio features a cross-platform release build pipeline and atomic self-update engine.
---
## 1. Multi-Platform GitHub Actions Matrix
![Multi-Platform Matrix](assets/topology.svg)
---
## 2. Atomic Self-Update Sequence Flow
![Self-Update Sequence](assets/ipc_sequence.svg)
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# NSQL Filter Language & Webhook Specification
> **Status (2026-07-26):** describes the *intended* language. The parser,
> validator, and match engine are genuinely implemented and wired; however
> **actions do not yet execute**, `ON ACCOUNT` scoping is ignored, header
> conditions and non-ASCII rules have known bugs, and webhooks are unwired. Treat
> this as the design target, not current behavior. Corrections are tracked in
> [`ROADMAP.md`](ROADMAP.md) (Phase 3) and [`BACKLOG.md`](BACKLOG.md); reality is
> the 2026-07-26 assessment.
Nuncio SQL Filter Language (NSQL) is a declarative, high-throughput email routing and automation language powered by `sqlparser-rs`.
---
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# Nuncio Enhanced Production Roadmap (V1, V2, V3)
> **Authoritative Master Roadmap & Feature Specification**
> Developed by Master Orchestrator Agent and Senior PM Subagents (Mail, Calendar, Security & Platform).
> Benchmarked against Superhuman, Mimestream, Apple Mail, Outlook, HEY, Fastmail, ProtonMail, Cron / Notion Calendar, Fantastical, Thunderbird, Obsidian, Raycast, and YubiKey.
---
## Executive Summary & Commercial Benchmark Matrix
Nuncio is designed as a library-first, zero-mock, ultra-high-speed Mail, Calendar, and Contacts suite built in Rust with presentation shells for CLI, Ratatui TUI, and Tauri v2 Desktop GUI (React + Vite + TypeScript).
### Market Benchmark Matrix
| Feature / Subsystem | Superhuman / Mimestream | Fantastical / Cron | Thunderbird / Proton | Nuncio Target Architecture |
| :--- | :--- | :--- | :--- | :--- |
| **Transport Protocols** | Gmail API / IMAP / JMAP | CalDAV / WebDAV / Google | IMAP / OpenPGP / E2EE | Native Rust JMAP (RFC 8620/8621), IMAP4rev1 (QRESYNC/IDLE), SMTP, CalDAV (RFC 4791), CardDAV |
| **Keyboard Ergonomics** | Benchmark Vim / Cmd+K palette | Basic hotkeys / NLP | Standard legacy shortcuts | Vim motion navigation, Cmd+K fuzzy command palette, single-frame (<16ms) optimistic UI mutations |
| **Data Storage & Search** | Local cache / sub-50ms search | Local cache / Google search | Local SQLite DB / slow search | Local SQLite WAL + SQLCipher + Tantivy / FTS5 trigram search (<10ms across 100k messages) |
| **Security & Privacy** | Remote proxy image shield | Basic privacy | OpenPGP / Hardware tokens | OS Keyring + Argon2id fallback, OpenPGP (RFC 3156), S/MIME (RFC 8551), PKCS#11 YubiKey, strict HTML CSP iframe sandbox |
| **Extensibility & CLI** | Proprietary SaaS / No CLI | Proprietary / No CLI | Extension APIs / No CLI | Pure POSIX Noun + Verb CLI (`--json`), headless `nunciod` daemon, UNIX socket/Named Pipe IPC, QuickJS/Wasmtime plugins |
---
## Detailed Version Release Breakdown
```
┌──────────────────────────────────────────────────────────────────────────────────────────────────┐
│ RELEASE ROADMAP & MILESTONES │
├──────────────────────────────────┬────────────────────────────────┬──────────────────────────────┤
│ V1: GA LAUNCH │ V2: POWER USER & ENTERPRISE │ V3: PLATFORM & AI AUTO │
│ (Core Interoperability & MVP) │ (Scalability & Deep Work) │ (Autonomous Intelligence) │
├──────────────────────────────────┼────────────────────────────────┼──────────────────────────────┤
│ • Native IMAP / SMTP / CalDAV │ • JMAP RFC 8620/8621 Transport │ • Local LLM Thread Triage │
│ • Vim & Cmd+K Palette UX │ • Multi-Account Unified Inbox │ • Natural Language Scheduling│
│ • SQLite FTS5 / Tantivy Search │ • Cron-Style 1-on-1 Booking │ • WASM / QuickJS Plugins │
│ • Strict HTML iframe Sandbox │ • Multi-Timezone Timeline Grid │ • Cryptographic Webhooks │
│ • Pure POSIX CLI with --json │ • OpenPGP & S/MIME Encryption │ • Realtime Peer Mesh Sync │
│ • Tauri v2 Desktop & Ratatui TUI │ • Headless Daemon & IPC Bus │ • Enterprise Key Escrow │
└──────────────────────────────────┴────────────────────────────────┴──────────────────────────────┘
```
---
## Phase V1: GA Launch (Core Interoperability & Baseline Suite)
### 1. Mail & Transport Protocol Drivers (`nuncio-mail`)
- **IMAP4rev1 Engine (RFC 3501)**:
- TLS connection manager with `tokio-rustls` and WebPKI root certificates.
- RFC 2177 IDLE push notification listener loop.
- RFC 7162 QRESYNC differential synchronization using `HIGHESTMODSEQ`.
- RFC 6154 Special-Use folder discovery (`\Archive`, `\Drafts`, `\Sent`, `\Junk`, `\Trash`).
- **SMTP Transport Driver (RFC 5321)**:
- `lettre`-based transport engine supporting Implicit TLS (465) and STARTTLS (587).
- RFC 5322 MIME builder for text/plain, text/html, `multipart/alternative`, and `multipart/mixed` attachments.
- Transactional local Outbox queue with exponential backoff retries.
- **Authentication & Credentials**:
- OAuth2 PKCE Authorization Code Flow (RFC 7636) with local loopback callback server.
- OS Keyring integration via `keyring` crate with ZeroizeOnDrop memory wrappers.
### 2. Calendar & Scheduling Engine (`nuncio-cal`)
- **CalDAV Protocol Engine (RFC 4791)**:
- HTTP `calendar-query` and `calendar-multiget` WebDAV REPORT query builder using `quick-xml`.
- RFC 6578 `sync-collection` differential delta synchronization via `sync-token`.
- **iCalendar Recurrence Engine (RFC 5545)**:
- RRULE recurrence expansion engine supporting `FREQ`, `INTERVAL`, `BYDAY`, `BYMONTH`, `UNTIL`, `COUNT`.
- Bounded lazy window expansion preventing infinite recurrence loops.
- iTIP RSVP state machine (RFC 5546) parsing and emitting `REQUEST`, `REPLY`, `CANCEL`.
- **Grid Layout Algorithm**:
- Greedy interval coloring algorithm for overlapping event packing with connected component partitioning.
- 15-minute drag-and-drop snapping grid.
### 3. Data Storage, Search & Security (`nuncio-store`)
- **SQLite Engine**:
- SQLite WAL mode pragmas with connection pool.
- Column-level AES-256-GCM authenticated payload encryption.
- **Full-Text Search Engine**:
- FTS5 trigram indexing over email bodies, subjects, senders, and calendar event summaries with sub-10ms query performance.
- Structured query parser supporting `from:`, `to:`, `subject:`, `has:attachment`, `after:`, `before:`.
### 4. Presentation Shells (`nuncio-cli`, `nuncio-tui`, `nuncio-gui`)
- **CLI Shell (`nuncio-cli`)**:
- Pure POSIX Noun + Verb subcommands (`nuncio mail sync`, `nuncio account add`, `nuncio cal list`).
- `--json` machine-readable output format.
- Interactive password prompt via `rpassword` fallback.
- **Terminal TUI (`nuncio-tui`)**:
- Keyboard-first Ratatui 3-pane layout (Folders, Messages, Reader).
- Dynamic folder unread badges, message list unread flags (`*`), and HTML plain text reader view.
- Hotkey help modal, splash screen, and account settings view.
- **Desktop GUI (`nuncio-gui` / `nuncio-gui-tauri`)**:
- Native Tauri v2 desktop window wrapper.
- React 18 + Vite + TypeScript frontend with CSS custom properties and glassmorphic split-view layout.
- Strict HTML email iframe sandboxing (`sandbox=""`) enforcing CSP (`default-src 'none'`).
---
## Phase V2: Power User & Enterprise Tier
### 1. Advanced Protocol & Email Workflows
- **JMAP Protocol Engine (RFC 8620 Core / RFC 8621 Mail)**:
- Native JMAP client with SSE event streaming (`/jmap/event/`).
- Multi-method request batching and `Email/changes` state token delta sync.
- **Multi-Account Unified Inbox**:
- Unified mailbox view aggregating Inbox, Sent, Archive across Gmail, Fastmail, Outlook, and generic IMAP accounts.
- Per-account color badges and sender attribution.
- **HEY-Style Triage Engine**:
- "The Screener" queue isolating first-time senders for one-time Accept / Block decisions.
- Category Classifier sorting messages into *Primary*, *Feed (Newsletters)*, and *Paper Trail (Transactions)*.
- **Snooze & Send Later**:
- Deferred message handling with local background timers and scheduled outbox execution.
- **Custom Domain & DNS Validator**:
- Multi-identity `From:` selector with background SPF, DKIM, and DMARC alignment validation.
### 2. Advanced Calendar & Scheduling Features
- **Multi-Timezone Grid**:
- Dual and triple vertical timeline columns with dynamic OS location detection and DST transition indicators.
- **Complex Recurrence Overrides**:
- Detached instance override engine (`RECURRENCE-ID`) allowing single recurrence modifications without breaking series.
- **CardDAV & Contact Autocomplete**:
- VCard (RFC 6350) and CardDAV integration for attendee auto-complete and avatar rendering.
- **Cron-Style Embedded Booking Link Engine**:
- Self-hosted appointment scheduler with customizable duration choices, buffer rules, and auto-generated video call links.
- **System Menu Bar Popover**:
- Lightweight OS tray application featuring mini-calendar, upcoming meeting countdown, and global hotkeys (`Cmd+Shift+K`).
- **Calendar Sets & Privacy Blockouts**:
- Contextual calendar profile switching ("Work", "Personal", "Deep Work") and privacy-preserving auto-blocking of personal events as "Busy".
### 3. Enterprise Security & Developer Ergonomics
- **OpenPGP (RFC 3156) & S/MIME v4 (RFC 8551)**:
- End-to-end PGP and S/MIME message signing, verification, and encryption.
- Integration with local `gpg-agent` sockets and system X.509 certificate trust stores.
- **Hardware Security Key Integration**:
- PKCS#11 smartcard interface (`yubikey-pkcs11`) for hardware-isolated private keys.
- WebAuthn / FIDO2 passkey support for identity verification.
- **Headless Daemon & IPC Bus**:
- Detached background daemon (`nunciod`) with <50MB RAM footprint.
- UNIX Socket and Windows Named Pipe IPC bus streaming JSON-RPC 2.0 and SSE events.
- **Sandboxed Plugin Runtime**:
- QuickJS / Wasmtime sandboxed plugin engine with capability-based security permissions (`net:fetch`, `fs:read`).
- **Cryptographic Webhooks**:
- Outbound HTTP POST notifications signed with HMAC-SHA256 (`X-Nuncio-Signature-256`) and dead-letter retry queues.
---
## Phase V3: Platform & AI Automation Tier
### 1. Privacy-Preserving Local AI Engine
- **On-Device LLM Summarization**:
- Embedded small language model (via `llama.cpp` bindings) generating zero-privacy-leak thread summaries and action item extractions.
- **Smart Natural Language Scheduling Bot**:
- Conversational AI parsing natural language scheduling prompts to find mutual availability slots and draft meeting invites automatically.
- **Smart Slot Recommendation Engine**:
- Machine learning model analyzing historical meeting patterns, energy levels, and focus time rules to recommend optimal meeting times.
### 2. Advanced Platform & Ecosystem Features
- **Dynamic Transit Buffer Calculator**:
- Integration with mapping services to automatically calculate travel buffers and insert transit events before in-person meetings.
- **Automated Document & Context Indexing**:
- Automatic linking of relevant documents, notes, email threads, and previous meeting notes based on attendee graph analysis.
- **Multi-Tenant Enterprise Key Escrow**:
- Enterprise cryptographic key escrow framework supporting administrative compliance recovery policies and HSM attestation.
- **Real-Time Peer State Synchronization Mesh**:
- Peer-to-peer end-to-end encrypted event mesh synchronizing state instantly across desktop, mobile, and CLI instances.
---
## Summary Metric & Delivery Matrix
| Phase | Milestone Target | Key Quality & Performance Metric |
| :--- | :--- | :--- |
| **V1** | GA Launch Baseline | 100% Rust workspace test coverage, <16ms TUI/GUI single-frame response, <10ms local search queries. |
| **V2** | Power User & Enterprise | Sub-50MB daemon RAM idle, full OpenPGP/S/MIME compliance, unified multi-account inbox aggregation. |
| **V3** | Platform & AI Automation | 100% on-device local LLM execution, zero-knowledge peer mesh sync, WASM plugin capability isolation. |
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# Nuncio Hybrid Daemon-First Architecture Blueprint (`nunciod` + IPC)
> **Master Architecture & Code Refactoring Specification**
> Developed by Master Orchestrator Agent and Subagent Panel (Systems & IPC, Security, Software Architecture).
---
## Executive Overview & System Topology
Nuncio uses a **Hybrid Daemon-First Architecture**, where a single background process (`nunciod`) acts as the single source of truth for storage, network protocols (IMAP, SMTP, CalDAV), credential enclaves, and core state management. All four presentation shells (**CLI**, **TUI**, **GUI**, and **MCP LLM Interface**) communicate with `nunciod` via low-latency native OS IPC transports.
```
┌────────────────────────────────────────────────────────────────────────────────────────┐
│ Presentation Shells │
│ │
│ ┌──────────────┐ ┌──────────────┐ ┌───────────────────┐ ┌────────────────────┐ │
│ │ nuncio-cli │ │ nuncio-tui │ │nuncio-gui(Tauri v2│ │ nuncio-mcp │ │
│ │ (POSIX CLI) │ │ (Ratatui) │ │ Desktop GUI) │ │ (MCP AI Interface) │ │
│ └──────┬───────┘ └──────┬───────┘ └─────────┬─────────┘ └─────────┬──────────┘ │
│ │ │ │ │ │
│ └──────────────────┴──────────┬──────────┴───────────────────────┘ │
│ │ │
│ IpcClient │
│ (Auto-Spawn + Retry Loop + JSON-RPC) │
└───────────────────────────────────────┼────────────────────────────────────────────────┘
│
┌────────────────────────────┴────────────────────────────┐
│ POSIX: UNIX Domain Socket (`~/.nuncio/nuncio.sock`) │
│ Windows: Named Pipe (`\\.\pipe\nuncio-ipc`) │
└────────────────────────────┬────────────────────────────┘
│
┌───────────────────────────────────────┼────────────────────────────────────────────────┐
│ ▼ │
│ IpcDaemonServer │
│ (Security Enclave) │
│ │
│ nunciod Daemon │
│ ┌──────────────────────────────────────────────────────────────────────────────────┐ │
│ │ nuncio-core │ │
│ │ EventBus (mpsc command_tx | watch state_tx | broadcast event_tx) │ │
│ └──────────────┬──────────────────────────┬──────────────────────────┬─────────────┘ │
│ │ │ │ │
│ ▼ ▼ ▼ │
│ ┌──────────────────────────┐┌──────────────────────────┐┌──────────────────────────┐ │
│ │ nuncio-mail ││ nuncio-cal ││ nuncio-store │ │
│ │ JMAP / IMAP / SMTP ││ CalDAV / iCal ││ SQLite FTS5 / Age │ │
│ └──────────────────────────┘└──────────────────────────┘└──────────────────────────┘ │
└────────────────────────────────────────────────────────────────────────────────────────┘
```
---
## 1. Native Socket Transport & Security Specification
### 1.1 OS Socket Transports
- **Linux & macOS**: UNIX Domain Socket (`~/.nuncio/nuncio.sock`) created with mode `0600`. Peer credentials validated at kernel level (`SO_PEERCRED` on Linux, `LOCAL_PEERCRED` on macOS) matching caller UID against `nunciod` process UID.
- **Windows**: Named Pipe (`\\.\pipe\nuncio-ipc`) with Discretionary ACLs restricting access exclusively to the active Windows User SID (`TokenUser`).
- **Loopback TCP Fallback (`127.0.0.1:9422`)**: Restricted to containerized environments, secured by a 256-bit cryptographically random bearer token (`~/.nuncio/.ipc_bearer_token`) verified via constant-time comparison (`subtle::ConstantTimeEq`).
### 1.2 Framing & Wire Protocol
- **Binary Framing Header**: 4-byte Big-Endian length prefix (`u32::to_be_bytes()`) with strict 16MB frame ceiling.
- **Protocol Format**: JSON-RPC 2.0 request, response, and server notification payloads (`system.ping`, `system.state`, `mail.sync_all`, `events.notify`).
---
## 2. Auto-Spawning & Daemon Lifecycle
1. **Absence Detection**: `IpcClient::connect_or_spawn()` attempts connecting to native IPC socket. If socket connection fails, absence is confirmed.
2. **Background Detachment**: Shell executes `nunciod` binary as a detached process (`setsid()` on POSIX, `CREATE_NO_WINDOW` on Windows) with stdio streams redirected to `NUL` or `nunciod.log`.
3. **Exponential Backoff Retry Loop**: Shell retries socket connection over 5 attempts (50ms $\rightarrow$ 100ms $\rightarrow$ 200ms $\rightarrow$ 400ms $\rightarrow$ 800ms).
4. **PID File Lock**: `nunciod` acquires an advisory lock on `~/.nuncio/nunciod.pid`. Graceful shutdown via `SIGTERM` flushes SQLite WAL buffers and cleans up PID/socket files.
---
## 3. Shell Refactoring Architecture
- **`nuncio-cli`**: Routes commands via `IpcClient`. If daemon is offline, falls back to direct SQLite `DatabaseEngine` reads.
- **`nuncio-tui`**: Connects `Ratatui` event loop to `IpcClient::subscribe_events()`, rendering real-time push updates alongside crossterm input events.
- **`nuncio-gui`**: Tauri v2 `IpcBridge` handles window commands via `IpcClient` and emits `core-event` payloads to the React frontend.
- **`nuncio-mcp`**: Tools execute queries directly against FTS5 search index and route actions (`nuncio_mail_send`) to `IpcClient` with Human-in-the-Loop (HITL) prompt enforcement.
---
## 4. Credential Enclave & Security Policy
1. **Enclave Isolation**: OS Keyring passwords, OAuth refresh tokens, and `age` private keys stay **100% inside `nunciod` heap memory**. Presentation shells never handle plaintext secrets.
2. **Heap Memory Hygiene**: Secret structures implement `ZeroizeOnDrop` with OS memory page locking (`libc::mlock` / `VirtualLock`).
3. **MCP Tool Safety & HITL Interception**: External LLM tools (`nuncio_mail_send`) operate under `Agent-Restricted` RBAC role. Outbound emails trigger a Human-in-the-Loop approval prompt in GUI/TUI before SMTP transmission. Append-only audit logging is maintained at `~/.nuncio/audit.log`.
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# Nuncio Multi-Shell Parity & V1-V3 Strategic Execution Plan
> **Master Engineering Execution Strategy & Standing Rule Enforcement**
> **Author**: Master Orchestrator Agent (`agy`)
> **Repository**: [KofTwentyTwo/nuncio](https://github.com/KofTwentyTwo/nuncio)
---
## 1. Standing Rule: 100% Multi-Shell Feature Parity Equivalence
It is a binding architectural constraint that **all four presentation shells MUST maintain 100% feature parity with each other**:
1. **`nuncio-cli` (POSIX CLI)**: Every domain action MUST have a pure `<Noun> <Verb>` CLI subcommand outputting deterministic JSON envelopes (`--json`) for scriptability.
2. **`nuncio-tui` (Terminal TUI)**: Every domain action MUST have a single-key / leader-key Vim shortcut (`keybindings.rs`) and a Ratatui interactive modal/panel.
3. **`nuncio-gui` (Tauri v2 Desktop GUI)**: Every domain action MUST have a visual React component (`App.tsx`, `Sidebar`, `MessageList`, `Reader`) and command palette entry (`Cmd+K`).
4. **`nuncio-mcp` (Native LLM Agent UI)**: Every domain action MUST have an exposed MCP JSON-RPC 2.0 tool (`tools.rs`), resource URI resolver (`resources.rs`), and prompt template (`prompts.rs`).
```
┌────────────────────────────────────────────────────────────────────────────────────────┐
│ 100% MULTI-SHELL FEATURE PARITY RULE │
│ │
│ New Feature Request / Domain Capability (Mail, Calendar, Security, AI) │
│ │ │
│ ┌───────────────────┬───────────────┴───────────────┬───────────────────┐ │
│ ▼ ▼ ▼ ▼ │
│ ┌───────────┐ ┌───────────┐ ┌───────────┐ ┌───────────┐ │
│ │nuncio-cli │ │nuncio-tui │ │nuncio-gui │ │nuncio-mcp │ │
│ │(Noun+Verb)│ │ (Ratatui) │ │(Tauri v2) │ │ (MCP Stdio│ │
│ └─────┬─────┘ └─────┬─────┘ └─────┬─────┘ └─────┬─────┘ │
│ │ │ │ │ │
│ └───────────────────┴───────────────┬───────────────┴───────────────────┘ │
│ │ │
│ ▼ │
│ IpcClient / IpcDaemonServer │
│ (Central nunciod) │
└────────────────────────────────────────────────────────────────────────────────────────┘
```
---
## 2. Phase Execution Matrix (V1 $\rightarrow$ V2 $\rightarrow$ V3)
### Phase 1: V1 GA Launch & Polish (Immediate Execution)
- **Goal**: Complete 100% feature parity across all 4 UIs for core Mail & Calendar operations (`sync`, `list`, `read`, `search`, `send`, `event_create`, `account_manage`).
- **Milestones**:
- `v0.8.0` (Hybrid Daemon Integration): Complete IPC client wiring for TUI and GUI shells over `nunciod`.
- `v0.9.0` (UX & Performance Polish): Implement TUI async `crossterm::event::EventStream` with `tokio::select!` for sub-16ms frame target. Implement Vim leader chord state machine (`gg`, `gi`, `gs`).
- `v1.0.0` (GA Release): Cross-platform installer packaging (`.msi`, `.dmg`, `.AppImage`), zero warnings, and 100% unit test coverage gate.
### Phase 2: V2 Power User & Enterprise Capabilities
- **Goal**: JMAP transport, OAuth2 PKCE token rotation, CardDAV contact sync, OpenPGP / S/MIME, multi-timezone calendar overlays, 1-on-1 scheduling links, meeting link auto-detection.
- **UI Parity Rollout**:
- `nuncio-cli`: `nuncio jmap sync`, `nuncio auth oauth`, `nuncio contact list`, `nuncio cal schedule-link`.
- `nuncio-tui`: Contactpicker overlay, multi-timezone column toggle (`t`), GPG key manager modal (`K`).
- `nuncio-gui`: React CardDAV contact sidebar, timezone timeline resizer, video meeting join button.
- `nuncio-mcp`: `nuncio_jmap_sync`, `nuncio_contact_search`, `nuncio_cal_create_schedule_link`.
### Phase 3: V3 Platform & AI Automation
- **Goal**: Local LLM agent auto-categorization & triage, automated meeting summaries, Lua/WASM plugin runtime, webhook workflow engine, age encrypted cloud sync relay.
- **UI Parity Rollout**:
- `nuncio-cli`: `nuncio ai categorize`, `nuncio ai summarize --id msg_123`, `nuncio plugin load --path plugin.wasm`.
- `nuncio-tui`: AI Triage pane (`A`), Meeting summary drawer (`M`), Plugin status monitor (`P`).
- `nuncio-gui`: React AI smart categories (`Important`, `Paper Trail`, `Feed`), WASM plugin settings modal.
- `nuncio-mcp`: `nuncio_ai_triage_inbox`, `nuncio_ai_summarize_thread`, `nuncio_plugin_execute`.
---
## 3. Subagent Execution Assignment Table
| Subagent Role | Primary Crate Assignments | Key Responsibilities |
| :--- | :--- | :--- |
| **Master Orchestrator (`agy`)** | Workspace root, `docs/` | High-level roadmap tracking, atomic milestone assignment, GitHub Project Board synchronization, quality gate checks. |
| **Protocol & Core Engineer (`claude`)** | `nuncio-core`, `nuncio-mail`, `nuncio-cal`, `nuncio-store` | JMAP HTTP RFC 8620/8621, IMAP/SMTP transport, CalDAV/CardDAV engine, SQLite FTS5 trigrams, `age` ciphers, 100% test coverage. |
| **CLI & Automation Engineer (`codex`)** | `nuncio-cli` | Noun + Verb CLI command parsing, `--json` envelope schemas, Unix pipe streaming, scripting automation. |
| **UI & Presentation Engineer (`agy-worker`)** | `nuncio-tui`, `nuncio-gui`, `nuncio-mcp` | Ratatui TUI event loop (<16ms target), Vim motion state machine, Tauri v2 React frontend, MCP JSON-RPC stdio server. |
| **Security Engineer (`security_auditor`)** | `nuncio-store`, `nunciod` | Credential memory hygiene (`ZeroizeOnDrop`), OS Keyring integration, socket peer authorization (`SO_PEERCRED`), HTML iframe CSP sandboxing, MCP HITL safety prompts. |
---
## 4. Continuous Quality Gate Enforcement
1. **Compiler Gate**: `cargo check --workspace` MUST return **0 warnings** (`-D warnings`).
2. **Clippy Gate**: `cargo clippy --workspace -- -D warnings` MUST return **0 lints**.
3. **Test Suite Gate**: `cargo test --workspace` MUST pass **100% of tests** across all 9 crates.
4. **Safety Gate**: Zero `.unwrap()` or `.expect()` calls allowed in production non-test code.
5. **Parity Gate**: Every PR adding a feature must update all 4 presentation crates (`cli`, `tui`, `gui`, `mcp`).
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# PLAN: Nuncio Multi-Agent Implementation Strategy
## Goal
Build Nuncio ([nuncio.mx](https://nuncio.mx)), a high performance cross-platform mail and calendar application in Rust, using a library-first architecture with skinny shells for CLI, TUI, and GUI across Windows, macOS, and Linux.
## Multi-Agent Execution Strategy
Antigravity (`agy`) operates as the **Master Orchestrator Agent**, managing high-level task decomposition, roadmap tracking, multi-agent dispatching, quality gate validation (`cargo verify`, `cargo cov`), git branch workflows, and wiki documentation.
Subagents are assigned specialized domain responsibilities based on their model strengths:
```
┌────────────────────────────────────────────────────────────────────────┐
│ Antigravity Master Agent (agy) │
│ Roadmap Management, Subagent Dispatching, Quality Verification │
└────────┬──────────────────────┬───────────────────────┬────────────────┘
│ │ │
▼ ▼ ▼
┌──────────────────┐ ┌──────────────────┐ ┌──────────────────┐
│ Claude Code │ │ OpenAI Codex │ │Antigravity Worker│
│ Engine & Domain │ │ CLI & Automation│ │ TUI & GUI Shells│
└──────────────────┘ └──────────────────┘ └──────────────────┘
```
### Subagent Role Breakdown
1. **Claude Code Subagent (`claude`)**:
- **Assigned Domain**: Headless engine crates (`crates/nuncio-core`, `crates/nuncio-mail`, `crates/nuncio-cal`, `crates/nuncio-store`).
- **Key Tasks**: `sqlx` SQLite WAL migrations, FTS5 trigram triggers, `mail-parser` zero-copy MIME parsing, `jmap-client` WebSocket streams, `async-imap` dual-socket manager, `calcard` JSCalendar conversions, `rrule` recurrence algorithms, `age` blob encryption, and 100% unit test line coverage enforcement.
2. **OpenAI Codex Subagent (`codex`)**:
- **Assigned Domain**: CLI tool & pipeline automation (`crates/nuncio-cli`).
- **Key Tasks**: `clap` v4 subcommand derive parsers (`nuncio mail list|read|send`, `nuncio cal list|add`), JSON output formatters (`--json`), shell autocomplete generation, and automated data generator scripts.
3. **Antigravity Worker Subagent (`agy`)**:
- **Assigned Domain**: Presentation shells & CI/CD packaging (`crates/nuncio-tui`, `crates/nuncio-gui`).
- **Key Tasks**: `ratatui` + `crossterm` TUI screen layouts, `html2text` hyperlink text formatting, `Tauri v2` desktop GUI shell wrapper, native OS webview sandboxing (`nuncio-mail://` scheme), and GitHub Actions cross-platform matrix build pipelines.
---
## High Level Roadmap Phases & Assigned Subagent
### Phase 1: Engine Foundation & Storage
- `nuncio-core` workspace engine setup & Tokio event loop -> **Claude Code Subagent**
- `nuncio-store` SQLite WAL schema & FTS5 trigram indexes -> **Claude Code Subagent**
- `keyring` OS vault integration & `age` payload encryption -> **Claude Code Subagent**
- Unit test suite with 100% line coverage gate -> **Claude Code Subagent**
### Phase 2: Mail & Calendar Protocol Engine Libraries
- `nuncio-mail` `mail-parser`, `jmap-client`, `async-imap`, `lettre` -> **Claude Code Subagent**
- `nuncio-cal` `calcard`, `rrule`, `reqwest` CalDAV REPORT queries -> **Claude Code Subagent**
- Protocol mocks (`wiremock`, `MockMailBackend`, `MockKeyring`) -> **Claude Code Subagent**
### Phase 3: Command Line & Terminal User Interfaces
- `nuncio-cli` subcommands (`mail`, `cal`, `sync`, `status`) & JSON pipes -> **OpenAI Codex Subagent**
- `nuncio-tui` Ratatui layout, composer, and `html2text` renderer -> **Antigravity Worker Subagent**
### Phase 4: Desktop GUI Shell & Cross-Platform Packaging
- `nuncio-gui` Tauri v2 wrapper calling `nuncio-core` IPC -> **Antigravity Worker Subagent**
- Untrusted HTML email iframe sandboxing & CSP headers -> **Antigravity Worker Subagent**
- GitHub Actions cross-platform release pipeline -> **Antigravity Master Agent (agy)**
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# Nuncio Production Readiness Roadmap (Zero-Mock Architecture)
> **Goal:** Transition Nuncio from stubbed/mocked interfaces to a 100% real, human, production-ready cross-platform mail & calendar client suite with ZERO mocked data or stubbed network calls.
---
## Roadmap Overview & Epic Matrix
| Epic ID | Domain / Scope | Issue Range | Key Target Deliverable |
| :--- | :--- | :---: | :--- |
| **Epic 1** | **Real Protocol Drivers & Live Sync** | `#101 - #125` | Live IMAP (IDLE/Sync), SMTP (TLS Send), JMAP (RFC 8620/8621), CalDAV (RFC 4791). |
| **Epic 2** | **Storage & Data-at-Rest Security** | `#126 - #145` | SQLite WAL migrations, per-account PBKDF2 vault key derivation, FTS5 trigrams. |
| **Epic 3** | **TUI Interactive Terminal App** | `#146 - #170` | Live DB state binding, scrollable reader, compose/reply text modal, folder tree. |
| **Epic 4** | **Native Desktop GUI (Tauri v2 + React)** | `#171 - #200` | Windows/macOS/Linux desktop app, React frontend, sandboxed HTML iframe. |
| **Epic 5** | **CLI Live Pipeline & Interactive Inputs** | `#201 - #220` | Interactive non-echoing prompts (`rpassword`), background daemon sync, Unix piping. |
| **Epic 6** | **Live E2E System Test Matrix** | `#221 - #240` | Dockerized Dovecot/Postfix/Radicale test harnesses with zero mock servers. |
| **Epic 7** | **Packaging, Installers & CI/CD** | `#241 - #260` | Windows MSI/EXE, macOS DMG with codesigning, Linux AppImage/DEB/RPM. |
---
## Epic 1: Real Protocol Drivers & Live Sync Engine (#101 – #125)
- **#101**: Implement live IMAP connection pool with tls handshake via `async-imap` & `tokio-rustls`.
- **#102**: Implement IMAP IDLE push notification listener loop for real-time inbox updates.
- **#103**: Implement incremental IMAP UID FETCH message sync algorithm storing flags in SQLite.
- **#104**: Implement IMAP mailbox list parser mapping RFC 3501 hierarchy to domain `Folder` entities.
- **#105**: Implement IMAP draft, sent, trash, and flag state mutations (`STORE +FLAGS`, `COPY`, `EXPUNGE`).
- **#106**: Implement live SMTP transport client using `lettre` with STARTTLS and Implicit TLS support.
- **#107**: Implement MIME message builder for multipart/alternative (plain text + HTML + attachments).
- **#108**: Implement live SMTP delivery confirmation and queue retry mechanism with backoff.
- **#109**: Implement JMAP Session resource discovery (`/.well-known/jmap`) and API token authentication.
- **#110**: Implement JMAP `Email/get` and `Email/changes` push synchronization engine.
- **#111**: Implement JMAP `Email/set` for creation, updates, and destruction of messages.
- **#112**: Implement CalDAV WebDAV report query builder for time-range event filtering (`RFC 4791`).
- **#113**: Implement CalDAV multi-status XML parser extracting `VEVENT` data using `quick-xml`.
- **#114**: Implement CalDAV `PUT` / `DELETE` methods for creating and modifying calendar events.
- **#115**: Implement RFC 5545 iCalendar recurrence engine expansion using `rrule` crate.
- **#116**: Implement CardDAV VCard parsing and sync for contacts (`RFC 6350`).
- **#117**: Implement connection fallback strategy (Implicit TLS 465/993 -> STARTTLS 587/143).
- **#118**: Implement self-signed SSL/TLS certificate handling and custom CA trust store options.
- **#119**: Implement network error recovery and automatic reconnect loops for dropped sockets.
- **#120**: Implement protocol metrics collector tracking sync duration, byte throughput, and error rates.
- **#121**: Implement MIME attachment stream downloader saving raw bytes to local disk cache.
- **#122**: Implement JMAP `Mailbox/query` for custom user-created mailbox folders.
- **#123**: Implement OAuth2 authentication flow support for Gmail and Office365 endpoints.
- **#124**: Implement JMAP event source push engine (`/eventsource`) for real-time updates.
- **#125**: Implement live protocol unit and integration verification against external test accounts.
---
## Epic 2: Storage & Data-at-Rest Security (#126 – #145)
- **#126**: Implement SQLite WAL journal mode pragmas and connection pool manager in `nuncio-store`.
- **#127**: Implement PBKDF2/Argon2id key derivation module mapping OS vault secrets to AES keys.
- **#128**: Implement transparent column-level message body encryption/decryption in SQLite queries.
- **#129**: Implement `ZeroizeOnDrop` credential memory hygiene for all account configuration fields.
- **#130**: Implement SQLite FTS5 full-text search index setup with trigram tokenizer for email bodies.
- **#131**: Implement FTS5 query builder with prefix search and quote escaping.
- **#132**: Implement automated database migration runner (`sqlx::migrate!`) for schema versioning.
- **#133**: Implement local file attachment stream encryption using `age` X25519 passphrases.
- **#134**: Implement account isolation model enforcing single-tenant table scoping or multi-db files.
- **#135**: Implement database compaction and VACUUM routine scheduled periodically.
- **#136**: Implement `SecretManager` keyring integration for Windows Credential Manager, macOS Keychain, and Linux Secret Service.
- **#137**: Implement secret key rotation mechanism re-encrypting message bodies when key changes.
- **#138**: Implement local database corruption recovery and backup snapshot creation.
- **#139**: Implement message thread / conversation grouping queries in SQLite.
- **#140**: Implement contact autocomplete index in SQLite FTS5.
- **#141**: Implement calendar event cache storing recurrence instances in SQLite.
- **#142**: Implement attachment cache eviction policy (LRU cap at 1GB).
- **#143**: Implement database error mapping into domain `DatabaseError` variants.
- **#144**: Implement ephemeral database test helper for isolation during integration tests.
- **#145**: Implement SQLite index tuning and query plan verification for sub-10ms response times.
---
## Epic 3: TUI Interactive Terminal App (#146 – #170)
- **#146**: Connect `TuiApp` to live `DatabaseEngine` and `EventBus` channels.
- **#147**: Implement live dynamic folder list rendering from SQLite in TUI Sidebar.
- **#148**: Implement live message list rendering for selected folder with unread indicators.
- **#149**: Implement dynamic email reader view rendering plain text body from SQLite.
- **#150**: Implement HTML-to-terminal text renderer using `select.rs` / custom parser for HTML emails.
- **#151**: Implement scrollable reader pane supporting Page Up / Page Down / Vim motions.
- **#152**: Implement interactive compose email modal with multi-line text input fields.
- **#153**: Implement interactive reply / reply-all modal populating subject and recipient headers.
- **#154**: Implement account switcher overlay listing all configured accounts with selection status.
- **#155**: Implement interactive account creation form modal with validation rules.
- **#156**: Implement interactive Help menu modal (`?` / `h`) dynamically listing active keybindings.
- **#157**: Implement status bar showing background sync progress spinner and error alerts.
- **#158**: Implement search modal (`/`) filtering message lists via SQLite FTS5 in real time.
- **#159**: Implement message action keybindings (Delete `d`, Archive `e`, Mark Read `m`, Flag `*`).
- **#160**: Implement terminal resize listener adjusting ratatui layouts dynamically.
- **#161**: Implement splash screen view (`p`) displaying logo and version branding.
- **#162**: Implement color theme engine supporting Dark, Light, High Contrast, and Matrix themes.
- **#163**: Implement attachment selector view allowing terminal users to save attachments.
- **#164**: Implement confirmation dialog modal for destructive actions (e.g. permanent delete).
- **#165**: Implement calendar view pane in TUI rendering monthly/weekly grid with events.
- **#166**: Implement contact list view pane in TUI with search and detail inspection.
- **#167**: Implement mouse click and scroll wheel support for ratatui panes.
- **#168**: Implement custom keybinding configuration parser loading from `~/.config/nuncio/keys.toml`.
- **#169**: Implement terminal raw mode safety guards restoring terminal state on exit or panic.
- **#170**: Implement full E2E interactive TUI session tests using `ratatui::backend::TestBackend`.
---
## Epic 4: Native Desktop GUI (Tauri v2 + React/Vite) (#171 – #200)
- **#171**: Initialize Tauri v2 application framework structure in `crates/nuncio-gui/src-tauri`.
- **#172**: Initialize React + Vite + TypeScript frontend project structure in `crates/nuncio-gui/ui`.
- **#173**: Configure native window windowing rules (title bar, minimum dimensions 1024x768).
- **#174**: Implement Tauri v2 IPC commands (`#[tauri::command]`) linking React to `IpcBridge`.
- **#175**: Implement React split-view layout component (Sidebar, MessageList, Reader).
- **#176**: Implement Sandboxed HTML email iframe renderer component with strict CSP.
- **#177**: Implement custom `nuncio-mail://` protocol handler in Tauri v2 for secure attachment loading.
- **#178**: Implement tracking pixel defense blocking remote image loading by default with toggle button.
- **#179**: Implement dark mode / light mode theme toggle with CSS system preference auto-detection.
- **#180**: Implement rich text email composer with HTML editor and attachment drag-and-drop.
- **#181**: Implement account manager settings modal for adding/editing mail accounts in GUI.
- **#182**: Implement live search bar component connected to SQLite FTS5 IPC queries.
- **#183**: Implement desktop native system notifications for new incoming emails.
- **#184**: Implement system tray icon with unread badge counter and quick action menu.
- **#185**: Implement native OS menu bar bindings (File, Edit, View, Window, Help).
- **#186**: Implement calendar view component with Month, Week, Day, and Agenda displays.
- **#187**: Implement calendar event creation and edit modal in GUI.
- **#188**: Implement contact manager view with VCard import/export support.
- **#189**: Implement offline state indicator and automatic reconnection banner in GUI.
- **#190**: Implement keyboard shortcut manager in GUI (Vim keys + standard Cmd/Ctrl shortcuts).
- **#191**: Implement attachment preview pane (images, PDFs, plain text) inside webview.
- **#192**: Implement infinite scrolling message list with virtualized list rendering (react-window).
- **#193**: Implement custom context menus (right-click) for messages, folders, and attachments.
- **#194**: Implement sound notification options for incoming mail alerts.
- **#195**: Implement macOS auto-update integration via Tauri v2 updater module.
- **#196**: Implement Windows toast notification integration with deep linking.
- **#197**: Implement Linux GTK/AppIndicator system tray compatibility.
- **#198**: Implement UI accessibility (a11y) ARIA attributes and keyboard focus management.
- **#199**: Implement Playwright / Spectron end-to-end GUI automation test suite.
- **#200**: Package and build native desktop binaries for Windows (x64), macOS (ARM64/x64), Linux (x64).
---
## Epic 5: CLI Live Pipeline & Interactive Inputs (#201 – #220)
- **#201**: Implement interactive password prompt using `rpassword` when password is not in keyring.
- **#202**: Connect `nuncio mail sync` to live IMAP/JMAP background sync workers.
- **#203**: Connect `nuncio account add` to live validation checking IMAP/SMTP connectivity.
- **#204**: Implement pipeable standard input (`stdin`) support for `nuncio mail send`.
- **#205**: Implement pipeable JSON stream output (`--json`) formatted for `jq` processing.
- **#206**: Implement daemon mode (`nuncio daemon start`) running sync loop in background process.
- **#207**: Implement IPC control channel (`nuncio daemon status/stop`) communicating with daemon.
- **#208**: Implement verbose logging level flags (`-v`, `-vv`, `-vvv`) emitting tracing output to stderr.
- **#209**: Implement shell completion generation (`nuncio system completion bash/zsh/fish/pwsh`).
- **#210**: Implement CSV / TSV export options for email and contact search queries.
- **#211**: Implement `nuncio cal sync` triggering live CalDAV WebDAV fetch.
- **#212**: Implement `nuncio cal list` displaying upcoming calendar events in formatted table.
- **#213**: Implement `nuncio folder create / delete / rename` executing live server folder management.
- **#214**: Implement non-interactive batch script mode for automated server environments.
- **#215**: Implement signal handling (`SIGINT`, `SIGTERM`) for clean CLI process termination.
- **#216**: Implement configuration file generator creating default `~/.config/nuncio/config.toml`.
- **#217**: Implement environment variable override parser (`NUNCIO_ACCOUNT`, `NUNCIO_LOG`, etc.).
- **#218**: Implement interactive setup wizard (`nuncio account wizard`) guiding first-time users.
- **#219**: Implement exit status code standardization (0=success, 1=general, 2=usage, 3=network, 4=auth).
- **#220**: Implement CLI end-to-end integration tests using `assert_cmd` and `predicates`.
---
## Epic 6: Live E2E Integration & System Test Suite (#221 – #240)
- **#221**: Set up Docker Compose test environment with live Dovecot (IMAP) and Postfix (SMTP).
- **#222**: Set up Radicale CalDAV/CardDAV docker test container for live calendar integration tests.
- **#223**: Implement end-to-end mail sync test verifying live IMAP UID fetch into SQLite.
- **#224**: Implement end-to-end SMTP mail send test delivering email to local Postfix server.
- **#225**: Implement end-to-end CalDAV event sync test querying and storing live iCal events.
- **#226**: Implement TLS certificate validation failure integration test.
- **#227**: Implement network disconnection and auto-reconnect stress test under heavy load.
- **#228**: Implement concurrent multi-account synchronization integration test.
- **#229**: Implement large email (20MB attachment) upload and download stress test.
- **#230**: Implement malformed MIME payload resilience test ensuring parser does not crash.
- **#231**: Implement invalid iCal recurrence rule test ensuring rrule bounds hold.
- **#232**: Implement SQLite database migration rollback and forward migration test.
- **#233**: Implement keyring secret vault simulation test across Windows, macOS, and Linux mocks.
- **#234**: Implement FTS5 full-text search query stress test with 10,000 index entries.
- **#235**: Implement HTML sanitizer XSS payload injection test matrix verifying total isolation.
- **#236**: Implement TUI input event loop stress test feeding high-speed crossterm key streams.
- **#237**: Implement GUI IPC contract test verifying all JSON payloads validate against schema.
- **#238**: Implement memory leak audit under 24-hour continuous sync execution.
- **#239**: Implement cross-crate panic isolation test ensuring protocol errors do not crash app.
- **#240**: Integrate full live E2E test matrix into GitHub Actions CI workflow.
---
## Epic 7: Packaging, CI/CD & Cross-Platform Installers (#241 – #260)
- **#241**: Configure GitHub Actions build workflow matrix for Windows, macOS, and Linux.
- **#242**: Build Windows WiX installer (`.msi`) for `nuncio-gui` and `nuncio-cli`.
- **#243**: Build Windows standalone executable bundle (`.exe`) with embedded dependencies.
- **#244**: Build macOS Apple Silicon (ARM64) and Intel (x64) `.dmg` disk image packages.
- **#245**: Configure Apple Developer ID code signing and `notarytool` notarization step.
- **#246**: Build Linux AppImage standalone executable package.
- **#247**: Build Debian / Ubuntu `.deb` package with package metadata and desktop entry.
- **#248**: Build Fedora / RHEL `.rpm` package with RPM spec file.
- **#249**: Build Arch Linux `PKGBUILD` package definition for AUR publishing.
- **#250**: Configure automated GitHub Release asset upload on git tag push (`v*`).
- **#251**: Create Windows code signing certificate integration via Azure Key Vault / signtool.
- **#252**: Implement auto-updater server endpoint metadata file generation (`latest.json`).
- **#253**: Build Homebrew Cask formula for macOS installation (`brew install nuncio`).
- **#254**: Build Chocolatey package for Windows installation (`choco install nuncio`).
- **#255**: Build Scoop manifest for Windows CLI installation (`scoop install nuncio`).
- **#256**: Create Linux `.desktop` desktop entry and application icons (SVG, PNG 512x512).
- **#257**: Create man pages for CLI (`man nuncio`) using `clap_mangen`.
- **#258**: Implement reproducible build pipeline verifying SHA-256 checksums across OS targets.
- **#259**: Write end-user installation manual and troubleshooting guide in `docs/INSTALL.md`.
- **#260**: Perform final release verification audit confirming all 160 issues are closed.
---
*Roadmap generated and validated for Nuncio Zero-Mock Production Development.*
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# Nuncio Unified V3 Release Policy & Exhaustive Testing Matrix
> **Master Release Mandate & Cross-Platform / Cross-UI Verification Specification**
> **Author**: Master Orchestrator Agent (`agy`)
> **Repository**: [KofTwentyTwo/nuncio](https://github.com/KofTwentyTwo/nuncio)
---
## 1. Unified V3 Public Release Mandate
> **POLICY MANDATE**: No public GA release tag (`v3.0.0`) or binary distribution (`.msi`, `.dmg`, `.AppImage`) will be cut or published until **Phase V3 (Platform & AI Automation)** is 100% feature complete, fully tested, and working across **all 4 presentation UIs** on **Windows, macOS, and Linux**.
```
┌────────────────────────────────────────────────────────────────────────────────────────┐
│ UNIFIED V3 RELEASE MANDATE │
│ │
│ Phase V1: Core Infrastructure & GA Baseline (CLI, TUI, GUI, MCP, nunciod Daemon) │
│ │ │
│ ▼ │
│ Phase V2: Enterprise Protocols (JMAP, OAuth2, CardDAV, GPG/PGP, Scheduling Links) │
│ │ │
│ ▼ │
│ Phase V3: Platform & AI (Local LLM Triage, Summaries, WASM Plugins, Cloud Relay) │
│ │ │
│ ▼ │
│ ┌────────────────────────────────────────────────────────────────────────────────────┐ │
│ │ GA PUBLIC RELEASE TAG (`v3.0.0`) │ │
│ │ Requires 100% Feature Parity & Verification across ALL 4 UIs │ │
│ └────────────────────────────────────────────────────────────────────────────────────┘ │
└────────────────────────────────────────────────────────────────────────────────────────┘
```
---
## 2. CI/CD & Local Mock Protocol Testing Architecture
To guarantee offline, deterministic validation in CI/CD and local environments, external network services and OS vaults are 100% isolated via mock layers:
| Target System / Protocol | Mock Infrastructure Provider | Verification Strategy |
| :--- | :--- | :--- |
| **IMAP4rev1** | `wiremock::MockServer` + `tokio-rustls` | Simulates TLS connection handshakes, `CAPABILITY`, `SELECT`, `FETCH`, and `IDLE` push notification streams. |
| **SMTP Transport** | `wiremock::MockServer` + `lettre` | Validates `EHLO`, STARTTLS (587), Implicit TLS (465), AUTH LOGIN/PLAIN, and multipart MIME construction. |
| **CalDAV & CardDAV** | `wiremock::MockServer` | Simulates HTTP PROPFIND, REPORT queries, XML multistatus responses, and iCalendar/vCard payloads. |
| **JMAP (RFC 8620/8621)** | `wiremock::MockServer` | Simulates JMAP session discovery (`/.well-known/jmap`), `Email/get`, `Email/changes`, and batch JSON POST methods. |
| **OS Keyring Vault** | `MockKeyring` Provider | Simulates native OS credential storage without touching system keychains (`libsecret`, Keychain, Credential Manager). |
| **Database Persistence** | `DatabaseEngine::connect_ephemeral()` | Instantiates isolated SQLite WAL databases with auto-cleanup upon test drop. |
---
## 3. Full Combinations Cross-UI & Cross-OS Test Matrix
Testing enforces full combinatorial validation across **4 Presentation UIs** $\times$ **3 Target OS Platforms**:
```
FULL COMBINATORIAL TEST MATRIX
Linux (Ubuntu) macOS (Sonoma) Windows (Win11)
┌──────────────────┬──────────────────┬──────────────────┐
nuncio-cli │ POSIX Sockets │ POSIX Sockets │ Named Pipes │
│ --json & Pipes │ --json & Pipes │ --json & Pipes │
├──────────────────┼──────────────────┼──────────────────┤
nuncio-tui │ Ratatui Terminal │ Ratatui Terminal │ Ratatui Terminal │
│ Crossterm <16ms │ Crossterm <16ms │ Crossterm <16ms │
├──────────────────┼──────────────────┼──────────────────┤
nuncio-gui │ Tauri v2 WebKitGTK│ Tauri v2 WKWebView│ Tauri v2 WebView2│
│ React Glassmorphic│ React Glassmorphic│ React Glassmorphic│
├──────────────────┼──────────────────┼──────────────────┤
nuncio-mcp │ Stdio JSON-RPC │ Stdio JSON-RPC │ Stdio JSON-RPC │
│ Local AI Agents │ Local AI Agents │ Local AI Agents │
└──────────────────┴──────────────────┴──────────────────┘
```
---
## 4. End-to-End (E2E) Test Suite Workflow Coverage
E2E integration test suites validate complete multi-shell concurrent workflows:
1. **`daemon_e2e_test.rs`**: Launches `nunciod`, connects `IpcClient` from CLI, TUI, GUI, and MCP simultaneously, and verifies state synchronization and push event broadcasting across all 4 shells.
2. **`cli_system_test.rs`**: Executes pure `<Noun> <Verb>` commands (`account add`, `mail sync`, `mail search`, `cal list`), verifying deterministic JSON output envelopes (`--json`).
3. **`tui_system_test.rs`**: Simulates crossterm keyboard events (`j`/`k`/`h`/`l`/`gg`/`gi`), verifying 3-pane split rendering and sub-16ms frame updates.
4. **`gui_system_test.rs`**: Validates Tauri v2 IPC bridge bindings, window creation, and HTML email iframe CSP sandboxing.
5. **`mcp_system_test.rs`**: Validates JSON-RPC 2.0 stdio server initialization, tool calls (`nuncio_mail_send`), resource reads (`nuncio://mail/inbox`), and HITL safety prompts.
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# Nuncio Roadmap (authoritative)
> **This document supersedes** `PLAN-nuncio-roadmap.md`, `PLAN-production-roadmap-100-plus.md`,
> `PLAN-enhanced-roadmap-v1-v2-v3.md`, `PLAN-multi-shell-parity-v1-v3.md`,
> `PLAN-testing-matrix-and-v3-release-policy.md`, `TODO.md`, `TICKET-*.md`,
> `EXECUTIVE-REVIEW.md`, and `EXECUTIVE-AUDIT-REVIEW.md`. Those were authored by the
> Antigravity agent and contained systematic fabrication (self-awarded scores,
> nonexistent benchmarks, "completed" epics that were never wired) and have been
> **removed** (2026-07-26); they remain in git history only. **Do not trust them.**
>
> Ground truth for the starting state: the 2026-07-26 forensic assessment
> (`knowledge/nuncio-poc-ground-truth-2026-07-26` in the second-brain vault).
> Architecture decision: [`docs/adr/0001-engine-first-grpc-architecture.md`](adr/0001-engine-first-grpc-architecture.md).
## North star
Nuncio is a **local-first (sovereign) mail, calendar, and contacts engine**: a
background daemon (`nunciod`) that owns all state, credentials, and protocol
logic, and **publishes a versioned gRPC API over loopback**. User interfaces are
**separate native client projects** that consume that API — they hold no business
logic and no data of their own.
This inverts the failure mode of the original POC, which built four UI shells on
top of a spine that did not exist, so each shell faked what the spine could not
provide and drifted into four disjoint fake data stores. With one engine and one
published contract, **feature parity across clients becomes a property of the
API, not a discipline anyone has to police.**
## Target architecture
- **`nunciod` is the product.** It owns the SQLite store, credentials (real OS
keyring), the protocol sync loops (IMAP/SMTP first; then JMAP, CalDAV, CardDAV),
the NSQL filter engine, and all business logic. The `nuncio-{core,mail,cal,
contacts,store,filter}` crates are libraries the daemon composes.
- **The published API** is a set of versioned Protocol Buffers definitions
(`proto/nuncio/v1/*.proto`) served by the daemon via **gRPC over loopback TCP
(`127.0.0.1`)** with a **bearer-token handshake** — the token minted into the OS
keyring on first run and sent as gRPC metadata. Unary RPCs for commands and
queries; **server-streaming RPCs for push** (new mail, sync progress, events).
- **The `.proto` files are the contract** — versioned, in-repo, the single source
of truth every client codegens against.
- **One reference client stays in-repo: `nuncio-cli`**, a tonic gRPC client. It
dogfoods the API and drives the end-to-end tests.
- **Clients live in separate repos**, each consuming the published proto/SDK:
`nuncio-tui` (Rust), `nuncio-gui-macos` (Swift + grpc-swift),
`nuncio-gui-windows` (WinUI / C# + Grpc.Net), `nuncio-mcp` (MCP ↔ gRPC bridge).
Linux is supported at the daemon + CLI level; a native Linux GUI is deferred.
## Principles (anti-theater guardrails)
1. **A capability is "done" only when engine + proto + CLI command + offline E2E
test all exist together.** Never before.
2. **No fabricated success.** A code path that cannot do the real thing returns an
honest `Unimplemented`/error — never a fake "Message sent" or canned data.
3. **Green CI is a gate, not a decoration.** `fmt`, `clippy` (all targets,
warnings-as-errors), tests, and mock-server E2E must pass before merge.
4. **"Done" is re-derived from tested behavior**, never inherited from a doc label.
5. **Scope is earned.** The four never-real features (OpenPGP/S-MIME E2EE, WASM
plugins, local-LLM summarization, NLP scheduler) are **deferred and must be
re-justified as genuine engine capabilities** before re-entering scope.
## Phases
Phases 0–4 deliver "the engine is 100% solid and publishing its full API." Phase 5
is "clients consume it."
### Phase 0 — Honesty & foundation
**Goal:** stop lying, shrink to what matters, and get the tree green.
**Exit criteria:** workspace is engine crates + CLI only; `cargo fmt`,
`cargo check-all`, `cargo test-all`, and mock-server E2E all pass in CI; no crypto
key literal exists in source; credentials come from the real OS keyring; fabricated
docs archived; `CLAUDE.md` and `README.md` reflect verified reality; public
releases are marked pre-alpha and the fail-open auto-updater is disabled.
### Phase 1 — gRPC skeleton + the spine
**Goal:** a real account that fetches, stores, reads, and sends — end-to-end,
persisted, over gRPC, driven by the CLI.
**Exit criteria:** daemon serves gRPC over loopback with token auth; CLI is a
gRPC client; `IMAP fetch → store → read → SMTP send` works against mock servers
in an offline E2E test; the "simulate remote mutation" outbox worker and the
status-flag "sync" are gone; the store correctness bugs (FTS-vs-encryption, FTS
backfill, salvage schema, transient-error≠corruption) are fixed.
### Phase 2 — API completeness for the spine
**Goal:** the full proto surface for everything the spine can do, published.
**Exit criteria:** `proto/nuncio/v1` covers accounts, folders, mail
(sync/list/read/send/flags), search, filters, and the events stream; generated
SDK stubs published; contract tests in place; the legacy JSON-RPC IPC removed.
### Phase 3 — Feature completeness (behind the API)
**Goal:** calendar, contacts, filters, and JMAP made real.
**Exit criteria:** real CalDAV transport + TZID fix + rrule; real CardDAV sync;
filter-engine correctness fixes (account scoping, `ON ACCOUNT`, non-ASCII offsets,
`NOT IN`); real JMAP HTTP client + camelCase fix. Each ships only with engine +
proto + CLI + E2E together.
### Phase 4 — Security & release hardening
**Goal:** the engine is production-solid.
**Exit criteria:** fail-*closed* updater with signature verification; auth
hardening (optional UDS/named-pipe, mTLS); real WORM keys; HTML sanitization
pipeline; an honest release pipeline and version policy. **This is the "engine
100% solid + full API published" milestone.**
### Phase 5 — Client projects
**Goal:** the native clients, in separate repos, consuming the published API.
**Exit criteria:** `nuncio-tui`, `nuncio-gui-macos`, `nuncio-gui-windows`, and
`nuncio-mcp` exist as independent projects built against the published proto/SDK;
parity is guaranteed by the contract. Re-justified V2/V3 features are planned here
or folded back into Phase 3 as they earn their place.
## Detailed backlog
Phase 0 and Phase 1 are decomposed into engineering-ready stories in
[`docs/BACKLOG.md`](BACKLOG.md).
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# Session State
- Current Task: Initializing `nuncio` project setup, git repository, Cargo workspace structure, and GitHub repository/roadmap.
- Target domain: nuncio.mx
- Architecture: Library-first Rust workspace with skinny TUI and GUI shells.
- Next Step: Initialize Cargo workspace and git repo, push to GitHub `KofTwentyTwo/nuncio`.
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# Ticket Specification: Database Corruption Detection, Recovery & Self-Healing Engine
**Epic ID**: `EPIC-DATABASE-CORRUPTION-RECOVERY`
**Tracking Issues**: `#286` through `#300`
**Target Release**: Nuncio v1.0.0 (Core Storage Resilience Milestone)
**Specification Document**: [`wiki/Database-Corruption-and-Recovery-Specification.md`](file:///R:/Git.Local/KofTwentyTwo/nuncio/wiki/Database-Corruption-and-Recovery-Specification.md)
**Status**: `READY_FOR_IMPLEMENTATION`
---
## 1. Executive Summary & Objective
Implement a **5-Stage Automated Database Self-Healing & Recovery Pipeline** in `crates/nuncio-store` and `crates/nunciod`.
Unexpected power loss, OS crashes mid-write, disk bit rot, or WAL index mismatches must **never** cause Nuncio to crash silently or lose unrecoverable account credentials and rule configurations. When corruption occurs, Nuncio will automatically probe database integrity on startup, isolate damaged files into forensic backups, salvage valid tables, initiate clean remote server resyncs (using intact OS Keyring secrets), and broadcast recovery status alerts across all 4 presentation shells.
---
## 2. 5-Stage System Pipeline
```
[ Startup / Query Error ]
│
▼
┌────────────────────────────────────────────────────────┐
│ Stage 1: Pre-Flight Integrity Probe │
│ Executes `PRAGMA quick_check(10);` in DatabaseEngine │
└──────────────────────────┬─────────────────────────────┘
│
▼
┌────────────────────────────────────────────────────────┐
│ Stage 2: Forensic Backup Isolation │
│ Copies .db to `~/.nuncio/corrupted_backups/` │
└──────────────────────────┬─────────────────────────────┘
│
▼
┌────────────────────────────────────────────────────────┐
│ Stage 3: `.recover` Stream Salvage Engine │
│ Extracts valid tables (accounts, rules) to fresh DB │
└──────────────────────────┬─────────────────────────────┘
│
▼
┌────────────────────────────────────────────────────────┐
│ Stage 4: Remote Server Self-Healing Resync │
│ Triggers background IMAP/JMAP inbox rebuilding │
└──────────────────────────┬─────────────────────────────┘
│
▼
┌────────────────────────────────────────────────────────┐
│ Stage 5: 4-Shell IPC Recovery Notifications │
│ Broadcasts `CoreEvent::DatabaseRecovered` across UIs │
└────────────────────────────────────────────────────────┘
```
---
## 3. Work Breakdown & Tracking Issues (#286 – #300)
### Phase 1: Integrity Probing & Error Interception (`crates/nuncio-store`)
- [ ] `#286`: Implement `DatabaseEngine::check_integrity()` executing `PRAGMA quick_check(10);` on database open.
- [ ] `#287`: Implement SQLite error code trap catching `SQLITE_CORRUPT` (11), `SQLITE_NOTADB` (26), and `SQLITE_CANTOPEN` (14) during runtime query execution.
### Phase 2: Backup & Salvage Recovery Engine (`crates/nuncio-store`)
- [ ] `#288`: Implement `CorruptedBackupManager` isolating damaged `.db`, `.db-wal`, and `.db-shm` files to `~/.nuncio/corrupted_backups/nuncio_corrupted_<timestamp>.db`.
- [ ] `#289`: Implement `SqliteRecoveryEngine` executing stream salvage to extract valid `accounts`, `filter_rules`, `filter_conditions`, and `filter_actions` records into a fresh SQLite file (`nuncio_main.db`).
- [ ] `#290`: Implement cryptographic hash-chain audit ledger verification (`verify_chain_integrity()`) to detect log tampering or corrupted `filter_execution_logs`.
### Phase 3: Daemon Self-Healing Resync (`crates/nunciod`)
- [ ] `#291`: Implement `SelfHealingSyncOrchestrator` in `nunciod` triggering clean background IMAP/JMAP resync when local email caches are reset.
- [ ] `#292`: Connect OS Keyring vault credentials to re-initialize authenticated protocol connections seamlessly post-recovery.
- [ ] `#293`: Implement `CoreEvent::DatabaseRecovered` event payload and broadcast it over IPC sockets.
### Phase 4: Multi-Shell Presentation Alerts (100% Parity)
- [ ] `#294`: **POSIX CLI (`nuncio-cli`)**: Display recovery notice when `DatabaseRecovered` event or status flag is detected.
- [ ] `#295`: **Terminal TUI (`nuncio-tui`)**: Render top menu recovery banner and status indicator.
- [ ] `#296`: **Desktop GUI (`nuncio-gui`)**: Render toast notification and resync status badge in React frontend.
- [ ] `#297`: **Native MCP (`nuncio-mcp`)**: Expose database health and recovery diagnostic status in `nuncio://system/status`.
### Phase 5: Testing & Simulation Suite
- [ ] `#298`: Create unit test simulating database header corruption and verifying Stage 1 detection.
- [ ] `#299`: Create integration test verifying Stage 2 backup creation and Stage 3 table salvage.
- [ ] `#300`: Verify zero warnings (`cargo check --workspace`), zero clippy lints (`cargo clippy --workspace -- -D warnings`), and 100% passing tests.
---
## 4. Acceptance Criteria & Quality Gates
1. **Zero Data Loss for Secrets**: OS Keyring secrets (passwords, OAuth tokens) remain 100% intact post-recovery.
2. **Automated Probe**: Startup `PRAGMA quick_check(10);` completes in $<15\text{ms}$.
3. **Backup Isolation**: Damaged `.db` files are copied to `~/.nuncio/corrupted_backups/` before repair.
4. **Zero Warnings**: `cargo check --workspace` yields 0 warnings.
5. **Zero Clippy Lints**: `cargo clippy --workspace -- -D warnings` yields 0 lints.
6. **100% Passing Tests**: All workspace tests pass.
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# Ticket Specification: NSQL Server-Side Email Filter & Automation Engine
**Epic ID**: `EPIC-NSQL-FILTER-ENGINE`
**Tracking Issues**: `#261` through `#285`
**Target Release**: Nuncio v1.0.0 (V3 Automation & Platform Milestone)
**Specification Document**: [`wiki/NSQL-Filter-Language-Specification.md`](file:///R:/Git.Local/KofTwentyTwo/nuncio/wiki/NSQL-Filter-Language-Specification.md)
**Status**: `READY_FOR_IMPLEMENTATION`
---
## 1. Executive Summary & Objective
Implement **Nuncio SQL Filter Language (NSQL)**—a declarative, type-safe, server-side email automation and thread triage engine powered by `sqlparser = "0.54"`.
The engine must execute **server-side inside `nunciod`** during protocol synchronization (IMAP IDLE / JMAP Push) **before** messages are written to local storage, and support 1M-email batch triage with fixed memory ceilings ($<10\text{MB}$ RAM). Under Nuncio's **100% Multi-Shell Parity Mandate**, all filter rule actions (creation, editing, visual building, dry-run testing, deletion, export, and log auditing) must be 100% accessible with 1:1 functional equivalence across `nuncio-cli`, `nuncio-tui`, `nuncio-gui`, and `nuncio-mcp`.
---
## 2. Core Architecture & System Specifications
```
NSQL ENGINE PIPELINE
[ Remote Email Server ] (IMAP IDLE / JMAP Push)
│
▼
┌────────────────────────────────────────────────────────┐
│ 1. Pre-Ingestion Async Pipeline │
│ Stage 1: Async MIME Parsing │
│ Stage 2: Lock-Free ArcSwap Rule Eval (<250µs) │
│ Stage 3: In-Memory Action Tagging │
│ Stage 4: Transactional SQLite WAL Save │
└──────────────────────────┬─────────────────────────────┘
│
▼
┌────────────────────────────────────────────────────────┐
│ 2. Dual-Write Consistency Engine │
│ Transactional Outbox + Exponential Backoff Retry │
└──────────────────────────┬─────────────────────────────┘
│
▼
┌────────────────────────────────────────────────────────┐
│ 3. Cryptographic Hash-Chain Execution Ledger │
│ HMAC-SHA256 Link Validation (filter_execution_logs) │
└──────────────────────────┬─────────────────────────────┘
│
▼
┌────────────────────────────────────────────────────────┐
│ 4. 4-Shell IPC Event Streaming │
│ Length-Prefixed JSON-RPC (CoreEvent::FilterExecuted)│
└────────────────────────────────────────────────────────┘
```
---
## 3. Micro-Task Work Breakdown & Tracking Issues (#261 – #285)
### Phase 1: Compiler & AST Engine (`crates/nuncio-filter`)
- [ ] `#261`: Initialize `crates/nuncio-filter` workspace crate with `sqlparser = "0.54"` dependency.
- [ ] `#262`: Implement `NuncioSqlDialect` overriding `sqlparser::dialect::Dialect` for NSQL tokenization.
- [ ] `#263`: Implement `NsqlParser` transforming SQL text into `nuncio-core` domain AST (`FilterRule`, `ConditionNode`, `RuleAction`).
- [ ] `#264`: Implement 6-pass `NsqlValidator` type checker:
- Pass 1: Field & operator compatibility check.
- Pass 2: Mailbox target folder existence verification.
- Pass 3: RFC 5322 email syntax validation.
- Pass 4: Size boundary verification ($\le 500\text{MB}$).
- Pass 5: ReDoS regex DFA memory compilation check.
- Pass 6: Logical contradiction & dead action analysis.
- [ ] `#265`: Implement lossless round-trip code generator (`rule.to_nsql()`) and verify algebraic invariants ($\text{parse}(\text{to\_nsql}(r)) \equiv r$).
### Phase 2: Storage & Cryptographic Ledger (`crates/nuncio-store`)
- [ ] `#266`: Add SQLite migration DDL for `filter_rules`, `filter_conditions`, `filter_actions`, and `pending_remote_mutations`.
- [ ] `#267`: Add SQLite migration DDL for `filter_execution_logs` with composite priority indexes.
- [ ] `#268`: Implement HMAC-SHA256 cryptographic hash-chain ledger for `filter_execution_logs` ($H_n = \text{HMAC}(K, H_{n-1} \parallel \text{data}_n)$) with automated chain integrity verification.
- [ ] `#269`: Implement parameterized SQLite query compilation (`sqlx::QueryBuilder`) guaranteeing zero raw string interpolation (100% SQLi immunized).
### Phase 3: Daemon Execution Engine & 1M-Message Batch Processor (`crates/nunciod`)
- [ ] `#270`: Implement `ArcSwap<CompiledFilterSet>` lock-free read cache manager ($<5\text{ns}$ access latency).
- [ ] `#271`: Integrate `FilterEngine::evaluate()` into `nunciod` background sync loop for pre-ingestion filtering.
- [ ] `#272`: Implement 1M-message Keyset Chunking Engine (`WHERE id > ? LIMIT 1000`) guaranteeing $<10\text{MB}$ RAM ceiling during bulk triage.
- [ ] `#273`: Implement Transactional Outbox pattern with exponential backoff and full jitter for remote IMAP/JMAP mutations.
- [ ] `#274`: Implement Memory-Only Dry-Run Preview API (`filter.preview` IPC method) returning microsecond-resolution match traces without database mutations or network requests.
- [ ] `#275`: Implement `CoreEvent::FilterExecuted` and `CoreEvent::BatchFilterProgress` IPC length-prefixed streaming notifications over UNIX domain sockets and Windows named pipes.
### Phase 4: Security & Defensive Controls
- [ ] `#276`: Enforce AST recursion depth limit (`MAX_AST_DEPTH = 10`) to prevent stack overflow panics.
- [ ] `#277`: Implement Tokio 50ms hard execution timeout (`tokio::time::timeout`) for regular expression evaluation tasks.
- [ ] `#278`: Implement domain whitelist policy and session re-authentication for `FORWARD TO` actions.
- [ ] `#279`: Implement pre-flight DNS IP blacklisting (blocking `127.0.0.1`, `169.254.169.254`, private LAN subnets) with `max_redirects(0)` for outbound `CALL WEBHOOK` actions.
- [ ] `#280`: Implement HMAC-SHA256 request payload signatures (`X-Nuncio-Signature: t=timestamp,v1=hash`) for outbound webhooks.
### Phase 5: Multi-Shell Presentation Interfaces (100% Parity)
- [ ] `#281`: **POSIX CLI (`nuncio-cli`)**: Add `nuncio filter` subcommand suite (`list`, `create --sql`, `edit`, `delete`, `test --sql`, `export --format sql`, `import`, `logs`).
- [ ] `#282`: **Terminal TUI (`nuncio-tui`)**: Implement `AppMode::FilterRules` with NSQL code editor ↔ visual form builder toggle (`[s]`), dry-run previewer (`[t]`), priority re-ordering (`[J]`/`[K]`), and log inspector drawer (`[l]`).
- [ ] `#283`: **Desktop GUI (`nuncio-gui`)**: Build glassmorphic React `<FilterRulesModal />` component with "Visual Builder" vs "NSQL Query Editor" tabs, live syntax diagnostics, dry-run split pane, and execution log inspector tab.
- [ ] `#284`: **Native MCP (`nuncio-mcp`)**: Register `nuncio_filter_create`, `nuncio_filter_edit`, `nuncio_filter_delete`, `nuncio_filter_test`, `nuncio_filter_logs`, `nuncio_filter_export` tools and stream `nuncio://filters` resource.
### Phase 6: Integration Testing & Verification
- [ ] `#285`: Create end-to-end integration test suite verifying 1,000,000 message batch performance, zero-warning compiler build, zero-clippy lints, and 100% test pass rate across workspace crates.
---
## 4. Acceptance Criteria & Quality Gates
1. **Zero Warnings Gate**: `cargo check --workspace` yields 0 warnings.
2. **Zero Clippy Lints Gate**: `cargo clippy --workspace -- -D warnings` yields 0 lints.
3. **100% Test Pass Gate**: All unit, integration, and E2E system tests pass cleanly.
4. **Memory Constraint Gate**: Processing 1,000,000 messages in batch mode MUST NOT exceed **10 MB peak RAM**.
5. **ReDoS Timeout Gate**: Unsafe regex expressions MUST be aborted within **50 milliseconds**.
6. **SQLi Immunization Gate**: Zero raw string format interpolation into SQL query buffers.
7. **Multi-Shell Parity Gate**: 100% 1:1 capability parity verified across CLI, TUI, GUI, and MCP interfaces.
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# TODO: Nuncio Zero-Mock Production Roadmap & Task Tracking
> **Authoritative Single Source of Truth**: All task tracking, issue status, and milestone progress are maintained in [docs/PLAN-production-roadmap-100-plus.md](file:///R:/Git.Local/KofTwentyTwo/nuncio/docs/PLAN-production-roadmap-100-plus.md) and on GitHub:
> - **GitHub Project Board**: [Nuncio Roadmap Project #5](https://github.com/users/KofTwentyTwo/projects/5)
> - **GitHub Milestones**: [KofTwentyTwo/nuncio/milestones](https://github.com/KofTwentyTwo/nuncio/milestones) (`v0.1.0` through `v3.0.0`)
> - **GitHub Issues**: [KofTwentyTwo/nuncio/issues](https://github.com/KofTwentyTwo/nuncio/issues)
---
## Active Phase: Zero-Mock Production Engineering (#101 – #260)
### Epic 1: Real Protocol Drivers & Live Sync Engine (#101 – #125) - `COMPLETED`
- [x] `#101`: Implement live IMAP connection pool with TLS handshake via `async-imap` & `tokio-rustls`.
- [x] `#102`: Implement IMAP IDLE push notification listener loop for real-time inbox updates.
- [x] `#103`: Implement incremental IMAP UID FETCH message sync algorithm storing flags in SQLite.
- [x] `#104`: Implement IMAP mailbox list parser mapping RFC 3501 hierarchy to domain `Folder` entities.
- [x] `#105`: Implement IMAP draft, sent, trash, and flag state mutations (`STORE +FLAGS`, `COPY`, `EXPUNGE`).
- [x] `#106`: Implement live SMTP transport client using `lettre` with STARTTLS and Implicit TLS support.
- [x] `#107`: Implement MIME message builder for multipart/alternative (plain text + HTML + attachments).
- [x] `#108`: Implement live SMTP delivery confirmation and queue retry mechanism with backoff.
- [x] `#109`: Implement JMAP Session resource discovery (`/.well-known/jmap`) and API token authentication.
- [x] `#110`: Implement JMAP `Email/get` and `Email/changes` push synchronization engine.
- [x] `#112`: Implement CalDAV WebDAV report query builder for time-range event filtering (`RFC 4791`).
- [x] `#113`: Implement CalDAV multi-status XML parser extracting `VEVENT` data using `quick-xml`.
### Epic 2: Storage & Data-at-Rest Security (#126 – #145) - `COMPLETED`
- [x] `#126`: Implement SQLite WAL journal mode pragmas and connection pool manager in `nuncio-store`.
- [x] `#127`: Implement PBKDF2/Argon2id key derivation module mapping OS vault secrets to AES keys.
- [x] `#128`: Implement transparent column-level message body encryption/decryption in SQLite queries.
- [x] `#129`: Implement `ZeroizeOnDrop` credential memory hygiene for all account configuration fields.
- [x] `#130`: Implement SQLite FTS5 full-text search index setup with trigram tokenizer for email bodies.
- [x] `#131`: Implement FTS5 query builder with prefix search and quote escaping.
### Epic 3: TUI Interactive Terminal App (#146 – #170) - `COMPLETED`
- [x] `#146`: Connect `TuiApp` to live `DatabaseEngine` and `EventBus` channels.
- [x] `#147`: Implement dynamic folder list rendering from SQLite in TUI Sidebar.
- [x] `#148`: Implement live message list rendering for selected folder with unread indicators.
- [x] `#149`: Implement dynamic email reader view rendering plain text body from SQLite.
- [x] `#152`: Implement interactive compose email modal with multi-line text input fields.
- [x] `#153`: Implement interactive reply / reply-all modal populating subject and recipient headers.
### Epic 4: Native Desktop GUI (Tauri v2 + React/Vite) (#171 – #200) - `COMPLETED`
- [x] `#171`: Initialize Tauri v2 application framework structure in `crates/nuncio-gui/src-tauri`.
- [x] `#172`: Initialize React + Vite + TypeScript frontend project structure in `crates/nuncio-gui/ui`.
- [x] `#173`: Configure native window windowing rules (title bar, minimum dimensions 1024x768).
- [x] `#174`: Implement Tauri v2 IPC commands (`#[tauri::command]`) linking React to `IpcBridge`.
- [x] `#175`: Implement React split-view layout component (Sidebar, MessageList, Reader).
- [x] `#176`: Implement Sandboxed HTML email iframe renderer component with strict CSP.
- [x] `#177`: Implement Account Settings & Connectivity Manager modal with Add, Edit, Delete, Test.
### Epic 5: CLI Live Pipeline & Interactive Inputs (#201 – #220) - `COMPLETED`
- [x] `#201`: Implement interactive password prompt using `rpassword` when password is not in keyring.
- [x] `#202`: Connect `nuncio mail sync` to live IMAP/JMAP background sync workers.
- [x] `#203`: Connect `nuncio account add` to live validation checking IMAP/SMTP connectivity.
### Epic 6: Live E2E Integration & System Test Suite (#221 – #240) - `COMPLETED`
- [x] `#237`: Implement GUI IPC contract test verifying all JSON payloads validate against schema.
- [x] `#240`: Integrate full E2E test matrix into GitHub Actions CI workflow.
### Epic 7: Packaging, Installers & CI/CD (#241 – #260) - `COMPLETED`
- [x] `#241`: Configure GitHub Actions release matrix for Windows, macOS (arm64 + x86_64), and Linux.
- [x] `#242`: Build Windows binary archive (`.zip`) and setup installer integration in `.github/workflows/release.yml`.
- [x] `#243`: Build macOS Universal `.tar.gz` and `.dmg` binary bundles.
- [x] `#244`: Build Linux AppImage and standalone `.tar.gz` packages.
- [x] `#245`: Create Homebrew Tap formula `Formula/nuncio.rb` in `KofTwentyTwo/homebrew-tap` (`brew install koftwentytwo/tap/nuncio`).
- [x] `#246`: Create automated daily pre-release Nightly build pipeline (`0 0 * * *`) tagging `nightly-<YYYY-MM-DD>`.
### Epic 10: Cross-Platform Auto-Update Engine (#301 – #315) - `IN_PROGRESS`
- [x] `#301`: Implement `UpdateEngine` in `crates/nuncio-core/src/update.rs` querying GitHub Releases API (`https://api.github.com/repos/KofTwentyTwo/nuncio/releases/latest`).
- [x] `#302`: Implement SHA-256 checksum verification against `SHA256SUMS.txt` before binary replacement.
- [x] `#303`: Implement atomic self-replacement engine swapping running binary executables (`nuncio-cli`, `nuncio-tui`, `nuncio-mcp`, `nunciod`).
- [x] `#304`: Implement 24h background auto-update checker loop in `nunciod` broadcasting `CoreEvent::UpdateAvailable` over IPC.
- [x] `#305`: Add `nuncio self-update`, `nuncio update check`, and `nuncio update apply` subcommands to `nuncio-cli`.
- [x] `#306`: Build glassmorphic `<UpdateBanner />` in Tauri v2 Desktop GUI (`nuncio-gui`) linked to `@tauri-apps/plugin-updater`.
- [x] `#307`: Add `[u]` key chord and update notification banner to Terminal TUI (`nuncio-tui`).
- [x] `#308`: Add `nuncio_update_check` and `nuncio_update_apply` tools to Native MCP (`nuncio-mcp`).
- [x] `#309`: Verify zero-warning quality gates (`cargo check --workspace`) and 100% test pass rate across workspace.
### Epic 8: NSQL Server-Side Email Filter & Automation Engine (#261 – #285) - `COMPLETED`
- [x] `#261`: Initialize `crates/nuncio-filter` workspace crate with `sqlparser = "0.54"` dependency.
- [x] `#262`: Implement `NuncioSqlDialect` overriding `sqlparser::dialect::Dialect` for NSQL tokenization.
- [x] `#263`: Implement `NsqlParser` transforming SQL text into `nuncio-core` domain AST (`FilterRule`, `ConditionNode`, `RuleAction`).
- [x] `#264`: Implement 6-pass `NsqlValidator` type checker (field types, folder existence, RFC 5322, ReDoS check, contradiction detection).
- [x] `#265`: Implement lossless round-trip code generator (`rule.to_nsql()`) verifying algebraic invariants.
- [x] `#266`: Add SQLite migration DDL for `filter_rules`, `filter_conditions`, `filter_actions`, and `pending_remote_mutations`.
- [x] `#267`: Add SQLite migration DDL for `filter_execution_logs` with composite priority indexes.
- [x] `#268`: Implement HMAC-SHA256 cryptographic hash-chain ledger for `filter_execution_logs` with automated chain verification.
- [x] `#269`: Implement parameterized SQLite query compilation (`sqlx::QueryBuilder`) guaranteeing zero raw string interpolation (100% SQLi immunized).
- [x] `#270`: Implement `ArcSwap<CompiledFilterSet>` lock-free read cache manager ($<5\text{ns}$ access latency).
- [x] `#271`: Integrate `FilterEngine::evaluate()` into `nunciod` background sync loop for pre-ingestion filtering.
- [x] `#272`: Implement 1M-message Keyset Chunking Engine (`WHERE id > ? LIMIT 1000`) guaranteeing $<10\text{MB}$ RAM ceiling during bulk triage.
- [x] `#273`: Implement Transactional Outbox pattern with exponential backoff and full jitter for remote IMAP/JMAP mutations.
- [x] `#274`: Implement Memory-Only Dry-Run Preview API (`filter.preview` IPC method) returning microsecond-resolution match traces without database mutations or network requests.
- [x] `#275`: Implement `CoreEvent::FilterExecuted` and `CoreEvent::BatchFilterProgress` IPC length-prefixed streaming notifications over UNIX sockets and Windows named pipes.
- [x] `#276`: Enforce AST recursion depth limit (`MAX_AST_DEPTH = 10`) to prevent stack overflow panics.
- [x] `#277`: Implement Tokio 50ms hard execution timeout (`tokio::time::timeout`) for regular expression evaluation tasks.
- [x] `#278`: Implement domain whitelist policy and session re-authentication for `FORWARD TO` actions.
- [x] `#279`: Implement pre-flight DNS IP blacklisting (blocking `127.0.0.1`, `169.254.169.254`, private LAN subnets) with `max_redirects(0)` for outbound `CALL WEBHOOK` actions.
- [x] `#280`: Implement HMAC-SHA256 request payload signatures (`X-Nuncio-Signature: t=timestamp,v1=hash`) for outbound webhooks.
- [x] `#281`: Add POSIX CLI (`nuncio-cli`) `nuncio filter` subcommand suite (`list`, `create --sql`, `edit`, `delete`, `test --sql`, `export --format sql`, `import`, `logs`).
- [x] `#282`: Implement Terminal TUI (`nuncio-tui`) `AppMode::FilterRules` with NSQL code editor ↔ visual form builder toggle (`[s]`), dry-run previewer (`[t]`), priority re-ordering (`[J]`/`[K]`), and log inspector drawer (`[l]`).
- [x] `#283`: Build glassmorphic React `<FilterRulesModal />` component in `nuncio-gui` with "Visual Builder" vs "NSQL Query Editor" tabs, live syntax diagnostics, dry-run split pane, and execution log inspector tab.
- [x] `#284`: Register Native MCP (`nuncio-mcp`) `nuncio_filter_*` tools and stream `nuncio://filters` resource.
- [x] `#285`: Create end-to-end integration test suite verifying 1,000,000 message batch performance, zero-warning compiler build, zero-clippy lints, and 100% test pass rate across workspace crates.
### Epic 9: Database Corruption Self-Healing & Recovery Engine (#286 – #300) - `COMPLETED`
- [x] `#286`: Implement `DatabaseEngine::check_integrity()` executing `PRAGMA quick_check(10);` on database open.
- [x] `#287`: Implement SQLite error code trap catching `SQLITE_CORRUPT` (11), `SQLITE_NOTADB` (26), and `SQLITE_CANTOPEN` (14) during runtime query execution.
- [x] `#288`: Implement `CorruptedBackupManager` isolating damaged `.db`, `.db-wal`, and `.db-shm` files to `~/.nuncio/corrupted_backups/nuncio_corrupted_<timestamp>.db`.
- [x] `#289`: Implement `SqliteRecoveryEngine` executing stream salvage to extract valid `accounts`, `filter_rules`, `filter_conditions`, and `filter_actions` records into a fresh SQLite file (`nuncio_main.db`).
- [x] `#290`: Implement cryptographic hash-chain audit ledger verification (`verify_chain_integrity()`) to detect log tampering or corrupted `filter_execution_logs`.
- [x] `#291`: Implement `SelfHealingSyncOrchestrator` in `nunciod` triggering clean background IMAP/JMAP resync when local email caches are reset.
- [x] `#292`: Connect OS Keyring vault credentials to re-initialize authenticated protocol connections seamlessly post-recovery.
- [x] `#293`: Implement `CoreEvent::DatabaseRecovered` event payload and broadcast it over IPC sockets.
- [x] `#294`: Add POSIX CLI (`nuncio-cli`) database recovery status notice on `CoreEvent::DatabaseRecovered`.
- [x] `#295`: Render Terminal TUI (`nuncio-tui`) top menu recovery banner and status indicator.
- [x] `#296`: Render Desktop GUI (`nuncio-gui`) toast notification and resync status badge in React frontend.
- [x] `#297`: Expose Native MCP (`nuncio-mcp`) database health and recovery diagnostic status in `nuncio://system/status`.
- [x] `#298`: Create unit test simulating database header corruption and verifying Stage 1 detection.
- [x] `#299`: Create integration test verifying Stage 2 backup creation and Stage 3 table salvage.
- [x] `#300`: Verify zero warnings (`cargo check --workspace`), zero clippy lints (`cargo clippy --workspace -- -D warnings`), and 100% passing tests.
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# ADR 0001 — Engine-first architecture with a published gRPC API
- **Status:** Accepted
- **Date:** 2026-07-26
- **Deciders:** James Maes
- **Supersedes:** the Antigravity-authored "sovereign architecture" direction and
the four-shell monorepo model (see the 2026-07-26 forensic assessment).
## Context
The original Nuncio POC was built as a Cargo workspace containing a core/daemon
plus four in-repo presentation shells (CLI, TUI, GUI/Tauri, MCP). A forensic
assessment on 2026-07-26 found that the mail spine (fetch → store → read → send)
worked in **none** of the four shells: each shell ran on its own disjoint,
throwaway, or hardcoded data source and fabricated success. Building UI shells
before the engine existed caused the shells to fake what the engine could not
provide, and the "100% four-shell parity" mandate was unenforceable by discipline.
We want a foundation where the engine can become genuinely solid and complete,
where feature parity across UIs is structural rather than aspirational, and where
each UI can eventually use the best-fit native technology per platform.
## Decision
1. **`nunciod` is the product.** It owns all state, credentials, protocol logic,
and business logic. The other engine crates are libraries it composes.
2. **The daemon publishes a versioned gRPC API** defined by Protocol Buffers in
`proto/nuncio/v1/`, served over **loopback TCP (`127.0.0.1`)** with a
**bearer-token handshake**; the token is minted into the OS keyring on first
run and passed as gRPC metadata. Push (new mail, sync progress, events) uses
**gRPC server-streaming**.
3. **The `.proto` files are the single source of truth** for the contract, are
versioned in-repo, and are what every client codegens against. Parity is a
property of the contract.
4. **`nuncio-cli` remains in-repo as the reference gRPC client** and E2E driver.
5. **All other UIs become separate projects/repos** consuming the published API:
`nuncio-tui` (Rust), `nuncio-gui-macos` (Swift), `nuncio-gui-windows`
(WinUI/C#), `nuncio-mcp` (MCP↔gRPC bridge). Native per-platform, not one
cross-platform shell.
## Consequences
**Positive**
- Parity is guaranteed by the shared contract; a client cannot offer what the API
does not expose.
- The workspace shrinks to engine + CLI, making the warnings-as-errors and E2E
gates achievable — a precondition for "100% solid."
- gRPC gives strong typing and mature codegen into Swift, C#, TS, and Rust, and
first-class server-streaming for mail's push model.
- gRPC's multiplexing eliminates the confirmed response/notification demux race in
the old hand-rolled JSON-RPC IPC.
- Native per-platform clients (matching the gclo WinUI + gclo-macos Swift pattern)
instead of one compromise Tauri app.
**Negative / costs**
- A published API is a versioned contract: it needs SDK/stub distribution and
contract tests so external clients don't silently break.
- Native per-platform clients mean more client repos to maintain than one shell.
- Loopback + token is adequate for local sovereign use but is **not** a networked
auth model; a future networked mode (see Alternatives) would require real
authN/Z, TLS, and a multi-tenant data model.
## Alternatives considered
- **JSON-RPC 2.0 + OpenRPC** (evolve the existing IPC): lowest migration cost and
human-readable, but weaker cross-language typing/codegen than gRPC. Rejected in
favor of stronger contracts for polyglot native clients.
- **REST + OpenAPI + WebSocket/SSE**: browser-native and familiar, but two
mechanisms to maintain and an awkward fit for RPC-shaped mail operations.
- **Networked server from the start**: enables mobile/web/multi-device immediately
but forces full authN/Z, TLS, and multi-tenancy into V1 and reshapes the
sovereign story. Deferred; may return as an explicit future ADR.
- **One cross-platform GUI (Tauri/Flutter)**: fewer client repos, but back to one
compromise GUI technology. Rejected in favor of native per-platform.
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