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ClaudeMailbox/node/README.md
Mika Kuns 8832eab6c7
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refactor(node): migrate from better-sqlite3 to node:sqlite, require Node 24+
Native binding caused install pain on every new Node major (no prebuilts +
node-gyp needs VS+Windows SDK to fall back). For this project's workload
(a few ops/day, no advanced SQLite features) better-sqlite3's perf edge is
irrelevant — node:sqlite's bundled, ABI-stable sync API is the better fit.

- db.ts: DatabaseSync, db.exec("PRAGMA …"), explicit BEGIN/COMMIT helper to
  replace db.transaction(); row casts go through unknown because node:sqlite
  returns Record<string, SQLOutputValue>.
- package.json: drop better-sqlite3 + @types/better-sqlite3, bump
  engines.node to >=24, vitest 2 → 4 (2.x couldn't resolve `node:sqlite`).
- mailbox-doctor: add Step 1 that enforces Node ≥24 with a concrete fix
  message, renumbers downstream steps.

Node 1.2.0 → 1.3.0. 35 transitive packages removed from the lockfile.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-19 16:07:21 +02:00

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# @kuns/claude-mailbox
Standalone MCP mail server that lets parallel Claude sessions coordinate with each other. TypeScript / Node port of the .NET `claude-mailbox` daemon — wire-compatible (same port, same `X-Mailbox` header, same MCP tool names, same SQLite schema).
## Install
One-time per machine:
```sh
npm config set @kuns:registry=https://git.kuns.dev/api/packages/releases/npm/
npm install -g @kuns/claude-mailbox
```
Then:
```sh
claude-mailbox install-autostart # registers per-OS autostart, no admin needed by default
```
See the [repository README](https://git.kuns.dev/releases/ClaudeMailbox/src/branch/main/README.md) for the full architecture, MCP tool reference, and `.mcp.json` snippet.
## Claude Code hook (auto-check inbox)
Register a `UserPromptSubmit` hook so Claude pulls pending mailbox messages before every prompt:
```sh
claude-mailbox install-hook --name alice # patches ~/.claude/settings.json
claude-mailbox install-hook --name alice --project # patches <cwd>/.claude/settings.json
claude-mailbox uninstall-hook # remove again
```
The hook is idempotent (running `install-hook` twice does nothing the second time) and only touches the `UserPromptSubmit` block — other hooks and settings are preserved.
Under the hood the hook runs `claude-mailbox check --name <mailbox> --hook`, which:
- prints unread messages in a Claude-friendly format,
- silently exits 0 if the inbox is empty or the daemon is unreachable (no context noise),
- marks the messages delivered so they aren't injected again next prompt.
Cost: one local HTTP round-trip plus Node coldstart per prompt (~100ms on Windows).
## Troubleshooting
`npm install` returns `401 Unauthorized`
: The Gitea registry usually serves the `releases` scope publicly, but if your instance requires auth you'll need a read token:
```sh
npm config set //git.kuns.dev/api/packages/releases/npm/:_authToken=<token>
```
`Cannot find module 'node:sqlite'` or similar
: claude-mailbox uses Node's built-in `node:sqlite`, stable since Node 24. On Node 22.523.x it works only with `--experimental-sqlite`. Upgrade to Node 24 LTS or newer: `nvm install 24 && nvm use 24` (or `winget install OpenJS.NodeJS.LTS` on Windows).