ClaudeMailbox/plugin/commands/mailbox-doctor.md

---
description: Diagnose and auto-fix the Claude-Mailbox setup (Node version, binary install, port-conflict detection, daemon autostart, smoke test, optional base-prefix).
allowed-tools: Bash, Read, Edit, Write
---

You are running the **Claude-Mailbox doctor**. Walk through these checks in order. After each step, print a one-line `✓` / `✗` with the action you took. End with a summary block.

Use `Bash` only for `claude-mailbox` subcommands, `npm`, `node`, `where`/`which`, and HTTP probes. Use `Read`/`Edit`/`Write` for `.claude/settings.json` and `mailbox.json`. Never run `sudo` automatically — if elevation is needed, stop and ask.

## Step 1 — Node.js version

Run: `node --version`

claude-mailbox uses Node's built-in `node:sqlite` and therefore requires **Node 24 or newer**. Parse the major version from the output.

- **Major ≥ 24** → ✓ record the version, continue.
- **Major == 22 or 23** → ✗ Stop. `node:sqlite` is experimental on these and requires `--experimental-sqlite`. Print:
  > Found Node `<X.Y.Z>`. claude-mailbox needs Node 24 LTS or newer. Install via `nvm install 24 && nvm use 24` (or `nvs` / `winget install OpenJS.NodeJS.LTS` on Windows), then re-run the doctor.
- **Major < 22** → ✗ Stop with the same message; this Node is end-of-life.
- **Major ≥ 26** with `better-sqlite3` still installed globally from a previous version → just note: "Node `<X.Y.Z>` is fine for the current claude-mailbox (no native deps); ignore any old `better-sqlite3` build warnings from a prior install."

If `node --version` itself fails (`command not found`), stop and tell the user to install Node 24+ first.

## Step 2 — daemon binary on PATH

Run: `claude-mailbox --version`

- **Exit 0** → ✓ record the version. Continue.
- **Command not found** → binary missing. Install path:

  | Platform | Command |
  |---|---|
  | Windows | `npm install -g @kuns/claude-mailbox` (no admin) |
  | macOS / Linux | `npm install -g @kuns/claude-mailbox` (may fail with EACCES — never run sudo automatically; ask the user) |

  Prerequisite: `npm config get @kuns:registry` must point at `https://git.kuns.dev/api/packages/releases/npm/`. If not:

  ```
  npm config set @kuns:registry=https://git.kuns.dev/api/packages/releases/npm/
  ```

  After install, re-run `claude-mailbox --version`. If it still fails, stop and report.

## Step 3 — port-conflict check (before autostart!)

Default port is 37849. Probe whether anything is already on it:

```
curl -sf http://127.0.0.1:37849/health
```

- **Returns a JSON body with `"status":"ok"` and a `version` field that matches `claude-mailbox --version`** → it's already our daemon, ✓ skip to Step 5.
- **Returns 200 with `"status":"ok"` but a different `version`** → it's an older claude-mailbox; treat as running, ✓.
- **Returns non-200, non-JSON, or any other foreign response** → **port conflict**. Some other process owns 37849.
- **Connection refused** → port is free, ✓ continue to Step 4.

If port conflict detected:
1. Tell the user which process holds the port (Windows: `Get-NetTCPConnection -LocalPort 37849 | Select-Object OwningProcess`, then `Get-Process -Id <pid>`; macOS/Linux: `lsof -i :37849`).
2. Pick a free port. Default suggestion: **47900**. Verify it's free: `curl -sf http://127.0.0.1:47900/health` should fail with connection refused.
3. Read `~/.claude-mailbox/mailbox.json` (create empty `{}` if missing) and merge `{"port": <chosen>}`. Write back.
4. Also write the override into `.claude/settings.json` env so the plugin's hooks find the right URL:
   ```json
   "env": { "CLAUDE_MAILBOX_URL": "http://127.0.0.1:<chosen>" }
   ```
   Merge into existing env, preserving other keys.
5. Mark `restart_needed = true`.

## Step 4 — daemon autostart and running state

Run: `claude-mailbox status`

- `Running` → ✓ continue.
- `Stopped` → `claude-mailbox start`, re-check.
- `NotInstalled` → `claude-mailbox install-autostart`, then `claude-mailbox start`, re-check.

**Behavior on `install-autostart`:** The CLI tries a Scheduled Task first (`schtasks /RL LIMITED`, no admin). If Windows Group Policy returns "Access is denied", it falls back transparently to an `HKCU\Software\Microsoft\Windows\CurrentVersion\Run` registry entry plus a hidden `node serve` process — same per-user persistence, no admin needed. The chosen mechanism is recorded in `~/.claude-mailbox/autostart-mode` and respected by `status`/`start`/`stop`/`uninstall-autostart`.

If `install-autostart` still fails after both attempts (very rare — would mean both `schtasks` and `reg add` are blocked), stop and report what `status` and `start` printed.

## Step 5 — health probe

Hit `http://127.0.0.1:<port>/health` (use the configured port, not necessarily 37849). Expect a JSON body with `"status":"ok"` AND a `version` matching `claude-mailbox --version`. If unreachable or version mismatch, stop and report.

## Step 6 — mailbox identity (base prefix)

**No prompt by default.** Each Claude Code session gets a unique mailbox name auto-derived from its `session_id` (e.g., `claude-a8b3c1d2`).

Read `.claude/settings.json` and look for `env.CLAUDE_MAILBOX_NAME`.

- If set → ✓ "Mailbox prefix is `<X>`." (real name will be `<X>-<short_session_id>`).
- If unset → ✓ "Mailbox name will be auto-derived (`claude-<short_session_id>`)."

Ask once: *"Want to flavor your mailbox names with a memorable prefix (e.g., `backend`, `frontend`)? (yes / no / `<name>`)"*

On yes/explicit name: merge `env.CLAUDE_MAILBOX_NAME = <name>` into `.claude/settings.json`, preserving other keys. Mark `restart_needed = true`.

## Step 7 — smoke test

Use two ephemeral names — we don't need the real session name here:

```
claude-mailbox send  --from doctor-probe-a --to doctor-probe-b --body "ping from doctor"
claude-mailbox check --name doctor-probe-b
```

(If the port was changed in Step 3, pass `--url http://127.0.0.1:<port>` to both.)

The `check` output must be a JSON array with one message: `from: doctor-probe-a`, body matches. ✓ on success, ✗ otherwise.

## Step 8 — summary

```
Claude-Mailbox doctor
  node:          <version>
  binary:        <version>
  daemon:        Running    (port: <port>, what you did if anything)
  health:        ok
  port conflict: none | resolved (moved from 37849 to <port>)
  base prefix:   <name from settings, or "auto-derived (anonymous)">
  smoke test:    passed | failed
  restart hint:  yes if restart_needed, otherwise no
```

End with one of:

- All ✓ and no restart needed → "Setup is healthy. Your mailbox name this session will be revealed by the SessionStart hook on next session start."
- All ✓ and restart needed → "Restart Claude Code (or open a new session) so the SessionStart hook picks up the new env values."
- Anything ✗ → "Setup incomplete: <first failure>."