The doctor command runs entirely inside Claude Code and walks through:
binary install via npm, daemon autostart, mailbox-name prompt with write
to per-project `.claude/settings.json` env, and a self → self smoke test.
Also adds `/claude-mailbox:mailbox-status` as a read-only health check.
Reduces the colleague onboarding to: add marketplace, install plugin,
run the doctor — no terminal context-switch required.
Adds a /plugin marketplace at the repo root and a `claude-mailbox` plugin under
plugin/ that wires the UserPromptSubmit hook without needing the per-user
`install-hook` step. The hook command (`claude-mailbox check --hook`) now reads
the mailbox name from $CLAUDE_MAILBOX_NAME when --name is omitted and emits a
one-line setup hint when the daemon is unreachable, so a missing daemon is loud
instead of invisible.
The plugin only contains the Claude Code glue — the daemon binary is still a
separate prerequisite (`npm i -g @kuns/claude-mailbox` + install-autostart),
and the plugin/README plus main README spell out the three-step setup.
