What Is Moltbook?
sanctumos/smcp-moltbook is an SMCP plugin that connects your Letta agent to the Moltbook bookkeeping API. It shipped in early February with a tight feature set:
- Multitenant support: A single plugin instance can manage books for multiple tenants, each with their own API key.
- API key persistence: During agent registration, the API key and agent name are saved to a config file so they survive restarts.
- Live API key retrieval: Tests can pull keys from the running Moltbook instance.
- SMCP ecosystem docs: The README positions Moltbook within the broader SMCP plugin catalog.
This is a good example of the SMCP plugin model in action: the plugin is a thin wrapper around an HTTP API, with just enough logic to handle authentication and multi-tenancy. The agent gets new tools — "create invoice," "check balance," "list transactions" — without any code changes to the agent itself.