Starts (or reconfigures) a local, persistent REST API that a Claude Artifact can call directly (fetch) with full CORS support, instead of losing state on every refresh. Give it a schema describing the resources you need as seed data; each key becomes a collection served at http://localhost:/api/ supporting GET/POST/PUT/PATCH/DELETE. Data is written to sandbox_db.json next to this server and survives across Artifact refreshes and tool calls: collections that already exist from a previous call are left as-is, not overwritten. Use get_mock_api_status to check whether a server is already running before calling this.

Checks whether the local mock API is currently running, on which port, and lists its collections with item counts. Use this before assuming setup_mock_api needs to be called, or to confirm the server an Artifact is calling is actually up.