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Expose the mailbox to an LLM client (Claude Desktop / Code) over an in-process MCP server, so the bridge itself hosts it and the GUI controls it live. Strictly read-only: there is no tool that sends, moves, deletes or mutates mail — by design and asserted in tests. Transport: Streamable HTTP (MCP 2025-06-18) on a single POST /mcp endpoint bound to 127.0.0.1, answering each JSON-RPC request with application/json (no SSE — the server never pushes). Auth is a bearer token (the bridge password); the Origin header is validated to block DNS-rebinding. Permission tiers (config.McpPermission, default Disabled = server off): - Metadata — folders, metadata search (subject/sender/date), headers only. - Full — the above plus full-text body search and message body text. Tools: list_folders, search_messages, list_unread, get_message. Search combines subject/sender always and the encrypted FTS body index under Full; get_message returns headers always and body only under Full. Wiring: spawned in-process by both the CLI (main.rs) and the GUI bridge task (bridge.rs); a Disabled tier makes serve() a no-op, and it is kept out of the select! so it never triggers teardown. GUI gains an MCP section (tier selector, port, full-read warning, "copy client config" button) and a get_mcp_client_config command that emits the ready-to-paste client snippet. Validated live on a ~19k-message mailbox: initialize / tools/list / tools/call all conform; 401 without the bearer token, 403 on a foreign Origin, 202 on notifications; list_folders, body search and get_message (HTML stripped to text) all return correctly. 240 unit tests.