arbengine/mailbox-mcp

Official Model Context Protocol (MCP) server manifest for mailbox.bot — a hosted postal mail API for AI agents. Send certified mail, letters, notices, postcards, and document packets; mailbox.bot prints, stamps, mails, photographs, tracks, and exposes proof/status back to agents. Turn scans, PDFs, photos, provider notices, and notes from an address you already use into inbound agentic context. Dedicated mailbox.bot-issued street addresses plus mailbox numbers are a separate managed-address reservation path for approved accounts.

Send letters and certified mail from your agent, read inbound document context, manage postal threads, configure webhooks, retrieve scoped source documents, and rehearse lifecycle events with sandbox keys on the same production endpoints.

• Website: https://mailbox.bot
• Install: https://mailbox.bot/mcp-install
• Public tool catalog: https://mailbox.bot/api/mcp/tools-public
• Docs: https://mailbox.bot/mcp-install
• OpenAPI: https://mailbox.bot/openapi.json and https://mailbox.bot/openapi.yaml
• Registry: bot.mailbox/mailbox (DNS-verified on mailbox.bot)

What this repo is

This repository holds the public server.json manifest published to the official MCP Registry. The production server itself is hosted at https://mailbox.bot/api/mcp (streamable HTTP transport).

The repo also includes a small local stdio adapter (server.js) so registries such as Glama can start the server locally and inspect the live mailbox.bot tool definitions from https://mailbox.bot/api/mcp/tools-public. Production users should connect to the hosted endpoint.

If you're trying to use the server, go to mailbox.bot/mcp-install for client-specific setup (Claude Code, Claude Desktop, Cursor, etc.).

Local registry check

npm start

This starts a stdio MCP adapter for introspection. Authenticated tool calls should use the hosted streamable HTTP MCP endpoint at https://mailbox.bot/api/mcp.

Verifying authenticity

The namespace bot.mailbox/* is reserved via DNS proof on the apex domain mailbox.bot. Only the domain owner can publish servers under this namespace to the MCP Registry. If you see another server claiming to be mailbox.bot under a different namespace, it is not official.

The canonical manifest lives in this repo and is mirrored to the registry — both should match exactly.

Capabilities

• Outbound mail — send first-class letters, certified postal mail, and other USPS / FedEx / UPS classes from a PDF or a few common document formats.
• Document review and retrieval — stored outbound submissions can expose document_preview_url for human verification, and get_outbound_mail_document retrieves original source bytes with document.read scope.
• Inbound context — use private forwarding aliases to turn scans, PDFs, photos, provider notices, and notes from addresses the operator already controls into OCR-backed context.
• Managed address reservation — dedicated mailbox.bot-issued physical mailing and package addresses are available by reservation for approved accounts; approved issuance begins August 31, 2026.
• Sandbox mode — sk_agent_test_ keys exercise the full lifecycle (fulfillment photos, tracking, dispatch) with zero charge.
• Cost controls — dry_run cost preview, X-Max-Cost-Cents cap, per-key daily piece limits, structured retryable errors.
• Webhooks — signed delivery events with full payload inspection via REST.

Support conversations and support attachments are REST/OpenAPI/dashboard features, not MCP tools.

Full tool list and schemas: see the public MCP tool catalog, the install guide, and the OpenAPI specs at mailbox.bot/openapi.json and mailbox.bot/openapi.yaml.

License

MIT — covers this manifest and any examples added to this repo. The mailbox.bot service itself is operated under the mailbox.bot terms.