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Looking for a specific client? Claude, Claude Code, ChatGPT, Cursor, VS Code, Notion, and Mistral Le Chat each have a dedicated page. Any other MCP client can use Langmail if it supports two things:
  1. Remote servers over the Streamable HTTP transport — the server lives at https://mcp.langmail.me/mcp; there is no local process to spawn.
  2. The MCP authorization flow (OAuth 2.1) — the client discovers the authorization server, registers itself dynamically, and opens a browser for you to sign in and consent. No manual API keys are involved.
If your client meets both, connecting is one config entry.

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Connect

Point the client at the server URL using its remote/HTTP server option:
The client handles the rest through standard MCP authorization discovery. What it needs to support, concretely:
  • OAuth 2.0 protected resource metadata (RFC 9728) and authorization server metadata (RFC 8414)
  • Dynamic client registration (RFC 7591) as a public client
  • The authorization code grant with PKCE (S256)
Every step, with the exact endpoints and example responses, is documented in How authorization works — useful if you are building an MCP client or debugging one.
The user signing in needs a Langmail account with an active @langmail.me mailbox. Tokens for accounts without a mailbox are rejected with 401 invalid_token.

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Verify the connection

However you connected, the check is the same — ask the agent:
Prompt
A connected agent calls list_calendars and returns your calendars with their CalDAV URLs.