MCP for Copilot DirectoryMethodologySubmit / Get featuredNewsletter

← Directory

Letter AI

Search and act on Letter AI sales enablement content, deals, and call recordings.

likely compatible

OAuth with discovery metadata and Dynamic Client Registration; use OAuth 2.0 → Dynamic discovery.

Rule R2c · what this means · Not tested in Copilot Studio.

Registry nameio.github.tractatus-ai/letter
Endpoint used for verdicthttps://api.letter.ai/v1/mcp
Transportsstreamable-http
Auth (Copilot Studio setting)OAuth 2.0 – Dynamic discovery
Last endpoint check2026-10-20T18:17:22Z · HTTP 401
Websitehttps://letter.ai
Version1.13.0
Registry updated2026-08-20
Track changes like this weekly. New Copilot-ready MCP servers, breakages and auth changes, in one short email.
Is this wrong or out of date? Email us. Data built 2026-10-20.