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0.0
Hitch lets MCP clients -- Claude, ChatGPT, Cursor -- call your Rails
app's tools as a specific signed-in user, with access you can revoke.
You do not stand up a separate auth server, add Redis, or adopt a new
sign-in system. Hitch uses the authentication your app already has
(current_user or Current.user) and your configured cache store.
Underneath it is a full OAuth 2.1 authorization server implementing the
MCP 2026-07-28 authorization profile: PKCE (S256), audience-bound tokens
(RFC 8707), discovery metadata (RFC 8414 + RFC 9728), revocation
(RFC 7009), Client ID Metadata Documents, and optional Dynamic Client
Registration (RFC 7591). It adds an authenticated /mcp endpoint backed by
the official Ruby MCP SDK and a deny-default tool registry with schema
validation and size caps. SQLite and PostgreSQL supported.
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