feat(mcp): support bot-signed jwt-bearer auth for MCP plugins - #1767
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Junior can only authenticate to an MCP server with static headers or per-actor OAuth, but gocd-mcp now accepts short-lived signed JWTs from bots instead of a shared API key (server half in https://github.com/getsentry/gocd-mcp/pull/5).
Let's add an optional
mcp.authblock to plugin manifests: when set, the MCP client signs a 5-minute jwt-bearer assertion with a private key from an env var and the SDK exchanges it for an access token, re-minting on the next 401. Without the block, behavior is unchanged.We use the SDK's
prepareTokenRequesthook instead of its built-inPrivateKeyJwtProvider, since that one sends the client_credentials grant and python MCP servers don't accept it yet.Tested the assertion shape against the deployed gocd-mcp server.