Building an OAuth2-secured MCP mail server against a real Dovecot/Postfix mailbox surfaced four separate Keycloak client registrations, a Default-vs-Optional scope trap, and a genuinely counter-intuitive Audience-mapper gotcha behind a mysterious active: false.
Tag: MCP
Categories
Debugging MCP servers
MCP communication MCP servers and clients can talk to each other in different technical ways: Type Description Transport URL stdio In/output using stdio stdio SSE Server-Sent Events Network (HTTP) /sse Streamable HTTP Streamable HTTP Network (HTTP) /mcp Classic MCP Alternative: mcpo (openapi.json) Tools like openwebui prefer to use open APIs (like openapi) to achieve the […]
In the last months MCP (Model Context Protocol) became one of the hot topics in the field of AI. While it is promoted for connecting tools/agents to LLM workflows there’s very little information about how things work on a technical basis. On most places So here’s my quest to answer those questions by writing a […]