S256, and the JSON-RPC initialize, tools/list, and tools/call methods. Start at
https://mcp.join.tl/; OAuth metadata is discovered from
https://mcp.join.tl/.well-known/oauth-protected-resource.
Request only the scopes needed for the intended tools. Respect MCP error objects and
the structured result schema. The io.modelcontextprotocol/skills capability is a
Jointl-advertised extension; clients may ignore it when unsupported.