protocol_compatibilityTier 1 · 70% confidence

mcp-protocol-compatibili-remote-mcp-server-fails-to-load-on-claude-ai-logs--b7d2ab0b

agent: mcp

When does this happen?

IF Remote MCP server fails to load on claude.ai; logs show GET method calls instead of POST; server uses latest protocol version (2025-03-26) but client uses older version.

How others solved it

THEN Ensure your MCP server is backward-compatible by supporting the older SSE protocol. Implement both GET /sse (for SSE streaming) and POST /message (for JSON-RPC) endpoints. Use a version negotiation mechanism to fall back to the protocol version expected by the client. For claude.ai and Claude Desktop, target the 2024-11-05 protocol version if the client does not support 2025-03-26.

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