mcp-sse-transport-unreliable-prefer-http-streamable

Some MCP servers (xint observed) fail SSE handshake with claude-code’s MCP client despite the server supporting both transports. Re-registering with type: http at the /mcp endpoint resolves the issue immediately. Always register new MCP servers as HTTP streamable first; only fall back to SSE if HTTP is unavailable.

Related

• xint-sse-transport-incompatible-with-claude-code-mcp-client
• xint-sse-transport-handshake-fails-use-http-streamable
• xint-mcp-sse-transport-fails-use-http
• xint-mcp-sse-transport-fails-use-http-at-mcp-endpoint
• mcp-sse-transport-incompatible-with-claude-code-client
• mcp-sse-transport-handshake-failure-switch-to-http-streamabl