Unsupported protocol version: 2025-06-18 #2
Description
It looks like Claude has moved to a new protocol version that breaks compatibility with the MCP server. Running it on macOS 15.5 in debug mode I get:
claude mcp list --debug 2>&1 | head -50
[DEBUG] MCP server "tauri-mcp": Connection failed: McpError: MCP error -32602: Unsupported protocol version: 2025-06-18
[DEBUG] MCP server "tauri-mcp": Error message: MCP error -32602: Unsupported protocol version: 2025-06-18
[DEBUG] MCP server "tauri-mcp": Error stack: McpError: MCP error -32602: Unsupported protocol version: 2025-06-18
at QH0._onresponse (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:1042:17750)
at _transport.onmessage (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:1042:14902)
at DH0.processReadBuffer (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:1044:2325)
at Socket.<anonymous> (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:1044:1691)
at Socket.emit (node:events:518:28)
at Socket.emit (node:domain:489:12)
at addChunk (node:internal/streams/readable:561:12)
at readableAddChunkPushByteMode (node:internal/streams/readable:512:3)
at Readable.push (node:internal/streams/readable:392:5)
at Pipe.onStreamRead (node:internal/stream_base_commons:189:23)
[ERROR] MCP server "tauri-mcp" Connection failed: MCP error -32602: Unsupported protocol version: 2025-06-18
tauri-mcp: tauri-mcp serve - ✗ Failed to connect