After updating Claude Desktop to the latest version (April 14, 2026), the Figma MCP extension (v1.0.4) starts successfully but never responds to tool calls. The server initializes, lists tools, and then times out on every subsequent request. The root cause, identified in the MCP logs, is a protocol version mismatch: Claude Desktop now negotiates2025-11-25, while the Figma extension responds with2025-06-18.MCP server logs✓ Server started and connected successfully✓ Client → initialize { protocolVersion: "2025-11-25" } ← Claude Desktop✓ Server → initialize { protocolVersion: "2025-06-18" } ← Figma extension✓ tools/list → OK (get_design_context, get_metadata, etc.)✗ Any tool call → no response / timeout after 4 min✗ Client transport closed (intentional shutdown)
The pattern repeats on every session restart, reinstall of the extension, and reboot of Claude Desktop. Protocol negotiation succeeds but tool execution never reaches the extension.r
