Beastyrabbit•4w ago

MCP Server Authentication Issue - "Not Authorized" Error

Hi! I'm having trouble getting the Convex MCP server to work with Claude Code (Anthropic's official CLI). Environment: - OS: Arch Linux (native, not WSL) - Convex version: latest - Using: Claude Code CLI with MCP integration - Project: Anonymous local deployment (not logged in) - Working directory: /mnt/storage/workspace/projects/wineapp Issue: When trying to use the MCP server tools through Claude Code, I consistently get: {"error":"Not Authorized: Run npx convex dev to login to your Convex project."} What I've tried: 1. Running npx convex dev - backend starts successfully at http://127.0.0.1:3210 2. Running npx convex mcp start - process starts but authentication fails 3. Checked .env.local - has CONVEX_DEPLOYMENT=anonymous:anonymous-wineapp 4. No ~/.convex/credentials file exists (using anonymous deployment) 5. Backend is accessible via dashboard at http://127.0.0.1:6790/?d=anonymous-wineapp MCP Configuration (.mcp.json): { "mcpServers": { "convex": { "command": "npx", "args": ["-y", "convex@latest", "mcp", "start"], "env": {} } } } Claude Code can see the MCP server configuration but can't authenticate with it. Is MCP server authentication supported for anonymous local deployments, or does it require a logged-in Convex account? Any guidance would be appreciated!