Wire-level troubleshooting of Google Stitch MCP with Claude Code. The stdio proxy (@_davideast/stitch-mcp proxy) fails because it does not respond to MCP JSON-RPC initialize. Recommended fix:
claude mcp add stitch --transport http https://stitch.googleapis.com/mcp \
--header "X-Goog-Api-Key: YOUR-API-KEY" -s project
Direct HTTP transport to stitch.googleapis.com works immediately. API keys are generated inside the Stitch app; alternative path uses gcloud OAuth for heavy daily usage.