Sustained 502 Bad Gateway from mcp-proxy.anthropic.com (Gmail MCP)

The hosted Gmail MCP endpoint at mcp-proxy.anthropic.com has been returning Cloudflare 502 Bad Gateway errors for at least 2 hours. The Cloudflare error page flags the origin host (mcp-proxy.anthropic.com) as erroring, not Cloudflare itself.

Behaviour

• list_labels intermittently succeeds
• search_threads consistently fails with 502
• Retries within seconds return the same error
• Earlier, an agent-based run died with ConnectionRefused against the API — may be related upstream instability

Error details

• Cloudflare Ray IDs observed: 9ec84578087a1a6e, 9ec8453a0b701a6e
• Approx start: ~2 hours before 2026-04-15 04:40 UTC
• Region: AU (Melbourne edge)

Impact

Any workflow that chains multiple Gmail MCP calls fails partway. No client-side recovery possible.

Environment

• Claude Code CLI v2.1.109
• macOS
• Hosted Gmail MCP integration