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66b1aad3f2
The preflight probe in mcp-health-check only ever sent a bare GET to the server URL. Some Streamable HTTP MCP servers route POST exclusively and answer any GET with 404 — api.telnyx.com/v2/mcp is one — so the probe failed permanently against a perfectly healthy server. 404 is not in HEALTHY_HTTP_CODES, so every probe failed, the backoff compounded to the 10-minute ceiling, and the hook blocked every tool call for that server before it left the machine while `claude mcp list` still reported it Connected. Replay a failed GET as a real JSON-RPC initialize POST and accept that as proof of life. Whitelisting 404 was the alternative, but it would mask genuine outages on every other server. Adds a regression test with a POST-only server that 404s all GETs and validates the initialize body; it fails without this change. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>