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fix(hooks): treat HTTP 404 MCP probes as reachable

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The mcp-health-check preflight probes HTTP MCP servers with a bare GET.
Some Streamable HTTP servers route only POST /mcp and answer a bare GET
with 404 (Paper Desktop 0.5.3 is one). The probe scored that as down and
blocked every tool call for the server indefinitely, since the 30s
backoff just re-probes and re-fails.

A routed HTTP response of any status proves the endpoint is reachable,
which is all this preflight claims to check -- 400/401/403/405/406 are
already treated this way for the same reason. Add 404 to the set and let
the real MCP client validate the endpoint.

Adds a regression test that stands up a POST-only server (404 on GET,
200 on POST /mcp); it fails on the current code and passes with the fix.
This commit is contained in:
bengio777
2026-08-24 22:27:30 -03:00
committed by Alex Schmitt
parent 66b1aad3f2
commit 06ac5b8a49
2 changed files with 76 additions and 2 deletions
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scripts/hooks/mcp-health-check.js
+5 -2
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@@ -28,8 +28,11 @@ const MAX_BACKOFF_MS = 10 * 60 * 1000;
// Claude Code's stored OAuth bearer token. Treat auth-gated responses as
// reachable so the real MCP client can attempt the authenticated call. A
// Streamable HTTP MCP server can also return 406 to a bare GET that omits
// Accept: text/event-stream; that still proves the endpoint is alive.
const HEALTHY_HTTP_CODES = new Set([200, 201, 202, 204, 301, 302, 303, 304, 307, 308, 400, 401, 403, 405, 406]);
// Accept: text/event-stream; that still proves the endpoint is alive. Some
// POST-only Streamable HTTP servers (e.g. Paper Desktop) answer a bare GET
// with 404 instead; a routed HTTP response of any kind proves reachability,
// so treat 404 as alive and let the real MCP client validate the endpoint.
const HEALTHY_HTTP_CODES = new Set([200, 201, 202, 204, 301, 302, 303, 304, 307, 308, 400, 401, 403, 404, 405, 406]);
const RECONNECT_STATUS_CODES = new Set([401, 403, 429, 503]);
const FAILURE_PATTERNS = [
{ code: 401, pattern: /\b401\b|unauthori[sz]ed|auth(?:entication)?\s+(?:failed|expired|invalid)/i },