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Raise the default MCP discovery timeout to 30 seconds #2317

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Raise the default MCP discovery timeout to 30 seconds #2317

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5 changes: 5 additions & 0 deletions .changeset/mcp-discovery-timeout-30s.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
"executor": patch
---

Wait up to 30 seconds, instead of 15, for an MCP server to connect and list its tools. Servers that cold-start or build a large tool catalog no longer show as degraded with `MCP discovery timed out after 15000ms`.
11 changes: 6 additions & 5 deletions packages/plugins/mcp/src/sdk/discover.ts
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Expand Up @@ -25,11 +25,12 @@ const MAX_LIST_TOOLS_PAGES = 100;
// carries a deadline of its own against a server that never answers (a
// closed/half-open loopback socket, a server wedged mid-handshake), so
// without a bound here a single unresponsive endpoint hangs the calling
// fiber forever. Mirrors the shape-probe fallback's default
// (`probeMcpEndpointShape`'s `timeoutMs = 8_000`) at a slightly longer
// bound since a real handshake + listTools round-trip is heavier than the
// shape probe's single unauth POST.
const DEFAULT_DISCOVER_TIMEOUT = Duration.seconds(15);
// fiber forever. Longer than the shape-probe fallback's default
// (`probeMcpEndpointShape`'s `timeoutMs = 8_000`) since a real handshake +
// listTools round-trip is heavier than the shape probe's single unauth POST,
// and generous enough for servers that cold-start or build a large tool
// catalog on first connect.
const DEFAULT_DISCOVER_TIMEOUT = Duration.seconds(30);

// Teardown is best-effort and paid for by the request that performed discovery.
// A remote transport may accept close and then never settle, so use the same
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