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feat(config): lower MCP timeouts and raise JSON body limit

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Reduce the default external-MCP silence timeout from 5 min to 1 min and the
overall call timeout from 15 min to 2 min. Update related tests and comments.
Increase Fastify's JSON body limit to 25 MiB (configurable via
HTTP_JSON_BODY_LIMIT) to accommodate large AI‑chat payloads.

BREAKING CHANGE: shorter MCP timeouts may abort long‑running tool calls that
previously succeeded with the older defaults.
This commit is contained in:
agent_vscode
2026-07-07 04:19:26 +03:00
parent f0afb2d729
commit 888c87f984
5 changed files with 45 additions and 23 deletions
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apps/server/src/integrations/ai/ai-streaming-fetch.ts
+7 -7
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@@ -123,19 +123,19 @@ export function streamKeepAliveMs(): number {
return positiveEnv('AI_STREAM_KEEPALIVE_MS', DEFAULT_STREAM_KEEPALIVE_MS);
}
/** Default SILENCE timeout for EXTERNAL-MCP transport (5 min). */
const DEFAULT_MCP_STREAM_TIMEOUT_MS = 300_000;
/** Default SILENCE timeout for EXTERNAL-MCP transport (1 min). */
const DEFAULT_MCP_STREAM_TIMEOUT_MS = 60_000;
/** Default total wall-clock cap for ONE external MCP tool call (15 min). */
const DEFAULT_MCP_CALL_TIMEOUT_MS = 900_000;
/** Default total wall-clock cap for ONE external MCP tool call (2 min). */
const DEFAULT_MCP_CALL_TIMEOUT_MS = 120_000;
/**
* SILENCE timeout (ms) for EXTERNAL-MCP transport ONLY. Override with
* `AI_MCP_STREAM_TIMEOUT_MS`; a missing/invalid/non-positive value falls back to
* {@link DEFAULT_MCP_STREAM_TIMEOUT_MS} (5 min).
* {@link DEFAULT_MCP_STREAM_TIMEOUT_MS} (1 min).
*
* Deliberately tighter than the chat provider's {@link streamTimeoutMs} (15 min)
* so a byte-silent/hung MCP upstream is broken in ~5 min instead of 15. This is
* so a byte-silent/hung MCP upstream is broken in ~1 min instead of 15. This is
* the undici `headersTimeout`/`bodyTimeout` for the external-MCP dispatcher only
* — it must NOT change the chat provider, which legitimately needs 15 min between
* reasoning chunks (#175).
@@ -153,7 +153,7 @@ export function mcpStreamTimeoutMs(): number {
/**
* Total wall-clock cap (ms) for ONE external MCP tool call — APP-LEVEL, not
* transport. Override with `AI_MCP_CALL_TIMEOUT_MS`; a missing/invalid/
* non-positive value falls back to {@link DEFAULT_MCP_CALL_TIMEOUT_MS} (15 min).
* non-positive value falls back to {@link DEFAULT_MCP_CALL_TIMEOUT_MS} (2 min).
*
* Catches a tool that keeps the connection warm (SSE heartbeats / trickle) but
* never returns a result — which the transport silence timeout