The phaseWatchdog at 10s fired "STUCK phase=session.prompt" on every
healthy LLM call longer than 10 seconds. Verified via strace on the
running dogfood sf: bytes were actively flowing on the TLS socket
(fd 29) to the LLM provider while STUCK was being logged — the
session.prompt was never actually stuck, the watchdog was just
diagnostic-only and oblivious to stream activity.
The noOutputTimeoutMs watchdog (set to 60s for triage in commit
d80060fec) is the actual kill mechanism. It is already event-aware:
every meaningful subagent event resets the timer via armNoOutputTimer
+ isMeaningfulSubagentOutputEvent. The 10s STUCK warning was added
in commit 67e5ac9db as investigation infrastructure for the
sf-mp8e02m1-zpk903 family of bugs, but now it is just noise that
makes legitimate 30-200s LLM responses look broken.
Keeps the 10s STUCK watchdog for the three setup phases
(resourceLoader.reload, createAgentSession, bindExtensions) where
10s of silence is a real hang signal — those phases normally run in
sub-second.
Also includes:
- biome.json: bump $schema URL from 2.4.14 to 2.4.15 to match the
current biome CLI (clears the deserialize warning)
- scripts/check-test-imports.{,test.}mjs: format + drop a useless
regex escape that biome flagged in landed code
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
f55d490e1d