Teknium fcc05284fc fix(delegate): tool-activity-aware heartbeat stale detection (#13041) (#15183) ...

A child running a legitimately long-running tool (terminal command,
browser fetch, big file read) holds current_tool set and keeps
api_call_count frozen while the tool runs. The previous stale check
treated that as idle after 5 heartbeat cycles (~150s), stopped
touching the parent, and let the gateway kill the session.

Split the threshold in two:
- _HEARTBEAT_STALE_CYCLES_IDLE=5 (~150s)  — applied only when
  current_tool is None (child wedged between turns)
- _HEARTBEAT_STALE_CYCLES_IN_TOOL=20 (~600s) — applied when the child
  is inside a tool call

Stale counter also resets when current_tool changes (new tool =
progress). The hard child_timeout_seconds (default 600s) is still
the final cap, so genuinely stuck tools don't get to block forever.

2026-04-24 07:25:19 -07:00

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