fix(delegation): remove the default subagent wall-clock timeout (#45149)

Subagents doing legitimate heavy work (deep code reviews, research fan-outs, slow reasoning models) were routinely killed at the blanket 600s child_timeout_seconds cap while making steady progress (e.g. 36 API calls completed when the axe fell). Failures should come from what the child is actually doing — API errors, tool errors, iteration budget — not a delegation-level stopwatch. - DEFAULT_CHILD_TIMEOUT: 600 -> None; Future.result(timeout=None) blocks until the child finishes - config default delegation.child_timeout_seconds: 600 -> 0 (0/negative = disabled; positive opts back in, floor 30s unchanged) - stuck-child protection unchanged: the heartbeat staleness monitor still stops refreshing parent activity so the gateway inactivity timeout fires on a truly wedged worker; the 0-API-call diagnostic dump still works when a cap is configured - docs updated (EN + zh-Hans)
2026-06-12 12:58:25 -07:00
parent 9b01c4d193
commit bba9b519aa
4 changed files with 59 additions and 24 deletions
@@ -1760,10 +1760,11 @@ DEFAULT_CONFIG = {
        "inherit_mcp_toolsets": True,
        "max_iterations": 50,  # per-subagent iteration cap (each subagent gets its own budget,
                               # independent of the parent's max_iterations)
-        "child_timeout_seconds": 600,  # wall-clock timeout for each child agent (floor 30s,
-                                       # no ceiling). High-reasoning models on large tasks
-                                       # (e.g. gpt-5.5 xhigh, opus-4.6) need generous budgets;
-                                       # raise if children time out before producing output.
+        "child_timeout_seconds": 0,  # optional wall-clock cap per child agent. 0 (default)
+                                     # = no timeout: children fail only from real errors
+                                     # (API, tools, iteration budget), never a delegation
+                                     # stopwatch. Set a positive number of seconds
+                                     # (floor 30s) to enforce a hard cap.
        "reasoning_effort": "",  # reasoning effort for subagents: "xhigh", "high", "medium",
                                 # "low", "minimal", "none" (empty = inherit parent's level)
        "max_concurrent_children": 3,  # max parallel children per batch; floor of 1 enforced, no ceiling