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fix: exponential backoff for rate-limit fallback cooldown #30223

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cicae wants to merge 1 commit into from
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fix: exponential backoff for rate-limit fallback cooldown #30223

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1 change: 1 addition & 0 deletions agent/agent_runtime_helpers.py
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Original file line number Diff line number Diff line change
Expand Up @@ -896,6 +896,7 @@ def restore_primary_runtime(agent) -> bool:
# ── Reset fallback chain for the new turn ──
agent._fallback_activated = False
agent._fallback_index = 0

@teknium1 teknium1 Jul 13, 2026

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restore_primary_runtime() runs before the restored primary has made a successful request. Resetting here means a primary that immediately 429s again always starts at the 30-minute tier, so the proposed exponential sequence never advances. Reset only after an actual successful primary completion.

agent._rate_limit_backoff_count = 0 # reset exponential backoff counter

logging.info(
"Primary runtime restored for new turn: %s (%s)",
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11 changes: 10 additions & 1 deletion agent/chat_completion_helpers.py
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Expand Up @@ -705,7 +705,16 @@ def try_activate_fallback(agent, reason: "FailoverReason | None" = None) -> bool
current_provider = (getattr(agent, "provider", "") or "").strip().lower()
primary_provider = ((agent._primary_runtime or {}).get("provider") or "").strip().lower()
if (not fallback_already_active) or (primary_provider and current_provider == primary_provider):
agent._rate_limited_until = time.monotonic() + 60
# Exponential backoff: 30min → 1h → 2h → 4h cap
# Counter is reset by restore_primary_runtime on successful restore.
backoff_count = getattr(agent, "_rate_limit_backoff_count", 0)
agent._rate_limit_backoff_count = backoff_count + 1
backoff_seconds = min(1800 * (2 ** backoff_count), 14400)
agent._rate_limited_until = time.monotonic() + backoff_seconds
logging.info(
"Rate-limit backoff level %d: cooldown %d s (%.1f min, backoff#%d)",
backoff_count, backoff_seconds, backoff_seconds / 60, backoff_count + 1,
)
if agent._fallback_index >= len(agent._fallback_chain):
return False

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