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refactor(circuit-breaker): replace sliding window with consecutive call detection

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Switch background task loop detection from percentage-based sliding window
(80% of 20-call window) to consecutive same-tool counting. Triggers when
same tool signature is called 20+ times in a row; a different tool resets
the counter.
This commit is contained in:
YeonGyu-Kim
2026-03-18 14:32:27 +09:00
parent c5c7ba4eed
commit d48ea025f0
8 changed files with 98 additions and 187 deletions
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src/features/background-agent/manager.ts
+2 -4
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@@ -932,18 +932,16 @@ export class BackgroundManager {
if (circuitBreaker.enabled) {
const loopDetection = detectRepetitiveToolUse(task.progress.toolCallWindow)
if (loopDetection.triggered) {
log("[background-agent] Circuit breaker: repetitive tool usage detected", {
log("[background-agent] Circuit breaker: consecutive tool usage detected", {
taskId: task.id,
agent: task.agent,
sessionID,
toolName: loopDetection.toolName,
repeatedCount: loopDetection.repeatedCount,
sampleSize: loopDetection.sampleSize,
thresholdPercent: loopDetection.thresholdPercent,
})
void this.cancelTask(task.id, {
source: "circuit-breaker",
reason: `Subagent repeatedly called ${loopDetection.toolName} ${loopDetection.repeatedCount}/${loopDetection.sampleSize} times in the recent tool-call window (${loopDetection.thresholdPercent}% threshold). This usually indicates an infinite loop. The task was automatically cancelled to prevent excessive token usage.`,
reason: `Subagent called ${loopDetection.toolName} ${loopDetection.repeatedCount} consecutive times (threshold: ${circuitBreaker.consecutiveThreshold}). This usually indicates an infinite loop. The task was automatically cancelled to prevent excessive token usage.`,
})
return
}