Dev Blog: Priority Probe Fix Rescues Posting Jobs Blocked by Circuit Breaker

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A software developer identified a flaw in their Claude API quota management tool where a circuit breaker halted all jobs uniformly during quota exhaustion, causing a posting job to run only 43% of the time. Engagement jobs consumed most of the quota first, effectively deprioritizing the time-sensitive posting job over the circuit breaker's open period. To fix this, the developer added a 'priority probe' mechanism in claude-quota-guard.py that allows designated high-priority jobs to attempt one real API request every 30 minutes even while the circuit remains open. Two implementation pitfalls were encountered during development, one of which silently dropped a daily job for four consecutive days between September 13 and 16, 2026. The probe also serves as an early-recovery detector, closing the circuit sooner when the API quota is restored before the preset cooldown period expires.

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