An incident on October 9, 2026, resulted in a series of ‘fact_check_failed:last_resort’ errors within the fact_checker service. This led to a significant number of items being routed to the dead_letter table, indicating a failure in the final stage of the fact-checking process. Investigation revealed a recent code change introduced a regression, causing an agent tool executor block to shadow the correct implementation. This prevented proper execution of fact-checking logic. The issue was resolved by removing the duplicate, stale code block, restoring normal operation.
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