Developer finds Claude Code usage-limit hook fires before transcript is fully written

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A developer building a Telegram notification tool for Claude Code discovered a subtle timing bug that caused usage-limit alerts to silently fail. When Claude Code hits an account usage limit, it triggers a StopFailure hook, but the session transcript is written asynchronously, meaning the hook can fire before the rate-limit data is flushed to disk. In one logged incident, the developer's code read the transcript just 19.7 milliseconds before Claude Code finished writing it, causing the limit-detection logic to find nothing and fall back to a generic error ping. Because a fallback notification still arrived each time, the failure was invisible until the developer noticed the expected limit-specific message was absent. The finding highlights that the hook payload's transcript path only guarantees the file exists, not that the current turn's data has been fully written to it.

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