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Garry TanandClaude Fable 5
45b72989e6
The Stop hook runs on EVERY Claude Code turn machine-wide and re-read +
JSON-parsed the entire timeline each time, scaling to the 10MB size cap
(~100-300ms per turn of pure overhead). It now reads only the last 256KB
via fstat + positioned read, discarding the first partial line when the
window starts mid-file.
Semantics: a dangling "started" older than the last 256KB of appends
belongs to a session long gone — beyond repair interest. The window can
never fabricate a dangling entry ("completed" is always appended AFTER its
"started", so any started inside the window has its completion inside the
window too), so idempotency holds. The fail-open contract is unchanged:
exit 0 always, size cap kept, deadline re-checked before the write.
New test: a >256KB timeline where a recent dangling entry still gets
repaired while an old out-of-window dangler is left alone; all existing
fail-open cases pass unchanged.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>