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fix(session): prevent silent overflow on parent thread forks (#26912)

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Lands #26912 from @markshields-tl with configurable session.parentForkMaxTokens and docs/tests/changelog updates.

Co-authored-by: Mark Shields <239231357+markshields-tl@users.noreply.github.com>
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Peter Steinberger
2026-02-25 23:53:43 +00:00
parent 8d1481cb4a
commit eb73e87f18
11 changed files with 211 additions and 14 deletions
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docs/reference/session-management-compaction.md
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@@ -128,6 +128,7 @@ Rules of thumb:
- **Reset** (`/new`, `/reset`) creates a new `sessionId` for that `sessionKey`.
- **Daily reset** (default 4:00 AM local time on the gateway host) creates a new `sessionId` on the next message after the reset boundary.
- **Idle expiry** (`session.reset.idleMinutes` or legacy `session.idleMinutes`) creates a new `sessionId` when a message arrives after the idle window. When daily + idle are both configured, whichever expires first wins.
- **Thread parent fork guard** (`session.parentForkMaxTokens`, default `100000`) skips parent transcript forking when the parent session is already too large; the new thread starts fresh. Set `0` to disable.
Implementation detail: the decision happens in `initSessionState()` in `src/auto-reply/reply/session.ts`.