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gstack's unattended /ship stops handing the parent agent a stale receipt

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gstack 1.91.214.0 to 1.91.215.0 (2026-10-25): an unattended /ship writes its receipt to a file the parent agent reads, and the parent checks the receipt against the branch instead of trusting an old pull request's receipt. gstack-brain-sync also finishes publishing removals without an unbound variable error and releases its sync lock. Changelog: https://github.com/garrytan/gstack/blob/main/CHANGELOG.md 1.91.214.0: https://github.com/garrytan/gstack/blob/main/CHANGELOG.md#1912140---2026-10-25 1.91.215.0: https://github.com/garrytan/gstack/blob/main/CHANGELOG.md#1912150---2026-10-25 Unattended runs: https://github.com/garrytan/gstack/blob/main/docs/unattended.md Commits: https://github.com/garrytan/gstack/commits/main

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Receipt

gstack’s unattended /ship stops handing the parent agent a stale receipt

UNATTENDED_SHIP: no push, no PR

receipt at .gstack/tmp/ship-receipt.md

parent agentreads the file

ReceiptStaleBrain syncVerdict

garrytan/gstack · CHANGELOG.md · 1.91.215.0

When a parent agent runs gstack's /ship unattended, the run never pushes, so there is no pull request to carry the receipt. Now the receipt lands in a file in the child's checkout, where the parent finds it.

Stale

An old pull request no longer passes for this run

beforeolder PR’s receipt · exit 0

nowreceipt head = branch head

With no PR at all, the parent got a usage error or RECEIPT_MISSING.

ReceiptStaleBrain syncVerdict

garrytan/gstack · CHANGELOG.md · 1.91.215.0

Before, the parent took the receipt from a pull request, and an older one passed without an error, carrying an out of date commit. Now the parent is told to match the receipt's commit to the branch every time.

Brain sync

Brain sync finishes clean after publishing removals

$ gstack-brain-sync --publish-removals --yes

list: unbound variable

temp list removedsync lock released

ReceiptStaleBrain syncVerdict

garrytan/gstack · CHANGELOG.md · 1.91.214.0

gstack-brain-sync no longer ends a removals publish on an unbound variable error. It now deletes its temp list and releases the sync lock, which used to linger until a later run cleared it.

Verdict

If a parent agent runs /ship for you, I would upgrade now

CHANGELOG.mdgarrytan/gstack

ReceiptStaleBrain syncVerdict

garrytan/gstack · CHANGELOG.md · 1.91.215.0

If a parent agent runs /ship for you in Claude Code, I would upgrade now: it stops trusting a receipt from an old pull request. The full notes are in the gstack changelog.