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🤖 fix: verify-xum reads its launch time from node, and names chmod only for your own folders - #7919
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uutils date 0.8 ignores the width in %3N and prints nanoseconds, so t0=$(date +%s%3N) was 18-19 digits and no build stamp (Date.now(), in milliseconds) was ever newer: every launch failed at the deadline on a host where /usr/bin/date is uutils. Launch now takes t0 from node -p 'Date.now()', the same clock and unit as the stamp. --- _Generated with `xum` • Model: `anthropic:claude-opus-5-5` • Thinking: `xhigh` • Cost: `$213.46`_ <!-- mux-attribution: model=anthropic:claude-opus-5-5 thinking=xhigh costs=213.46 -->
A root-owned, group-writable folder above the git dir got the advice to chmod it, which fails for anyone but root. The refusal now names the chmod only for a folder of this user. For one you do not own, it says to use a checkout under folders you own, and SKILL.md says so too. --- _Generated with `xum` • Model: `anthropic:claude-opus-5-5` • Thinking: `xhigh` • Cost: `$213.46`_ <!-- mux-attribution: model=anthropic:claude-opus-5-5 thinking=xhigh costs=213.46 -->
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Summary
Every verify-xum launch on a host whose
/usr/bin/dateis uutils coreutils 0.8 failed at the 300 s deadline. This PR fixes that: launch now reads its start time fromnode -p 'Date.now()'. It also adds one #7917 advisor follow-up: thechmodfix in the git-dir refusal now appears only for a folder the user owns. Only files under.xum/skills/verify-xum/change.Background
t0).scripts/build-main-watch.jswrites that stamp asDate.now()in milliseconds.t0came fromdate +%s%3N.3in%3Nand prints nanoseconds. On this host,date +%s%3Nprinted1793814151776897404(19 digits).chmod g-w,o-w <folder>fix to the refusals for group-writable git dirs and the folders above them. For a folder the user does not own, such as a root-owned, group-writable folder above the checkout, that command fails with "Operation not permitted".Implementation
t0=$(node -p 'Date.now()')takes the stamp's own clock and unit.nodeis already a launch requirement.t0is the only millisecond timestamp in the skill. The run id'sdate -u +%Y%m%d-%H%M%Shas no width flag.require_safe_ancestors, a writable folder that the user does not own gets "use a checkout under folders you own" instead of thechmodfix.refusal_fixnow also prints a fix text that names no folder. SKILL.md says the same next to the umask 002 note.Validation
Launch on this host, with
VERIFY_XUM_READY_TIMEOUT=120, comparing main (96216fc) with this branch:dateon PATHdate +%s%3Nprints/usr/bin/date)/usr/bin/gnudate, linked asdateon PATH)Folder you do not own: a repo made under umask 002, below a root-owned 0775 folder (created with
sudofor the test).run chmod g-w,o-w $B/rootdirfor the root-owned folder. That command failed with "Operation not permitted", and every later run printed it again.chmodfix for the user's own.gitand repo folder, and those commands exit 0. For the root-owned folder it says "use a checkout under folders you own".Full token-mode proof of SKILL.md and every
features/*.mdrecipe, on this host with uutils date: 184 PASS, 0 FAIL at 15e96ea (and at d9ce137 before the merge of 🤖 fix: verify-xum names the umask fix, fails fast on a lost leader, keeps the guard from agent-browser #7917).make static-check, plus shellcheck 0.8.0 (CI's version) over all 46 shell scripts.Risks
The risk is low. Only the agent-facing verify-xum skill changes.
t0now comes from the same clock that writes the build stamp. The refusal change only alters the text of a message that already refuses.Generated with
xum• Model:anthropic:claude-opus-5-5• Thinking:xhigh• Cost:$213.46