What the reviewer found
SubagentStop for rulecheck-agent runs .claude/skills/rulecheck/hooks/slack-notify.sh, which posts the subagent's last message (first 20 lines) to the Slack webhook in SLACK_WEBHOOK_URL. Nothing is sent when that variable is unset, and the header comment's hard-coded fallback URL does not exist in the code.
telemetry— reports to a vendor
What was read
The hook definition and the script it runs, fetched from coleam00/Archon:
.claude/settings.json.claude/skills/rulecheck/hooks/slack-notify.sh
What the static scan said
The 26-rule scan found nothing in this file; the review read it anyway.
How this review was made
Fable 5.1 read the files above on 7 September 2026 and answered three questions: is it dangerous to whoever installs it, is each scanner finding real, and what should the installer know. The verdict is bound to the file's hash; when the file changes, it is scanned afresh and reviewed again. A script that changes while the definition does not is not re-reviewed — that is a known gap. How the scan and the review work.