The runtime assembled-prompt scan (#3968 lineage) selected its pattern
tier on has_skills alone. A script-driven, no-skills job injects its
script's stdout into the prompt, and that blob was scanned with the
STRICT user-prompt pattern set — so any command-shape string in the
data feed (e.g. a triage bot ingesting a bug report that quotes
`rm -rf /`) hard-blocked the job on every tick.
Script output and context_from output are runtime DATA produced by
operator-authored code — the same trust class as install-vetted skill
markdown, not a user-authored directive prompt. Select the scan tier by
what the assembled prompt CONTAINS: when it includes skill content OR
injected data, use the looser _scan_cron_skill_assembled set (keeps
unambiguous injection directives, drops command-shape patterns,
sanitizes invisible unicode instead of blocking).
Defense-in-depth is preserved:
- The raw user prompt is still strict-scanned at create/update
(api_server paths untouched) AND re-scanned strict at runtime even
when the looser tier was selected for the data blob.
- Plain no-script/no-skills jobs keep the strict scan on the whole
assembled prompt.
- Injection directives arriving via script stdout still block.
Rejected alternative: removing destructive_root_rm from the strict set
or a per-job skip_injection_scan flag — both weaken the guard globally.