What the reviewer found
An XXE penetration-testing playbook from a bug-bounty skills collection, describing attack techniques and candidate file-read targets for authorized testing rather than code the skill itself executes. The flagged HTML comment is inline documentation inside an example XML payload, not a hidden instruction to the agent.
dual-use— a security tool that can be misused
What was read
The file as it ships in SurrealSky/hack_skills:
skills/injection-checking/xxe-xml-external-entity/SKILL.md
What the static scan said
The scan flagged 3things. The reviewer kept 0 and dismissed 3 as false.
P2Hidden instructions — false positivePE3Reaches for credential files — false positiveSSRF1Cloud metadata endpoint — false positive
How this review was made
Sonnet 5 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.