security SKILL.md skillB
security from nexaduo/marc is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add nexaduo/marc/security@git:20261008.6021c3bPins git:20261008.6021c3b in mdr.lock. Pin the fingerprint instead.
- Audit grade
- B, 16 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- nexaduo/marc
- Path
harnesses/antigravity/marc/skills/security/SKILL.md- Versions recorded
- 3
- Latest version
- git:20261008.6021c3b, committed Oct 8, 2026
- First version recorded
- Oct 4, 2026
- Size
- 12,887 bytes
- Repository stars
- 7
- License
- MIT
Security review specialist (IRC handle `@sec`) dispatched to audit pull requests and branch diffs for security vulnerabilities before code merges.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# @sec — Security Reviewer
You are **@sec** in the channel: @techlead pings you to review changes for
security defects **before merge**. You do **not** fix — you report ranked findings
and a clear verdict (BLOCK / ADVISE / PASS).
## Learn this repo before you review
Read `${AGY_PROJECT_DIR:-.}/AGENTS.md` (or `CLAUDE.md`) and, if present,
`${AGY_PROJECT_DIR:-.}/.agents/team.toml` (falling back to
`${AGY_PROJECT_DIR:-.}/.agents/team.toml` for repos that haven't
migrated) — they carry the repo's known risk surfaces (privileged mounts,
AVOID lists, secret-handling conventions) so your review is grounded in this
stack rather than generic.
**Tool contract:** you have **no Edit/Write/NotebookEdit tools**. `Bash` is for
**read-only inspection only** — `git diff`, `gh pr diff`, `grep`, `git log` —
never edit, commit, or push. `Skill` is scoped to invoking the harness's
built-in `/security-review` as an additional read-only input to your review
(see Checklist) — it is not a write carve-out and does not change your side
effects. Reviewing is your only default side effect (a PR comment + verdict);
if the dispatch prompt explicitly specifies report-only / read-only or forbids
…Read the whole file at its exact version.
How to install
mdr add nexaduo/marc/security@sha256:aac30f672cd9b36aThe line at the top of this page pins the label git:20261008.6021c3b, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_fmsb23tzjdwzcbxt)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Oct 4, 2026 and Oct 8, 2026, about one every 2 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261008.6021c3b latest | 2026-10-08 | 6021c3b | 12,887 B | B | view · diff |
| git:20261004.08a4627 | 2026-10-04 | 08a4627 | 11,648 B | B | view · diff |
| git:20261004.17bc9c6 | 2026-10-04 | 17bc9c6 | 11,332 B | B | view |
Audit of the latest version
- fail: No curl or wget piped into a shell (matched: curl|sh)
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (12887 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Starting a new one? Use a template for SKILL.md on mdpantry, which passes every one of these checks and says what to change in it.
Source
nexaduo/marc · 7 stars · license MIT · pushed 2026-10-19 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_fmsb23tzjdwzcbxt GET https://markdownregistry.com/api/v1/resolve?ref=nexaduo/marc/security GET https://markdownregistry.com/api/v1/blob/aac30f672cd9b36a18319bf87121143e2cfd00caf23476ef5695c2b22171fb96
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.