hunt-shadow-api SKILL.md skillA
hunt-shadow-api from novaestellar/novahaku is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add novaestellar/novahaku/hunt-shadow-api@git:20260910.546fe86Pins git:20260910.546fe86 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- novaestellar/novahaku
- Path
testing/hunt/hunt-shadow-api/SKILL.md- Versions recorded
- 3
- Latest version
- git:20260910.546fe86, committed Sep 10, 2026
- First version recorded
- Sep 3, 2026
- Size
- 8,404 bytes
- Repository stars
- 28
- License
- MIT
Hunt shadow / zombie / undocumented API surface (OWASP API9 Improper Inventory Management) — enumerate the full API version history (v1/v2/beta/legacy paths, header- and subdomain-based versioning), pull and diff every reachable OpenAPI/Swagger spec (including ones only findable via the Wayback Machine), and behaviorally diff old vs. current versions for auth/rate-limit/validation regressions rather than just response-shape differences. Distinct from hunt-api-misconfig, which owns exploitation…
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
## OWASP API9 — Improper Inventory Management (Shadow / Zombie APIs) As an API evolves, old versions and internal/staging routes routinely stay reachable without receiving the same security fixes as the current version — because nobody tracks that they still exist. The bug is rarely in one endpoint; it's in the **delta** between what an old version enforces and what the current version enforces on the same operation. ### When to use Trigger when: - Versioned paths are visible (`/v1/`, `/v2/`, `/api/2023-01-01/`) or `Accept`/`X-API-Version` headers are in play. - A changelog, release notes, or deprecation notice references removed/old API behavior. - A mobile APK/IPA (via `apk-redteam-pipeline` / `ios-redteam-pipeline`) hardcodes endpoints that look like an older backend version than the current web app calls. - Multiple OpenAPI/Swagger specs are discoverable, or `info.version` in one spec implies others exist. DO NOT use for single-version APIs with no version history — there's nothing to diff; go straight to `hunt-api-misconfig` for direct exploitation of the one surface that exists. --- ## Stage 1 — Enumerate the Full Version Surface ```bash # Path-based versioning …
Read the whole file at its exact version.
How to install
mdr add novaestellar/novahaku/hunt-shadow-api@sha256:69ea8a122bb1b0d4The line at the top of this page pins the label git:20260910.546fe86, 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_dcctz2ocvbd7o7wa)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Sep 3, 2026 and Sep 10, 2026, about one every 3 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260910.546fe86 latest | 2026-09-10 | 546fe86 | 8,404 B | A | view · diff |
| git:20260903.29924dd | 2026-09-03 | 29924dd | 8,416 B | A | view · diff |
| git:20260903.fa855c4 | 2026-09-03 | fa855c4 | 8,387 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (8404 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 curl or wget piped into a shell
- 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
Source
novaestellar/novahaku · 28 stars · license MIT · pushed 2026-09-28 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_dcctz2ocvbd7o7wa GET https://markdownregistry.com/api/v1/resolve?ref=novaestellar/novahaku/hunt-shadow-api GET https://markdownregistry.com/api/v1/blob/69ea8a122bb1b0d4ba02b34238e5b637987c80965ee7bc287371b919c8ff0b60
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.