authorization-surface-mapping SKILL.md skillA
authorization-surface-mapping from annatchijova/skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add annatchijova/skills/authorization-surface-mapping@git:20260822.f25b32bPins git:20260822.f25b32b in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- annatchijova/skills
- Path
authorization-surface-mapping/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260822.f25b32b, committed Aug 22, 2026
- Size
- 10,415 bytes
- Repository stars
- 9
- License
- a license file GitHub does not identify
Build the actor × resource × action matrix a system implicitly claims to enforce, then test the cells it never wrote a test for — because authorization bugs are absences, and you cannot grep for an absence. Use whenever a system has more than one kind of user, more than one tenant, or any object with an owner — multi-tenant SaaS, admin panels, org/team/workspace models, RBAC or ABAC policy, sharing and invitation flows, API keys with scopes, service accounts, feature flags that gate privilege.…
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
# Authorization Surface Mapping Broken access control is the most-reported serious bug class in real systems, and it stays that way because of an asymmetry: a *present* check is visible in the diff, in the code, in the test suite. A *missing* check looks exactly like nothing. Reviewers read what is there. Attackers enumerate what should be there and is not. You cannot grep for an absence. You can only enumerate the grid the system implicitly promises to enforce and check the cells nobody thought about: > **actor × resource × action → allowed / denied.** > The bugs are in the cells the developers never imagined a request for. The second discipline of this skill is that **authorization is proven by the denial, not by the permission.** A test suite where every case passes as the rightful owner proves the feature works. It says nothing about access control. A green suite full of positive tests is the single most common reason an IDOR survives to production. Composes with the library: - **invariant-hunting** — takes one row of this matrix and asks whether the decision survives to the sink; this skill decides which rows exist …
Read the whole file at its exact version.
How to install
mdr add annatchijova/skills/authorization-surface-mapping@sha256:86f631e940337209The line at the top of this page pins the label git:20260822.f25b32b, 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_bj5javnxnsnubn53)
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Versions
The registry has recorded 1 version of this file, committed on Aug 22, 2026.
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 (10415 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
annatchijova/skills · 9 stars · license a license file GitHub does not identify · pushed 2026-11-02 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_bj5javnxnsnubn53 GET https://markdownregistry.com/api/v1/resolve?ref=annatchijova/skills/authorization-surface-mapping GET https://markdownregistry.com/api/v1/blob/86f631e940337209cd4a209b9c2ec399ad7be64b93894242ef075c19cb56e280
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.