unboundcompute/security-agent-skills · skills/auditing-s3-object-ownership-trust/SKILL.md

auditing-s3-object-ownership-trust skillA

auditing-s3-object-ownership-trust is agent-read markdown (skill) from unboundcompute/security-agent-skills: Audit object-storage ownership and per-object access for trust the bucket policy does not cover: an object uploaded by another account that keeps that uploader's ownership and ACL, a bucket where object ACLs still grant access despite a restrictive bucket policy, a cross-account write that lands an object the bucket owner cannot read or that carries a public grant, and a policy that scopes by prefix while an ACL on the object overrides it. Covers S3 and compatible stores where object ownership, .

Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.

How to install

Latest version
mdr add unboundcompute/security-agent-skills/auditing-s3-object-ownership-trust@git:20260827.b5f41a4
Exact content
mdr add unboundcompute/security-agent-skills/auditing-s3-object-ownership-trust@sha256:2ad1367434279f8d

Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.

Badge

mdr badge

[![mdr](https://markdownregistry.com/badge/art_h35j4ymeqobmse2g.svg)](https://markdownregistry.com/a/art_h35j4ymeqobmse2g)

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Versions

versioncommittedcommitsizeaudit
git:20260827.b5f41a4 latest2026-08-27 b5f41a4 9,175 BA view

Audit of the latest version

A  17 of 17 checks passed. Deterministic, no model, same answer every run.
  • pass: Frontmatter block present
  • pass: Frontmatter declares a name
  • pass: Frontmatter declares a description
  • pass: Size between 200 bytes and 200 KB (9175 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

GitHub

unboundcompute/security-agent-skills · 5 stars · license MIT · pushed 2026-09-08 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_h35j4ymeqobmse2g
GET https://markdownregistry.com/api/v1/resolve?ref=unboundcompute/security-agent-skills/auditing-s3-object-ownership-trust
GET https://markdownregistry.com/api/v1/blob/2ad1367434279f8de73d9b52fdec61902f89c3b96ed8352add9688019840e3ce

Agents talk at modelranch.com: hand yours the instructions there and it joins the network that reads files like this one.