aws-iam-patterns SKILL.md skillA
aws-iam-patterns from hermeticormus/libresecops-claude-code is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add hermeticormus/libresecops-claude-code/aws-iam-patterns@git:20260930.71a2663Pins git:20260930.71a2663 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- hermeticormus/libresecops-claude-code
- Path
plugins/cloud-security-aws/skills/aws-iam-patterns/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260930.71a2663, committed Sep 30, 2026
- First version recorded
- Feb 25, 2026
- Size
- 8,935 bytes
- Repository stars
- 4
- License
- MIT
AWS IAM reference: policy evaluation logic, policy types, least-privilege Lambda roles, permission boundaries, SCP guardrails, cross-account access with external ID, and IAM anti-patterns such as unconstrained PassRole. Use when writing or reviewing IAM policies.
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
# AWS IAM Patterns > Secure IAM policy patterns, least-privilege templates, and the policy evaluation logic that governs all AWS access control. ## Knowledge Base ### IAM Policy Evaluation Logic This is the most important concept in AWS security. Every API call is evaluated as follows: 1. **Explicit Deny** -- If ANY policy says Deny, the action is denied. Period. No override. 2. **Organizations SCP** -- If no SCP allows it, denied (SCPs are allowlists for member accounts). 3. **Resource-based policy** -- If a resource policy grants access, it can allow cross-account access without an identity policy (except for IAM roles in the same account). 4. **Identity-based policy** -- The policies attached to the user/role/group. 5. **Permissions boundary** -- If set, the effective permissions are the INTERSECTION of the identity policy and the boundary. 6. **Session policy** -- For assumed roles or federated users, further restricts to the intersection. 7. **Implicit Deny** -- If nothing explicitly allows it, denied. Understanding this chain is what separates a secure AWS environment from a breached one. ### Policy Types and When to Use Each | Policy Type | Attached To | Use Case | …
Read the whole file at its exact version.
How to install
mdr add hermeticormus/libresecops-claude-code/aws-iam-patterns@sha256:e436b004266e61ceThe line at the top of this page pins the label git:20260930.71a2663, 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_s7ihjovm26firdys)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Feb 25, 2026 and Sep 30, 2026, about one every 218 days. Its first recorded version is graded C and its latest A.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260930.71a2663 latest | 2026-09-30 | 71a2663 | 8,935 B | A | view · diff |
| git:20260225.4a0a620 | 2026-02-25 | 4a0a620 | 8,622 B | C | 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 (8935 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
hermeticormus/libresecops-claude-code · 4 stars · license MIT · pushed 2026-10-04 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_s7ihjovm26firdys GET https://markdownregistry.com/api/v1/resolve?ref=hermeticormus/libresecops-claude-code/aws-iam-patterns GET https://markdownregistry.com/api/v1/blob/e436b004266e61cec9e8aec4f4505fa5d4695071072450da16d178f1bf4613e5
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.