agt-security SKILL.md skillA
agt-security from richfrem/agent-plugins-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add richfrem/agent-plugins-skills/agt-security@git:20261024.3106a82Pins git:20261024.3106a82 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- richfrem/agent-plugins-skills
- Path
plugins/agent-orchestration/.apm/skills/agt-security/SKILL.md- Versions recorded
- 1
- Latest version
- git:20261024.3106a82, committed Oct 24, 2026
- Size
- 2,648 bytes
- Repository stars
- 7
- License
- MIT
Provides sandboxing validation, HMAC key rotation, and boundary verification to manage security boundaries under Microsoft Agent Governance Toolkit (AGT).
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
# Agent Governance Toolkit Security (`agt-security`) Manages local execution sandboxes, verifies process hygiene limits, and rotates cryptographic HMAC bus keys under Microsoft's Agent Governance Toolkit (AGT) security standards. ## Contents - [Critical Constraints](#critical-constraints) - [Quick start](#quick-start) - [Workflow](#workflow) - [Verification](#verification) - [References](#references) ## Critical Constraints - **Environment Hygiene**: Ensure banned execution variables (`PYTHONPATH`, `PYTHONHOME`, `LD_PRELOAD`, `DYLD_LIBRARY_PATH`) are scrubbed before subprocess launch. - **Path Containment**: Ensure filesystem operations outside declared root boundaries raise explicit `PermissionError` exceptions. - **Key Permission Enforcement**: HMAC session keys must be created exclusively with `0600` permissions inside protected secret storage (`context/exploration/.secrets/`). - **Zero Key Leakage**: Never print, log, or leak raw HMAC key bytes to stdout, telemetry, or conversational outputs. ## Quick start ```bash # Verify sandbox hygiene and path containment python3 scripts/agt_ops.py verify-sandbox # Rotate local HMAC session signing key …
Read the whole file at its exact version.
How to install
mdr add richfrem/agent-plugins-skills/agt-security@sha256:e142202d8b47a8e9The line at the top of this page pins the label git:20261024.3106a82, 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_7c47bsxbxzhbvu65)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Oct 24, 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 (2648 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
richfrem/agent-plugins-skills · 7 stars · license MIT · pushed 2026-11-04 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_7c47bsxbxzhbvu65 GET https://markdownregistry.com/api/v1/resolve?ref=richfrem/agent-plugins-skills/agt-security GET https://markdownregistry.com/api/v1/blob/e142202d8b47a8e9a91036e4b32a888e522b10c6c5f004da7bf08f3cfac1dae8
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.