aegis-linux-baseline SKILL.md skillA
aegis-linux-baseline from as-foss/aegis-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add as-foss/aegis-skills/aegis-linux-baseline@git:20260826.9702747Pins git:20260826.9702747 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- as-foss/aegis-skills
- Path
skills/server/linux-baseline/SKILL.md- Versions recorded
- 3
- Latest version
- git:20260826.9702747, committed Aug 26, 2026
- First version recorded
- Aug 25, 2026
- Size
- 49,418 bytes
- Repository stars
- 16
- License
- Apache-2.0
Audits Linux OS baseline hardening across accounts/sudo, sshd, PAM/password policy, kernel sysctl, filesystem permissions, boot/disk, and time sync, with exact read-only checks, hardened config blocks, and post-fix verification commands.
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
## Scope & Objectives Audit the operating-system identity and kernel baseline of one running Linux host (or its config-as-code). Seven domains, in priority order: 1. **Accounts & sudo** — UID-0 duplication, stale/unused accounts, empty passwords, sudo grant breadth, sudo brute-force throttling. 2. **SSH daemon** — effective `sshd_config` state, authentication methods, forwarding surface, key hygiene. 3. **PAM & password policy** — lockout, password quality, expiry, password hashing. 4. **Kernel & network sysctl** — anti-MITM, anti-DoS, information-disclosure and local-privesc-surface controls. 5. **Filesystem & permissions** — SUID/SGID inventory, world-writable artifacts, mount flags, cron/at gating, umask, core dumps. 6. **Boot & disk** — bootloader protection (contextual), encryption-at-rest presence, protected data mounts. 7. **Time sync** — NTP health; forensic prerequisite for every other module's evidence. Out of scope (cross-references): firewall/exposure map → FW; TLS/proxy edge → TLS; systemd sandboxing, SELinux/AppArmor *policy authoring*, container runtime → SANDBOX; secret contents/env files → HSECRET; patch level/EOL → PATCH; audit rules/log shipping → LOGMON. …
Read the whole file at its exact version.
How to install
mdr add as-foss/aegis-skills/aegis-linux-baseline@sha256:28598d5e0736f75eThe line at the top of this page pins the label git:20260826.9702747, 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_rdgdsijugzmk6thw)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Aug 25, 2026 and Aug 26, 2026, more than one a day.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260826.9702747 latest | 2026-08-26 | 9702747 | 49,418 B | A | view · diff |
| git:20260825.85624bc | 2026-08-25 | 85624bc | 49,419 B | A | view · diff |
| git:20260825.244c198 | 2026-08-25 | 244c198 | 48,546 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 (49418 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
as-foss/aegis-skills · 16 stars · license Apache-2.0 · pushed 2026-08-26 · branch master
API
GET https://markdownregistry.com/api/v1/artifacts/art_rdgdsijugzmk6thw GET https://markdownregistry.com/api/v1/resolve?ref=as-foss/aegis-skills/aegis-linux-baseline GET https://markdownregistry.com/api/v1/blob/28598d5e0736f75e2ba888545a6bb5278c3b43f604c89a697b5b6daa506c4f26
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.