aegis-firewall-edge SKILL.md skillB
aegis-firewall-edge 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-firewall-edge@git:20260826.9702747Pins git:20260826.9702747 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- B, 16 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- as-foss/aegis-skills
- Path
skills/server/firewall-edge/SKILL.md- Versions recorded
- 3
- Latest version
- git:20260826.9702747, committed Aug 26, 2026
- First version recorded
- Aug 25, 2026
- Size
- 38,897 bytes
- Repository stars
- 16
- License
- Apache-2.0
Audits host firewall state and network-edge exposure on Linux hosts — listener inventory and wildcard bindings, nftables/iptables/ufw/firewalld default-deny design, egress filtering, IPv6 parity, L4 rate limiting, admin-plane isolation, Docker NAT bypass, and cloud security-group reconciliation — with read-only evidence commands and hardened reference rulesets.
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 one running Linux host's network edge (or its config-as-code). Eight domains, in priority order: 1. **Exposure inventory** — every TCP/UDP listener mapped to bound address, service, user; classified internet-reachable vs loopback-only vs link-local; wildcard (`0.0.0.0` / `[::]`) bindings that should be loopback. 2. **Firewall state** — which of nftables / iptables / ufw / firewalld is actually active (or none), default policies, rule density per chain. 3. **Default-deny design** — inbound policy drop with explicit allows; drop logging with rate limiting; correct syntax for all three management layers. 4. **Egress filtering** — outbound control for SSRF exfil, reverse shells, data theft; staged log-only rollout. 5. **IPv6 parity** — v6 filtered at least as tightly as v4; NDP/RA permitted. 6. **L4 rate limiting & brute-force protection** — connection/rate meters at the firewall plus fail2ban jails for sshd and nginx auth failures. 7. **Admin-plane isolation** — SSH, DB admin, monitoring agents reachable only from VPN/bastion CIDR; lockout-safe change procedure. …
Read the whole file at its exact version.
How to install
mdr add as-foss/aegis-skills/aegis-firewall-edge@sha256:78304faf592a4490The 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_fakp4ll6c2mwf6se)
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 | 38,897 B | B | view · diff |
| git:20260825.85624bc | 2026-08-25 | 85624bc | 38,898 B | B | view · diff |
| git:20260825.244c198 | 2026-08-25 | 244c198 | 37,917 B | B | view |
Audit of the latest version
- fail: No link to a raw IP address (matched: http://169.254.169.254)
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (38897 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 script tag
Starting a new one? Use a template for SKILL.md on mdpantry, which passes every one of these checks and says what to change in it.
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_fakp4ll6c2mwf6se GET https://markdownregistry.com/api/v1/resolve?ref=as-foss/aegis-skills/aegis-firewall-edge GET https://markdownregistry.com/api/v1/blob/78304faf592a44907c1b6b294d80cb26c2572133a57c76db1424262e5fb2eb79
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.