invalid-agent-skill SKILL.md skillA
invalid-agent-skill from agent-sh/agnix is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add agent-sh/agnix/invalid-agent-skill@git:20260201.a695ec8Pins git:20260201.a695ec8 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- agent-sh/agnix
- Path
tests/fixtures/invalid/skills/invalid-agent/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260201.a695ec8, committed Feb 1, 2026
- First version recorded
- Feb 1, 2026
- Size
- 348 bytes
- Repository stars
- 472
- License
- Apache-2.0
Use when testing invalid agent validation.
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
This skill has an invalid agent type. Agent must be a built-in (Explore, Plan, general-purpose) or a custom kebab-case name. Invalid_Agent is rejected because underscores are not allowed; use hyphens for kebab-case format.
Read the whole file at its exact version.
How to install
mdr add agent-sh/agnix/invalid-agent-skill@sha256:5140d280b6be71fdThe line at the top of this page pins the label git:20260201.a695ec8, 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_fhqpgbz7v5enstnf)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, all committed on Feb 1, 2026.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260201.a695ec8 latest | 2026-02-01 | a695ec8 | 348 B | A | view · diff |
| git:20260201.57bf39f | 2026-02-01 | 57bf39f | 225 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 (348 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
agent-sh/agnix · 472 stars · license Apache-2.0 · pushed 2026-11-07 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_fhqpgbz7v5enstnf GET https://markdownregistry.com/api/v1/resolve?ref=agent-sh/agnix/invalid-agent-skill GET https://markdownregistry.com/api/v1/blob/5140d280b6be71fde0acfe2fb604122dc6ace55aa6e72d13f613f1214e644527
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.