probe-nonstandard-fields SKILL.md skillA
probe-nonstandard-fields from agent-ecosystem/agent-skill-implementation is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add agent-ecosystem/agent-skill-implementation/probe-nonstandard-fields@git:20260321.ac05438Pins git:20260321.ac05438 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- agent-ecosystem/agent-skill-implementation
- Path
benchmark-skills/probe-nonstandard-fields/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260321.ac05438, committed Mar 21, 2026
- Size
- 1,171 bytes
- Repository stars
- 6
- License
- CC-BY-4.0
Benchmark skill for testing how platforms handle nonstandard frontmatter fields. Use when asked to probe nonstandard fields.
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
# Nonstandard Fields Probe
This skill uses frontmatter fields that are NOT in the Agent Skills
specification: `requires`, `depends-on`, and `priority`. It tests whether
any platform recognizes and acts on these fields.
## Instructions
When activated, report:
1. **Field visibility**: Can you see the nonstandard frontmatter fields
(`requires`, `depends-on`, `priority`)? If so, list their values.
2. **Platform behavior**: Did the platform do anything with these fields?
For example:
- Did it attempt to load `probe-loading` based on the `requires` field?
- Did it attempt to load `probe-shadow-alpha` and `probe-shadow-beta`
based on the `depends-on` field?
- Did it order skills or change behavior based on `priority`?
- Or were the fields silently ignored?
3. **Validation**: Did the platform warn about unrecognized frontmatter
fields, or accept them silently?Read the whole file at its exact version.
How to install
mdr add agent-ecosystem/agent-skill-implementation/probe-nonstandard-fields@sha256:a5c282c6ca784413The line at the top of this page pins the label git:20260321.ac05438, 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_iyi5ejzatqqivq6m)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Mar 21, 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 (1171 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-ecosystem/agent-skill-implementation · 6 stars · license CC-BY-4.0 · pushed 2026-09-27 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_iyi5ejzatqqivq6m GET https://markdownregistry.com/api/v1/resolve?ref=agent-ecosystem/agent-skill-implementation/probe-nonstandard-fields GET https://markdownregistry.com/api/v1/blob/a5c282c6ca7844135e3f87d31c426c6835e3d26258de4b9ed412aa182139047e
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.