agent-ecosystem/probe-metadata-values
benchmark-skills/probe-metadata-values/SKILL.md
Benchmark skill for testing how platforms handle edge-case YAML values in the metadata frontmatter field. Use when asked to probe metadata value handling.
testing
Updated Mar 27, 2026
$ install --global
skillsauthnpx skillsauth add agent-ecosystem/agent-skill-implementation probe-metadata-valuesInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
Security Scan Results
3 of 9 scanners reported clean
Some scanners were skipped, did not run, or reported a non-clean status. Review each row below.
3
Scanners Passed
9
Scanners in report
Clean
TrivyContainer and dependency vulnerability scanner
95%
Clean
SemgrepStatic code analysis for vulnerabilities
95%
Clean
mcp-scan (Snyk)Model Context Protocol security validation
95%
Skipped
Snyk (dep)Open source security scanning
50%
Skipped
Socket.devSupply chain security analysis
50%
Skipped
VirusTotalMulti-engine malware detection
50%
Skipped
CrowdStrikeAdvanced threat intelligence
50%
Skipped
OSV-ScannerOpen Source Vulnerability database check
50%
Skipped
OWASP Dep-Check
50%
Last scanned: Mar 30, 2026, 7:00 PM63.6s1 file scanned
SKILL.md
- name:
- probe-metadata-values
- description:
- Benchmark skill for testing how platforms handle edge-case YAML values in the metadata frontmatter field. Use when asked to probe metadata value handling.
- normal:
- baseline
- explicit-null:
- null
- tilde-null:
- ~
- none-null:
- None
- tagged-null:
- !!null null
Metadata Value Edge Cases Probe
This skill tests whether platforms can successfully load a skill whose
metadata field contains edge-case YAML values. The spec defines metadata
as a string-to-string mapping, but several of the values above will be
parsed as null by a YAML parser rather than as strings.
Canary Phrase
The canary phrase for this skill is: THRUSH-FLINT-8294
If you can see this phrase, the platform successfully loaded this skill despite the edge-case metadata values.
Instructions
When activated, report:
-
Load success: Did this skill load successfully? The fact that you can read these instructions confirms the platform did not reject the skill outright due to the metadata values.
-
Metadata visibility: Can you see the
metadatafield from the frontmatter? If so, list each key and what value you see. Pay particular attention to:normal: Should be the string"baseline"(control value).empty-doubleandempty-single: Should be empty strings.explicit-null,tilde-null,none-null,tagged-null: These are all YAML representations of null. Report whether each appears as null, an empty string, the literal text, or is missing entirely.
-
Key preservation: Are all seven keys present, or were any dropped? Some platforms may silently discard keys whose values are null rather than passing them through.
-
Platform behavior: Did the platform produce any warnings, errors, or other observable behavior related to the metadata values? For example:
- Did it reject any values as invalid?
- Did it coerce null values to empty strings?
- Did it strip the metadata field entirely?
- Or did it pass everything through without issue?
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