Imported from jeremylongshore/tons-of-skills-marketplace (skills/.curated/artifact-validator/SKILL.md). Install upstream with npx skills add jeremylongshore/tons-of-skills-marketplace --skill artifact-validator. Copyright stays with the author (MIT).

Artifact Validator

Audit agent-system artifacts without changing them. Select authority by artifact type, run the strongest available deterministic checks, and separate observed facts from unsupported claims.

Overview

This skill is an orchestrator, not another schema authority. In the Tons of Skills repository it delegates to the repository's canonical validators. In other projects it applies the open specification floor and the target host's current contract, clearly labeling checks that could not be reproduced.

When to use

Use for a single file, plugin directory, marketplace, contributor change, or mixed repository. Use artifact-creator when changes are requested. Use production-upgrade when the audit must lead through research, implementation, migration, and release readiness.

Prerequisites

• A target path or repository.
• Read access to project instructions and generated-file ownership rules.
• Network access only when current primary-source verification is necessary. Never transmit private artifacts to an external validator without approval.

Instructions

1. Read project instructions, inspect repository status, and determine whether the target is generated, mirrored, canonical, or host-specific.

2. Run the offline inventory helper:

   python3 scripts/inventory_artifacts.py <target>

3. Use references/validation-routing.md to select the owner for each discovered artifact. Do not merge verdicts from different standards into one unexplained score.

4. In the Tons of Skills repository:

   • use scripts/validate-skills-schema.py for skill and agent authority;
   • use scripts/validate-mcp-config.mjs and the declared security gates for MCP configuration;
   • run catalog synchronization before judging generated projections;
   • keep kernel-shadow results advisory unless governance explicitly changes.

5. Validate structure, references, declared versus used capabilities, secret hygiene, path containment, bounded execution, provenance, license, and the evidence supporting every portability or production claim.

6. For behavior, require positive, negative, edge, and adversarial cases. A passing structural score does not prove runtime behavior or safety.

7. Reproduce automated-review findings independently. Reject or qualify any claim that lacks a command, primary source, fixture, or observable boundary.

8. Return a severity-ordered report with exact paths, evidence, authority, remediation options, and a PASS, FAIL, or NOT-VERIFIED verdict per artifact.

Output

Report the inventory, checks executed, exact command results, blocking findings, warnings, unverified surfaces, and overall claim ceiling. Do not collapse a partially tested multi-component plugin into a stronger verdict than its weakest component.

Error handling

• Missing authoritative tooling: perform the open-spec floor, mark deeper checks NOT-VERIFIED, and do not invent a pass.
• Unknown host artifact: identify it as host-specific and request or locate the current native specification before grading.
• Dirty or generated target: report ownership and drift; do not auto-fix during an audit.
• Secret-like content: redact the value, identify only the path and field, and stop any command that could transmit it.

Examples

• A valid SKILL.md with no behavioral evidence can pass structure while remaining NOT-VERIFIED for production behavior.
• A Claude plugin with five skills and one unchecked MCP server is capped by the MCP component's verdict.
• A portable skill claiming Pi, Hermes, or Goose support without registry-backed receipts is reported as compatible or unverified, not verified-native.

Resources

• Validation routing
• scripts/inventory_artifacts.py performs read-only deterministic discovery.