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Agent skill

Artifact Validator

by jeremylongshore in jeremylongshore/tons-of-skills-marketplace

Discover and validate Agent Skills, host plugins and subagents, MCP servers and configurations, hooks, and marketplace catalogs against the correct authority.

MITAuto-check passedAgent Workflows

Install Artifact Validator

skills CLI
$ npx skills add jeremylongshore/tons-of-skills-marketplace --skill artifact-validator -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install jeremylongshore/tons-of-skills-marketplace artifact-validator --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/jeremylongshore/tons-of-skills-marketplace.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/.curated/artifact-validator .claude/skills/artifact-validator && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
artifact-validator
GitHub stars
2.8k
Token cost
~1.2k tokens
SKILL.md length
481 words
Files
4 (incl. scripts, references)
Skills in repo
3,342
Repo updated
First seen
Licence
MIT

At a glance

Discover and validate Agent Skills, host plugins and subagents, MCP servers and configurations, hooks, and marketplace catalogs against the correct authority.

  • Works in 8 steps: Read project instructions, inspect… → Run the offline inventory helper → Use references/validation-routing.md to → …
  • Performing pre-merge review
  • SKILL.md covers Overview, When to use, Prerequisites and Instructions, plus 4 more sections
  • Runs Python scripts from its folder; calls python3

What it does

Artifact Validator is an agent skill from jeremylongshore/tons-of-skills-marketplace. Discover and validate Agent Skills, host plugins and subagents, MCP servers and configurations, hooks, and marketplace catalogs against the correct authority. Use when performing pre-merge review, external submission checks, portability audits, security checks, or validation of mixed agent-system repositories. Trigger with "validate this skill", "audit this plugin", "check this agent", "review this MCP config", or "is this marketplace ready".

Its SKILL.md is about 1.2k tokens, which your agent loads only when the skill is triggered. The skill folder holds 5 other files, including scripts and reference files (for example `eval-spec.yaml`, `references/validation-routing.md` and `scripts/inventory_artifacts.py`). Compatibility notes: Agent Skills-compatible hosts; validation depth depends on available authoritative tooling

It sits in Agent Workflows, covering MCP servers. It works with Model Context Protocol. The repository describes itself as: Model-agnostic agent-skills platform with a harness-free canonical layer, verified adapters, and the ccpi package manager. Explore at tonsofskills.com. The licence is MIT.

When your agent uses it

  • Performing pre-merge review
  • External submission checks
  • Portability audits
  • Security checks

Example prompts

  • “validate this skill”
  • “audit this plugin”
  • “check this agent”
  • “/artifact-validator”

Requirements

  • Python 3
  • Compatibility (from SKILL.md): Agent Skills-compatible hosts; validation depth depends on available authoritative tooling
  • Pre-approved tools (allowed-tools): Read

Workflow steps

8 steps, taken from the first numbered list in SKILL.md.

  1. Read project instructions, inspect repository status, and determine whether
  2. Run the offline inventory helper
  3. Use references/validation-routing.md to
  4. In the Tons of Skills repository
  5. Validate structure, references, declared versus used capabilities, secret
  6. For behavior, require positive, negative, edge, and adversarial cases. A
  7. Reproduce automated-review findings independently. Reject or qualify any
  8. Return a severity-ordered report with exact paths, evidence, authority,

What it can do on your machine

Read from SKILL.md and the folder at commit cfae287. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves these tools, so the agent can use them without asking each time:

    • Read

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Ships 1 file in scripts/ (Python), which the agent can run.

    Shell commands in SKILL.md call:

    • python3

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

  • Compatibility

    Agent Skills-compatible hosts; validation depth depends on available authoritative tooling

    From compatibility in the SKILL.md frontmatter.

Context cost

Artifact Validator loads about 1.2k tokens when it runs, and up to ~1.8k if it reads all its reference files. Until then it costs about 116 tokens; SKILL.md has 481 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~116
When it runs · the whole SKILL.md, loaded when a task matches
~1.2k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~1.8k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.

SKILL.md

The full file from jeremylongshore/tons-of-skills-marketplace at commit cfae287, republished under its MIT licence (© jeremylongshore). 481 words, ~1,172 tokens.

Download SKILL.mdSave it as .claude/skills/artifact-validator/SKILL.md (or your agent's skills folder). This skill also uses 3 other files; get the full folder from GitHub.
name
artifact-validator
description
Discover and validate Agent Skills, host plugins and subagents, MCP servers and configurations, hooks, and marketplace catalogs against the correct authority. Use when performing pre-merge review, external submission checks, portability audits, security checks, or validation of mixed agent-system repositories. Trigger with "validate this skill", "audit this plugin", "check this agent", "review this MCP config", or "is this marketplace ready".
allowed-tools
Read
compatibility
Agent Skills-compatible hosts; validation depth depends on available authoritative tooling
version
1.0.0
author
Jeremy Longshore <jeremy@intentsolutions.io>
license
MIT
tags
agent-skills, validation, plugins, agents, mcp, security

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:

    bash
    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.

Show full SKILL.md (166 more words)Show less

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.

© jeremylongshore, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 3 other files (scripts, references) in skills/.curated/artifact-validator of jeremylongshore/tons-of-skills-marketplace.

  • SKILL.md
  • eval-spec.yaml
  • references/validation-routing.md
  • scripts/inventory_artifacts.py

Open the folder on GitHubat commit cfae287

Compare with similar skills

Artifact Validator next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Artifact Validator compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Artifact Validator this skilljeremylongshore/tons-of-skills-marketplace2.8k—~1.2kAutomated safety check: PassMIT
MCP Server Builderanthropics/skills180k63 repos~2.3kAutomated safety check: PassApache-2.0
MCP Server BuildershareAI-lab/learn-claude-code78k4 repos~1.2kAutomated safety check: PassMIT
MCP Integration for Pluginsanthropics/claude-plugins-official38k11 repos~3.1kAutomated safety check: PassApache-2.0
Crush Configurationcharmbracelet/crush29k—~3.7kAutomated safety check: PassCustom licence
Context Mode Output Sandboxmksglu/context-mode26k—~4.1kAutomated safety check: PassCustom licence

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Works with

Categories

Questions about Artifact Validator

What does Artifact Validator do?

Discover and validate Agent Skills, host plugins and subagents, MCP servers and configurations, hooks, and marketplace catalogs against the correct authority. Artifact Validator is an agent skill from jeremylongshore/tons-of-skills-marketplace. Discover and validate Agent Skills, host plugins and subagents, MCP servers and configurations, hooks, and marketplace catalogs against the correct authority.

When should I use Artifact Validator?

Artifact Validator fits situations like: performing pre-merge review; external submission checks; portability audits; security checks.

How do I install Artifact Validator in Claude Code?

Run `npx skills add jeremylongshore/tons-of-skills-marketplace --skill artifact-validator -a claude-code`. Or copy the skill folder (skills/.curated/artifact-validator in jeremylongshore/tons-of-skills-marketplace) into .claude/skills/artifact-validator in your project. Claude Code loads it when a task matches its description.

How do I install Artifact Validator in Codex?

Run `npx skills add jeremylongshore/tons-of-skills-marketplace --skill artifact-validator -a codex`. Or copy the skill folder (skills/.curated/artifact-validator in jeremylongshore/tons-of-skills-marketplace) into .agents/skills/artifact-validator in your project. Codex loads it when a task matches its description.

Can I use Artifact Validator in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add jeremylongshore/tons-of-skills-marketplace --skill artifact-validator -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/artifact-validator, .gemini/skills/artifact-validator, .github/skills/artifact-validator and .opencode/skills/artifact-validator in your project.

What does Artifact Validator need to run?

Going by SKILL.md and its folder, Artifact Validator needs Python for the scripts in its folder and the command-line tools its instructions call (python3). Our summary lists: Python 3. Its frontmatter pre-approves these tools: Read. Compatibility (from SKILL.md): Agent Skills-compatible hosts; validation depth depends on available authoritative tooling.

Does Artifact Validator access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Artifact Validator safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.

What licence does Artifact Validator use?

Artifact Validator is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Artifact Validator use?

About 1.2k tokens (SKILL.md is roughly 4.7k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 627 tokens, read only when the agent opens those files.

What are the alternatives to Artifact Validator?

Skills that share tags, products or a category with Artifact Validator: MCP Server Builder (anthropics/skills, 180k stars), MCP Server Builder (shareAI-lab/learn-claude-code, 78k stars), MCP Integration for Plugins (anthropics/claude-plugins-official, 38k stars) and Crush Configuration (charmbracelet/crush, 29k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Artifact Validator?

jeremylongshore (a GitHub user) maintains it in jeremylongshore/tons-of-skills-marketplace, which has 2,827 GitHub stars. The repository holds 3,342 skills in this directory. The repository was last updated on October 10, 2026.

Source: jeremylongshore/tons-of-skills-marketplace on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.