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Agent skill

Validate Plugin

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

Validate a Claude Code plugin directory against the official Anthropic spec and Intent Solutions enterprise standard.

MITAuto-check passedAgent Workflows

Install Validate Plugin

skills CLI
$ npx skills add jeremylongshore/tons-of-skills-marketplace --skill validate-plugin -a claude-code

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

GitHub CLI
$ gh skill install jeremylongshore/tons-of-skills-marketplace validate-plugin --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/validate-plugin .claude/skills/validate-plugin && 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
validate-plugin
GitHub stars
2.8k
Token cost
~713 tokens
SKILL.md length
193 words
Files
2 (incl. references)
Skills in repo
3,342
Repo updated
First seen
Licence
MIT

At a glance

Validate a Claude Code plugin directory against the official Anthropic spec and Intent Solutions enterprise standard.

  • Works in 2 steps: validate-all-plugins.sh for structural… → validate-skills-schema.py for content…
  • Building a new plugin
  • SKILL.md covers Overview, Prerequisites, Instructions and Output, plus 3 more sections
  • Calls python3

What it does

Validate Plugin is an agent skill from jeremylongshore/tons-of-skills-marketplace. Validate a Claude Code plugin directory against the official Anthropic spec and Intent Solutions enterprise standard. Runs structural validation (plugin.json fields, file references, permissions) and content validation (SKILL.md grading, command/agent frontmatter). Use when building a new plugin, preparing for marketplace submission, or auditing existing plugins. Trigger with "validate this plugin", "check plugin structure", "grade my plugin", "/validate-plugin".

Its SKILL.md is about 710 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including reference files (for example `references/plugin-schema.md`). Compatibility notes: Designed for Claude Code

It sits in Agent Workflows, covering Hooks and plugins. 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

  • Building a new plugin
  • Preparing for marketplace submission
  • Auditing existing plugins
  • With validate this plugin

Example prompts

  • “validate this plugin”
  • “check plugin structure”
  • “grade my plugin”
  • “/validate-plugin”

Requirements

  • Python 3
  • Compatibility (from SKILL.md): Designed for Claude Code
  • Pre-approved tools (allowed-tools): Read, Bash(python3:*), Bash(jq:*), Bash(chmod:*), Glob, Grep

Workflow steps

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

  1. validate-all-plugins.sh for structural validation (plugin.json, file refs, permissions)
  2. validate-skills-schema.py for content validation with 100-point grading

What it can do on your machine

Read from SKILL.md and the folder at commit 23ea8d4. 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
    • Bash(python3:*)
    • Bash(jq:*)
    • Bash(chmod:*)
    • Glob
    • Grep

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • python3

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

  • Network

    Links to these hosts (documentation or services it may open):

    • code.claude.com

    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

    Designed for Claude Code

    From compatibility in the SKILL.md frontmatter.

Context cost

Validate Plugin loads about 713 tokens when it runs, and up to ~4.1k if it reads all its reference files. Until then it costs about 121 tokens; SKILL.md has 193 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~121
When it runs · the whole SKILL.md, loaded when a task matches
~713
With references · SKILL.md plus every file in references/, read only if the agent opens them
~4.1k

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); files beside SKILL.md are not scanned.

SKILL.md

The full file from jeremylongshore/tons-of-skills-marketplace at commit 23ea8d4, republished under its MIT licence (© jeremylongshore). 193 words, ~713 tokens.

Download SKILL.mdSave it as .claude/skills/validate-plugin/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
validate-plugin
description
Validate a Claude Code plugin directory against the official Anthropic spec and Intent Solutions enterprise standard. Runs structural validation (plugin.json fields, file references, permissions) and content validation (SKILL.md grading, command/agent frontmatter). Use when building a new plugin, preparing for marketplace submission, or auditing existing plugins. Trigger with "validate this plugin", "check plugin structure", "grade my plugin", "/validate-plugin".
allowed-tools
Read, Bash(python3:*), Bash(jq:*), Bash(chmod:*), Glob, Grep
compatibility
Designed for Claude Code
version
1.8.0
author
Jeremy Longshore <jeremy@intentsolutions.io>
license
MIT
user-invocable
true
argument-hint
<plugin-directory-path>
tags
skill-development, audit, validate-plugin

Validate Plugin

Full plugin directory validator combining structural checks and content grading.

Overview

Runs the complete validation pipeline against any plugin directory:

  1. validate-all-plugins.sh for structural validation (plugin.json, file refs, permissions)
  2. validate-skills-schema.py for content validation with 100-point grading

Prerequisites

  • Python 3 with pyyaml installed
  • jq available on PATH
  • Run from the claude-code-plugins repository root

Instructions

  1. Identify the target plugin directory (must contain .claude-plugin/plugin.json)

  2. Run structural validation:

    bash
    ./scripts/validate-all-plugins.sh <plugin-directory>

  3. Run content validation on any SKILL.md files found:

    bash
    python3 scripts/validate-skills-schema.py --verbose <path-to-SKILL.md>

  4. If the plugin has commands or agents, validate those too:

    bash
    python3 scripts/validate-skills-schema.py --verbose

  5. Report the combined results with per-skill 100-point grades

Output

Present results in this format:

Structural Validation:

  • plugin.json: PASS/FAIL (list any invalid fields)
  • File references: PASS/FAIL
  • Script permissions: PASS/FAIL

Content Validation (per SKILL.md):

  • Grade: A-F (score/100)
  • Errors: list
  • Warnings: list

Summary:

  • Total errors / warnings
  • Overall verdict: PASS or FAIL

Error Handling

  • If plugin directory doesn't exist, report and exit
  • If plugin.json is missing, report as structural failure
  • If Python or jq not available, report as environment issue
  • Continue validating remaining files even if one fails

Examples

Example 1: Validate a specific plugin

/validate-plugin plugins/skill-enhancers/skill-creator/

Example 2: Validate current directory

validate this plugin

Resources

© 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 1 other file (references) in skills/.curated/validate-plugin of jeremylongshore/tons-of-skills-marketplace.

  • SKILL.md
  • references/plugin-schema.md

Open the folder on GitHubat commit 23ea8d4

Compare with similar skills

Validate Plugin 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.

Validate Plugin compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Validate Plugin this skilljeremylongshore/tons-of-skills-marketplace2.8k—~713Automated safety check: PassMIT
Hook Development for Claude Code Pluginsanthropics/claude-plugins-official38k11 repos~4.1kAutomated safety check: NotesApache-2.0
Claude Code Agent Developmentanthropics/claude-plugins-official38k8 repos~2.8kAutomated safety check: PassApache-2.0
Claude Code Skill Developer Guidediet103/claude-code-infrastructure-showcase10k11 repos~3.5kAutomated safety check: PassMIT
Plugin Settings Patternanthropics/claude-plugins-official38k7 repos~3kAutomated safety check: PassApache-2.0
MCP Integration for Pluginsanthropics/claude-plugins-official38k11 repos~3.1kAutomated safety check: PassApache-2.0

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Categories

Questions about Validate Plugin

What does Validate Plugin do?

Validate a Claude Code plugin directory against the official Anthropic spec and Intent Solutions enterprise standard. Validate Plugin is an agent skill from jeremylongshore/tons-of-skills-marketplace. Validate a Claude Code plugin directory against the official Anthropic spec and Intent Solutions enterprise standard.

When should I use Validate Plugin?

Validate Plugin fits situations like: building a new plugin; preparing for marketplace submission; auditing existing plugins; with validate this plugin.

How do I install Validate Plugin in Claude Code?

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

How do I install Validate Plugin in Codex?

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

Can I use Validate Plugin 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 validate-plugin -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/validate-plugin, .gemini/skills/validate-plugin, .github/skills/validate-plugin and .opencode/skills/validate-plugin in your project.

What does Validate Plugin need to run?

Going by SKILL.md and its folder, Validate Plugin needs the command-line tools its instructions call (python3). Our summary lists: Python 3. Its frontmatter pre-approves these tools: Read, Bash(python3:*), Bash(jq:*), Bash(chmod:*), Glob, Grep. Compatibility (from SKILL.md): Designed for Claude Code.

Does Validate Plugin access the network?

SKILL.md names 1 domain. As links in the text: code.claude.com. This is read from the text; nothing was executed.

Is Validate Plugin 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. Review the folder before installing.

What licence does Validate Plugin use?

Validate Plugin 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 Validate Plugin use?

About 713 tokens (SKILL.md is roughly 2.9k 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 3.4k tokens, read only when the agent opens those files.

What are the alternatives to Validate Plugin?

Skills that share tags, products or a category with Validate Plugin: Hook Development for Claude Code Plugins (anthropics/claude-plugins-official, 38k stars), Claude Code Agent Development (anthropics/claude-plugins-official, 38k stars), Claude Code Skill Developer Guide (diet103/claude-code-infrastructure-showcase, 10k stars) and Plugin Settings Pattern (anthropics/claude-plugins-official, 38k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Validate Plugin?

jeremylongshore (a GitHub user) maintains it in jeremylongshore/tons-of-skills-marketplace, which has 2,821 GitHub stars. The repository holds 3,342 skills in this directory. The repository was last updated on October 8, 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.