What is claude-plugins?

A guide to creating and checking plugin.json files, which describe a Claude Code plugin and its components. It explains the fields and paths these configuration files can contain.

Use it when creating plugins, validating their manifests, or troubleshooting plugin configuration.

It helps prevent invalid plugin settings and makes configuration problems easier to diagnose.

claude-plugins — Skill for Claude Code by vinnie357/claude-skills

Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code

/plugin marketplace add vinnie357/claude-skills

Claude Code

/plugin install extras-claude-code

Made for: Claude Code.

Or install extras-claude-code, the plugin that ships this one along with the rest of its 12 skills, 2 commands.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/vinnie357/claude-skills/claude-plugins/github.svg)](https://agentmods.dev/skills/vinnie357/claude-skills/claude-plugins)

Your own site

<a href="https://agentmods.dev/skills/vinnie357/claude-skills/claude-plugins"><img src="https://agentmods.dev/badge/skills/vinnie357/claude-skills/claude-plugins/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/vinnie357/claude-skills/claude-plugins"><img src="https://agentmods.dev/badge/skills/vinnie357/claude-skills/claude-plugins.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 30 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 4,506 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00030	$0.04506
Opus 5.5	$0.00012	$0.01802
Sonnet 5.5	$0.00006	$0.00901
Haiku 4.5	$0.00003	$0.00451

Measured 1mo ago against content hash b5aa59fe8a7d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

claude-plugins scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

plugins/tools/claude-code/skills/claude-plugins/SKILL.md · 215 lines

How it starts

The opening of the file, as written. The whole thing — 215 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Claude Code Plugin

Guide for creating, validating, and managing plugin.json manifests for Claude Code plugins.

Per core:anti-fabrication: run the validation scripts and read the manifest before claiming a plugin.json is valid or that a component path exists. The validator names the offending field and value; that output is the authority, not this page.

Manifest schema

A manifest lives at .claude-plugin/plugin.json inside the plugin directory.

{
  "name": "plugin-name",
  "version": "1.2.0",
  "description": "Brief plugin description",
  "author": { "name": "Author Name", "email": "[email protected]", "url": "https://github.com/author" },
  "homepage": "https://docs.example.com/plugin",
  "repository": "https://github.com/author/plugin",
  "license": "MIT",
  "keywords": ["keyword1", "keyword2"],
  "commands": ["./custom/commands/special.md"],
  "agents": "./custom/agents/",
  "hooks": "./config/hooks.json",
  "mcpServers": "./mcp-config.json",
  "skills": ["./skills/skill-one", "./skills/skill-two"]
}

name is the only required field. Everything else is optional, though version, description, license, keywords, repository, and author are worth setting: they are what a user sees before installing, and author is how they reach you with a bug report or a contribution.

Field rules

Field	Rule
`name`	kebab-case, `^[a-z0-9]+(-[a-z0-9]+)*$`. Match the marketplace entry name, and be specific rather than generic. The directory name may differ (`extras-claude-code` lives in `plugins/tools/claude-code`). Valid: `my-plugin`, `core-skills`. Invalid: `myPlugin`, `my_plugin`, `My-Plugin`, `plugin-`. Never choose a reserved name — see "Reserved names" below
`version`	semver, `^[0-9]+\.[0-9]+\.[0-9]+(-[a-zA-Z0-9.-]+)?(\+[a-zA-Z0-9.-]+)?$`. Valid: `1.0.0`, `1.0.0-beta.1`, `1.0.0+build.123`. Invalid: `1.0`, `v1.0.0`, `1.0.0.0`
`license`	SPDX identifier — `MIT`, `Apache-2.0`, `GPL-3.0`, `BSD-3-Clause`, `ISC`. See https://spdx.org/licenses/
`keywords`	array of lowercase, specific, domain-bearing strings

Read the full file on GitHub · 215 lines

Files

What ships with it

6 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

1mo ago Changed · +19 lines b5aa59fe8a7d
2mo ago First seen · 196 lines · 30 tokens per session scan A 2eaac949354e

Subscribe to this mod's changes

claude-plugins is a skill published in the GitHub repository vinnie357/claude-skills (27 stars, last pushed 14d ago), licensed MIT. It adds 30 tokens to every session and 4,506 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

Building agents

claude-plugins next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
claude-pluginsvinnie357/claude-skills	Skill	27	14d ago	MIT	A	30	Claude Code
imagegenopenai/codex	Skill	134k	today	Apache-2.0	A	113	Codex
local-ai-agentsmicrosoft/ai-agents-for-beginners	Skill	79k	2d ago	MIT	A	200	Claude Code, Codex
playwright-climicrosoft/playwright	Skill	100k	today	Apache-2.0	A	19	Claude Code
browser-automationopenclaw/openclaw	Skill	394k	today	MIT	A	36	Claude Code
systematic-debuggingobra/superpowers	Skill	315k	6d ago	MIT	A	21	Claude Code
next-cache-components-adoptionvercel/next.js	Skill	143k	today	MIT	A	95	Claude Code