marketplace-update

marketplace-update is a skill for Claude Code from geoffjay/claude-plugins. It costs 37 tokens per session (2,123 once invoked), scanned A, original, MIT.

A skill for maintaining the marketplace.json file, which records the plugins available in a plugin marketplace.

In plain words
What is it for?
Use it to add or update plugin entries, remove obsolete entries, change plugin details, and validate the marketplace file.
Why use it?
It keeps the catalogue accurate when plugins are added, changed, or removed, and helps catch invalid marketplace data.

Skill for Claude Code

Written for Claude Code: Claude Code plugin machinery. Also seen: mentions Claude Code.

Part of the claude-plugin plugin — 2 skills shipped together

Good fit Use it to add or update plugin entries, remove obsolete entries, change plugin details, and validate the marketplace file.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/geoffjay/claude-plugins/marketplace-update
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add geoffjay/claude-plugins --skill marketplace-update
Clone the repo
git clone --depth 1 https://github.com/geoffjay/claude-plugins

Made for: Claude Code.

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

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.

agentmods badge for marketplace-update

README.md
[![agentmods](https://agentmods.dev/badge/skills/geoffjay/claude-plugins/marketplace-update.svg)](https://agentmods.dev/skills/geoffjay/claude-plugins/marketplace-update)
Your own site
<a href="https://agentmods.dev/skills/geoffjay/claude-plugins/marketplace-update"><img src="https://agentmods.dev/badge/skills/geoffjay/claude-plugins/marketplace-update.svg" alt="Measured on agentmods" height="20"></a>
Per session 37 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,123 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00037 $0.02123
Opus 5 $0.00018 $0.01061
Sonnet 5 $0.00007 $0.00425
Haiku 4.5 $0.00004 $0.00212

Measured 8d ago against content hash e94ed1cbf79c, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

marketplace-update 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 8d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (marketplace_update.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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/claude-plugin/skills/marketplace-update/SKILL.md · 358 lines

How it starts

The opening of the file, as written. The whole thing — 358 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Marketplace Update Skill

This skill provides functionality to update the .claude-plugin/marketplace.json file when plugins are added, modified, or removed from the marketplace.

Purpose

Maintain the marketplace catalog by:

  • Adding new plugin entries
  • Updating existing plugin metadata
  • Removing obsolete plugins
  • Validating marketplace structure
  • Ensuring consistency across the catalog

When to Use

Use this skill when:

  • A new plugin is created and needs to be registered
  • An existing plugin's components change (agents, commands, skills added/removed)
  • Plugin metadata needs updating (version, description, keywords, etc.)
  • A plugin is being removed from the marketplace
  • Validating marketplace.json structure

Marketplace Structure

The marketplace.json file follows this schema:

{
  "name": "marketplace-name",
  "owner": {
    "name": "Owner Name",
    "email": "[email protected]",
    "url": "https://github.com/username"
  },
  "metadata": {
    "description": "Marketplace description",
    "version": "1.0.0"
  },
  "plugins": [
    {
      "name": "plugin-name",
      "source": "./plugins/plugin-name",
      "description": "Plugin description",
      "version": "1.0.0",
      "author": {
        "name": "Author Name",
        "url": "https://github.com/username"
      },
      "homepage": "https://github.com/username/repo",
      "repository": "https://github.com/username/repo",
      "license": "MIT",
      "keywords": ["keyword1", "keyword2"],
      "category": "category-name",
      "strict": false,
      "commands": ["./commands/command-name.md"],
      "agents": ["./agents/agent-name.md"],
      "skills": ["./skills/skill-name"]
    }
  ]
}

Operations

Add Plugin

Add a new plugin entry to the marketplace:

# Use the provided Python script
python marketplace_update.py add \
  --name "plugin-name" \
  --description "Plugin description" \
  --version "1.0.0" \
  --category "category-name" \
  --agents "agent1.md,agent2.md" \
  --commands "command1.md,command2.md" \
  --skills "skill1,skill2"

Read the full file on GitHub · 358 lines

Files

What ships with it

1 file 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.

  1. 8d ago First seen · 358 lines · 37 tokens per session scan A e94ed1cbf79c

Subscribe to this mod's changes

marketplace-update is a skill published in the GitHub repository geoffjay/claude-plugins (8 stars, last pushed 10mo ago), licensed MIT. It adds 37 tokens to every session and 2,123 once invoked, about $0.0002 per session on Opus 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 2026-08-31.

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