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.
npx skills add geoffjay/claude-plugins --skill marketplace-updategit clone --depth 1 https://github.com/geoffjay/claude-pluginsWrote 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.
[](https://agentmods.dev/skills/geoffjay/claude-plugins/marketplace-update)<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>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 | $0.00037 | $0.02123 |
| Opus 5 | $0.00018 | $0.01061 |
| Sonnet 5 | $0.00007 | $0.00425 |
| Haiku 4.5 | $0.00004 | $0.00212 |
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.
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.
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"
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.
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.
- 8d ago First seen · 358 lines · 37 tokens per session scan A e94ed1cbf79c
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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