Borrowing it
Nothing to install: this file belongs to tmchow/tmc-marketplace. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/tmchow/tmc-marketplace/main/.claude/skills/new-plugin/SKILL.mdgit clone --depth 1 https://github.com/tmchow/tmc-marketplaceWrote 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/tmchow/tmc-marketplace/new-plugin)<a href="https://agentmods.dev/skills/tmchow/tmc-marketplace/new-plugin"><img src="https://agentmods.dev/badge/skills/tmchow/tmc-marketplace/new-plugin/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.
<a href="https://agentmods.dev/skills/tmchow/tmc-marketplace/new-plugin"><img src="https://agentmods.dev/badge/skills/tmchow/tmc-marketplace/new-plugin.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00012 | $0.00414 |
| Opus 5 | $0.00006 | $0.00207 |
| Sonnet 5 | $0.00002 | $0.00083 |
| Haiku 4.5 | $0.00001 | $0.00041 |
Grade A, and why
new-plugin 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 9d 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.
What it actually says
New Plugin Scaffolder
Create a new plugin for the tmc-marketplace with the correct structure.
Usage
/new-plugin <plugin-name>
What This Creates
plugins/<plugin-name>/
.claude-plugin/plugin.json # Plugin manifest
skills/ # Skills directory
agents/ # Agents directory (if needed)
README.md # Plugin documentation
Workflow
- Get plugin name from args or ask user
- Validate name: lowercase, hyphenated, no spaces
- Check for conflicts: Ensure plugin doesn't already exist
- Create structure:
plugin.json template
{
"name": "<plugin-name>",
"version": "0.1.0",
"description": "<description>",
"author": {
"name": "Trevin Chow"
},
"skills": "./skills/"
}
README.md template
# <plugin-name>
<description>
## Installation
\`\`\`
/plugin marketplace add tmchow/tmc-marketplace
/plugin install <plugin-name>@tmc-marketplace
\`\`\`
## Skills
- List skills here
## Agents
- List agents here (if any)
- Register in marketplace: Add entry to
.claude-plugin/marketplace.json - Confirm: Show created structure and next steps
Next Steps After Creation
Tell the user:
- Add skills to
plugins/<plugin-name>/skills/<skill-name>/SKILL.md - Add agents to
plugins/<plugin-name>/agents/<agent-name>/AGENT.md(optional) - Update README.md with skill/agent documentation
- Run
/validate-plugin <plugin-name>before committing
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.
- 9d ago First seen · 82 lines · 12 tokens per session scan A 5f9751d0a843
new-plugin is a skill published in the GitHub repository tmchow/tmc-marketplace (22 stars, last pushed 6mo ago), licensed MIT. It adds 12 tokens to every session and 414 once invoked, about $0.0001 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 2026-08-30.
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