Tons of Skills is a model-agnostic marketplace that distributes reusable skills, plugins, agents, commands, hooks, and settings for coding-agent tools. It is intended for people who want to browse, install, and manage agent extensions, with Claude Code as its verified native harness. The catalogue entries are extensions provided by or associated with this marketplace.
Borrowing it
Nothing to install: this file belongs to jeremylongshore/tons-of-skills-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/jeremylongshore/tons-of-skills-marketplace/main/AGENTS.mdgit clone --depth 1 https://github.com/jeremylongshore/tons-of-skills-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/instructions/jeremylongshore/tons-of-skills-marketplace/agents-md)<a href="https://agentmods.dev/instructions/jeremylongshore/tons-of-skills-marketplace/agents-md"><img src="https://agentmods.dev/badge/instructions/jeremylongshore/tons-of-skills-marketplace/agents-md/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/instructions/jeremylongshore/tons-of-skills-marketplace/agents-md"><img src="https://agentmods.dev/badge/instructions/jeremylongshore/tons-of-skills-marketplace/agents-md.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 | $0.01330 | $0.01330 |
| Opus 5.5 | $0.00532 | $0.00532 |
| Sonnet 5.5 | $0.00266 | $0.00266 |
| Haiku 4.5 | $0.00133 | $0.00133 |
Grade C, and why
tons-of-skills-marketplace AGENTS.md scanned grade C with 1 finding 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 4d 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.
Hidden instructionshighPrompt injection
Directives inside HTML comments, invisible characters or bidirectional overrides are read by the model and not by the person reviewing the file.
<!-- prettier-ignore-start --> How it starts
The opening of the file, as written. The whole thing — 77 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Repository Guidelines
Project Structure
This is the Tons of Skills Claude Code plugin marketplace. Author plugins under plugins/<category>/<plugin-name>/; a plugin commonly contains skills/, commands/, .claude-plugin/plugin.json, and a README. The editable catalog is .claude-plugin/marketplace.extended.json; its marketplace.json, generated plugin package.json files, and the README table of contents are derived. Shared tooling lives in scripts/, workspace packages in packages/, Python regression tests in tests/, and the Astro site in marketplace/.
Build, Test, and Development
Use Node 22.12+ and pnpm 9.15.9+ for repository-level commands; .node-version records the tested Node floor. marketplace/ deliberately uses npm. Independently consumable packages and focused CI jobs may retain their own lower Node floors when they do not enter the full-repository or marketplace build path; see 000-docs/814-DR-STND-node-runtime-contract.md.
pnpm install
./scripts/quick-test.sh # fast repository sanity check
pnpm test && pnpm typecheck && pnpm lint
pnpm run verify # rewrite recorded plugin verification results
pnpm run sync-marketplace # regenerate catalog-derived files
cd marketplace && npm run dev # local Astro site, port 4321
cd marketplace && npx playwright test # website end-to-end tests
Do not hand-edit generated catalog artifacts. Run pnpm run sync-marketplace before committing catalog or plugin changes. Validate skill metadata with python3 scripts/validate-skills-schema.py --marketplace --verbose; use python3 scripts/validate-unicode-hygiene.py for changed skill content.
When a change alters skill scores (plugin skill content or the validator), run pnpm run verify and commit the updated .claude-plugin/marketplace.extended.json with regenerated projections (node scripts/regenerate-after-bump.mjs). CI's verify job fails when a plugin's recorded score, grade, or badge no longer matches the validator. Same-repo plugin PRs get this commit automatically from the auto-bump workflow; fork and external-sync PRs need it by hand.
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.
- 4d ago Changed · +31 lines · +378 tokens per session scan A → C 20c70559aabf
- 1mo ago Changed · +2 lines · +102 tokens per session d54dab5bc5b9
- 1mo ago Changed · +58 tokens per session 870439c4102f
- 1mo ago Changed 21b08760e63d
- 1mo ago First seen · 44 lines · 792 tokens per session scan A 02eca64d5306
tons-of-skills-marketplace AGENTS.md is an instructions file published in the GitHub repository jeremylongshore/tons-of-skills-marketplace (2,876 stars, last pushed today), licensed MIT. It adds 1,330 tokens to every session, about $0.0053 per session on Opus 5.5. A static security scan graded it C with 1 finding (hidden instructions). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
deno copilot-instructions.md
Copilot instructions for denoland/deno, covering deno development guide for github copilot, network access, high level overview, key directories and key files to understand first.