Borrowing it
Nothing to install: this file belongs to 2389-research/claude-plugins. 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/2389-research/claude-plugins/main/CLAUDE.mdgit clone --depth 1 https://github.com/2389-research/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/instructions/2389-research/claude-plugins/claude-md)<a href="https://agentmods.dev/instructions/2389-research/claude-plugins/claude-md"><img src="https://agentmods.dev/badge/instructions/2389-research/claude-plugins/claude-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/2389-research/claude-plugins/claude-md"><img src="https://agentmods.dev/badge/instructions/2389-research/claude-plugins/claude-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 | $0.02858 | $0.02858 |
| Opus 5.5 | $0.01143 | $0.01143 |
| Sonnet 5.5 | $0.00572 | $0.00572 |
| Haiku 4.5 | $0.00286 | $0.00286 |
Grade A, and why
claude-plugins CLAUDE.md 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.
How it starts
The opening of the file, as written. The whole thing — 252 lines — stays where its author put it; the contents beside it link to each section on GitHub.
2389 Research Claude Code Plugin Marketplace
Repository Purpose
This is a marketplace catalog for Claude Code plugins maintained by 2389 Research. It contains the plugin registry, site generator, and generated marketplace website. All plugins live in their own GitHub repos under 2389-research/.
Structure
claude-plugins/
├── .claude-plugin/
│ └── marketplace.json # Plugin registry (all entries)
├── scripts/
│ └── generate-site.js # Fetches READMEs from GitHub, builds site
├── docs/
│ ├── index.html # Generated marketplace site
│ └── style.css # Site styling
├── tests/ # Site generator tests
├── .github/
│ └── workflows/
│ ├── generate-site.yml # CI: regenerates site on push + weekly
│ └── check-plugin-installs.yml # CI: weekly check that npx installs every entry whole
├── package.json
├── CLAUDE.md # This file
└── README.md
Available Plugins
Development
| Plugin | Repo | Description |
|---|---|---|
| css-development | 2389-research/css-development | CSS development workflows with Tailwind composition, semantic naming, and dark mode by default |
| firebase-development | 2389-research/firebase-development | Firebase project workflows including setup, features, debugging, and validation |
| landing-page-design | 2389-research/landing-page-design | High-converting landing pages with Vibe Discovery and anti-AI-slop principles |
| xtool | 2389-research/xtool | Xcode-free iOS development with xtool via SwiftPM |
| building-multiagent-systems | 2389-research/building-multiagent-systems | Architecture patterns for multi-agent systems |
| speed-run | 2389-research/speed-run | Token-efficient code generation with hosted LLM (Cerebras) |
| binary-re | 2389-research/binary-re | Agentic binary reverse engineering for ELF binaries |
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 · +12 lines · +240 tokens per session 6ee3585f30a4
- 1mo ago Changed · -2 tokens per session 9b031e19baaf
- 1mo ago First seen · 240 lines · 2,620 tokens per session scan A deee1753512f
claude-plugins CLAUDE.md is an instructions file published in the GitHub repository 2389-research/claude-plugins (98 stars, last pushed 7d ago), licensed MIT. It adds 2,858 tokens to every session, about $0.0114 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 2026-08-30.
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).
vscode model-prompts.instructions.md
Model-specific prompt authoring and registry guidelines.