Borrowing it
Nothing to install: this file belongs to controlplane-com/ai-plugin. 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/controlplane-com/ai-plugin/main/CLAUDE.mdgit clone --depth 1 https://github.com/controlplane-com/ai-pluginWrote 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/controlplane-com/ai-plugin/claude-md)<a href="https://agentmods.dev/instructions/controlplane-com/ai-plugin/claude-md"><img src="https://agentmods.dev/badge/instructions/controlplane-com/ai-plugin/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/controlplane-com/ai-plugin/claude-md"><img src="https://agentmods.dev/badge/instructions/controlplane-com/ai-plugin/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 | $0.02189 | $0.02189 |
| Opus 5.5 | $0.00876 | $0.00876 |
| Sonnet 5.5 | $0.00438 | $0.00438 |
| Haiku 4.5 | $0.00219 | $0.00219 |
Grade A, and why
ai-plugin 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 17d 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 — 101 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Contributor context — Claude Code
End-user install and capability docs live in README.md. Development principles, validation, and release process live in CONTRIBUTING.md. This file is the working context for Claude Code sessions on this repo.
Repo layout
Everything lives under plugins/cpln/. All skills, rules, commands, agents, hooks, and per-client manifests are authored there, and every client (Claude Code, Codex, Cursor, Antigravity CLI) resolves that single directory as its plugin root.
| Path | Purpose |
|---|---|
plugins/cpln/ |
The plugin itself. Claude, Codex, Cursor, and Antigravity CLI all resolve this as their plugin root. |
plugins/cpln/skills/<name>/SKILL.md |
One domain skill per folder. Companion files (*.md) load on demand. |
plugins/cpln/agents/<name>.md |
One self-contained guided workflow per file. |
plugins/cpln/commands/<name>.md |
Slash command for Claude / Codex / Cursor. |
plugins/cpln/rules/*.md |
cpln-core.md (alwaysApply: true) is the short core rule set: the SessionStart hook in plugins/cpln/hooks/hooks.json injects it (Claude / Codex), Cursor loads it in every chat, and the MCP server sends it in its handshake. cpln-guardrails.md (alwaysApply: false) is the operating guide, read on demand: Cursor applies it by its description and the MCP server serves it through get_cpln_rules. Antigravity has no SessionStart hook and does not load a plugin rules/ dir (its rules live in AGENTS.md), so it gets the core through the MCP handshake. |
plugins/cpln/.claude-plugin/plugin.json |
Claude plugin manifest. |
plugins/cpln/.codex-plugin/plugin.json + mcp.json |
Codex manifest and MCP config. |
plugins/cpln/.cursor-plugin/plugin.json + mcp.json |
Cursor manifest and MCP config. |
plugins/cpln/plugin.json + mcp_config.json |
Native Antigravity CLI (agy) manifest and MCP config (remote server uses serverUrl, not httpUrl). Antigravity has no SessionStart hook event (its hooks are PreToolUse/PostToolUse/PreInvocation/PostInvocation/Stop), so the core rules reach it through the MCP handshake and the operating guide through get_cpln_rules, not a hook. agy plugin validate ./plugins/cpln gates it; install with agy plugin install https://github.com/controlplane-com/ai-plugin/plugins/cpln. |
plugins/cpln/.claude-mcp.json |
Claude MCP config. |
.claude-plugin/marketplace.json |
Claude marketplace entry. Source: "./plugins/cpln". |
.agents/plugins/marketplace.json |
Codex marketplace entry. |
.cursor-plugin/marketplace.json |
Cursor marketplace entry. |
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.
- 17d ago Changed · +194 tokens per session f2862f867d0b
- 1mo ago First seen · 101 lines · 1,995 tokens per session scan A 286881d12f62
ai-plugin CLAUDE.md is an instructions file published in the GitHub repository controlplane-com/ai-plugin (11 stars, last pushed 4d ago), licensed MIT. It adds 2,189 tokens to every session, about $0.0088 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 2026-08-31.
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).
deepseek-harness AGENTS.md
AGENTS.md instructions for deepseek-ai/deepseek-harness, covering agents.md, pre-stable apis and released session data, repository layout, commands and host sandbox failures.