Borrowing it
Nothing to install: this file belongs to janmaaarc/basecamp. 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/janmaaarc/basecamp/main/CLAUDE.mdgit clone --depth 1 https://github.com/janmaaarc/basecampWrote 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/janmaaarc/basecamp/claude-md)<a href="https://agentmods.dev/instructions/janmaaarc/basecamp/claude-md"><img src="https://agentmods.dev/badge/instructions/janmaaarc/basecamp/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/janmaaarc/basecamp/claude-md"><img src="https://agentmods.dev/badge/instructions/janmaaarc/basecamp/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 | $0.02684 | $0.02684 |
| Opus 5.5 | $0.01074 | $0.01074 |
| Sonnet 5.5 | $0.00537 | $0.00537 |
| Haiku 4.5 | $0.00268 | $0.00268 |
Grade B, and why
basecamp CLAUDE.md scanned grade B 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 7d 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.
Reads agent configuration directoriesmediumAgent snooping
.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.
- Before editing `.claude/settings.json`, `.claude/settings.local.json`, `~/.codex/config.toml`, hooks, or MCP server config in any project: run `npx ecc-agentshield scan` first if not run recently. Not required for norm Copies of this mod
1 near-identical copy found in the catalogue:
- basecamp AGENTS.md — 89% identical, 174 lines differ
How it starts
The opening of the file, as written. The whole thing — 170 lines — stays where its author put it; the contents beside it link to each section on GitHub.
@RTK.md @rules/karpathy.md @rules/security.md
Rule priority: security rules override simplicity rules. When they conflict, default to the secure choice.
About You
- I build [e.g. AI agents, web apps, automation tools]
- Stack: [e.g. Next.js, Python, Supabase, Node.js]
- I value production-ready code over quick hacks.
Your Defaults
- Package manager: [npm / pnpm / yarn / pip]
- Auth: [Supabase Auth / Clerk / NextAuth]
- Styling: [Tailwind / CSS Modules]
- Deployment: [Vercel / Railway / Fly.io]
- Icons: [Lucide / Heroicons]
Frontend
- Run
/impeccable auditand/impeccable polishbefore shipping any UI. (Requires the impeccable plugin, which installs for Claude Code and Codex. Remove this line if not installed.) - No inline styles. Use your CSS framework of choice.
Coding Rules
- Keep files modular.
- Keep files under 800 lines. At 800+, flag it and propose a split by responsibility (e.g. utils, hooks, sub-components) before adding more code. Never exceed 1,000 lines.
- Never introduce breaking changes without explaining why.
- No external libraries unless nothing installed works.
- Use the project dependency file for correct versions. Never assume latest.
- Keep a
.env.examplewith every required var (names only, no values). Add, edit, or remove vars there whenever code changes require it, no need to ask each time. Never commit.env. If a project's.gitignorehas a blanket.env*rule, add!.env.exampleso the template itself isn't excluded. - Comments: one line only. Explain why, not what. Example:
// retry here because Stripe webhooks fire twice on timeout - Markdown files: kebab-case names (e.g. my-notes.md). Conventional root and meta docs keep their established uppercase names:
README.md,CHANGELOG.md,CLAUDE.md,LICENSE, and the project memory files (PROJECT.md,MISTAKES.md,CONTRACT.md,REQUIREMENTS.md). - Watch for obvious bugs proactively.
- When sweeping for a pattern, enumerate the full set present and diff against the allowed set. Don't grep only for instances already suspected.
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.
- 7d ago Changed · +1 lines · +23 tokens per session 202c4f7f694b
- 14d ago Changed · +3 lines · +201 tokens per session ab2fa53f525f
- 23d ago Changed · +1 lines · +102 tokens per session 79d562195f5a
- 1mo ago Changed · +1 lines · +91 tokens per session 992b0a0fd4e1
- 1mo ago Changed · +15 tokens per session scan A → B bf0d57b5ad6d
- 1mo ago First seen · 164 lines · 2,252 tokens per session scan A 7097e415dbf1
basecamp CLAUDE.md is an instructions file published in the GitHub repository janmaaarc/basecamp (7 stars, last pushed 3d ago), licensed MIT. It adds 2,684 tokens to every session, about $0.0107 per session on Opus 5.5. A static security scan graded it B with 1 finding (reads agent configuration directories). 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.
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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.