Borrowing it
Nothing to install: this file belongs to sepahead/crebain. 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/sepahead/crebain/main/CLAUDE.mdgit clone --depth 1 https://github.com/sepahead/crebainWrote 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/sepahead/crebain/claude-md)<a href="https://agentmods.dev/instructions/sepahead/crebain/claude-md"><img src="https://agentmods.dev/badge/instructions/sepahead/crebain/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/sepahead/crebain/claude-md"><img src="https://agentmods.dev/badge/instructions/sepahead/crebain/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 | $0.00194 | $0.00194 |
| Opus 5.5 | $0.00078 | $0.00078 |
| Sonnet 5.5 | $0.00039 | $0.00039 |
| Haiku 4.5 | $0.00019 | $0.00019 |
Grade A, and why
crebain 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.
What it actually says
CREBAIN Claude entrypoint
@AGENTS.md
Read README.md first. AGENTS.md, imported above, owns the development method, document routing, validation matrix, and documentation language. Do not maintain a second copy of those rules here.
- The owner authorizes unsigned commits, pushes, and merges to
mainafter the applicable complete gate. - Do not add AI attribution or co-author trailers to commits or pull requests.
- CREBAIN has three distinct surfaces: the standalone native city environment, the desktop application, and the small local NCP body. Their state, coordinate frames, dependencies, and tested limits are different. Read the owning contract before proposing a change.
- Preserve active work, failed evidence, exact ownership, and scientific limits.
- Do not turn source tests into installed qualification, simulated observations into calibrated measurements, or local receipts into command authority.
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 · +3 lines · +35 tokens per session f27282465561
- 2mo ago Changed · -30 lines · -401 tokens per session 2ba2ec5b06b3
- 2mo ago First seen · 44 lines · 560 tokens per session scan A c775d1238cd7
crebain CLAUDE.md is an instructions file published in the GitHub repository sepahead/crebain (22 stars, last pushed 12d ago), licensed Apache-2.0. It adds 194 tokens to every session, about $0.0008 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.
crebain CLAUDE.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| crebain CLAUDE.mdsepahead/crebain | Instructions file | 22 | 12d ago | Apache-2.0 | A | 194 | Claude Code |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 9,719 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | today | MIT | A | 7,461 | Codex, OpenCode |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 5,516 | GitHub Copilot |
| langchain AGENTS.mdlangchain-ai/langchain | Instructions file | 149k | today | MIT | A | 4,680 | Codex, OpenCode |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 3,093 | GitHub Copilot |
| deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness | Instructions file | 275k | 3d ago | MIT | A | 4,313 | Codex, OpenCode |