Borrowing it
Nothing to install: this file belongs to bholzer/claude-cairn-builder. 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/bholzer/claude-cairn-builder/main/CLAUDE.mdgit clone --depth 1 https://github.com/bholzer/claude-cairn-builderWrote 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/bholzer/claude-cairn-builder/claude-md)<a href="https://agentmods.dev/instructions/bholzer/claude-cairn-builder/claude-md"><img src="https://agentmods.dev/badge/instructions/bholzer/claude-cairn-builder/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/bholzer/claude-cairn-builder/claude-md"><img src="https://agentmods.dev/badge/instructions/bholzer/claude-cairn-builder/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 | $0.02337 | $0.02337 |
| Opus 5.5 | $0.00935 | $0.00935 |
| Sonnet 5.5 | $0.00467 | $0.00467 |
| Haiku 4.5 | $0.00234 | $0.00234 |
Grade A, and why
claude-cairn-builder CLAUDE.md scanned grade A 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 2mo 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
`agents/coder.md` documents `puppeteer_*` MCP tools as the verification path, but notes that this plugin does not yet configure the Puppeteer MCP server. The agent's fallback ladder is: Playwright CLI → curl + node DOM i The source is not reproduced here
No licence file
A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.
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.
- 2mo ago First seen · 82 lines · 2,337 tokens per session scan A c1e15c3da7a1
claude-cairn-builder CLAUDE.md is an instructions file published in the GitHub repository bholzer/claude-cairn-builder (2 stars, last pushed 5mo ago), with no licence file. It adds 2,337 tokens to every session, about $0.0093 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
claude-cairn-builder CLAUDE.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| claude-cairn-builder CLAUDE.mdbholzer/claude-cairn-builder | Instructions file | 2 | 5mo ago | none | A | 2,337 | Claude Code |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 9,719 | GitHub Copilot |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 5,516 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | yesterday | MIT | A | 7,461 | Codex, OpenCode |
| 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 |
| vscode model-prompts.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 2,022 | GitHub Copilot |