Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add instructions/krokoko/cairn/agents-mdgit clone --depth 1 https://github.com/krokoko/cairnWrote 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/krokoko/cairn/agents-md)<a href="https://agentmods.dev/instructions/krokoko/cairn/agents-md"><img src="https://agentmods.dev/badge/instructions/krokoko/cairn/agents-md.svg" alt="Measured on agentmods" 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 | $0.00216 | $0.00216 |
| Opus 5 | $0.00108 | $0.00108 |
| Sonnet 5 | $0.00043 | $0.00043 |
| Haiku 4.5 | $0.00022 | $0.00022 |
Grade A, and why
cairn AGENTS.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 3d 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
Cairn
Plugin marketplace for making codebases ready for autonomous AI development.
Repository layout
plugins/— self-contained plugins (skills/<name>/with nestedreferences/, plushooks/,scripts/, manifests).claude-plugin/marketplace.json— Claude Code marketplace registry.agents/plugins/marketplace.json— Codex marketplace registryschemas/— JSON schemas for manifests and SKILL frontmattertools/— validators and markdownlint custom rulesdocs/DESIGN_GUIDELINES.md— plugin authoring rulesdocs/DEVELOPMENT_GUIDE.md— local development and CI
Before changing plugins
Run mise run build (lint + reference integrity). See CONTRIBUTING.md.
Size limits
SKILL.md: max 400 linesreferences/*.md: max 150 lines each- Split content across reference files when limits are exceeded
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.
- 3d ago First seen · 24 lines · 216 tokens per session scan A 6531e1699a9c
cairn AGENTS.md is an instructions file published in the GitHub repository krokoko/cairn (13 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 216 tokens to every session, about $0.0011 per session on Opus 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
aiwg CLAUDE.md
Claude Code instructions for jmagly/aiwg, covering provider workspace bootstrap, provider workspace bootstrap and aiwg artifact output policy.
aiwg AGENTS.md
AGENTS.md instructions for jmagly/aiwg, covering agents.md, provider workspace bootstrap and framework context.
nightshift AGENTS.md
Instructions for orwa-mahmoud/nightshift: AI-assisted contributions are welcome. The same correctness, security, licensing, testing, and quality standards apply regardless of which tools are used.
RedEye CLAUDE.md
Instructions for Bitmia-ai/RedEye, covering redeye, commands, how it works, control files and architecture.
dark-factory-experiment CLAUDE.md
Claude Code instructions for coleam00/dark-factory-experiment, covering claude.md, project overview, tech stack, repo layout and running the app.
SeekMoney-ai CLAUDE.md
Instructions for zykooooooooo/SeekMoney-ai, covering claude.md, project overview, development commands, development and production.