Borrowing it
Nothing to install: this file belongs to shenchangmin/cairnkit. 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/shenchangmin/cairnkit/main/AGENTS.mdgit clone --depth 1 https://github.com/shenchangmin/cairnkitWrote 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/shenchangmin/cairnkit/agents-md)<a href="https://agentmods.dev/instructions/shenchangmin/cairnkit/agents-md"><img src="https://agentmods.dev/badge/instructions/shenchangmin/cairnkit/agents-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/shenchangmin/cairnkit/agents-md"><img src="https://agentmods.dev/badge/instructions/shenchangmin/cairnkit/agents-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 | $0.02251 | $0.02251 |
| Opus 5.5 | $0.00900 | $0.00900 |
| Sonnet 5.5 | $0.00450 | $0.00450 |
| Haiku 4.5 | $0.00225 | $0.00225 |
Grade A, and why
cairnkit 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 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.
How it starts
The opening of the file, as written. The whole thing — 132 lines — stays where its author put it; the contents beside it link to each section on GitHub.
cairnkit — Agent instructions (Codex / AGENTS.md harness)
cairnkit is a knowledge-precipitation delivery harness. The workflow is the pipe; knowledge
is the moat. This file is the entry point for harnesses that read AGENTS.md (OpenAI Codex
CLI and compatibles). The Claude Code form of the same harness lives in .claude-plugin/ +
commands/ + skills/; both forms drive the same cairn engine and the same role
content in agents/ — see docs/ADAPTERS.md.
The engine: cairn
The deterministic core is a single self-contained binary, cairn (Rust; no language-runtime
dependency). System Git is invoked only by optional shared-repository operations. The binary owns
the state machine, admission gates, and knowledge layer. You never hold workflow state in your
head — cairn is the only writer of state (.cairnkit/STATE.yaml). All commands run from the
host project root:
cairn --root . config show # is the project initialised? (has_run flag)
cairn --root . state init --run-id <id> # start a run
cairn --root . state new --run-id <id> # archive DONE and start the next run
cairn --root . state show | resume # current state / {stage, paused}
cairn --root . state advance # -> next stage (gate-checked)
cairn --root . state set-path-mode <full|lite|single|tooling>
cairn --root . state approve-clarify | unblock
cairn --root . state fail --stage <BUILD_VERIFY|E2E_VERIFY>
cairn --root . kb build-index | query --stage <S> --budget 300 | extract --from <dir> | touch --from <dir>
cairn --root . lifecycle promote | decay · lint [--fix] · knowledge stats
cairn --root . kbrepo sync-in | sync-out | pull | push --message <m> | promote --id <id> --to <L1|L2> | init
Exit codes: 0 ok · 2 usage · 3 gate refused · 4 STATE corrupt. Never edit
.cairnkit/STATE.yaml by hand.
How role dispatch works here
The installed cairnkit plugin is skills-only: its bundled cairnkit and
workflow-orchestrator skills drive the same cairn engine. Source role content is canonical in
agents/ and is mirrored into the isolated native package under plugins/cairnkit/resources/.
It does not require, install, copy, or select custom Codex profiles.
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 First seen · 132 lines · 2,251 tokens per session scan A 84925005ff67
cairnkit AGENTS.md is an instructions file published in the GitHub repository shenchangmin/cairnkit (1 stars, last pushed 2mo ago), licensed MIT. It adds 2,251 tokens to every session, about $0.0090 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).
deno copilot-instructions.md
Copilot instructions for denoland/deno, covering deno development guide for github copilot, network access, high level overview, key directories and key files to understand first.