Caliber is a tool that generates and continuously updates AI context and configuration files for software repositories, including CLAUDE.md, AGENTS.md, and platform-specific rules. Development teams use it to keep coding agents aligned with the current codebase across tools such as Claude Code, Cursor, Codex, OpenCode, and GitHub Copilot. Its catalogue entries include skills, hooks, rules, instructions, and settings for configuring that workflow.
Borrowing it
Nothing to install: this file belongs to caliber-ai-org/ai-setup. 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/caliber-ai-org/ai-setup/master/AGENTS.mdgit clone --depth 1 https://github.com/caliber-ai-org/ai-setupWrote 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/caliber-ai-org/ai-setup/agents-md)<a href="https://agentmods.dev/instructions/caliber-ai-org/ai-setup/agents-md"><img src="https://agentmods.dev/badge/instructions/caliber-ai-org/ai-setup/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/caliber-ai-org/ai-setup/agents-md"><img src="https://agentmods.dev/badge/instructions/caliber-ai-org/ai-setup/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 | $0.01125 | $0.01125 |
| Opus 5.5 | $0.00450 | $0.00450 |
| Sonnet 5.5 | $0.00225 | $0.00225 |
| Haiku 4.5 | $0.00112 | $0.00112 |
Grade A, and why
ai-setup 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 — 73 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Caliber
@rely-ai/caliber — AI context infrastructure CLI. Scores, generates, and syncs agent configs.
Commands
npm run build # tsup → dist/
npm run dev # watch mode
npm run test # vitest run
npm run lint # eslint src/
npx tsc --noEmit # type check
Architecture
Entry: src/bin.ts → src/cli.ts · Build: tsup.config.ts · Test: vitest.config.ts · Lint: eslint.config.js
Commands (src/commands/): init.ts · score.ts · refresh.ts · regenerate.ts · config.ts · hooks.ts · learn.ts · recommend.ts · sources.ts · undo.ts · status.ts · setup-files.ts
LLM (src/llm/): anthropic.ts · vertex.ts · openai-compat.ts · cursor-acp.ts · claude-cli.ts · types.ts · config.ts · model-recovery.ts
AI (src/ai/): generate.ts · refine.ts · refresh.ts · detect.ts · learn.ts · score-refine.ts · prompts.ts
Fingerprint (src/fingerprint/): index.ts · file-tree.ts · code-analysis.ts · sources.ts · cache.ts
Scoring (src/scoring/): index.ts · constants.ts · display.ts · Checks: checks/existence.ts · checks/quality.ts · checks/grounding.ts · checks/accuracy.ts · checks/freshness.ts · checks/bonus.ts
Writers (src/writers/): index.ts · claude/index.ts · cursor/index.ts · codex/index.ts · github-copilot/index.ts · staging.ts · manifest.ts · backup.ts
Lib (src/lib/): hooks.ts · state.ts · resolve-caliber.ts · builtin-skills.ts · sanitize.ts · git-diff.ts
Compaction (src/compaction/): index.ts · transcript.ts · cursor-transcript.ts · generic-transcript.ts · detect-transcript.ts · vendor Jev library
Other: src/constants.ts · src/test/setup.ts · github-action/ · packages/mcp-server/ · packages/shared/ · apps/
Conventions
- ESM with
.jsextensions · Tests in__tests__/dirs ·unknownoverany - Conventional commits (
feat:,fix:,refactor:) · Dev:next, Stable:master - Providers implement
LLMProviderfromsrc/llm/types.ts - Writers in
src/writers/claude/index.ts·src/writers/codex/index.tsreturnstring[] - Scoring checks in
src/scoring/checks/returnCheck[] - No hardcoded mappings — LLM-driven via
src/ai/detect.ts collectFingerprint()async with LLM enrichment (src/fingerprint/index.ts)- MCP server workspace:
packages/mcp-server/
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 · +2 lines · +49 tokens per session 4f83f36c8ded
- 1mo ago First seen · 71 lines · 1,076 tokens per session scan A ee8e2f2b31ee
ai-setup AGENTS.md is an instructions file published in the GitHub repository caliber-ai-org/ai-setup (1,310 stars, last pushed 1mo ago), licensed MIT. It adds 1,125 tokens to every session, about $0.0045 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.
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.