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/thaitype/chief/agents-mdgit clone --depth 1 https://github.com/thaitype/chiefWhat 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 | $0.01176 | $0.01176 |
| Opus 5 | $0.00588 | $0.00588 |
| Sonnet 5 | $0.00235 | $0.00235 |
| Haiku 4.5 | $0.00118 | $0.00118 |
Grade A, and why
chief 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 2d 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 — 118 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AGENTS.md
Agent Behavior Principles
1. Think Before Acting
- Start with the smallest plausible interpretation of the request.
- If uncertain, ask ONE clarifying question — don't assume the big interpretation.
- Surface tradeoffs and push back when a simpler approach exists.
- When confused, name what's unclear and stop. Don't hide confusion behind a plan.
2. Simplicity First
- Do the minimum that solves the problem. Nothing speculative.
- If a task can be done in 1-3 commands, do it directly. Don't delegate trivial work to builder-agent.
- No features, abstractions, or error handling beyond what was asked.
- If a plan starts needing an options table, pause — you may not have understood the question.
3. Surgical Changes
- Touch only what the request requires. Don't "improve" adjacent code, comments, or formatting.
- Don't refactor things that aren't broken. Match existing style.
- Every changed line should trace directly to the user's request.
- Clean up only what YOUR changes made unused. Don't remove pre-existing dead code unless asked.
4. Goal-Driven Execution
- Transform vague requests into verifiable goals before starting.
- Define what "done" looks like. Loop until verified.
- For multi-step work, state a brief plan with verification at each step.
- Strong success criteria let agents work independently. Weak criteria require constant clarification.
User Interaction Rules
- When asking the user a question, use ask_user with ONE short question only.
- When presenting a recap, summary, or review:
- Print it as formatted text first (numbered list, table, or markdown block).
- Then ask_user ONCE with a short confirmation, e.g. "Proceed?" or "Any changes?"
- NEVER put recap content inside ask_user.
- Do NOT ask multiple questions in a row. Make a recommendation, summarize, then confirm once.
Chief Agent Framework
Rules Hierarchy
- Project Rules above (highest authority)
.chief/_rules.chief/milestone-X/_goal(lowest 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.
- 2d ago First seen · 118 lines · 1,176 tokens per session scan A 223548cd56af
chief AGENTS.md is an instructions file published in the GitHub repository thaitype/chief (56 stars, last pushed 1mo ago), licensed MIT. It adds 1,176 tokens to every session, about $0.0059 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
spec-kit AGENTS.md
AGENTS.md instructions for github/spec-kit, covering agents.md, about spec kit and specify, quickstart — add a new integration in 5 steps, integration architecture and integrationmanifest — file tracking.
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).
codex AGENTS.md
AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.
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 oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, applying the notice (cutover) and fallback chain (never fail the build).
next.js AGENTS.md
Instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.