Borrowing it
Nothing to install: this file belongs to NicolasYusim/better-codebase. 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/NicolasYusim/better-codebase/main/AGENTS.mdgit clone --depth 1 https://github.com/NicolasYusim/better-codebaseWrote 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/nicolasyusim/better-codebase/agents-md)<a href="https://agentmods.dev/instructions/nicolasyusim/better-codebase/agents-md"><img src="https://agentmods.dev/badge/instructions/nicolasyusim/better-codebase/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/nicolasyusim/better-codebase/agents-md"><img src="https://agentmods.dev/badge/instructions/nicolasyusim/better-codebase/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 | $0.00289 | $0.00289 |
| Opus 5.5 | $0.00116 | $0.00116 |
| Sonnet 5.5 | $0.00058 | $0.00058 |
| Haiku 4.5 | $0.00029 | $0.00029 |
Grade A, and why
better-codebase 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.
What it actually says
Better Codebase repository instructions
Treat this repository as an installable collection of agent skills.
Required principles
- Preserve the evidence-first, behavior-preserving, anti-overengineering purpose.
- Keep
better-codebaseorchestration-only; place each domain rule in one owner skill. - Use exact evidence, explicit uncertainty, smallest-safe-change guidance, and rejected alternatives.
- Never add dogmatic architecture, style, coverage, version, or performance rules.
Skill structure
- Keep skill folders under
skills/<skill-name>/. - Keep YAML frontmatter to
nameanddescriptiononly. - Keep each
SKILL.mdbelow 500 lines and use imperative instructions. - Update
agents/openai.yamlwhen the skill name, purpose, or default prompt changes. - Link any supporting reference directly from the owning
SKILL.md.
Cross-platform metadata
- Keep
.claude-plugin/plugin.json,.claude-plugin/marketplace.json,.codex-plugin/plugin.json, and.agents/plugins/marketplace.jsonaligned. - Keep version numbers synchronized across plugin manifests and
CHANGELOG.md. - Preserve the standard
skills/<name>/SKILL.mdlayout.
Verification
Run before completion:
python3 scripts/check_repo.py
python3 -m unittest discover -s tests -v
Do not edit generated or unrelated user files to make validation pass.
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 · 37 lines · 289 tokens per session scan A 273ebb553812
better-codebase AGENTS.md is an instructions file published in the GitHub repository NicolasYusim/better-codebase (1 stars, last pushed 2mo ago), licensed MIT. It adds 289 tokens to every session, about $0.0012 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
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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.
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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).
deepseek-harness AGENTS.md
AGENTS.md instructions for deepseek-ai/deepseek-harness, covering agents.md, pre-stable apis and released session data, repository layout, commands and host sandbox failures.