What is razor AGENTS.md?

Repository-specific instructions for benchmark runners, datasets, measurement tests, and experiments in the Razor project. They define where benchmark and maintenance files belong.

Use them when changing Razor's tests, benchmarks, datasets, experiments, or related maintenance files.

They prevent benchmark material from being placed in the wrong directory and keep temporary maintenance output separate from the project files.

How V-Songbird/razor configures Claude Code and Codex

Reuse

Borrowing it

Nothing to install: this file belongs to V-Songbird/razor. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/V-Songbird/razor/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/V-Songbird/razor

Made for: Claude Code, Codex, OpenCode.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/v-songbird/razor/agents-md/github.svg)](https://agentmods.dev/instructions/v-songbird/razor/agents-md)

Your own site

<a href="https://agentmods.dev/instructions/v-songbird/razor/agents-md"><img src="https://agentmods.dev/badge/instructions/v-songbird/razor/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/v-songbird/razor/agents-md"><img src="https://agentmods.dev/badge/instructions/v-songbird/razor/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 1,227 This file is loaded in full into every session.

When invoked 1,227 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

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	$0.01227	$0.01227
Opus 5.5	$0.00491	$0.00491
Sonnet 5.5	$0.00245	$0.00245
Haiku 4.5	$0.00123	$0.00123

Measured yesterday against content hash e8adaa7ca509, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

razor 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 yesterday.

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.

AGENTS.md · 58 lines

How it starts

The opening of the file, as written. The whole thing — 58 lines — stays where its author put it; the contents beside it link to each section on GitHub.

razor

razor is one plugin for Claude Code, Codex and Antigravity: a checklist before new code and a few checks behind it, so a small task stays small. Its hooks and scripts are dependency-free Node.js and run with Node.js 22 or later and Git; there is no install or build step. This repository is Foundry's razor submodule and ships from main.

Start here

Before changing a check, read how razor works; each check speaks at most once and the retry always goes through.
Before adding or renaming a setting, read settings.
Before touching Codex behavior, read the Codex setup guide; patch guards only see previewable local apply_patch changes.
Before touching a README number, read the numbers.
Before a release, read the changelog and CONTRIBUTING.md.

Rules that outrank everything

One package serves the three hosts. Shared checks live outside the host adapters, and a new hook event needs an entry in hooks/hooks.json, hooks/codex-hooks.json and, when Antigravity has the event, the root hooks.json.
The three manifests, .claude-plugin/plugin.json, .codex-plugin/plugin.json and plugin.json, carry the same version, changed together; the suite fails when they differ. Foundry's catalogs carry no version for razor and only move source.sha.
razor never edits code, manifests or lockfiles and never grants a permission; every check is a message to the assistant.

Commands

Command	Purpose	Cost
`node --test tests/*.test.js`	The suite	Local fixtures inside the plugin root; fails from a checkout under the system temp directory
`node scripts/git-hooks/check-readme-nav.js`	The root README has its nav, and every heading anchor linked from a tracked Markdown file resolves	Local
`node scripts/build-windows-launchers.js --write`	After editing `hooks/windows-launcher.ps1` or a hook in `hooks/codex-hooks.json`, regenerate that file's `commandWindows` launchers; the suite fails naming the first stale one	Local
`claude plugin validate .`	Claude Code package shape	Local
`agy plugin validate .`	Antigravity package shape	Local; needs the Antigravity CLI
`git config core.hooksPath scripts/git-hooks`	One-time: the pre-commit hook runs the suite and the nav check	Local

Read the full file on GitHub · 58 lines

Changes

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.

yesterday Changed · +3 tokens per session e8adaa7ca509
1mo ago Changed · +2 tokens per session 2c767327d2a0
1mo ago Changed · +51 lines · +1,155 tokens per session eff1a10c4e94
1mo ago First seen · 7 lines · 67 tokens per session scan A 0969eb18485e

Subscribe to this mod's changes

razor AGENTS.md is an instructions file published in the GitHub repository V-Songbird/razor (8 stars, last pushed 2d ago), licensed MIT. It adds 1,227 tokens to every session, about $0.0049 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 2026-09-16.

Analytics and metrics Claude Code Testing claude-code-plugin dependency-guard hooks over-engineering yagni

razor AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
razor AGENTS.mdV-Songbird/razor	Instructions file	8	2d ago	MIT	A	1,227	Claude Code, Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	today	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

razor: Instructions file for Claude Code