Borrowing it
Nothing to install: this file belongs to arnarg/crushout. 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/arnarg/crushout/main/AGENTS.mdgit clone --depth 1 https://github.com/arnarg/crushoutWrote 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/arnarg/crushout/agents-md)<a href="https://agentmods.dev/instructions/arnarg/crushout/agents-md"><img src="https://agentmods.dev/badge/instructions/arnarg/crushout/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/arnarg/crushout/agents-md"><img src="https://agentmods.dev/badge/instructions/arnarg/crushout/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 | $0.01426 | $0.01426 |
| Opus 5.5 | $0.00570 | $0.00570 |
| Sonnet 5.5 | $0.00285 | $0.00285 |
| Haiku 4.5 | $0.00143 | $0.00143 |
Grade A, and why
crushout 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 2mo 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 — 61 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AGENTS.md
What This Project Is
crushout is a Crush / Claude Code hook binary that auto-allows read-only bash commands. It reads a JSON payload from stdin (hook protocol), detects whether it's Crush or Claude Code format, parses the bash command with tree-sitter, checks every command against a rule set, and outputs a JSON allow/deny/prompt decision on stdout.
Commands
go test ./... # run all tests
go build ./cmd/crushout # build the binary
No Makefile, no CI config, no linter config, no other tooling.
Architecture & Data Flow
stdin (hook JSON, Crush or Claude Code format)
→ main.go: hook.Decode() detects protocol, skip non-bash/empty commands
→ config.Load(): load global + repo config, merge with defaults
→ bash.Parse(): tree-sitter parses bash into []Command
→ checker.Check(): iterate commands, track cd, apply rules
→ stdout: JSON Output (protocol-specific allow/deny/prompt)
Packages
| Package | Purpose |
|---|---|
cmd/crushout |
Entrypoint. Reads stdin JSON, loads config, wires checker, writes stdout JSON. |
internal/hook |
Hook interface, CrushInput/ClaudeInput structs, Decode() auto-detects protocol from field names. |
internal/bash |
Tree-sitter–based bash parser. Extracts Command structs from a bash AST. Detects "complex" constructs (command substitution $(), subshells (), process substitution <(), arithmetic $(())) and parse errors, both will not auto-allow. |
internal/checker |
Orchestrates parse + rule check. Tracks cd to ensure the working directory stays within RootDir. Resolves ~/... paths against HomeDir. Any cd that would escape the root causes a deny. |
internal/config |
Layered config loading. Reads global ($XDG_CONFIG_HOME/crushout/crushout.{yml,yaml}) and repo (<rootDir>/.crushout.{yml,yaml}) config, deep-merges both over built-in defaults. Repo config wins over global. Supports overwrite_defaults: true per-layer to replace the accumulated base entirely. |
internal/rules |
Recursive rule engine (Rule struct with Subcommands, PromptFlags, AllowFlags, Default). defaults.go contains the full built-in ruleset mapping command names to their allow/deny rules. |
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.
- 2mo ago First seen · 61 lines · 1,426 tokens per session scan A fb178a14bc9b
crushout AGENTS.md is an instructions file published in the GitHub repository arnarg/crushout (2 stars, last pushed 3mo ago), licensed MIT. It adds 1,426 tokens to every session, about $0.0057 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.