Borrowing it
Nothing to install: this file belongs to narumiruna/aru. 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/narumiruna/aru/main/AGENTS.mdgit clone --depth 1 https://github.com/narumiruna/aruWrote 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/narumiruna/aru/agents-md)<a href="https://agentmods.dev/instructions/narumiruna/aru/agents-md"><img src="https://agentmods.dev/badge/instructions/narumiruna/aru/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/narumiruna/aru/agents-md"><img src="https://agentmods.dev/badge/instructions/narumiruna/aru/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 | $0.01096 | $0.01096 |
| Opus 5.5 | $0.00438 | $0.00438 |
| Sonnet 5.5 | $0.00219 | $0.00219 |
| Haiku 4.5 | $0.00110 | $0.00110 |
Grade A, and why
aru 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 — 95 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Repository Guidance
Scope and Authority
This file applies to the entire repository.
Add a nested AGENTS.md only when a subtree has materially different rules.
For explanation, review, diagnosis, or planning requests, inspect and report without changing files.
For requested implementation or documentation work, make bounded local changes and run proportionate non-destructive checks.
Do not push, open or merge pull requests, create tags, dispatch workflows, publish releases, use aru's destructive --force takeover, or materially expand scope unless explicitly requested.
Communication & Documentation
- Lead with the most important relevant information and omit anything unnecessary or repeated.
- Use clear structure, familiar words, and concise sentences.
- Explain the main idea simply before adding necessary detail.
- Keep information accurate.
- Make documented rules specific and verifiable.
- Draw diagrams using Mermaid syntax.
Code Style
- Follow KISS (Keep It Simple) and YAGNI (You Aren't Gonna Need It).
- Prefer simple, minimal solutions over unnecessary complexity.
- Split source files over 1,000 lines along clear responsibility boundaries, or document why they must remain intact.
- Prefer aru CLI structure and terminology to follow uv and Cargo where domain semantics align; retain aru's fail-closed behavior over superficial parity.
Project Map
src/cli.rsdefines the Clap command contract.src/app.rsandsrc/app/orchestrate commands.src/manifest.rsandsrc/lockfile.rsown persisted formats.src/resolver.rs,src/registry.rs, andsrc/source/resolve package inputs.src/target/owns target-specific projections.- Keep target capability differences in
src/target/instead of scattering target checks through orchestration code. src/instruction/,src/skill.rs, andsrc/sync.rsimplement discovery and reconciliation.src/ownership.rsandsrc/transaction.rsprotect user content and atomic multi-file updates.tests/*.rsexercise the public CLI.tests/fixtures/contracts/contains byte-stable format fixtures.- Registry and instruction fixtures live under their corresponding fixture directories.
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 · +55 tokens per session b2b9813708dc
- 1mo ago Changed · -1 lines · -14 tokens per session b22d02908ff4
- 1mo ago First seen · 94 lines · 1,055 tokens per session scan A 0642111df1ee
aru AGENTS.md is an instructions file published in the GitHub repository narumiruna/aru (5 stars, last pushed 1mo ago), licensed MIT. It adds 1,096 tokens to every session, about $0.0044 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
awesome-ai-setup riverpod.instructions.md
Instructions for shuchitajain/awesome-ai-setup, covering riverpod conventions, provider types, naming, state classes and async state pattern.
awesome-ai-setup testing.instructions.md
Instructions for shuchitajain/awesome-ai-setup, covering testing conventions, test structure, test naming, mocking strategy and widget tests.
awesome-ai-setup copilot-instructions.md
Instructions for shuchitajain/awesome-ai-setup, covering project instructions, tech stack, architecture, rules and widgets.
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).