What is skills AGENTS.md?

A repository-specific instruction file for coding agents working in the narumiruna/skills project. It defines local rules for communication, documentation, code style, commands, and task boundaries.

Use it when editing code or documentation in that repository, especially when updating skills, README entries, commands, or maintainer guidance.

It keeps agent changes consistent with the project's own standards and prevents important repository rules from being missed.

How narumiruna/skills configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to narumiruna/skills. 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/narumiruna/skills/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/narumiruna/skills

Made for: 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/narumiruna/skills/agents-md/github.svg)](https://agentmods.dev/instructions/narumiruna/skills/agents-md)

Your own site

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

Per session 920 This file is loaded in full into every session.

When invoked 920 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	$0.00920	$0.00920
Opus 5.5	$0.00368	$0.00368
Sonnet 5.5	$0.00184	$0.00184
Haiku 4.5	$0.00092	$0.00092

Measured 1mo ago against content hash f0b0e06b27e8, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

skills 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.

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.

Repository Guidelines

Follow global defaults; this file contains only repository-specific additions and overrides.

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.
Follow the model-selection policy in ./skills/default/prompt-gpt/SKILL.md when creating, revising, or reviewing skills and other agent-facing prompts.
Keep external positioning, installation flows, and skill discovery in README.md, and keep maintainer workflow in this file.
Update the README catalog when a skill is added, deprecated, renamed, recategorized, or materially changes its trigger.
Update installation documentation and executable recipes only in the files that own the affected flow.

Code Style

Follow KISS (Keep It Simple) and YAGNI (You Aren't Gonna Need It).
Prefer simple, minimal solutions over unnecessary complexity.
Use lowercase kebab-case for skill directories and name every required entry file exactly SKILL.md.
Preserve a skill's original user intent when naming or renaming it; do not force <verb-ing>-<object> when that changes the meaning.
Retain explicit-invocation skills that provide useful mode shortcuts even when their behavior can be inferred; keep explain-step-by-step active.
Keep a skill's frontmatter description and README catalog entry aligned when its trigger or purpose changes.
Keep examples repository-relative and executable when practical.
For user interfaces, apply Apple-derived design philosophy across platforms while translating platform-specific metrics and controls to target conventions; minimize cognitive load without sacrificing functional completeness, keep critical actions and state visible, and use predictable progressive disclosure for secondary complexity.

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.

1mo ago Changed · +30 tokens per session f0b0e06b27e8
2mo ago Changed · -1 tokens per session 989dbc5c680e
2mo ago Changed · -1 lines · -41 tokens per session 1de412eab75f
2mo ago Changed · -7 lines · -22 tokens per session ba6770b6320f
2mo ago First seen · 66 lines · 954 tokens per session scan A 87a4cd1abe95

Subscribe to this mod's changes

skills AGENTS.md is an instructions file published in the GitHub repository narumiruna/skills (17 stars, last pushed yesterday), licensed MIT. It adds 920 tokens to every session, about $0.0037 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 2026-08-30.

agent-skills

skills AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
skills AGENTS.mdnarumiruna/skills	Instructions file	17	yesterday	MIT	A	920	Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	today	MIT	A	7,461	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	5,516	GitHub Copilot
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	today	MIT	A	4,680	Codex, OpenCode
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	3,093	GitHub Copilot
vscode ai-customization.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	1,907	GitHub Copilot

skills: Instructions file for Codex