Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add instructions/s977043/river-review/copilot-instructionsgit clone --depth 1 https://github.com/s977043/river-reviewWrote 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/s977043/river-review/copilot-instructions)<a href="https://agentmods.dev/instructions/s977043/river-review/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/s977043/river-review/copilot-instructions.svg" alt="Measured on agentmods" 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 | $0.00509 | $0.00509 |
| Opus 5 | $0.00254 | $0.00254 |
| Sonnet 5 | $0.00102 | $0.00102 |
| Haiku 4.5 | $0.00051 | $0.00051 |
Grade A, and why
river-review copilot-instructions.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 5d 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
Copilot instructions (river-review)
Single source: 必ずリポジトリルートの AGENTS.md を先に読み、そこで定義された手順・完了条件に従ってください。本ファイルは Copilot 向けの最小差分です。
必須チェック（着手前に確認）
- 目的と受入条件を読み、短い計画をコメントで共有してから作業開始。
- タスク単位でブランチを作成し、PR を用意する。
- PR 前に
npm testとnpm run lintを実行。レビュー依頼を PR 本文に記載。 - レビューコメントは日本語で記載する。
参照ポイント
- 指示ファイル:
.github/instructions/*.instructions.md - カスタムエージェント:
@river-review(.github/agents/内) - プロンプト:
/skill,/review,/pr(.github/prompts/内) - Docs: 日本語を正とし、
.en.mdは翻訳版とします。
責務分離ルール（肥大化防止）
copilot-instructions.md: 全体で不変に近いルールのみを記載。.github/instructions/*.instructions.md: パス/言語ごとの実装規約を記載。.github/prompts/*.prompt.md: 手動実行する定型タスクを記載。- 変更頻度が高い手順は
docs/runbook/に集約し、ここへ長文で書かない。
レイヤー別の使い分け
| Layer | 用途 | 例 |
|---|---|---|
prompt (.github/prompts/) |
手動実行の単機能タスク | /select_review, /pr |
agent (.github/agents/) |
役割ベースの委譲、ツール制限付き | river-review, security |
skill (skills/) |
再利用可能なレビューロジック、フェーズ対応 | upstream/, midstream/, downstream/ |
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.
- 5d ago First seen · 33 lines · 509 tokens per session scan A 5db236b5b414
river-review copilot-instructions.md is an instructions file published in the GitHub repository s977043/river-review (3 stars, last pushed today), licensed MIT. It adds 509 tokens to every session, about $0.0025 per session on Opus 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
logic-lens AGENTS.md
Instructions for hyhmrright/logic-lens, covering logic-lens — developer guide (codex cli), invoking skills, project layout, key conventions and no hooks.
adversarial-review AGENTS.md
Instructions for robertoecf/adversarial-review, covering agents.md: review agent guidelines (host-agnostic), plugin architecture, cross-host routing, anti-recursion contract and critique discipline (v0.8.1+).
adversarial-review CLAUDE.md
Instructions for robertoecf/adversarial-review, covering claude.md - claude code directives, plugin: adversarial-review v0.9.4, architecture, critical gotchas and tool preferences.
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).
spec-kit AGENTS.md
AGENTS.md instructions for github/spec-kit, covering agents.md, about spec kit and specify, quickstart — add a new integration in 5 steps, integration architecture and integrationmanifest — file tracking.
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.