Requirements Clarity & Acceptance Criteria

Requirements Clarity & Acceptance Criteria is a skill for Claude Code from s977043/river-review. It costs 26 tokens per session (1,837 once invoked), scanned A, original, MIT.

A review skill for checking requirements and specification documents. It looks for clear scope, defined terms, testable acceptance criteria, edge cases, and operational requirements.

In plain words
What is it for?
It is for reviewing product requirements, specifications, and user stories, including permissions, invalid input, missing data, timeouts, performance, privacy, dependencies, and unresolved decisions.
Why use it?
It reduces misunderstandings between requirements and implementation, making the work easier to build and test.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the river-review plugin — 138 skills, 18 commands, 5 agents, 3 hooks shipped together

Good fit It is for reviewing product requirements, specifications, and user stories, including permissions, invalid input, missing data, timeouts, performance, privacy, dependencies, and unresolved decisions.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/s977043/river-review/requirements-acceptance
Install

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.

Any agent
npx skills add s977043/river-review --skill requirements-acceptance
Clone the repo
git clone --depth 1 https://github.com/s977043/river-review

Made for: Claude Code.

Or install river-review, the plugin that ships this one along with the rest of its 138 skills, 18 commands, 5 agents, 3 hooks.

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.

agentmods badge for Requirements Clarity & Acceptance Criteria

README.md
[![agentmods](https://agentmods.dev/badge/skills/s977043/river-review/requirements-acceptance/github.svg)](https://agentmods.dev/skills/s977043/river-review/requirements-acceptance)
Your own site
<a href="https://agentmods.dev/skills/s977043/river-review/requirements-acceptance"><img src="https://agentmods.dev/badge/skills/s977043/river-review/requirements-acceptance/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.

agentmods 80×15 button for Requirements Clarity & Acceptance Criteria

Your own site · 80×15
<a href="https://agentmods.dev/skills/s977043/river-review/requirements-acceptance"><img src="https://agentmods.dev/badge/skills/s977043/river-review/requirements-acceptance.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 26 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,837 The whole file, excluding the scripts and references it only reads on demand.
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00026 $0.01837
Opus 5 $0.00013 $0.00919
Sonnet 5 $0.00005 $0.00367
Haiku 4.5 $0.00003 $0.00184

Measured 7d ago against content hash cde99092b8f7, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

Requirements Clarity & Acceptance Criteria 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 7d 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.

skills/upstream/requirements-acceptance/SKILL.md · 114 lines

How it starts

The opening of the file, as written. The whole thing — 114 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Pattern declaration

Primary pattern: Reviewer Secondary patterns: Inversion Why: 要件/仕様ドキュメントの差分から曖昧さ・受け入れ条件の抜けをレビューし、実装ブレや炎上シナリオを逆照射する。

Goal / 目的

  • 要件/仕様ドキュメントの差分から、実装ブレや炎上の原因になりやすい「曖昧さ・抜け」を早期に潰す。

Non-goals / 扱わないこと

  • UI/実装の最適解を断定しない(要件としての決定事項・受け入れ条件に絞る)。
  • 仕様が未確定な点を欠陥と断定しない(未決なら “未決の明示” を促す)。

Pre-execution Gate / 実行前ゲート

このスキルは以下の条件がすべて満たされない限りNO_REVIEWを返す。

  • 差分に要件定義・仕様書・PRD・ユーザーストーリーに関するドキュメントが含まれている
  • inputContextにdiffが含まれている

ゲート不成立時の出力: NO_REVIEW: requirements-acceptance — 要件/仕様ドキュメントの差分がない

False-positive guards / 抑制条件

  • 差分外の既存仕様まで掘り返して問題視しない(今回の変更と直結する範囲に限定)。

Rule / ルール

  • まず「この文書で何を決めたか/何が未決か」を 1 行で要約する。
  • 指摘は最大 8 件まで。優先度の高いもの(実装ブレ・運用事故・テスト不能)を先に出す。
  • 可能な限り “質問” ではなく “追記してほしい項目 + 例文(貼れる形)” を出す。

Checklist / 観点チェックリスト

  • 用語とスコープ
    • 用語の定義(ユーザー/権限/対象データ/対象外)が明示されているか。
    • イン/アウトの境界(何をやらないか、既存仕様との違い)が明確か。
  • 受け入れ条件
    • Given-When-Then などでテスト可能な受け入れ条件があるか。
    • 正常系だけでなく、代表的な例外系(権限なし/入力不備/データなし/タイムアウト/競合)があるか。
  • 非機能
    • 期待性能(レイテンシ/スループット/上限)・可用性/SLO・コスト前提があるか。
    • 監査/ログ/データ保持/プライバシー(PII)などの要求があるか。
  • 依存とリスク
    • 外部依存/前提条件(別チーム/既存API/データ整備)が明記されているか。
    • リスクと未決事項(決める期限/意思決定者/判断材料)が書かれているか。

Output / 出力フォーマット

すべて日本語。<file>:<line>: <message> 形式で出力する。

  • 先頭に要約を 1 行: (summary):1: <この文書が決めたこと/未決の要点>
  • 以降は指摘(最大 8 件):
    • <message>[severity=critical|major|minor|info] を含める(原則: major 以上を優先)。
    • “追記案” を 1 行で付ける(貼れる短文)。

例:

  • (summary):1: 目的と対象ユーザーは明確だが、受け入れ条件と例外系が未定義。
  • docs/prd.md:42: [severity=major] 受け入れ条件がテスト可能な形で不足。追記案: Given <前提>, When <操作>, Then <期待結果> を 3〜5 本追加。

トレーサビリティ ref の付記(#1666 / #1545 Phase 2)

対象ドキュメントに受け入れ条件 ID・テストケース ID・見出しアンカーが実在し、判明している場合のみ、指摘の末尾に次のラベルを付ける。

  • CriterionRefs: — その指摘が紐づく受け入れ条件 / テストケースの ID(例: AC-4, TC-7)。
  • ArtifactRefs: — その指摘が紐づく artifact のアンカー(例: docs/prd.md#AC-4)。

制約は次のとおり。

  • <file>:<line>: と同じ行の末尾に置く。取り込みは行単位で行われ、2 行目以降に書いたラベルは finding へ届かない。
  • ID を捏造しない。ドキュメントに実在する見出し・ID をそのまま転記する。採番や正規化は行わない(名前空間は River Review が所有しない)。
  • 受け入れ条件がまだ存在しない指摘には付けない。「受け入れ条件が無い」こと自体を指摘する場合は参照先が無いので省略する。
  • 値は空白を含まないトークンにし、区切りは , または を使う。空白区切りの 2 個目以降は取り込まれない。
  • アンカー付きで書くdocs/prd.md#AC-4)。# の無い裸のファイルパスは Evidence のファイル参照と区別できず、差分照合の対象に残る(fail-safe)。
  • ラベル名は大文字小文字を区別する。criterionRefs: のような lowerCamel 表記はラベルとして扱われない。
  • 散文の中でラベル名に言及するときは `CriterionRefs:` のようにバッククォートで囲む。囲まないと構造ラベルとして解釈される。
  • 付記は additive なメタデータであり、severity やゲート判定には影響しない。

Read the full file on GitHub · 114 lines

Files

What ships with it

2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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.

  1. 7d ago First seen · 114 lines · 26 tokens per session scan A cde99092b8f7

Subscribe to this mod's changes

Requirements Clarity & Acceptance Criteria is a skill published in the GitHub repository s977043/river-review (3 stars, last pushed today), licensed MIT. It adds 26 tokens to every session and 1,837 once invoked, about $0.0001 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 2026-09-03.

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