api-contract-reviewer

An automated reviewer for API contracts, the agreed rules for how software services communicate. It checks for breaking changes, naming consistency, error-response structure, versioning, and pagination, using guidance from major API design standards.

In plain words
What is it for?
It helps teams review API changes, identify removed or newly required fields, changed response types or paths, inconsistent resource names, unsuitable HTTP errors, versioning issues, and pagination problems.
Why use it?
It helps catch changes that could break existing clients or make an API inconsistent before they reach a release pipeline. Findings are reported with severity, location, explanation, and a suggested fix.

Agent

Part of the dev-crew plugin — 14 skills, 41 agents, 3 hooks shipped together

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.

agentmods
npx agentmods add agents/morodomi/dev-crew/api-contract-reviewer
Clone the repo
git clone --depth 1 https://github.com/morodomi/dev-crew

Or install dev-crew, the plugin that ships this one along with the rest of its 14 skills, 41 agents, 3 hooks.

Per session 35 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 500 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00035 $0.00500
Opus 5 $0.00017 $0.00250
Sonnet 5 $0.00007 $0.00100
Haiku 4.5 $0.00003 $0.00050

Measured 2d ago against content hash e6cc902afa6b, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

api-contract-reviewer 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 2d 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/api-contract-reviewer.md · 34 lines

What it actually says

Focus

観点 チェック内容 参照元
Breaking Changes required field 後追い追加、enum 値削除、レスポンス型変更、URL パス変更 Azure Breaking Changes Guidelines
Resource Naming リソース名の一貫性、複数形/単数形、ネスト深度 Google API Design Guide
Error Structure エラーレスポンス構造の一貫性、HTTP ステータスコード適切性 Microsoft REST API Guidelines
Versioning バージョニング戦略の一貫性 Google API Design Guide
Pagination ページネーション実装の一貫性 Microsoft REST API Guidelines

Output

{"blocking_score": 0-100, "issues": [{"severity": "critical|important|optional", "category": "breaking-change|naming|error-structure|versioning|pagination", "message", "file", "line", "suggestion"}]}

ブロッキングスコア基準

blocking_score: パイプラインをブロックすべき度合い(0 = 問題なし, 100 = ブロック必須) 80-100→BLOCK | 50-79→WARN | 0-49→PASS

Memory

起動時に注入される agent memory(.claude/agent-memory/dev-crew-api-contract-reviewer/MEMORY.md)を過去知見として参照のみ行う(Write/Edit は disallowedTools で不可。更新は人間が手動で行う)。 Record 対象(人間が手動記録): プロジェクト固有の API 命名規約、バージョニング戦略、既知の破壊的変更履歴。 Skip: 一般的な REST 設計知識、フレームワーク固有の API ルーティング構文。

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. 2d ago First seen · 34 lines · 35 tokens per session scan A e6cc902afa6b

Subscribe to this mod's changes

api-contract-reviewer is an agent published in the GitHub repository morodomi/dev-crew (1 stars, last pushed 4d ago), licensed MIT. It adds 35 tokens to every session and 500 once invoked, about $0.0002 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.