spec-api

spec-api is an agent for Claude Code from dapi/claude-code-marketplace. It costs 65 tokens per session (1,986 once invoked), scanned A, original, MIT.

An API and integration review helper for checking specifications that describe connections between software systems.

In plain words
What is it for?
Use it to review APIs, webhooks, external integrations, HTTP methods, data contracts, status codes, and compatibility changes.
Why use it?
It finds missing endpoint details, request and response definitions, error handling, authentication, and versioning decisions before development.

Agent for Claude Code

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

Part of the spec-reviewer plugin — 1 skill, 1 command, 11 agents shipped together

Good fit Use it to review APIs, webhooks, external integrations, HTTP methods, data contracts, status codes, and compatibility changes.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/dapi/claude-code-marketplace/spec-api
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.

Clone the repo
git clone --depth 1 https://github.com/dapi/claude-code-marketplace

Made for: Claude Code.

Or install spec-reviewer, the plugin that ships this one along with the rest of its 1 skill, 1 command, 11 agents.

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 spec-api

README.md
[![agentmods](https://agentmods.dev/badge/agents/dapi/claude-code-marketplace/spec-api/github.svg)](https://agentmods.dev/agents/dapi/claude-code-marketplace/spec-api)
Your own site
<a href="https://agentmods.dev/agents/dapi/claude-code-marketplace/spec-api"><img src="https://agentmods.dev/badge/agents/dapi/claude-code-marketplace/spec-api/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 spec-api

Your own site · 80×15
<a href="https://agentmods.dev/agents/dapi/claude-code-marketplace/spec-api"><img src="https://agentmods.dev/badge/agents/dapi/claude-code-marketplace/spec-api.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 65 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,986 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 $0.00065 $0.01986
Opus 5.5 $0.00026 $0.00794
Sonnet 5.5 $0.00013 $0.00397
Haiku 4.5 $0.00006 $0.00199

Measured 1mo ago against content hash 44be3e49b049, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

spec-api 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.

spec-reviewer/agents/spec-api.md · 220 lines

How it starts

The opening of the file, as written. The whole thing — 220 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Spec API Agent

Субагент для анализа API и интеграций в спецификациях и ТЗ. Выполняет роль API Architect / Integration Specialist.

Входные данные

Получает текст спецификации от оркестратора через prompt.

Задача

Проанализировать всё, что связано с API и интеграциями, и вернуть структурированный список проблем.


Чеклист анализа

️ Гапы (пропущенная информация)

API Endpoints
  • Список endpoints — все endpoints перечислены?
  • HTTP методы — GET/POST/PUT/PATCH/DELETE указаны?
  • URL paths — пути определены и консистентны?
  • Request body — структура входных данных?
  • Response body — структура ответов?
  • Status codes — какие коды возвращаются?
  • Query params — параметры фильтрации, пагинации?
  • Path params — динамические части URL?
  • Headers — требуемые заголовки (Auth, Content-Type)?
Контракты
  • OpenAPI/Swagger — есть ли спецификация?
  • Версионирование — как версионируется API (v1, v2)?
  • Deprecation policy — как выводить старые версии?
  • Breaking changes — как уведомлять клиентов?
Error Handling
  • Error format — стандартный формат ошибок?
  • Error codes — коды для разных типов ошибок?
  • Validation errors — формат ошибок валидации?
  • Rate limiting — как сообщать о превышении лимита?
  • Retry strategy — рекомендации по повторным запросам?

Внешние интеграции

  • Список систем — все внешние системы перечислены?
  • Протоколы — REST, GraphQL, gRPC, SOAP?
  • Аутентификация — как авторизоваться в внешних API?
  • Rate limits — лимиты внешних систем?
  • SLA — гарантии доступности внешних систем?
  • Fallback — что делать при недоступности?
  • Timeout — таймауты для внешних вызовов?
  • Circuit breaker — защита от каскадных сбоев?

Webhooks / Events

  • Список событий — какие события генерируются?
  • Payload format — формат данных в webhook?
  • Delivery guarantees — at-least-once, exactly-once?
  • Retry policy — повторная доставка при ошибке?
  • Signature — как верифицировать подлинность?
  • Subscription management — как подписываться/отписываться?

Read the full file on GitHub · 220 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.

  1. 1mo ago First seen · 220 lines · 65 tokens per session scan A 44be3e49b049

Subscribe to this mod's changes

spec-api is an agent published in the GitHub repository dapi/claude-code-marketplace (16 stars, last pushed 1mo ago), licensed MIT. It adds 65 tokens to every session and 1,986 once invoked, about $0.0003 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.

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