api-contract-sync

api-contract-sync is an agent for coding agents from RaNDoM6913/claude-code-superkit. It costs 23 tokens per session (1,677 once invoked), scanned A, original, MIT.

An API contract checker that compares an OpenAPI or Swagger specification with the routes, request and response types, and error codes implemented by the server. OpenAPI and Swagger are formats for describing an API’s available endpoints and data.

In plain words
What is it for?
Use it to check API documentation against registered routes, handlers, data-transfer objects, and documented errors.
Why use it?
It finds differences between what an API promises and what the code actually does. If no specification exists, it reports that instead of inventing one.

Agent

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/random6913/claude-code-superkit/api-contract-sync
Clone the repo
git clone --depth 1 https://github.com/RaNDoM6913/claude-code-superkit

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 api-contract-sync

README.md
[![agentmods](https://agentmods.dev/badge/agents/random6913/claude-code-superkit/api-contract-sync.svg)](https://agentmods.dev/agents/random6913/claude-code-superkit/api-contract-sync)
Your own site
<a href="https://agentmods.dev/agents/random6913/claude-code-superkit/api-contract-sync"><img src="https://agentmods.dev/badge/agents/random6913/claude-code-superkit/api-contract-sync.svg" alt="Measured on agentmods" height="20"></a>
Per session 23 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,677 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 $0.00023 $0.01677
Opus 5 $0.00012 $0.00839
Sonnet 5 $0.00005 $0.00335
Haiku 4.5 $0.00002 $0.00168

Measured yesterday against content hash d74bb576ea82, 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-sync 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 yesterday.

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.

packages/core/agents/api-contract-sync.md · 128 lines

How it starts

The opening of the file, as written. The whole thing — 128 lines — stays where its author put it; the contents beside it link to each section on GitHub.

API Contract Sync

Cross-check the API specification (OpenAPI/Swagger) against actual route registrations, handler request/response types, and error codes. Report drift in both directions.

Hard Rules

  • Every reported row MUST cite a file:line (routes/handlers) or spec location you actually Read this session — never report from a grep hit or memory alone.
  • NEVER invent spec content. If no spec source exists → Sync Status NO_SPEC_FOUND (see Detection), list registered routes, stop.
  • Severity is this agent's own two-level enum: FAIL / WARN (defined below). Use no other levels.
  • 0 issues = IN_SYNC is a valid outcome — do not manufacture drift.
  • Report all 5 process steps, including steps that found nothing.

Phase 0 — Load Project Context

Read if present, skip silently if absent: CLAUDE.md or AGENTS.md; docs/architecture/api-reference.md. Use it to: learn the expected endpoint list, spot routes documented as intentionally internal/admin (those score WARN instead of FAIL when undocumented in the spec), and check DTO field names against the documented contract.

When to Trigger

Invoke after changes to: route registration files · API spec files (manual YAML/JSON edits) · handler/controller files (new handlers, renamed methods, changed request/response shapes) · DTO/schema files (field additions, renames, type changes).

Detection

API spec — check in order, first match wins

  1. **/openapi.yaml or **/openapi.json
  2. **/swagger.yaml or **/swagger.json
  3. **/api-spec.*
  4. Annotation-based specs (Go swagger comments, JSDoc @openapi, FastAPI auto-docs)

Default branch — none of the four found: set Sync Status NO_SPEC_FOUND, fill only the Undocumented Routes table with every registered route (Severity -), skip Steps 2–5, and finish.

Route registration — Grep by stack

  • Go (chi/mux/gin/echo/fiber): r.Get|r.Post|r.Put|r.Delete|r.Route|r.Group (or framework equivalents)
  • Node/Express: app.get|app.post|router.get|router.post
  • Python/FastAPI: @app.get|@app.post|@router.get
  • Python/Django: path\(|urlpatterns
  • Rails: read config/routes.rb

Read the full file on GitHub · 128 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. yesterday First seen · 128 lines · 23 tokens per session scan A d74bb576ea82

Subscribe to this mod's changes

api-contract-sync is an agent published in the GitHub repository RaNDoM6913/claude-code-superkit (2 stars, last pushed 1mo ago), licensed MIT. It adds 23 tokens to every session and 1,677 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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