An assessment checklist for API designs, contracts, versioning, errors, authentication, limits, and documentation. An API is the agreed way that software systems exchange requests and responses.

Use it to review API routes, request and response schemas, status codes, versioning and deprecation plans, security controls, rate limits, and API documentation.

It finds inconsistent endpoints, unclear data formats, weak error handling, breaking changes, and integration risks before they cause problems for clients or other services.

api-audit — Skill for Claude Code by ivegamsft

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 ivegamsft/basecoat --skill api-audit

Clone the repo

git clone --depth 1 https://github.com/ivegamsft/basecoat

Made for: Claude Code.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/ivegamsft/basecoat/api-audit.svg)](https://agentmods.dev/skills/ivegamsft/basecoat/api-audit)

Your own site

<a href="https://agentmods.dev/skills/ivegamsft/basecoat/api-audit"><img src="https://agentmods.dev/badge/skills/ivegamsft/basecoat/api-audit.svg" alt="Measured on agentmods" height="20"></a>

Per session 70 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 483 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.

Model	Per session	Once invoked
Fable 5.1	$0.00070	$0.00483
Opus 5	$0.00035	$0.00242
Sonnet 5	$0.00014	$0.00097
Haiku 4.5	$0.00007	$0.00048

Measured 3d ago against content hash 5ef4ed204d08, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

api-audit 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 3d 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/api-audit/SKILL.md · 57 lines

What it actually says

API Audit Skill

Comprehensive auditing of API designs, contracts, error handling strategies, versioning approaches, and integration patterns.

USE FOR

Reviewing API endpoint definitions and route structures
Validating request and response contracts (OpenAPI, schemas)
Assessing HTTP status code usage and error handling patterns
Evaluating API versioning strategies and deprecation practices
Analyzing documentation completeness and accuracy
Reviewing authentication and authorization patterns
Assessing rate limiting, throttling, and quota strategies
Evaluating consistency across API endpoints
Identifying breaking changes and integration risks
Creating structured audit findings with recommendations

DO NOT USE FOR

Implementing API endpoints (use api-design or backend-dev skills)
Writing backend code
Database schema design
Frontend development or client implementation
Infrastructure provisioning
General code review (use code-review skill)

Audit Checklist

Endpoint Design: Naming conventions, HTTP verbs, parameter placement
Contracts: Request/response schemas, type definitions, examples
Error Handling: Status codes, error responses, failure scenarios
Versioning: Strategy, deprecation policy, migration path
Documentation: Completeness, accuracy, usability
Security: Authentication, authorization, data protection
Performance: Caching headers, pagination, filtering
Consistency: Patterns, naming, response structure uniformity
Integration: Backwards compatibility, changelog, client guidance

api-design — Designing new API contracts and endpoints
backend-audit — Reviewing backend implementation quality
api-security — Security-focused API assessment
contract-testing — Contract testing and verification

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.

3d ago First seen · 57 lines · 70 tokens per session scan A 5ef4ed204d08

Subscribe to this mod's changes

api-audit is a skill published in the GitHub repository ivegamsft/basecoat (4 stars, last pushed 3d ago), licensed MIT. It adds 70 tokens to every session and 483 once invoked, about $0.0003 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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