An audit of an application's APIs, which are the interfaces through which software exchanges data. It checks endpoint behavior across ten main areas, with optional checks for contract stability and common API security risks.

It helps assess endpoints before releases, after adding APIs, or when investigating issues such as excessive data fetching, slow request chains, pagination errors, authentication gaps, and unstable response contracts.

API problems can cause invalid data, inconsistent errors, inefficient requests, broken client integrations, or security weaknesses that are easy to miss in ordinary code review.

api-audit — Skill for Claude Code by greglas75/zuvo

Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo

git clone --depth 1 https://github.com/greglas75/zuvo

agentmods

npx agentmods add skills/greglas75/zuvo/api-audit

Made for: Claude Code.

Or install zuvo, the plugin that ships this one along with the rest of its 57 skills, 48 agents, 5 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/greglas75/zuvo/api-audit/github.svg)](https://agentmods.dev/skills/greglas75/zuvo/api-audit)

Your own site

<a href="https://agentmods.dev/skills/greglas75/zuvo/api-audit"><img src="https://agentmods.dev/badge/skills/greglas75/zuvo/api-audit/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/greglas75/zuvo/api-audit"><img src="https://agentmods.dev/badge/skills/greglas75/zuvo/api-audit.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 135 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 8,644 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

NVIDIA SkillSpector warn 7 Sept 2026

SkillSpector: 3 findings, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

medium Output Handling · line 244
Output size or generation rate is not bounded. Unbounded output enables denial-of-service through resource exhaustion, log flooding, or context-window stuffing.

Fix: Set explicit limits on output length, generation count, and rate. Use max_tokens and truncation to prevent unbounded output.
medium Excessive Agency · line 270
Skill allows unbounded resource consumption (API calls, storage, compute). Without rate limits or quotas, a compromised or misbehaving agent can cause denial-of-service or cost overruns.

Fix: Set explicit rate limits, timeouts, and resource quotas for API calls, file operations, and compute. Implement circuit breakers for runaway loops.
medium Rogue Agent · line 529
Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.

Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.

How audits are shown

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	$0.00135	$0.08644
Opus 5.5	$0.00054	$0.03458
Sonnet 5.5	$0.00027	$0.01729
Haiku 4.5	$0.00014	$0.00864

Measured today against content hash c7e9a6636b6e, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

api-audit scanned grade A with 1 finding 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 today.

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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

| `TIMEOUT` | curl `--max-time` | NO (default 15) |

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

cli-audit-test — 88% identical, 693 lines differ

skills/api-audit/SKILL.md · 612 lines

How it starts

The opening of the file, as written. The whole thing — 612 lines — stays where its author put it; the contents beside it link to each section on GitHub.

zuvo:api-audit — API and Endpoint Integrity Audit

Standalone audit of how the application exposes, consumes, and validates data across API boundaries. Evaluates endpoints through 10 weighted dimensions, builds an auth matrix, and runs cross-cutting analysis on contract consistency, money field representation, and payload efficiency.

When to use: Periodic health check of the API layer, before major releases, after adding new endpoints, when investigating overfetching or waterfall issues. Out of scope: Single-file code review (use zuvo:review), refactoring (use zuvo:refactor), security posture analysis (use zuvo:security-audit), feature development (use zuvo:build).

Argument Parsing

Argument	Effect
`full`	Audit all endpoints in the project
`[path]`	Audit endpoints in a specific directory or module
`--static`	Static analysis only -- skip Phase 2 (GET probing). Use when no running server is available.
`--security`	Activate D12 (OWASP API Security Top 10): BOLA, BOPLA/mass-assignment, BFLA, JWT alg-confusion, sensitive business flows, shadow endpoints, GraphQL introspection/depth. Auto-activates when an auth surface is detected.

Mandatory File Loading

Read these files from disk before starting. Print the checklist. Do not proceed from memory.

CORE FILES LOADED:
  1. ../../rules/cq-checklist.md            -- READ/MISSING
  2. ../../rules/security.md                -- READ/MISSING
  3. ../../shared/includes/env-compat.md    -- READ/MISSING
  4. ../../shared/includes/codesift-setup.md -- READ/MISSING
  5. ../../shared/includes/run-logger.md    -- READ/MISSING
  6. ../../shared/includes/retrospective.md    -- READ/MISSING

If any file is missing: Stop. The audit requires the full rule set to score correctly.

Environment Compatibility

Dispatch follows ../../shared/includes/execution-policy.md through env-compat. Reuse existing authorization within that policy; session restrictions take precedence. Run each required gate and report its actual independence or an unmet requirement.

Read the full file on GitHub · 612 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.

today Changed c7e9a6636b6e
8d ago Changed · +2 lines 912c80051d4b
1mo ago Changed · -2 lines 5078b248b6bc
1mo ago First seen · 612 lines · 135 tokens per session scan A a6bb2e9727ca

Subscribe to this mod's changes

api-audit is a skill published in the GitHub repository greglas75/zuvo (8 stars, last pushed today), licensed MIT. It adds 135 tokens to every session and 8,644 once invoked, about $0.0005 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Backend and APIs Claude Code Code review Code/Test audits Security Testing ai-coding claude-code-plugin code-quality codex

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api-audit