api-agent

api-agent is a skill for Claude Code, Codex from ok-helloworld/vibe-pentest. It costs 56 tokens per session (5,262 once invoked), scanned A, original, AGPL-3.0.

A security-testing guide for application programming interfaces, or APIs, which let software exchange data and perform actions. It covers access-control flaws, GraphQL, parameter changes, hidden parameters, WebSockets, API versions, and excessive data exposure.

In plain words
What is it for?
It is for testing API authorisation, object and function access, request parameters, GraphQL queries, WebSocket connections, version discovery, hidden fields, and response data.
Why use it?
It helps find cases where an API reveals too much information or lets users perform actions they should not be allowed to perform. These issues can exist even when the visible website appears to work correctly.

Skill for Claude CodeCodex

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 skills/ok-helloworld/vibe-pentest/api-agent
Any agent
npx skills add ok-helloworld/vibe-pentest --skill api-agent
Clone the repo
git clone --depth 1 https://github.com/ok-helloworld/vibe-pentest

Made for: Claude Code, Codex.

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-agent

README.md
[![agentmods](https://agentmods.dev/badge/skills/ok-helloworld/vibe-pentest/api-agent.svg)](https://agentmods.dev/skills/ok-helloworld/vibe-pentest/api-agent)
Your own site
<a href="https://agentmods.dev/skills/ok-helloworld/vibe-pentest/api-agent"><img src="https://agentmods.dev/badge/skills/ok-helloworld/vibe-pentest/api-agent.svg" alt="Measured on agentmods" height="20"></a>
Per session 56 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 5,262 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. Scan, not verified.
Origin unknown 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 $0.00056 $0.05262
Opus 5 $0.00028 $0.02631
Sonnet 5 $0.00011 $0.01052
Haiku 4.5 $0.00006 $0.00526

Measured yesterday against content hash 5271c538b819, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

api-agent 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 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.

Makes network callslowCapability

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

- 禁止使用 curl、wget 或其他工具替代。
agents/api-agent/SKILL.md · 263 lines

The source is not reproduced here

Licensed AGPL-3.0

The repository is licensed AGPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

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 Changed 5271c538b819
  2. 5d ago First seen · 263 lines · 56 tokens per session scan A e63e4f45e66f

Subscribe to this mod's changes

api-agent is a skill published in the GitHub repository ok-helloworld/vibe-pentest (295 stars, last pushed yesterday), licensed AGPL-3.0. It adds 56 tokens to every session and 5,262 once invoked, about $0.0003 per session on Opus 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 2026-08-30.

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