cors-hunter

cors-hunter is an agent for Claude Code from H-mmer/pentest-agents. It costs 38 tokens per session (760 once invoked), scanned A, original, no licence file.

A security review agent for CORS, the browser rules that control which websites can read responses from another website.

In plain words
What is it for?
Use it to test origin reflection, null-origin handling, and cross-origin requests that include user credentials.
Why use it?
It helps find cross-origin policies that trust the wrong websites or expose authenticated responses to untrusted pages.

Agent for Claude Code

Written for Claude Code: effort in frontmatter. Also seen: model in frontmatter.

Good fit Use it to test origin reflection, null-origin handling, and cross-origin requests that include user credentials.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/h-mmer/pentest-agents/cors-hunter
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/H-mmer/pentest-agents

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.

agentmods badge for cors-hunter

README.md
[![agentmods](https://agentmods.dev/badge/agents/h-mmer/pentest-agents/cors-hunter.svg)](https://agentmods.dev/agents/h-mmer/pentest-agents/cors-hunter)
Your own site
<a href="https://agentmods.dev/agents/h-mmer/pentest-agents/cors-hunter"><img src="https://agentmods.dev/badge/agents/h-mmer/pentest-agents/cors-hunter.svg" alt="Measured on agentmods" height="20"></a>
Per session 38 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 760 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.
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 5.1 $0.00038 $0.00760
Opus 5 $0.00019 $0.00380
Sonnet 5 $0.00008 $0.00152
Haiku 4.5 $0.00004 $0.00076

Measured 9d ago against content hash 0aa8371737af, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

cors-hunter 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 9d 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.

Makes network callslowCapability

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

- Test with real credentialed browser context, not only curl headers.
.claude/agents/cors-hunter.md · 58 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

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. 9d ago First seen · 58 lines · 38 tokens per session scan A 0aa8371737af

Subscribe to this mod's changes

cors-hunter is an agent published in the GitHub repository H-mmer/pentest-agents (836 stars, last pushed 2mo ago), with no licence file. It adds 38 tokens to every session and 760 once invoked, about $0.0002 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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