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Agent skill

Cors Testing

by NeoTheCapt in NeoTheCapt/RedteamAgent

CORS misconfiguration testing for data theft and access control bypass

No licenceAuto-check passedSecurity

Install Cors Testing

skills CLI
$ npx skills add NeoTheCapt/RedteamAgent --skill cors-testing -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install NeoTheCapt/RedteamAgent cors-testing --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/NeoTheCapt/RedteamAgent.git skills-src && mkdir -p .claude/skills && cp -r skills-src/agent/skills/cors-testing .claude/skills/cors-testing && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
cors-testing
GitHub stars
142
Token cost
~904 tokens
SKILL.md length
339 words
Files
1
Skills in repo
25
Repo updated
First seen
Licence
None found

At a glance

CORS misconfiguration testing for data theft and access control bypass

  • Works in 8 steps: Baseline Check → Origin Reflection Test → Null Origin → …
  • Tasks that involve Web application vulnerabilities
  • SKILL.md covers When to Activate, Tools, Methodology and What to Record
  • Reaches eviltarget.com

What it does

Cors Testing is an agent skill from NeoTheCapt/RedteamAgent. CORS misconfiguration testing for data theft and access control bypass

Its SKILL.md is about 900 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Security, covering Web application vulnerabilities, Authorization and RBAC and Penetration testing. The repository describes itself as: An AI red-team agent for authorized labs and web app pentesting workflows. Turns Claude Code / OpenCode / Codex into a structured recon → test → exploit → report workflow, with…

When your agent uses it

  • Tasks that involve Web application vulnerabilities
  • Tasks that involve Authorization and RBAC
  • Tasks that involve Penetration testing

Example prompts

  • “/cors-testing”

Workflow steps

8 steps, taken from the step headings in SKILL.md.

  1. Baseline Check
  2. Origin Reflection Test
  3. Null Origin
  4. Subdomain / Domain Variations
  5. Wildcard Misconfiguration
  6. Preflight Bypass
  7. Build Exploitation PoC
  8. Impact Assessment

What it can do on your machine

Read from SKILL.md and the folder at commit 2e60476. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    Hosts in commands or code, which the agent is likely to contact:

    • eviltarget.com

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Cors Testing loads about 904 tokens when it runs. Until then it costs about 21 tokens; SKILL.md has 339 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~21
When it runs · the whole SKILL.md, loaded when a task matches
~904

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

Without a licence we can't republish the file, so here is its outline and opening line. It has 339 words (~904 tokens).

name
cors-testing
origin
RedteamOpencode

Read the full SKILL.md on GitHub

Files

Just SKILL.md in agent/skills/cors-testing of NeoTheCapt/RedteamAgent.

Open the folder on GitHubat commit 2e60476

Compare with similar skills

Cors Testing next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Cors Testing compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Cors Testing this skillNeoTheCapt/RedteamAgent142—~904Automated safety check: PassNone
Strix Code Vulnerability Scanusestrix/strix67k—~1.1kAutomated safety check: PassApache-2.0
Idor Testingzebbern/claude-code-guide4.7k8 repos~3.1kAutomated safety check: PassMIT
Securitytelagod/code-abyss243—~907Automated safety check: PassMIT
Openfdd Mt Securitybbartling/open-fdd172—~2.2kAutomated safety check: PassCustom licence
Code Audit3stoneBrother/code-audit8931 repos~2.7kAutomated safety check: PassNone

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Categories

Questions about Cors Testing

What does Cors Testing do?

CORS misconfiguration testing for data theft and access control bypass. Cors Testing is an agent skill from NeoTheCapt/RedteamAgent.

When should I use Cors Testing?

Cors Testing fits situations like: tasks that involve Web application vulnerabilities; tasks that involve Authorization and RBAC; tasks that involve Penetration testing.

How do I install Cors Testing in Claude Code?

Run `npx skills add NeoTheCapt/RedteamAgent --skill cors-testing -a claude-code`. Or copy the skill folder (agent/skills/cors-testing in NeoTheCapt/RedteamAgent) into .claude/skills/cors-testing in your project. Claude Code loads it when a task matches its description.

How do I install Cors Testing in Codex?

Run `npx skills add NeoTheCapt/RedteamAgent --skill cors-testing -a codex`. Or copy the skill folder (agent/skills/cors-testing in NeoTheCapt/RedteamAgent) into .agents/skills/cors-testing in your project. Codex loads it when a task matches its description.

Can I use Cors Testing in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add NeoTheCapt/RedteamAgent --skill cors-testing -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/cors-testing, .gemini/skills/cors-testing, .github/skills/cors-testing and .opencode/skills/cors-testing in your project.

What does Cors Testing need to run?

SKILL.md names no scripts, command-line tools or credentials: Cors Testing is instructions for the agent only.

Does Cors Testing access the network?

SKILL.md names 1 domain. In commands or code: eviltarget.com; the agent is likely to contact it when it follows the instructions. This is read from the text; nothing was executed.

Is Cors Testing safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Cors Testing use?

No licence was found for Cors Testing or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.

How many tokens does Cors Testing use?

About 904 tokens (SKILL.md is roughly 3.6k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Cors Testing?

Skills that share tags, products or a category with Cors Testing: Strix Code Vulnerability Scan (usestrix/strix, 67k stars), Idor Testing (zebbern/claude-code-guide, 4.7k stars), Security (telagod/code-abyss, 243 stars) and Openfdd Mt Security (bbartling/open-fdd, 172 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Cors Testing?

NeoTheCapt (a GitHub user) maintains it in NeoTheCapt/RedteamAgent, which has 142 GitHub stars. The repository holds 25 skills in this directory. The repository was last updated on August 2, 2026.

Source: NeoTheCapt/RedteamAgent on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.