Cs Pen Tester
Offensive security specialist for engagement planning, red-team exercises, and threat-signal analysis under authorized scopes
- Type
- Subagent
- Repository
- borghei/Claude-Skills
- GitHub stars
- 834
- License
- Not declared
- Repo last updated
- Sep 21, 2026
- Source file
- agents/engineering/cs-pen-tester.md
- Model
- sonnet
What Cs Pen Tester is
Cs Pen Tester is a subagent published in the borghei/Claude-Skills repository on GitHub, which has about 834 stars. The repository describes itself as: “372 AI skills, 76 expert agents, and 867 stdlib Python tools for every team: engineering, PM, marketing, C-level, compliance, business ops, and research. Installs on Claude Code, Cursor, Codex, Gemini, Copilot, and 6 other AI assistants.”
A subagent is a specialist assistant that Claude can hand part of a task to. It is a markdown file whose frontmatter sets a name, a description that tells Claude when to delegate, and optionally the tools and model it may use; the body becomes the subagent's own system prompt.
Because a subagent works in its own context, it keeps the main conversation focused: Claude can send a narrow job, such as a review or a specialised analysis, to Cs Pen Tester and get back a compact result.
It is set up to use these tools: Read, Write, Bash, Grep, Glob. Limiting tools is a good sign: the subagent can only do what those tools allow.
How to install Cs Pen Tester
Claude Code
- Download cs-pen-tester.md from the repository.
- Save it to ~/.claude/agents/ to use it in every project, or to .claude/agents/ inside one project to share it through version control.
- Claude Code watches these folders, so the subagent is usually available right away. Ask Claude to use it by name, or @-mention it to make sure it runs.
Claude Cowork
- Cowork loads subagents through plugins. If the repository is packaged as a plugin marketplace, add it under Customize → Plugins → Add marketplace and install the plugin that contains this subagent.
- Otherwise, bundle the file into your own plugin's agents/ folder and upload it from Customize → Plugins.
New to extending Cowork? Our plugins guide and Customize guide explain how skills, plugins, and connectors fit together.
Inside the source file
The repository does not declare an open-source license, so we list only the outline of the file here. Read the full text on GitHub.
- Purpose
- Skill Integration
- Python Tools
- Knowledge Bases
- Workflows
- Workflow 1: Engagement Planning
- Workflow 2: Methodology-Driven Testing
- Workflow 3: Detection Coverage Review
- Integration Examples
- Example 1: Engagement Kickoff
- Example 2: Post-Exercise Analysis
- Success Metrics
- Related Agents
- References
Before you install
- Read the whole file first. Skills, commands, and subagents are instructions Claude will follow, so make sure they match what you want.
- Check which tools, scripts, or MCP servers it uses. Local servers and scripts run with your permissions.
- Try it in a test project or a copy of your files before pointing it at real work.
- Pin the version you tested, and review changes before updating.
- Watch for instructions that fetch web content or run shell commands; those are where prompt injection risks start. See our prompt injection guide.
FAQ
What is Cs Pen Tester?
Cs Pen Tester is a subagent for Claude Code and Claude Cowork from the borghei/Claude-Skills repository on GitHub. Offensive security specialist for engagement planning, red-team exercises, and threat-signal analysis under authorized scopes
How do I install Cs Pen Tester in Claude Code?
Download cs-pen-tester.md from the repository. Save it to ~/.claude/agents/ to use it in every project, or to .claude/agents/ inside one project to share it through version control. Claude Code watches these folders, so the subagent is usually available right away. Ask Claude to use it by name, or @-mention it to make sure it runs.
Can I use Cs Pen Tester in Claude Cowork?
Cowork loads subagents through plugins. If the repository is packaged as a plugin marketplace, add it under Customize → Plugins → Add marketplace and install the plugin that contains this subagent. Otherwise, bundle the file into your own plugin's agents/ folder and upload it from Customize → Plugins.
Is Cs Pen Tester safe to install?
It is a third-party community resource, not reviewed by Anthropic or this site. Read the source file first, check which tools and connectors it uses, and install only from sources you trust.
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