A local MCP server that provides authorized offensive-security tools for reconnaissance, vulnerability information, JavaScript analysis, and port scanning. It requires an approved scope and two environment variables to run.

Reconnaissance, looking up CVE vulnerability data, analyzing JavaScript, and scanning ports within the configured scope.

It gathers several security-testing tasks in an AI client while restricting work to explicitly authorized targets.

offsec — MCP server by nadirzhon

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 mcp/nadirzhon/offsec-mcp/offsec

Clone the repo

git clone --depth 1 https://github.com/nadirzhon/offsec-mcp

Made for: Claude Code, Codex, Cursor, Gemini CLI, OpenCode.

Per session not measured What this adds to a session before it is invoked.

When invoked not measured Not applicable: nothing here is loaded into a session.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Security

Grade A, and why

offsec scanned grade A with 0 findings 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.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

examples/claude_desktop_config.json · 12 lines

What it actually says

{
  "offsec": {
    "command": "uvx",
    "args": [
      "offsec-mcp"
    ],
    "env": {
      "OFFSEC_SCOPE": "example.com,*.staging.example.com,10.0.0.0/24",
      "NVD_API_KEY": ""
    }
  }
}

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.

yesterday First seen · 12 lines scan A 27c8745850ec

Subscribe to this mod's changes

offsec is an MCP server published in the GitHub repository nadirzhon/offsec-mcp (0 stars, last pushed 24d ago), licensed MIT. Its token cost is not measured: an MCP server costs its tool schemas, not its config file. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

CVE Data and AI Debugging Security ai-agent bug-bounty claude mcp model-context-protocol

brutalist

Deploy Claude Code, Codex & Antigravity (agy) CLI agents to demolish your work before users do. Real file analysis. Brutal honesty. Per-call model pinning, conversation continuation & intelligent pagination. Runs locally from the @brutalist/mcp npm package.

vmihalis/hacker-bob · not measured

offsec

Getting it into your agent

Grade A, and why

Nothing flagged

What it actually says

What this file has done since we first saw it

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