claude-code-plugin

A security scanner for MCP servers, which are programs that give AI assistants access to tools, prompts, and data. It uses detection rules and language-model analysis to look for threats such as prompt injection and tool poisoning.

In plain words
What is it for?
For checking MCP tools, prompts, and resources for security threats and risks.
Why use it?
It helps reveal unsafe content or behavior in MCP components before an AI assistant uses them.

Plugin for Claude Code

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.

Claude Code
/plugin marketplace add cisco-ai-defense/mcp-scanner
agentmods
npx agentmods add plugins/cisco-ai-defense/mcp-scanner/claude-code-plugin
Clone the repo
git clone --depth 1 https://github.com/cisco-ai-defense/mcp-scanner

Made for: Claude Code.

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

claude-code-plugin 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 3d 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.

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.

claude-code-plugin/.claude-plugin/plugin.json · 12 lines

What it actually says

{
  "name": "mcp-scanner",
  "description": "Security scanning for MCP servers using YARA rules, LLM analysis, and Cisco AI Defense. Detect prompt injection, tool poisoning, and other threats in MCP tools, prompts, and resources.",
  "version": "1.0.0",
  "author": {
    "name": "Cisco AI Defense"
  },
  "repository": "https://github.com/cisco-ai-defense/mcp-scanner",
  "license": "Apache-2.0",
  "keywords": ["security", "mcp", "scanning", "yara", "threat-detection"]
}
Files

What ships with it

1 file beside plugin.json in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 3d ago First seen · 12 lines scan A 549a02ba9d18

Subscribe to this mod's changes

claude-code-plugin is a plugin published in the GitHub repository cisco-ai-defense/mcp-scanner (1,052 stars, last pushed 4d ago), licensed Apache-2.0. Its token cost is not measured: this kind of file is read by the harness, not the model. 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 2026-08-30.