MCP Scanner is a Python tool that examines Model Context Protocol servers and tools for security findings and potential threats. It can run as a command-line tool or REST API and uses YARA rules, LLM analysis, Cisco AI Defense, dependency checks, and other scans.
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.
git clone --depth 1 https://github.com/cisco-ai-defense/mcp-scannerWrote 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.
[](https://agentmods.dev/plugins/cisco-ai-defense/mcp-scanner/claude-code-plugin)<a href="https://agentmods.dev/plugins/cisco-ai-defense/mcp-scanner/claude-code-plugin"><img src="https://agentmods.dev/badge/plugins/cisco-ai-defense/mcp-scanner/claude-code-plugin/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/plugins/cisco-ai-defense/mcp-scanner/claude-code-plugin"><img src="https://agentmods.dev/badge/plugins/cisco-ai-defense/mcp-scanner/claude-code-plugin.svg" alt="Reviewed on agentmods" width="80" height="20"></a>Grade A, and why
mcp-scanner 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 1mo 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.
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"]
}
What it installs
The manifest is a name and a version. 1 skill, 9 commands travel with it, and installing the plugin installs all of them — 187 tokens a session between them. Each is measured on its own page, and each can be installed alone.
- Skill mcp-security-scan A 64 tokens
- Command scan-static A 16 tokens
- Command deep-scan A 20 tokens
- Command scan-behavioral A 16 tokens
- Command quick-scan A 15 tokens
- Command scan-config A 9 tokens
- Command scan-known-configs A 20 tokens
- Command scan-prompts A 10 tokens
- Command scan-remote A 10 tokens
- Command scan-resources A 7 tokens
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.
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.
- 1mo ago First seen · 12 lines scan A 549a02ba9d18
mcp-scanner is a plugin published in the GitHub repository cisco-ai-defense/mcp-scanner (1,094 stars, last pushed yesterday), 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.
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