https://github.com/snyk/agent-scan

Security scanner for AI agents, MCP servers and agent skills.
https://github.com/snyk/agent-scan

agent ai mcp modelcontextprotocol security

Last synced: 20 days ago
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Security scanner for AI agents, MCP servers and agent skills.

Host: GitHub
URL: https://github.com/snyk/agent-scan
Owner: snyk
License: apache-2.0
Created: 2025-04-07T14:31:26.000Z (about 1 year ago)
Default Branch: main
Last Pushed: 2026-04-07T11:24:02.000Z (20 days ago)
Last Synced: 2026-04-07T11:26:24.353Z (20 days ago)
Topics: agent, ai, mcp, modelcontextprotocol, security
Language: Python
Homepage:
Size: 2.63 MB
Stars: 2,069
Watchers: 14
Forks: 197
Open Issues: 24
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- License: LICENSE
- Codeowners: .github/CODEOWNERS
- Security: SECURITY.md

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README

          


  


  Snyk Agent Scan

  




  Discover and scan agent components on your machine for prompt injections


  and vulnerabilities (including agents, MCP servers, skills).



> **NEW** Read our [technical report on the emerging threats of the agent skill eco-system](.github/reports/skills-report.pdf) published together with Agent Scan 0.4, which adds support for scanning agent skills.



  

  

  





  






Agent Scan helps you keep an inventory of all your installed agent components (harnesses, MCP servers, and skills) and scans them for common threats like prompt injections, sensitive data handling, or malware payloads hidden in natural language. **By default** it focuses on MCP servers; add `--skills` to autodiscover and scan agent skills.

## Highlights

- Auto-discover MCP configurations, agent tools, skills

- Scanning of Claude, Cursor, Windsurf, Gemini CLI, and other agents.

- Detects [15+ distinct security risks](docs/issue-codes.md) across MCP servers and agent skills:

  - MCP: [Prompt Injection](docs/issue-codes.md#E001), [Tool Poisoning](docs/issue-codes.md#E001), [Tool Shadowing](docs/issue-codes.md#E002), [Toxic Flows](docs/issue-codes.md#ToxicFlows)

  - Skills: [Prompt Injection](docs/issue-codes.md#E004), [Malware Payloads](docs/issue-codes.md#E006), [Untrusted Content](docs/issue-codes.md#W011), [Credential Handling](docs/issue-codes.md#W007), [Hardcoded Secrets](docs/issue-codes.md#W008)

## Supported agents and capabilities

Agent Scan auto-discovers agents and their capabilities (MCP servers or skills) when their install paths exist. The table reflects [well-known agent definitions](src/agent_scan/well_known_clients.py).

- **✓**: at least one path is defined for that capability.

- **✗**: the agent is listed for that OS but has no paths for that capability.

- **—**: that agent is not included for that OS.

- **Skills** columns apply when using `--skills`.

| Agent | macOS MCP | macOS Skills | Linux MCP | Linux Skills | Windows MCP | Windows Skills |

| --- | :---: | :---: | :---: | :---: | :---: | :---: |

| Windsurf | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |

| Cursor | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |

| VS Code | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |

| Claude Desktop | ✓ | ✗ | — | — | ✓ | ✗ |

| Claude Code | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |

| Gemini CLI | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |

| OpenClaw | ✗ | ✓ | ✗ | ✓ | ✗ | ✓ |

| Kiro | ✓ | ✗ | ✓ | ✗ | ✓ | ✗ |

| OpenCode | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ |

| Antigravity | ✓ | ✗ | ✓ | ✗ | ✓ | ✗ |

| Codex | ✗ | ✓ | ✗ | ✓ | — | — |

| Amazon Q | ✓ | ✗ | ✓ | ✗ | ✗ | ✗ |

## Quick Start

To get started:

1. **Sign up at [Snyk](https://snyk.io)** and get an API token from [https://app.snyk.io/account](https://app.snyk.io/account) (API Token → KEY → click to show).

2. **Set the token as an environment variable** before running any scan:

   ```bash

   export SNYK_TOKEN=your-api-token-here

   ```

3. Have [uv](https://docs.astral.sh/uv/getting-started/installation/) installed on your system.

### Scanning

To run a full scan of your machine (auto-discovers agents, MCP servers, skills), run:

```bash

uvx snyk-agent-scan@latest

```

This will scan for security vulnerabilities in MCP servers, tools, prompts, and resources. It will automatically discover a variety of agent configurations, including Claude Code/Desktop, Cursor, Gemini CLI, and Windsurf.

To also auto-discover and scan agent skills, pass the `--skills` flag:

```bash

uvx snyk-agent-scan@latest --skills

```

You can also scan particular MCP configuration files or skills:

```bash

# scan a specific mcp configuration

uvx snyk-agent-scan@latest ~/.vscode/mcp.json

# scan a single agent skill

uvx snyk-agent-scan@latest --skills ~/path/to/my/SKILL.md

# scan all claude skills

uvx snyk-agent-scan@latest --skills ~/.claude/skills

```

#### Example Run

[![Agent Scan security vulnerabilities demo](demo.svg)](https://asciinema.org/a/716858)

## Scanner Capabilities

Agent Scan is a security scanning tool to both scan and inspect the supply chain of agent components on your machine. It scans for common security vulnerabilities like prompt injections, tool poisoning, toxic flows, or vulnerabilities in agent skills.

Agent Scan operates in two main modes which can be used jointly or separately:

1. **Scan Mode**: The CLI command `snyk-agent-scan` scans the current machine for agents and agent components such as skills and MCP servers. Upon completion, it will output a comprehensive report for the user to review.

2. **Background Mode** (MDM, Crowdstrike). Agent Scan scans the machine in regular intervals in the background, and reports the results to a [Snyk Evo](https://evo.ai.snyk.io) instance. This can be used by security teams to monitor the company-wide agent supply chain in a central location. To set this up, please [contact us](https://evo.ai.snyk.io/#contact-us).

## How It Works

### Scanning

Agent Scan searches through your local agent's configuration files to find agents, skills, and MCP servers. For MCP, it connects to servers and retrieves tool descriptions.

It then validates the components, both with local checks and by invoking the Agent Scan API. For this, skills, agent applications, tool names, and descriptions are shared with Snyk. By using Agent Scan, you agree to the Snyk [terms of use for Agent Scan](./TERMS.md).

A unique, persistent, and anonymous ID is assigned to your scans for analysis. You can opt out of sending this information using the `--opt-out` flag.

Agent Scan does not store or log any usage data, i.e. the contents and results of your MCP tool calls.

## CLI Parameters

Agent Scan provides the following commands:

```

snyk-agent-scan - Security scanner for agents, MCP servers, and skills

```

### Common Options

These options are available for all commands:

```

--storage-file FILE    Path to store scan results and scanner state (default: ~/.mcp-scan)

--base-url URL         Base URL for the verification server

--verbose              Enable detailed logging output

--print-errors         Show error details and tracebacks

--json                 Output results in JSON format instead of rich text

```

### Commands

#### scan (default)

Scan MCP configurations for security vulnerabilities in tools, prompts, and resources.

```

snyk-agent-scan scan [CONFIG_FILE...]

```

Options:

```

--skills                          Also scan agent skills (default: off)

--checks-per-server NUM           Number of checks to perform on each server (default: 1)

--server-timeout SECONDS          Seconds to wait before timing out server connections (default: 10)

--suppress-mcpserver-io BOOL      Suppress stdout/stderr from MCP servers (default: True)

```

#### inspect

Print descriptions of tools, prompts, and resources without verification.

```

snyk-agent-scan inspect [CONFIG_FILE...]

```

Options:

```

--server-timeout SECONDS      Seconds to wait before timing out server connections (default: 10)

--suppress-mcpserver-io BOOL  Suppress stdout/stderr from MCP servers (default: True)

```

#### help

Display detailed help information and examples.

```bash

snyk-agent-scan help

```

### Examples

```bash

# Scan all known MCP configs

snyk-agent-scan

# Scan all known MCP configs and agent skills

snyk-agent-scan --skills

# Scan a specific config file

snyk-agent-scan ~/custom/config.json

# Scan a specific skill file

snyk-agent-scan --skills ~/path/to/my/SKILL.md

# Scan a directory for skills

snyk-agent-scan --skills ~/.claude/skills

# Just inspect tools without verification

snyk-agent-scan inspect

```

## Demo

This repository includes a vulnerable MCP server that can demonstrate Model Context Protocol security issues that Agent Scan finds.

How to demo MCP security issues?

1. Clone this repository

2. Create an `mcp.json` config file in the cloned git repository root directory with the following contents:

```jsonc

{

  "mcpServers": {

    "Demo MCP Server": {

      "type": "stdio",

      "command": "uv",

      "args": ["run", "mcp", "run", "demoserver/server.py"],

    },

  },

}

```

3. Run Agent Scan: `uvx --python 3.13 snyk-agent-scan@latest scan --full-toxic-flows mcp.json`

Note: if you place the `mcp.json` configuration filepath elsewhere then adjust the `args` path inside the MCP server configuration to reflect the path to the MCP Server (`demoserver/server.py`) as well as the `uvx` command that runs Agent Scan with the correct filepath to `mcp.json`.

## Agent Scan is closed to contributions

Agent Scan does not accept external contributions at this time.

We welcome suggestions, bug reports, or feature requests as GitHub issues.

## Development Setup

To run Agent Scan from source, follow these steps:

```bash

uv run pip install -e .

uv run -m src.agent_scan.cli

```

## Including Agent Scan results in your own project / registry

If you want to include Agent Scan results in your own project or registry, please [reach out](https://evo.ai.snyk.io/#contact-us). There are designated APIs for this purpose. Using the standard Agent Scan API for large scale scanning is considered abuse and will result in your account being blocked.

## Documentation

- [Scanning](docs/scanning.md) — How scanning works, CLI parameters, and usage examples.

- [Issue Codes](docs/issue-codes.md) — Reference for all security issues detected by Agent Scan.

## Further Reading

- [Introducing MCP-Scan](https://invariantlabs.ai/blog/introducing-mcp-scan)

- [MCP Security Notification Tool Poisoning Attacks](https://invariantlabs.ai/blog/mcp-security-notification-tool-poisoning-attacks)

- [WhatsApp MCP Exploited](https://invariantlabs.ai/blog/whatsapp-mcp-exploited)

- [MCP Prompt Injection](https://simonwillison.net/2025/Apr/9/mcp-prompt-injection/)

- [Toxic Flow Analysis](https://invariantlabs.ai/blog/toxic-flow-analysis)

- [Skills Report](.github/reports/skills-report.pdf)

## Changelog

See [CHANGELOG.md](CHANGELOG.md).

ecosyste.ms

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Snyk Agent Scan