Semgrep

Semgrep Guardian for coding agents

Detect and resolve vulnerabilities, malicious packages, and hardcoded secrets before agent-generated code gets pushed.

Semgrep Guardian integrates natively with Claude Code to catch security issues before they ship. It bundles the Semgrep MCP server and lifecycle hooks into a single install, and scans files the agent generates using Semgrep Code, Supply Chain, and Secrets. When findings are detected, the agent is prompted to regenerate code until Semgrep returns clean results or you choose to dismiss them.

[!NOTE] This project is under active development. We would love your feedback. Join the #mcp community Slack channel!

:rocket: Installation instructions

Get started in under 2 minutes — follow these five steps inside Claude Code.

1. Start a Claude Code instance:

   claude
   

2. Open the plugin manager:

   /plugin
   

3. Go to Discover, search for Semgrep, and click Install.

4. Tell Claude to load the plugin:

   /reload-plugins
   

5. Ask Claude to login to Semgrep to kickoff onboarding:

   login to semgrep
   

   This calls into the Guardian MCP server. If Claude has trouble, run /clear to restart Claude, or exit and reopen it manually.

What's included in the Semgrep Guardian?

The Semgrep Guardian is a plugin that installs directly into any AI coding agent. It bundles two components; an MCP server and hooks. We ensure every line of AI-generated code is scanned before it ever reaches a pull request. No more delaying PR's due to vulnerabilities generated by AI.

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MCP Server

The agent asks Semgrep and Semgrep answers. The MCP server exposes tools to access Semgrep's findings so the agent can call them directly.

Learn more about the MCP →

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Hooks

Consistent scanning that your team can rely on. Hooks fire on every file write, ensuring a scan regardless of what the agent does.

Learn more about Hooks →

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