Subagent

Semgrep Scanner

Executes Semgrep CLI scans for a specific language category and produces SARIF output. Spawned by the semgrep skill as a parallel worker —…

Type: Subagent
Repository: trailofbits/skills
GitHub stars: 7.3k
License: CC-BY-SA-4.0
Repo last updated: Sep 25, 2026
Source file: README.md

What Semgrep Scanner is

Semgrep Scanner is a subagent published in the trailofbits/skills repository on GitHub, which has about 7.3k stars. The repository describes itself as: “Trail of Bits Claude Code skills for security research, vulnerability detection, and audit workflows”

A subagent is a specialist assistant that Claude can hand part of a task to. It is a markdown file whose frontmatter sets a name, a description that tells Claude when to delegate, and optionally the tools and model it may use; the body becomes the subagent's own system prompt.

Because a subagent works in its own context, it keeps the main conversation focused: Claude can send a narrow job, such as a review or a specialised analysis, to Semgrep Scanner and get back a compact result.

How to install Semgrep Scanner

Claude Code

Download README.md from the repository.
Save it to ~/.claude/agents/ to use it in every project, or to .claude/agents/ inside one project to share it through version control.
Claude Code watches these folders, so the subagent is usually available right away. Ask Claude to use it by name, or @-mention it to make sure it runs.

Claude Cowork

Cowork loads subagents through plugins. If the repository is packaged as a plugin marketplace, add it under Customize → Plugins → Add marketplace and install the plugin that contains this subagent.
Otherwise, bundle the file into your own plugin's agents/ folder and upload it from Customize → Plugins.

New to extending Cowork? Our plugins guide and Customize guide explain how skills, plugins, and connectors fit together.

Inside the source file

An excerpt from README.md, shared under the repository's CC-BY-SA-4.0 license. Read the full file on GitHub.

A Claude Code plugin marketplace from Trail of Bits providing skills to enhance AI-assisted security analysis, testing, and development workflows. Codex can load this marketplace through its Claude marketplace compatibility.

> Also see: claude-code-config · codex-config · skills-curated · claude-code-devcontainer · dropkit · coop

Installation

Claude Code Marketplace

/plugin marketplace add trailofbits/skills

Browse and Install Plugins

/plugin menu

Codex

Codex supports Claude plugin marketplaces directly, so this repository does not need Codex-specific sidecar metadata.

Install the marketplace with:

codex plugin marketplace add trailofbits/skills
codex plugin list
codex plugin add <plugin-name>@trailofbits

ChatGPT Workspace Marketplace

Use this repository's .claude-plugin/marketplace.json for workspace imports. Skills that include agents/openai.yaml also need interface.display_name and interface.short_description in that YAML file; plugin metadata does not supply them. After a metadata fix is published, sync the repository again in your workspace marketplace to retry failed imports.

Local Development

To add the marketplace locally (e.g., for testing or development), navigate to the parent directory of this repository:

cd /path/to/parent  # e.g., if repo is at ~/projects/skills, be in ~/projects
/plugins marketplace add ./skills

Available Plugins

Smart Contract Security

Code Auditing

Malware Analysis

Verification

Reverse Engineering

Mobile Security

Development

Team Management

Tooling

Trophy Case

Bugs discovered using Trail of Bits Skills. Found something? Let us know!

When reporting bugs you've found, feel free to mention: > Found using Trail of Bits Skills

Contributing

We welcome contributions! See AGENTS.md for skill authoring guidelines, and run make check before you push — it runs most of CI locally (see AGENTS.md for what it does not cover).

License

This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. Made by Trail of Bits.

Before you install

Read the whole file first. Skills, commands, and subagents are instructions Claude will follow, so make sure they match what you want.
Check which tools, scripts, or MCP servers it uses. Local servers and scripts run with your permissions.
Try it in a test project or a copy of your files before pointing it at real work.
Pin the version you tested, and review changes before updating.
Watch for instructions that fetch web content or run shell commands; those are where prompt injection risks start. See our prompt injection guide.

FAQ

What is Semgrep Scanner?

Semgrep Scanner is a subagent for Claude Code and Claude Cowork from the trailofbits/skills repository on GitHub. Executes Semgrep CLI scans for a specific language category and produces SARIF output. Spawned by the semgrep skill as a parallel worker —…

How do I install Semgrep Scanner in Claude Code?

Download README.md from the repository. Save it to ~/.claude/agents/ to use it in every project, or to .claude/agents/ inside one project to share it through version control. Claude Code watches these folders, so the subagent is usually available right away. Ask Claude to use it by name, or @-mention it to make sure it runs.

Can I use Semgrep Scanner in Claude Cowork?

Cowork loads subagents through plugins. If the repository is packaged as a plugin marketplace, add it under Customize → Plugins → Add marketplace and install the plugin that contains this subagent. Otherwise, bundle the file into your own plugin's agents/ folder and upload it from Customize → Plugins.

Is Semgrep Scanner safe to install?

It is a third-party community resource, not reviewed by Anthropic or this site. Read the source file first, check which tools and connectors it uses, and install only from sources you trust.

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Listing data comes from the public GitHub repository and was last checked in September 2026. Excerpts are © their authors and shared under CC-BY-SA-4.0. This directory is independent and not affiliated with Anthropic or the resource's authors.