agentmods.dev

semgrep

semgrep is a plugin for Claude Code from semgrep/guardian. Its manifest loads nothing; the 3 skills, 5 hooks, 1 MCP server it bundles cost 287 tokens per session together, scanned A, original, no licence file.

A Semgrep Guardian plugin that scans code generated by an agent for security vulnerabilities. Semgrep is a code-scanning tool that looks for known unsafe patterns.

In plain words
What is it for?
It is for checking agent-written code for possible security vulnerabilities.
Why use it?
It helps detect security problems in generated code during the agent's work.

Plugin for Claude Code

Written for Claude Code: a Claude Code plugin manifest.

not rated 17repo changed 5d ago A scan tokens not measured no licence

Good fit It is for checking agent-written code for possible security vulnerabilities.

Compare 6 plugins from other repositories ↓
Install in Claude Code
/plugin marketplace add semgrep/guardian
/plugin install semgrep
View source ↗ semgrep/guardian semgrep.dev
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.

Clone the repo
git clone --depth 1 https://github.com/semgrep/guardian

Made for: Claude Code.

Wrote 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.

agentmods badge for semgrep

README.md
[![agentmods](https://agentmods.dev/badge/plugins/semgrep/guardian/plugin/github.svg)](https://agentmods.dev/plugins/semgrep/guardian/plugin)
Your own site
<a href="https://agentmods.dev/plugins/semgrep/guardian/plugin"><img src="https://agentmods.dev/badge/plugins/semgrep/guardian/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.

agentmods 80×15 button for semgrep

Your own site · 80×15
<a href="https://agentmods.dev/plugins/semgrep/guardian/plugin"><img src="https://agentmods.dev/badge/plugins/semgrep/guardian/plugin.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session not measured What this adds to a session before it is invoked.
When invoked not measured The manifest loads nothing itself; its 3 skills, 5 hooks, 1 MCP server cost 287 tokens a session between them.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown No closer match found in the catalogue.
Security

Grade A, and why

semgrep 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 5d 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.

plugin/.claude-plugin/plugin.json · 10 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Contents

What it installs

The manifest is a name and a version. 3 skills, 5 hooks, 1 MCP server travel with it, and installing the plugin installs all of them — 287 tokens a session between them. Each is measured on its own page, and each can be installed alone.

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. 5d ago Changed 29934fdb4aa0
  2. 8d ago Changed 250a198077d2
  3. 9d ago Changed f1858f1a8f3b
  4. 16d ago Changed 48057dc08f19
  5. 17d ago Changed 7a751d2a91ea
  6. 23d ago Changed 6299d7056a76
  7. 1mo ago Changed 1ca4ba7f9ae0
  8. 1mo ago Changed 4b31d0e1e451
  9. 1mo ago First seen · 10 lines scan A ab9f41672d35

Subscribe to this mod's changes

semgrep is a plugin published in the GitHub repository semgrep/guardian (17 stars, last pushed 6d ago), with no licence file. 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.

Security
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