semgrep-ruleset-execution

semgrep-ruleset-execution is a skill for Claude Code, Codex from paruff/uFawkesAI. It costs 37 tokens per session (553 once invoked), scanned A, original, MIT.

A source-code scan that runs Semgrep rule collections, including OWASP security rules and rules for TypeScript, Python, Go, Dockerfiles, and Kubernetes files. Semgrep finds code patterns that match those rules.

In plain words
What is it for?
Use it to run selected rulesets against a codebase, validate the findings, and produce a JSON report.
Why use it?
It catches common insecure patterns and project-specific mistakes, such as hardcoded keys, secrets in logs, and unsafe use of exec().

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: mentions Claude Code; installed under .agents/ (shared by several agents); mentions Codex.

Good fit Use it to run selected rulesets against a codebase, validate the findings, and produce a JSON report.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/paruff/ufawkesai/semgrep
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.

Any agent
npx skills add paruff/uFawkesAI --skill semgrep
Clone the repo
git clone --depth 1 https://github.com/paruff/uFawkesAI

Made for: Claude Code, Codex.

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-ruleset-execution

README.md
[![agentmods](https://agentmods.dev/badge/skills/paruff/ufawkesai/semgrep/github.svg)](https://agentmods.dev/skills/paruff/ufawkesai/semgrep)
Your own site
<a href="https://agentmods.dev/skills/paruff/ufawkesai/semgrep"><img src="https://agentmods.dev/badge/skills/paruff/ufawkesai/semgrep/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-ruleset-execution

Your own site · 80×15
<a href="https://agentmods.dev/skills/paruff/ufawkesai/semgrep"><img src="https://agentmods.dev/badge/skills/paruff/ufawkesai/semgrep.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 37 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 553 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00037 $0.00553
Opus 5 $0.00018 $0.00277
Sonnet 5 $0.00007 $0.00111
Haiku 4.5 $0.00004 $0.00055

Measured 8d ago against content hash b3fbf76de22f, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

semgrep-ruleset-execution 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 8d 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.

.agents/skills/security-testing/sast/semgrep/SKILL.md · 84 lines

What it actually says

Skill: Semgrep Ruleset Execution

Load trigger: "load semgrep-ruleset-execution skill" > DORA: Cap 1 (AI Policy) Token cost: Low

Purpose

Run Semgrep rulesets against Fawkes codebases.

Responsibilities

  • Execute OWASP rules
  • Execute custom Fawkes rules
  • Validate findings

Inputs

  • Semgrep config

Outputs

  • semgrep.json

Rulesets

Ruleset Purpose
p/owasp-top-ten OWASP Top 10 vulnerabilities
p/typescript TypeScript security patterns
p/python Python security patterns
p/go Go security patterns
p/dockerfile Dockerfile best practices
p/kubernetes K8s manifest security
fawkes/custom Fawkes-specific patterns

Fawkes Custom Rules

Rule ID Pattern Severity
fawkes-no-secrets-in-code Hardcoded API keys, tokens Critical
fawkes-no-plaintext-logs Secrets in log statements High
fawkes-secure-env Env vars with secrets Medium
fawkes-no-exec exec() with user input High

Validation Rules

  • All rulesets executed
  • No critical findings
  • Findings triaged
  • SARIF output valid

Output Format

{
  "skill": "semgrep-ruleset-execution",
  "status": "pass | fail",
  "rulesets_executed": 7,
  "findings": {
    "critical": 0,
    "high": 1,
    "medium": 3,
    "low": 5,
    "info": 2
  },
  "results": []
}

Success Criteria

  • No critical findings
  • All findings documented
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. 8d ago First seen · 84 lines · 37 tokens per session scan A b3fbf76de22f

Subscribe to this mod's changes

semgrep-ruleset-execution is a skill published in the GitHub repository paruff/uFawkesAI (2 stars, last pushed 19d ago), licensed MIT. It adds 37 tokens to every session and 553 once invoked, about $0.0002 per session on Opus 5. 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 2026-09-03.

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