sast

sast is a skill for Claude Code, Codex from paruff/uFawkesAI. It costs 40 tokens per session (507 once invoked), scanned A, original, MIT.

A static security check, meaning it examines source code without running the application. It combines Semgrep and CodeQL to find insecure code patterns, vulnerabilities, and configuration mistakes.

In plain words
What is it for?
Use it to scan service source code, validate security hotspots and coding patterns, and produce SARIF and JSON reports.
Why use it?
It helps detect serious security problems during development and can flag issues before code is merged.

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 scan service source code, validate security hotspots and coding patterns, and produce SARIF and JSON reports.

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

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

Your own site · 80×15
<a href="https://agentmods.dev/skills/paruff/ufawkesai/sast"><img src="https://agentmods.dev/badge/skills/paruff/ufawkesai/sast.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 40 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 507 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 $0.00040 $0.00507
Opus 5 $0.00020 $0.00253
Sonnet 5 $0.00008 $0.00101
Haiku 4.5 $0.00004 $0.00051

Measured 8d ago against content hash 485ceee982e5, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

sast 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/SKILL.md · 84 lines

What it actually says

Skill: Static Application Security Testing (SAST)

Load trigger: "load sast skill" > DORA: Cap 1 (AI Policy) + Cap 6 (Operational Visibility) Token cost: Low

Purpose

Detect insecure code patterns, vulnerabilities, and misconfigurations in OBS, PIPE, and Fawkes services.

Responsibilities

  • Run Semgrep rulesets
  • Run CodeQL analysis
  • Validate security hotspots
  • Validate secure coding patterns

Inputs

  • Source code
  • Semgrep config
  • CodeQL database

Outputs

  • sast.sarif
  • sast-report.json

Sub-Skills

Skill Purpose
sast/semgrep Semgrep ruleset execution
sast/codeql CodeQL deep analysis

Severity Levels

Severity Action
Critical Block merge, immediate fix
High Block merge, fix within 24h
Medium Warn, fix within 1 week
Low Log, fix in next sprint
Info Log only

Validation Rules

  • No critical or high vulnerabilities
  • No unsafe patterns in core logic
  • SARIF output valid
  • All findings triaged

Tools

  • Semgrep
  • CodeQL

Output Format

{
  "skill": "sast",
  "status": "pass | fail",
  "semgrep": { "findings": 0, "critical": 0, "high": 0 },
  "codeql": { "findings": 0, "critical": 0, "high": 0 },
  "total_findings": 0,
  "blocked": false
}

Success Criteria

  • No critical or high vulnerabilities
  • No unsafe patterns in core logic
Files

What ships with it

2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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 · 40 tokens per session scan A 485ceee982e5

Subscribe to this mod's changes

sast is a skill published in the GitHub repository paruff/uFawkesAI (2 stars, last pushed 19d ago), licensed MIT. It adds 40 tokens to every session and 507 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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