sast

sast is an agent for Claude Code from Rune-kit/rune. It costs 47 tokens per session (244 once invoked), scanned A, original, MIT.

A single interface for running static-analysis tools, which inspect source code for bugs, style problems, and security issues.

In plain words
What is it for?
It detects the project language, runs available tools such as ESLint, Semgrep, Bandit, Clippy, and govulncheck, and reports what ran, what was skipped, and the findings.
Why use it?
It combines results from language-specific tools and reports them with consistent BLOCK, WARN, or INFO severity levels.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: model in frontmatter.

Part of the rune plugin — 57 agents shipped together

Good fit It detects the project language, runs available tools such as ESLint, Semgrep, Bandit, Clippy, and govulncheck, and reports what ran, what was skipped, and the findings.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/rune-kit/rune/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.

Clone the repo
git clone --depth 1 https://github.com/Rune-kit/rune

Made for: Claude Code.

Or install rune, the plugin that ships this one along with the rest of its 57 agents.

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/agents/rune-kit/rune/sast/github.svg)](https://agentmods.dev/agents/rune-kit/rune/sast)
Your own site
<a href="https://agentmods.dev/agents/rune-kit/rune/sast"><img src="https://agentmods.dev/badge/agents/rune-kit/rune/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/agents/rune-kit/rune/sast"><img src="https://agentmods.dev/badge/agents/rune-kit/rune/sast.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 47 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 244 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 $0.00047 $0.00244
Opus 5.5 $0.00019 $0.00098
Sonnet 5.5 $0.00009 $0.00049
Haiku 4.5 $0.00005 $0.00024

Measured 1mo ago against content hash 339375b92021, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, 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 1mo 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/sast.md · 26 lines

What it actually says

You are the sast skill — Rune's static analysis orchestrator.

Quick Reference

Workflow:

  1. Detect language from config (package.json, pyproject.toml, Cargo.toml, go.mod)
  2. Run primary language tool (ESLint, Bandit, Clippy, govulncheck)
  3. Run Semgrep if available (cross-language analysis)
  4. Normalize findings to unified format: BLOCK (must fix) / WARN (should fix) / INFO
  5. Report: tool coverage table + findings by severity

Critical Rules:

  • Run ALL available tools for detected language
  • Show install instructions for missing tools (SKIP with reason, not FAIL)
  • Normalize to unified format — don't dump raw output
  • Report which tools ran and which were skipped

Read skills/sast/SKILL.md for the full specification.

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. 1mo ago First seen · 26 lines · 47 tokens per session scan A 339375b92021

Subscribe to this mod's changes

sast is an agent published in the GitHub repository Rune-kit/rune (86 stars, last pushed 2mo ago), licensed MIT. It adds 47 tokens to every session and 244 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-08-30.

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