rules-installer

rules-installer is a skill for Claude Code, Codex from SummerSec/SumSec-Skills. It costs 34 tokens per session (443 once invoked), scanned A, original, Apache-2.0.

A project skill that installs semantic guidance into AGENTS.md or CLAUDE.md and creates the full semantic-rules.md file.

In plain words
What is it for?
Use it to set up semantic rules in a project, update existing instruction files, and verify the generated files.
Why use it?
It gives the coding agent a project-local reference for writing and reviewing instruction files, while checking that installation succeeded.

Skill for Claude CodeCodex

Part of the semantic-linter plugin — 4 skills, 3 commands shipped together

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.

agentmods
npx agentmods add skills/summersec/sumsec-skills/rules-installer
Any agent
npx skills add SummerSec/SumSec-Skills --skill rules-installer
Clone the repo
git clone --depth 1 https://github.com/SummerSec/SumSec-Skills

Made for: Claude Code, Codex.

Or install semantic-linter, the plugin that ships this one along with the rest of its 4 skills, 3 commands.

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 rules-installer

README.md
[![agentmods](https://agentmods.dev/badge/skills/summersec/sumsec-skills/rules-installer.svg)](https://agentmods.dev/skills/summersec/sumsec-skills/rules-installer)
Your own site
<a href="https://agentmods.dev/skills/summersec/sumsec-skills/rules-installer"><img src="https://agentmods.dev/badge/skills/summersec/sumsec-skills/rules-installer.svg" alt="Measured on agentmods" height="20"></a>
Per session 34 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 443 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00034 $0.00443
Opus 5 $0.00017 $0.00221
Sonnet 5 $0.00007 $0.00089
Haiku 4.5 $0.00003 $0.00044

Measured yesterday against content hash 13964fefd39b, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

rules-installer 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 yesterday.

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.

semantic-linter/skills/rules-installer/SKILL.md · 57 lines

What it actually says

Rules Installer

Install Semantic-Linter into the user's current project by generating two artifacts:

  • semantic-rules.md: the full semantic guidance file
  • a managed block in AGENTS.md and or CLAUDE.md: the lightweight always-present pointer

What This Skill Must Do

  1. Detect the current project directory with pwd.
  2. Locate scripts/build-rules.js from the active plugin or local source checkout.
  3. Run:
node "<SCRIPT>" --existing "$(pwd)"
  1. Run:
node "<SCRIPT>" --check --existing "$(pwd)"
  1. Tell the user:
    • which files were written
    • whether validation passed
    • that the default mode is guarded
    • that project-local semantic-rules.md is preferred over the plugin fallback

Important Rules

  • Never hand-write semantic-rules.md.
  • Never hand-write the managed <!-- STL:RULES:BEGIN --> block.
  • If both AGENTS.md and CLAUDE.md already exist, update both.
  • If neither file exists, let build-rules.js create the host-appropriate default target.

Runtime Model

Semantic-Linter is no longer pointer-only.

  • Claude can use SessionStart, SubagentStart, UserPromptSubmit, PreToolUse, and PostToolUse.
  • Codex relies on the managed project instruction file and on-demand rule loading.
  • pointer mode keeps only the lightweight pointer.
  • guarded mode adds write-time lint checks.
  • strict mode also enables prompt scanning.

When To Suggest Follow-up Commands

  • /stl-rules after policy or lexicon changes
  • /stl-lexicon when the user wants to add or refine trap pairs
  • npm run scan -- <file> when the user wants an explicit one-off scan
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. yesterday First seen · 57 lines · 34 tokens per session scan A 13964fefd39b

Subscribe to this mod's changes

rules-installer is a skill published in the GitHub repository SummerSec/SumSec-Skills (8 stars, last pushed 20d ago), licensed Apache-2.0. It adds 34 tokens to every session and 443 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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