What is a rule coordinate in implement-rule?

A rule coordinate is a unique identifier, such as CORE:S:0001, used to locate a specific rule within the registry to implement its structural or content checks.

Why does the skill focus on 'structural signatures'?

Focusing on the structural shape of a violation (like a missing description after a title) makes rules more robust and prevents them from being bypassed by incidental keyword matches.

How do I preview changes before they are saved?

You can use the --dry-run flag with the /implement-rule command to see the generated checks and fixtures without writing them to the filesystem.

What kind of files does it generate fixtures for?

It generates realistic instruction files, such as CLAUDE.md, that simulate real-world project documentation to verify the rule's accuracy.

Does this skill support semantic evaluation?

Yes, it can implement semantic rules that utilize LLM-based judgment, typically preceded by deterministic pre-checks to surface relevant content.

AI Coding Rule Implementer

Name: AI Coding Rule Implementer
Author: reporails

byreporails

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Developer Tools

Automates the creation of validation checks, regex patterns, and test fixtures for AI coding agent instruction rules.

The implement-rule skill is designed to streamline the development of the RepoRails rules engine by transforming rule skeletons into fully functional validation modules. It analyzes rule criteria and examples to automatically generate mechanical checks, deterministic regex patterns, and realistic pass/fail test fixtures. By focusing on the structural signature of violations rather than simple keyword matching, it ensures that AI coding instructions (like CLAUDE.md) remain structured, efficient, and compliant with project governance standards.

Key Features

016 GitHub stars

02Automated regex pattern generation based on structural violation signatures

03Support for mechanical, deterministic, and semantic check types

04Template variable resolution for agent-specific rule implementations

05Creation of realistic 30-80 line test fixtures for pass/fail validation

06Dry-run mode to preview generated rule logic before file modification

Use Cases

01Accelerating the development of rule-based governance for AI agents

02Standardizing AI coding instructions across large engineering organizations

03Building custom validation suites for project-specific Claude instructions

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add reporails/rules implement-rule

For use in Claude.ai and ChatGPT

Download Skill