Rules MCP Server

Rules MCP Server

An MCP server that allows coding agents to look up contextual rules and patterns on demand, providing just-in-time guidance for specific tasks like writing tests or authoring UI.

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Tools

get_rules_for_writing_tests

When writing tests, ALWAYS ask this tool for rules on how to write the test first. Then, use the rules to write the test.

README

My Rules

An MCP server for all my rules, prompts, etc etc. Allows agents to call rules on demand.

There's no point filling 4 paragraphs of instructions for how to write tests if your current session isn't going to write a test.

Spiritually similar to Cursor's rules.

Usage

Claude Code

claude mcp add --transport http rules https://mcp.cianfrani.dev/mcp

Cursor

Install MCP Server

Claude Desktop

{
    "rules": {
      "command": "npx",
      "args": [
        "mcp-remote",
        "https://mcp.cianfrani.dev/mcp"
      ]
    }
}

What's It Do?

Allows coding agents to lookup rules on demand within the context of their current task.

> write a test for @calc.py
  ⎿  Read calc.py (26 lines)

⏺ rules:get_rules_for_writing_tests (MCP)(language: "python")
  ⎿  - Before testing a protected method, ask "Can this logic be adequately tested through the public interface?". If yes, don't test the protected method directly.
     If no, continue testing the protected method.
     - Remember to write tests using the Arrange, Act, Assert pattern.
     … +12 lines (ctrl+r to expand)

⏺ Write(test_calc.py)

Why?

  • It's really annoying trying to carry all these little notes between projects/IDEs.
  • I don't want to have to manually invoke rules.

How's It Work?

Clearly-defined tool descriptions allow the agent to fetch rules on demand, only if they appear to be relevant.

What Doesn't work?

  • Patterns must be associated with a specific action. For example, "writing tests", "authoring UI", "reviewing a PR".
  • The agent ultimately decides if it's going to call the tool. Sometimes it does. Sometimes it doesn't.

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