What is refactor-mcp CLAUDE.md?

A repository guide for RefactorMCP, a Model Context Protocol server that provides C# code-refactoring tools using Microsoft's Roslyn code-analysis platform.

It helps with building the .NET project, running all tests or filtered tests, and understanding its console app, refactoring tools, syntax components, and test suite.

It explains the project's architecture, technologies, and commands so developers can change and test the right parts.

How dave-hillier/refactor-mcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to dave-hillier/refactor-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/dave-hillier/refactor-mcp/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/dave-hillier/refactor-mcp

Made for: Claude Code.

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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/dave-hillier/refactor-mcp/claude-md/github.svg)](https://agentmods.dev/instructions/dave-hillier/refactor-mcp/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/dave-hillier/refactor-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/dave-hillier/refactor-mcp/claude-md/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/dave-hillier/refactor-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/dave-hillier/refactor-mcp/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 902 This file is loaded in full into every session.

When invoked 902 The same file — it is already loaded in full.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00902	$0.00902
Opus 5.5	$0.00361	$0.00361
Sonnet 5.5	$0.00180	$0.00180
Haiku 4.5	$0.00090	$0.00090

Measured 1mo ago against content hash e8d1053e1d2d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

refactor-mcp CLAUDE.md 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.

CLAUDE.md · 113 lines

How it starts

The opening of the file, as written. The whole thing — 113 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Project Overview

RefactorMCP is a Model Context Protocol server that exposes Roslyn-based refactoring tools for C#. It provides extensive code transformation capabilities through both CLI and MCP server modes.

Architecture

Core Components

RefactorMCP.ConsoleApp: Main application hosting refactoring tools and MCP server
- Tools/: Individual refactoring tool implementations (40+ tools)
- SyntaxRewriters/: Roslyn syntax tree rewriting components
- SyntaxWalkers/: Code analysis and traversal utilities
- Tools/Moving/: Moving members and types between types, files and namespaces
RefactorMCP.Tests: Comprehensive xUnit test suite
- Each tool has corresponding test coverage
- Tests organized by feature area

Key Technologies

.NET 9.0
Roslyn (Microsoft.CodeAnalysis) for C# code analysis and transformation
xUnit for testing
Model Context Protocol for server functionality

Development Commands

Build

dotnet build

Run Tests

# Run all tests
dotnet test

# Run tests with filter
dotnet test --filter "FullyQualifiedName~RenameSymbol"

# Run a specific test
dotnet test --filter "FullyQualifiedName=RefactorMCP.Tests.Tools.RenameSymbolToolTests.RenameSymbol_Field_RenamesReferences"

Run Application

# Run MCP server
dotnet run --project RefactorMCP.ConsoleApp

# Run with JSON mode
dotnet run --project RefactorMCP.ConsoleApp -- --json <tool-name> '<json-params>'

# Example: Load solution
dotnet run --project RefactorMCP.ConsoleApp -- --json load-solution '{"solutionPath":"./RefactorMCP.sln"}'

Format Code

dotnet format

Working with Refactoring Tools

Tool Naming Convention

Tools use kebab-case names (e.g., extract-method, move-member)
Each tool has a corresponding class in RefactorMCP.ConsoleApp/Tools/

Adding New Tools

Create tool class in RefactorMCP.ConsoleApp/Tools/
Implement the refactoring logic using Roslyn APIs
Add corresponding tests in RefactorMCP.Tests/Tools/ or RefactorMCP.Tests/ToolsNew/
Register the tool in the appropriate location for MCP discovery

Read the full file on GitHub · 113 lines

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.

1mo ago Changed · +1 lines · +101 tokens per session e8d1053e1d2d
2mo ago First seen · 112 lines · 801 tokens per session scan A afa0077e6cdb

Subscribe to this mod's changes

refactor-mcp CLAUDE.md is an instructions file published in the GitHub repository dave-hillier/refactor-mcp (94 stars, last pushed 1mo ago), licensed MPL-2.0. It adds 902 tokens to every session, about $0.0036 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.

refactor-mcp CLAUDE.md next to 6 instructions from other repositories
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refactor-mcp CLAUDE.mddave-hillier/refactor-mcp	Instructions file	94	1mo ago	MPL-2.0	A	902	Claude Code
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vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

refactor-mcp: Instructions file for Claude Code