ReSharper MCP Server

An MCP (Model Context Protocol) server that runs inside the ReSharper/Rider backend process, exposing code intelligence features to AI assistants via HTTP.

Supports C#, F#, VB, and any language with a ReSharper PSI implementation.

Tools

| Tool | Description | |------|-------------| | find_usages | Find all references to a symbol | | get_symbol_info | Detailed symbol info: kind, type, params, docs, base types, members | | find_implementations | Find implementations of interfaces/abstract classes and overrides | | get_file_errors | Get compile errors and unresolved references | | search_symbol | Search symbols by name (substring match) across the solution | | go_to_definition | Navigate to a symbol's declaration with source text | | get_solution_structure | List projects, target frameworks, and project references | | browse_namespace | Browse namespace hierarchy: child namespaces and types | | list_symbols_in_file | List all declarations in a file | | list_solutions | List all open solutions across Rider instances | | fix_usings | Fix missing using directives in C# files | | format_file | Format, clean up, or apply code style to a file |

Symbol resolution

Tools that operate on a symbol accept two modes:

• By position — filePath + line + column (1-based)
• By name — symbolName (e.g. "MyClass", "Namespace.MyClass", "MyClass.MyMethod")

An optional kind filter ("type", "method", "property", "field", "event") helps disambiguate. When multiple symbols match, tools return an ambiguity error listing all candidates with their qualified names, kinds, and locations.

Installation

From JetBrains Marketplace

Install the plugin from Rider: Settings → Plugins → Marketplace → search for "MCP Server for Code Intelligence".

From source

./install-rider.sh
# Restart Rider

The script builds the plugin and copies it to your local Rider plugin directory.

MCP client configuration

Add to your MCP client config (e.g. Claude Code settings.json):

{
  "mcpServers": {
    "resharper": {
      "type": "http",
      "url": "http://127.0.0.1:23741/"
    }
  }
}

The server starts automatically when you open a solution in Rider.

Set RESHARPER_MCP_PORT environment variable to override the default port.

Building

# Build the .NET backend
dotnet build src/ReSharperMcp/ReSharperMcp.csproj -c Release

# Build a distributable plugin ZIP
./build-plugin.sh

Architecture

• Runs as a ReSharper SolutionComponent (activated when a solution opens, stopped when it closes)
• Hosts an HTTP server on 127.0.0.1:23741 implementing MCP over JSON-RPC 2.0
• Uses ReSharper's PSI (Program Structure Interface) APIs for code analysis
• Two-part Rider plugin: minimal JVM JAR (plugin descriptor) + .NET backend DLL
• Targets net472 (required by the ReSharper host process)