MarcelRoozekrans/roslyn-codelens-mcp

Overview

A Roslyn-based MCP server that provides semantic code intelligence for .NET codebases. It exposes type hierarchies, call sites, dependency injection registrations, and reflection usage through the Model Context Protocol for use with Claude Code.

Best for

Best for
Developers working with .NET codebases who want semantic code understanding via Claude Code

Use cases

• Navigating type hierarchies in large .NET projects
• Finding all call sites of a specific method
• Auditing DI registrations and reflection usage across a solution

How to use

Tools exposed

• go_to_definition
• find_implementations
• get_project_dependencies
• get_type_hierarchy
• find_circular_dependencies
• get_symbol_context
• get_source_generators
• analyze_data_flow
• find_attribute_usages
• get_generated_code
• analyze_control_flow
• find_large_classes
• get_di_registrations
• find_reflection_usage
• get_complexity_metrics
• get_code_actions
• get_file_overview
• get_diagnostics
• get_nuget_dependencies
• get_public_api_surface

Tested with

Claude Code, VS Code

Example client config

{\n  "mcpServers": {\n    "roslyn-codelens": {\n      "type": "stdio",\n      "command": "npx",\n      "args": ["-y", "roslyn-codelens-mcp"]\n    }\n  }\n}

Notes

A Roslyn-based MCP server that provides semantic code intelligence for .NET codebases. It exposes type hierarchies, call sites, dependency injection registrations, and reflection usage through the Model Context Protocol for use with Claude Code.

13 stars on GitHub. Last updated 2026-05-28. Licensed MIT.

Use cases

• Navigating type hierarchies in large .NET projects
• Finding all call sites of a specific method
• Auditing DI registrations and reflection usage across a solution

Pros

• Leverages Roslyn for deep semantic analysis beyond text search
• Integrates with Claude Code for natural language code queries
• Covers specific .NET concerns like DI and reflection

Cons

• Low star count (13) indicates limited community adoption
• Only works with .NET codebases and requires Roslyn
• Depends on Claude Code for the client interaction

Indexed from awesome-mcp-servers-punkpeye and enriched against its public facts.