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Compare scores, permissions, risks, and fit in one decision-focused table.

DimensionRoslyn CodeLens MCP ServerRoslyn-based semantic .NET/C# intelligence for AI agentsGitHub MCP ServerGitHub's official MCP server for managing repos, issues, PRs, and workflows via natural language
FMRS68 / 100 · C76 / 100 · B
Reliability9 / 2013 / 20
Security and permissions14 / 2014 / 20
Maintenance14 / 2018 / 20
Documentation18 / 2017 / 20
Setup experience13 / 2014 / 20
Best for
  • .NET/C# developers using MCP clients like Claude Code or VS Code
  • AI-assisted development workflows needing deep static analysis and safe refactoring
  • Teams maintaining large SDK-style .NET solutions
  • Teams that want an AI assistant to directly operate on GitHub repos and collaboration workflows
  • Users already in the GitHub Copilot ecosystem who want a zero-deployment remote option
Not for
  • Non-.NET/C# codebases
  • Legacy non-SDK-style csproj projects (skipped with a warning)
  • Environments without the .NET 10 SDK (unless using Docker)
  • Scenarios where you don't want the assistant to have write access to repos (enable only read-only toolsets)
  • Environments with strict network isolation for private repos that can't reach the official remote endpoint
Required permissions
  • Reads and analyzes .NET solutions and source files on disk
  • Tools like apply_code_action can write/modify source files (preview mode available)
  • Running Roslyn analyzer DLLs requires explicit trust via trust_solution
  • A personal access token (PAT) or OAuth App token; effective scope depends on the token's own permissions
  • Enabling toolsets like actions/issues/pull_requests grants write access — request tokens on a least-privilege basis
Risks and side effects
  • Analyzer DLLs execute in-process; the trust model restricts them to NuGet global packages, the dotnet SDK dir, or solution bin/obj, but grant trust carefully
  • apply_code_action, rename_symbol, and change_signature modify source files directly; prefer preview mode first
  • The stdio server has read/write access to the loaded codebase
  • Solutions must be NuGet-restored before loading or reference resolution may fail
  • Write toolsets (creating/merging PRs, triggering workflows) can cause accidental changes if the token is overscoped — try a read-only toolset first
  • In hosted mode, credentials travel via the Authorization header — make sure the client-to-api.githubcopilot.com connection is trusted
Supported clientsClaude Code, VS Code, Visual StudioClaude Desktop, Claude Code, VS Code, Cursor, Windsurf, JetBrains IDEs, Zed, Amp
Tools6715