DevBitsLab.Mcp.SourceGraph.Tool 0.6.1

DevBitsLab.Mcp.SourceGraph

A live code source graph MCP server for .NET solutions. Indexes C# via Roslyn into SQLite + FTS5, exposes graph queries to MCP clients (Claude Code, Cursor, Continue, …) over stdio, and keeps itself fresh as files change.

Lets coding agents replace dozens of Grep + Read calls with one structured tool call: "who calls Foo.PublishAsync?", "what's in MyNamespace?", "what would change if I edit this method?".

Install

dotnet tool install -g DevBitsLab.Mcp.SourceGraph.Tool

Make sure ~/.dotnet/tools is on your PATH.

Wire it up

Claude Code (project-scoped, committed)

Drop .mcp.json at the repo root:

{
  "mcpServers": {
    "sourcegraph": {
      "command": "sourcegraph-mcp",
      "args": ["serve", "--solution", "${workspaceFolder}/MySolution.slnx"]
    }
  }
}

Open the directory in Claude Code; approve the server when prompted. Done.

Pin a version per repo (.config/dotnet-tools.json)

dotnet new tool-manifest
dotnet tool install DevBitsLab.Mcp.SourceGraph.Tool
git add .config/dotnet-tools.json

Collaborators run dotnet tool restore once, then .mcp.json invokes dotnet sourcegraph-mcp serve … (no global install needed).

Cursor / Claude Desktop / Continue

Same command + args shape, just in each client's config file (~/.cursor/mcp.json, claude_desktop_config.json, etc.).

Tools

Plus three resource templates (graph://symbol/{id}, graph://file/{path}, graph://namespace/{name}) for hosts that surface MCP resources.

How it stays live

• File watcher (*.cs recursive, ignores obj/ bin/ .git/ .sourcegraph/).
• .git/HEAD watcher — also handles git worktrees (parses gitdir: from the .git file).
• 200ms debounce, batched re-index. Each canonical symbol keeps a stable id across edits so refs from other files stay valid.

A persistent JSONL log of every tool call lives at <solution>/.sourcegraph/usage.jsonl and the in-process usage_stats tool returns counts/latencies on demand — useful for confirming agents actually use the graph instead of falling back to Grep + Read.

License

MIT.