CodeMap MCP server

<!-- mcp-name: io.github.bbajt/codemap-mcp -->

CodeMap — Turn Your AI Agent Into a Semantic Dragon

Stop feeding your AI agent raw source files. Give it a semantic index instead.

CodeMap is a Roslyn-powered MCP server that lets AI agents navigate C#, VB.NET, and F# codebases by symbol, call graph, and architectural fact — instead of brute-reading thousands of lines of source code. One tool call. Precise answer. No context flood.

Average token savings: 90%+ versus reading files directly.

Install via Claude Code or manually

The fastest way to install is to paste the prompt below into a Claude Code shell. Claude will check your environment, install the tool, and register it as an MCP server — no manual steps needed.

Check whether .NET 10 SDK is installed by running dotnet --version. If the reported version is below 10.0, install it: on Windows run winget install Microsoft.DotNet.SDK.10, on macOS/Linux download from https://dotnet.microsoft.com/download/dotnet/10.0. Verify with dotnet --version once done. Once .NET 10 is confirmed, install CodeMap: if codemap-mcp is not yet installed run dotnet tool install --global codemap-mcp, otherwise run dotnet tool update --global codemap-mcp to get the latest version. Verify the binary is reachable with codemap-mcp --version. Finally, register it as a global MCP server in Claude Code by running claude mcp add codemap-mcp codemap-mcp --scope user and confirm it appears in the output of claude mcp list.

Or install manually:

# Install .NET 10 SDK if needed (Windows)
winget install Microsoft.DotNet.SDK.10

dotnet tool install --global codemap-mcp
codemap-mcp --version
claude mcp add codemap-mcp codemap-mcp --scope user

Requires .NET 10 (LTS). If you're working on a C# or VB.NET codebase you almost certainly have it already — check with dotnet --version.

Upgrading from v1.x

v2.0.0 uses a new binary storage engine (memory-mapped segments instead of SQLite). Your old .db baselines are not auto-migrated — run index.ensurebaseline once per repo to rebuild. Old baselines are harmless and can be cleaned with index.cleanup. If you need the old engine temporarily, set CODEMAPENGINE=sqlite.

The Problem

An AI agent working on a C# codebase without CodeMap does this:

Agent: I need to find who calls OrderService.SubmitAsync.
→ Read OrderService.cs       (3,600 tokens)
→ Read Controllers/...       (3,600 tokens)
→ Grep across src/           (another 3,600 tokens)
→ Maybe find it. Maybe not.

With CodeMap:

refs.find { symbol_id: "M:MyApp.Services.OrderService.SubmitAsync", kind: "Call" }
→ 220 tokens. Exact file, line, and excerpt for every call site. Done.

That's 93.9% fewer tokens for a task agents do dozens of times per session. On a real production codebase (100k+ lines), savings are 95–99%+.

What It Does

Shortened. The full README is on GitHub.