AIContextBuilder — Claude Code MCP server for C#/.NET
A local MCP server maps C#/.NET code for AI agents. Use it to trace symbols, tests, dependency injection paths, and change impact.
Open on GitHubWhat AIContextBuilder does
AIContextBuilder reads C#/.NET solutions with Roslyn and builds a semantic symbol map. It can trace callers, interface implementations, overrides, dependency-injection construction paths, tests, and code reached by a change. The selected material can be exported as structured Markdown for an AI agent.
The server also assembles task-specific context under a token budget. Named symbols remain central while surrounding detail is reduced when space is tight. The package includes the MCP server, the aicb CLI, and a Windows desktop app for selecting and examining context. It accepts .sln, .slnx, .slnf, C#, and XAML/AXAML.
Optional AI tags in XML documentation add declared meaning such as role, layer, responsibility, stability, and side effects. A reduced package lists what was left out, but it cannot establish that the remaining context is sufficient for a correct solution.
What it helps with
- trace callers of a C# symbol
- locate interface implementations and overrides
- inspect the impact of a code change
- pack task context within a token budget
- connect implementation code with tests and DI paths
Example prompts for the agent
- Use
AIContextBuilderto map the code affected by changingColorMixerService. - Prepare an edit context for this class and include its covering tests and related implementations.
- Trace the selected symbol’s callers and dependencies, then keep the result within a token budget.
How to install AIContextBuilder
Install
The MCP registry has no launch command for it: see the repository README
Step by step, with commands for each platform: How to add an MCP server to Claude Code, Codex, Cursor, VS Code, Gemini CLI and more
Questions about AIContextBuilder
How do I install AIContextBuilder in Claude Code?
Connect AIContextBuilder to Claude Code as a local MCP server.
What does AIContextBuilder do?
It uses Roslyn to map a C#/.NET solution, trace symbol relationships, and assemble focused context for an AI agent.
What happens when the context exceeds the token budget?
The named symbols stay in the package while surrounding detail is trimmed. The result identifies omitted types, tests, or related components.
