Fuse: Accelerating Agent Workflows in C# Codebases
Realistic_Tap995 · reddit · 2026-07-16
The author has open-sourced Fuse, an MCP/CLI tool tailored for .NET/C# codebases, designed to boost the development efficiency of AI agents like Claude Code.
They highlighted two common pain points:
- Slow discovery phase: Agents require multiple rounds of reading files, grepping, and understanding symbols, project references, and framework wiring.
- Slow edit loops: Modifying code often requires repeated dotnet build cycles, reading errors, fixing, and rebuilding.
Fuse focuses specifically on .NET scenarios rather than acting as a general code graph, offering better comprehension of:
- DI registrations
- MediatR requests
- ASP.NET routing
- Options binding
It provides local, offline indexing and analysis capabilities, supporting:
- Fast symbol and reference lookup
- Returning pruned, task-relevant source code
- Compile-status checks for single-file Cmodifications
- Displaying callers, affected implementations, and test coverage
The author also shared benchmark data: on a NodaTime index containing 14,760 symbols, exact symbol lookup takes a median of 1.8 ms, and task localization takes 15.7 ms.
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