Graphify-CSharp is a free, open-source tool designed to enhance coding agents with compiler-accurate semantic data for C# projects. Built on Roslyn and MSBuild, it indexes source code to produce deterministic, queryable graphs representing callers, references, implementations, inheritance, and overrides across projects and overloads. Unlike simple text searches, Graphify-CSharp leverages compiler binding to provide precise semantic relationships, enabling agents to answer complex questions such as which methods are used exclusively by test projects or which classes implement a given interface.
The tool operates headlessly without requiring an IDE, compiled DLLs, or a database. It outputs a comprehensive JSON document containing nodes and edges that represent semantic connections in the codebase. This output can be consumed directly by AI agents, queried with tools like jq, or integrated into custom workflows. Graphify-CSharp supports various project formats including .sln, .csproj, and SDK-style C# applications.
Graphify-CSharp is positioned as a semantic navigation layer similar to features found in JetBrains Rider and ReSharper but designed for AI coding agents such as Codex and Claude Code. It complements tools like NDepend by focusing narrowly on semantic evidence rather than broad architecture or code quality metrics.
Users can install Graphify-CSharp as a .NET global tool and integrate it into AI agent workflows via provided skills that teach agents how to refresh indexes and interpret semantic edges. The tool also supports incremental indexing with a watcher mode that keeps project data up to date.
While Graphify-CSharp provides rich static analysis, it explicitly notes limitations where runtime behaviors such as reflection or dynamic invocation may create relationships not visible in the static graph. Consequently, zero inbound references indicate no observed static usage but do not guarantee runtime unreachability.
This tool offers developers and AI researchers a new way to empower coding assistants with deep, compiler-verified insights into C# codebases, potentially improving code navigation, refactoring, and automated reasoning tasks.