Graphify C# is a free, headless Roslyn/MSBuild indexer that enables LLM agents to perform compiler-accurate code navigation in C# projects. It transforms source code into deterministic, queryable semantic evidence by resolving symbols through Roslyn, providing precise data on callers, references, implementations, inheritance, and overrides—including overloads, generics, and cross-project relationships. Unlike text-based searches, Graphify C# delivers stable identities and directed edges that agents can inspect without inference, eliminating guesswork in tasks like identifying test-only method usage.

The tool requires no IDE, compiled DLLs, or database; it outputs a single JSON file containing nodes, edges, and hyperedges readable by agents or tools like jq. Installation involves a global dotnet tool, indexing via command line with solution or project inputs, and integrating agent skills for automatic refresh and edge traversal. MIT licensed and designed for agents like Codex and Claude Code, Graphify C# bridges the gap between IDE-level semantic navigation and autonomous coding agents by delivering reliable, compiler-resolved evidence for code structure and usage questions.