CLI helps AI agents edit C# by code meaning, not text search
cs4ai is a Roslyn-backed that helps work on C# by using code meaning instead of plain text search. When Claude looks for something like AddCQRS with grep, it can get many noisy matches from comments, strings, project file names, and lookalike names, so the agent reads too much and may choose the wrong place to edit. cs4ai starts a session from a C# solution, does a full build, and returns a .
It can inspect a whole type, return a staleness token, update a method body, rename a symbol across all call sites, and verify the result with a real dotnet build and tests. Edits must include the latest staleness token, so an agent using an old view of the code gets refused and receives the current source needed to recover. s only say whether the command was valid; build and test results are placed in the response body and marked as new or preexisting.
Changes are written directly to disk, and undo is left to git.
Key points
- Plain grep can make an AI agent read many irrelevant C# matches before editing.
- cs4ai uses Roslyn to inspect and change code by symbols, types, and methods.
- A staleness token blocks edits based on an outdated view of the code.
- Build and test output separates new failures from preexisting ones.
- Edits go straight to disk, while undo is handled by git.