Unity C# Edit

Implement Unity C# changes with unity-cli as the primary write path. Prefer the smallest write primitive that keeps the change correct, and preserve Unity serialization, UI binding paths, and editor/runtime boundaries.

Use When

• The user intends to change C# behavior in .cs files.
• The user wants to create or rewrite scripts (single or coordinated multi-file).
• The user asks for a symbol rename, member add/remove, or refactor.
• The user changes project or package settings as part of a code change.

Do Not Use When

• The task is read-only investigation; use unity-csharp-navigate.
• The work targets Editor state inspection (console, profiler, packages); use unity-editor-tools.

Preferred Flow

1. Decide the write shape: symbol edit, full-file write, multi-file write, or settings change.
2. Read only the minimum context with read, get_symbols, find_symbol, or find_refs.
3. Preview risky symbol edits with apply: false.
4. Apply with refresh, waitForCompile, and updateIndex when later steps depend on clean diagnostics.
5. Inspect changedFiles, changedSymbols, and diagnostics; fix compilation issues before unrelated follow-up.

unity-cli raw get_symbols --json '{"path":"Assets/Scripts/Player.cs"}'
unity-cli raw rename_symbol --json '{"relative":"Assets/Scripts/Player.cs","namePath":"Player/Jump","newName":"Leap","apply":false}'
unity-cli raw apply_csharp_edits --json '{"files":[{"relative":"Assets/Scripts/IPlayerMover.cs","newText":"public interface IPlayerMover { void Move(); }\n"}],"validate":true,"apply":true,"waitForCompile":true,"updateIndex":true}'
unity-cli raw get_compilation_state --json '{}'

Examples

• "Implement dash cooldown in PlayerController.cs and update the related tests."
• "Rename Jump to Leap across the player package without breaking serialized field names."
• "Create a new editor utility script and change the matching project setting."
• "Refactor an interface, its implementation, and the tests in one coordinated write."

References

• runtime-checklist.md: connection and instance prerequisites.
• file-write-recipes.md: choosing between symbol edits, file writes, and multi-file writes.
• lsp-write-safety.md: preview-first edits, namePath, and write-result checks.
• unity-implementation-guidelines.md: serialized fields, UI bindings, editor code, ScriptableObjects, SettingsProviders.
• settings-write-recipes.md: project and package settings safe-write recipes.