get_edit_preview
Preview code changes before applying them to verify edits in Python files using semantic analysis.
Instructions
Preview changes a code action would make.
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| file_path | Yes | ||
| line | Yes | ||
| column | Yes | ||
| action_index | Yes |
Output Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| result | Yes |
Implementation Reference
- src/mcp_ty/server.py:728-782 (handler)The get_edit_preview tool handler that retrieves code actions and previews their edits.
async def get_edit_preview( file_path: str, line: int, column: int, action_index: int ) -> str: """Preview changes a code action would make.""" client = _get_client() path = Path(file_path).resolve() if not path.exists(): return _error(f"File not found: {file_path}") try: await client.open_document(path) import asyncio await asyncio.sleep(0.3) diagnostics = client.get_diagnostics(path) relevant_diags = [ d for d in diagnostics if d.range.start.line <= line - 1 <= d.range.end.line ] actions = await client.get_code_actions( path, line - 1, column - 1, line - 1, column, relevant_diags ) if not actions: return _not_found(f"No actions at {path.name}:{line}:{column}") if action_index < 1 or action_index > len(actions): return _error(f"Invalid index. Choose 1-{len(actions)}") action = actions[action_index - 1] if not action.edit: return _error(f"Action '{action.title}' has no edits") all_edits = action.edit.get_all_edits() total_edits = sum(len(e) for e in all_edits.values()) preview = [] for uri, edits in all_edits.items(): edit_path = _uri_to_path(uri) for e in edits: text_preview = e.new_text[:80].replace("\n", "\\n") if e.new_text else "(delete)" preview.append({ "file": edit_path.name, "line": e.range.start.line + 1, "column": e.range.start.character + 1, "new_text": text_preview }) return _ok({ "action": action.title, "edits_count": total_edits,