Method handlePartial

src/core/tools/WriteToFileTool.ts:196–257

(task: Task, block: ToolUse<"write_to_file">)

	}

	override async handlePartial(task: Task, block: ToolUse<"write_to_file">): Promise<void> {
		const relPath: string | undefined = block.params.path
		const newContent: string | undefined = block.params.content

		// Wait for path to stabilize before showing UI (prevents truncated paths)
		if (!this.hasPathStabilized(relPath) || newContent === undefined) {
			return
		}

		const provider = task.providerRef.deref()
		const state = await provider?.getState()
		const isPreventFocusDisruptionEnabled = experiments.isEnabled(
			state?.experiments ?? {},
			EXPERIMENT_IDS.PREVENT_FOCUS_DISRUPTION,
		)

		if (isPreventFocusDisruptionEnabled) {
			return
		}

		// relPath is guaranteed non-null after hasPathStabilized
		let fileExists: boolean
		const absolutePath = path.resolve(task.cwd, relPath!)

		if (task.diffViewProvider.editType !== undefined) {
			fileExists = task.diffViewProvider.editType === "modify"
		} else {
			fileExists = await fileExistsAtPath(absolutePath)
			task.diffViewProvider.editType = fileExists ? "modify" : "create"
		}

		// Create parent directories early for new files to prevent ENOENT errors
		// in subsequent operations (e.g., diffViewProvider.open)
		if (!fileExists) {
			await createDirectoriesForFile(absolutePath)
		}

		const isWriteProtected = task.rooProtectedController?.isWriteProtected(relPath!) || false
		const isOutsideWorkspace = isPathOutsideWorkspace(absolutePath)

		const sharedMessageProps: ClineSayTool = {
			tool: fileExists ? "editedExistingFile" : "newFileCreated",
			path: getReadablePath(task.cwd, relPath!),
			content: newContent || "",
			isOutsideWorkspace,
			isProtected: isWriteProtected,
		}

		const partialMessage = JSON.stringify(sharedMessageProps)
		await task.ask("tool", partialMessage, block.partial).catch(() => {})

		if (newContent) {
			if (!task.diffViewProvider.isEditing) {
				await task.diffViewProvider.open(relPath!)
			}

			await task.diffViewProvider.update(
				everyLineHasLineNumbers(newContent) ? stripLineNumbers(newContent) : newContent,