Fix #4113: Move relPath & newContent checks in writeToFileTool earlie… (#4378)

Fix #4113: Move relPath & newContent checks in writeToFileTool earlier and run after they exist or block is non-partial
Add tests covering the issue.

src/core/tools/__tests__/writeToFileTool.test.ts

@@ -399,4 +399,33 @@ describe("writeToFileTool", () => {
 			expect(mockCline.diffViewProvider.reset).toHaveBeenCalled()
 		})
 	})
+
+	describe("parameter validation", () => {
+		it("errors and resets on missing path parameter", async () => {
+			await executeWriteFileTool({ path: undefined })
+
+			expect(mockCline.consecutiveMistakeCount).toBe(1)
+			expect(mockCline.recordToolError).toHaveBeenCalledWith("write_to_file")
+			expect(mockCline.sayAndCreateMissingParamError).toHaveBeenCalledWith("write_to_file", "path")
+			expect(mockCline.diffViewProvider.reset).toHaveBeenCalled()
+		})
+
+		it("errors and resets on empty path parameter", async () => {
+			await executeWriteFileTool({ path: "" })
+
+			expect(mockCline.consecutiveMistakeCount).toBe(1)
+			expect(mockCline.recordToolError).toHaveBeenCalledWith("write_to_file")
+			expect(mockCline.sayAndCreateMissingParamError).toHaveBeenCalledWith("write_to_file", "path")
+			expect(mockCline.diffViewProvider.reset).toHaveBeenCalled()
+		})
+
+		it("errors and resets on missing content parameter", async () => {
+			await executeWriteFileTool({ content: undefined })
+
+			expect(mockCline.consecutiveMistakeCount).toBe(1)
+			expect(mockCline.recordToolError).toHaveBeenCalledWith("write_to_file")
+			expect(mockCline.sayAndCreateMissingParamError).toHaveBeenCalledWith("write_to_file", "content")
+			expect(mockCline.diffViewProvider.reset).toHaveBeenCalled()
+		})
+	})
 })

src/core/tools/writeToFileTool.ts

@@ -26,12 +26,28 @@ export async function writeToFileTool(
 	let newContent: string | undefined = block.params.content
 	let predictedLineCount: number | undefined = parseInt(block.params.line_count ?? "0")
 
-	if (!relPath || newContent === undefined) {
+	if (block.partial && (!relPath || newContent === undefined)) {
 		// checking for newContent ensure relPath is complete
 		// wait so we can determine if it's a new file or editing an existing file
 		return
 	}
 
+	if (!relPath) {
+		cline.consecutiveMistakeCount++
+		cline.recordToolError("write_to_file")
+		pushToolResult(await cline.sayAndCreateMissingParamError("write_to_file", "path"))
+		await cline.diffViewProvider.reset()
+		return
+	}
+
+	if (newContent === undefined) {
+		cline.consecutiveMistakeCount++
+		cline.recordToolError("write_to_file")
+		pushToolResult(await cline.sayAndCreateMissingParamError("write_to_file", "content"))
+		await cline.diffViewProvider.reset()
+		return
+	}
+
 	const accessAllowed = cline.rooIgnoreController?.validateAccess(relPath)
 
 	if (!accessAllowed) {
@@ -96,22 +112,6 @@ export async function writeToFileTool(
 
 			return
 		} else {
-			if (!relPath) {
-				cline.consecutiveMistakeCount++
-				cline.recordToolError("write_to_file")
-				pushToolResult(await cline.sayAndCreateMissingParamError("write_to_file", "path"))
-				await cline.diffViewProvider.reset()
-				return
-			}
-
-			if (newContent === undefined) {
-				cline.consecutiveMistakeCount++
-				cline.recordToolError("write_to_file")
-				pushToolResult(await cline.sayAndCreateMissingParamError("write_to_file", "content"))
-				await cline.diffViewProvider.reset()
-				return
-			}
-
 			if (predictedLineCount === undefined) {
 				cline.consecutiveMistakeCount++
 				cline.recordToolError("write_to_file")