fix(multi-edit): pass structuredPatch to update UI; harden FileEditToolUpdatedMessage against undefined patches\n\n- MultiEditTool: compute diff via getPatch and render standard update message\n- FileEditToolUpdatedMessage: treat missing structuredPatch as empty to avoid crash\n- Preserves existing feature and UI while eliminating reduce-on-undefined

src/components/FileEditToolUpdatedMessage.tsx

@@ -10,7 +10,7 @@ import { useTerminalSize } from '../hooks/useTerminalSize'
 
 type Props = {
   filePath: string
-  structuredPatch: Hunk[]
+  structuredPatch?: Hunk[]
   verbose: boolean
 }
 
@@ -20,11 +20,12 @@ export function FileEditToolUpdatedMessage({
   verbose,
 }: Props): React.ReactNode {
   const { columns } = useTerminalSize()
-  const numAdditions = structuredPatch.reduce(
+  const patches = Array.isArray(structuredPatch) ? structuredPatch : []
+  const numAdditions = patches.reduce(
     (count, hunk) => count + hunk.lines.filter(_ => _.startsWith('+')).length,
     0,
   )
-  const numRemovals = structuredPatch.reduce(
+  const numRemovals = patches.reduce(
     (count, hunk) => count + hunk.lines.filter(_ => _.startsWith('-')).length,
     0,
   )
@@ -49,18 +50,19 @@ export function FileEditToolUpdatedMessage({
           </>
         ) : null}
       </Text>
-      {intersperse(
-        structuredPatch.map(_ => (
-          <Box flexDirection="column" paddingLeft={5} key={_.newStart}>
-            <StructuredDiff patch={_} dim={false} width={columns - 12} />
-          </Box>
-        )),
-        i => (
-          <Box paddingLeft={5} key={`ellipsis-${i}`}>
-            <Text color={getTheme().secondaryText}>...</Text>
-          </Box>
-        ),
-      )}
+      {patches.length > 0 &&
+        intersperse(
+          patches.map(_ => (
+            <Box flexDirection="column" paddingLeft={5} key={_.newStart}>
+              <StructuredDiff patch={_} dim={false} width={columns - 12} />
+            </Box>
+          )),
+          i => (
+            <Box paddingLeft={5} key={`ellipsis-${i}`}>
+              <Text color={getTheme().secondaryText}>...</Text>
+            </Box>
+          ),
+        )}
     </Box>
   )
 }

src/tools/MultiEditTool/MultiEditTool.tsx

@@ -46,6 +46,7 @@ import { PROJECT_FILE } from '../../constants/product'
 import { DESCRIPTION, PROMPT } from './prompt'
 import { emitReminderEvent } from '../../services/systemReminder'
 import { recordFileEdit } from '../../services/fileFreshness'
+import { getPatch } from '../../utils/diff'
 
 const EditSchema = z.object({
   old_string: z.string().describe('The text to replace'),
@@ -136,7 +137,13 @@ export const MultiEditTool = {
       )
     }
 
-    return <FileEditToolUpdatedMessage {...output} />
+    return (
+      <FileEditToolUpdatedMessage
+        filePath={output.filePath}
+        structuredPatch={output.structuredPatch}
+        verbose={false}
+      />
+    )
   },
   async validateInput(
     { file_path, edits }: z.infer<typeof inputSchema>,
@@ -350,12 +357,20 @@ export const MultiEditTool = {
       const relativePath = relative(workingDir, filePath)
       const summary = `Successfully applied ${edits.length} edits to ${relativePath}`
 
+      const structuredPatch = getPatch({
+        filePath: file_path,
+        fileContents: currentContent,
+        oldStr: currentContent,
+        newStr: modifiedContent,
+      })
+
       const resultData = {
-        filePath: relativePath,
+        filePath: file_path,
         wasNewFile: !fileExists,
         editsApplied: appliedEdits,
         totalEdits: edits.length,
         summary,
+        structuredPatch,
       }
 
       // Log the operation