fix(logs): detect additional error payload fields

src/features/member-log-stream/core/domain/policies/__tests__/memberLogPreviewExtractor.test.ts

@@ -425,6 +425,39 @@ Reply to this comment using MCP tool task_add_comment.
     expect(result.items[0]?.preview).not.toContain('{"type"');
   });
 
+  it('marks structured isError payloads as errors and prefers stderr details', () => {
+    const result = extractMemberLogPreviewItems({
+      provider: 'opencode_runtime',
+      maxItems: 3,
+      textLimit: 160,
+      messages: [
+        message({
+          uuid: 'stderr-result',
+          type: 'user',
+          role: 'user',
+          timestamp: '2026-04-01T10:01:00.000Z',
+          content: [
+            {
+              type: 'tool_result',
+              tool_use_id: 'tool-stderr',
+              content: {
+                isError: true,
+                stderr: 'Permission denied while writing app/index.tsx',
+              },
+            },
+          ],
+        }),
+      ],
+    });
+
+    expect(result.items[0]).toMatchObject({
+      kind: 'tool_result',
+      title: 'Tool error',
+      preview: 'Permission denied while writing app/index.tsx',
+      tone: 'error',
+    });
+  });
+
   it('formats orphan comment result payloads without guessing add vs read semantics', () => {
     const result = extractMemberLogPreviewItems({
       provider: 'claude_transcript',

src/features/member-log-stream/core/domain/policies/memberLogPreviewExtractor.ts

@@ -297,7 +297,12 @@ function unknownPayloadLooksLikeError(value: unknown): boolean {
   if (type === 'error' || type?.endsWith('_error')) {
     return true;
   }
-  if (record.ok === false || record.success === false) {
+  if (
+    record.ok === false ||
+    record.success === false ||
+    record.isError === true ||
+    record.is_error === true
+  ) {
     return true;
   }
 
@@ -325,6 +330,7 @@ function payloadErrorMessage(payload: Record<string, unknown>): string | null {
   const direct =
     stringField(payload, 'error') ??
     stringField(payload, 'errorMessage') ??
+    stringField(payload, 'stderr') ??
     stringField(payload, 'message');
   if (direct) {
     return direct;