fix: missing tool error fields (#27)

tests/test_codex_tool_result_summary.py

@@ -66,3 +66,41 @@ def test_translate_mcp_tool_call_summarizes_legacy_structured_key() -> None:
     assert len(out) == 1
     assert isinstance(out[0], ActionEvent)
     assert out[0].action.detail["result_summary"]["has_structured"] is True
+
+
+def test_translate_mcp_tool_call_missing_error_is_ok() -> None:
+    evt = {
+        "type": "item.completed",
+        "item": {
+            "id": "item_4",
+            "type": "mcp_tool_call",
+            "server": "docs",
+            "tool": "search",
+            "status": "completed",
+            "result": {"content": []},
+        },
+    }
+
+    out = translate_codex_event(evt, title="Codex")
+    assert len(out) == 1
+    assert isinstance(out[0], ActionEvent)
+    assert out[0].ok is True
+
+
+def test_translate_command_execution_allows_missing_exit_code() -> None:
+    evt = {
+        "type": "item.completed",
+        "item": {
+            "id": "item_5",
+            "type": "command_execution",
+            "command": "ls -la",
+            "aggregated_output": "",
+            "status": "completed",
+        },
+    }
+
+    out = translate_codex_event(evt, title="Codex")
+    assert len(out) == 1
+    assert isinstance(out[0], ActionEvent)
+    assert out[0].ok is True
+    assert out[0].action.detail["exit_code"] is None