riff nit

src/goose/toolkit/developer.py

@@ -19,6 +19,7 @@
 # Global dictionary to store the last read timestamps
 last_read_timestamps: Dict[str, float] = {}
 
+
 def keep_unsafe_command_prompt(command: str) -> PromptType:
     command_text = Text(command, style="bold red")
     message = (

tests/toolkit/test_developer.py

@@ -93,3 +93,21 @@ def test_write_file(temp_dir, developer_toolkit):
     content = "Hello World"
     developer_toolkit.write_file(test_file.as_posix(), content)
     assert test_file.read_text() == content
+
+
+def test_write_file_prevent_write_if_changed(temp_dir, developer_toolkit):
+    test_file = temp_dir / "test.txt"
+    content = "Hello World"
+    updated_content = "Hello Universe"
+
+    # Initial write to record the timestamp
+    developer_toolkit.write_file(test_file.as_posix(), content)
+    developer_toolkit.read_file(test_file.as_posix())
+
+    # Modify file externally to simulate change
+    test_file.write_text(updated_content)
+
+    # Try to write through toolkit and check response
+    result = developer_toolkit.write_file(test_file.as_posix(), content)
+    assert result.endswith("has been modified since it was last read. Not writing to file.")
+    assert test_file.read_text() == updated_content