File Organization

• One class per file in workflow/.
• Private modules prefixed with _ (e.g., _base_node.py).
• Public API exported through __init__.py.
• Unit tests must be placed in the same folder hierarchy under tests/unittests/ as the original file in src/.
• If a single source file has multiple test files (e.g. testing different classes or behaviors separately), use the source file name (without leading underscores or extension) as the prefix for the test file names.
  • Example: src/google/adk/tools/environment/_tools.py -> tests/unittests/tools/environment/test_tools_edit_file.py

File Headers

Every source file must have:

1. Apache 2.0 license header.
2. from __future__ import annotations.
3. Standard library imports, then third-party, then relative.