extension.py DOX

Purpose

• Own the extension.py helper module.
• This module discovers and dispatches Python and WebUI extension hooks.
• Keep this file-level DOX profile synchronized with extension.py because this directory is intentionally flat.

Ownership

• extension.py owns the runtime implementation.
• extension.py.dox.md owns durable notes about responsibilities, contracts, side effects, and verification for that implementation.
• Classes:
• _Unset (no explicit base class)
• Extension (no explicit base class)
  • execute(self, **kwargs) -> None | Awaitable[None]
• Top-level functions:
• _log_extension_call(name: str)
• extensible(func): Make a function emit two implicit extension points around its execution.
• async call_extensions_async(extension_point: str, agent: 'Agent|None'=..., **kwargs)
• call_extensions_sync(extension_point: str, agent: 'Agent|None'=..., **kwargs)
• get_webui_extensions(agent: 'Agent | None', extension_point: str, filters: list[str] | None=...)
• _get_extension_classes(extension_point: str, agent: 'Agent|None'=..., **kwargs) -> list[Type[Extension]]
• _get_file_from_module(module_name: str) -> str
• _get_extensions(folder: str)
• register_extensions_watchdogs()
• Notable constants/configuration names: DEFAULT_EXTENSIONS_FOLDER, USER_EXTENSIONS_FOLDER, _EXTENSIONS_CACHE_AREA, _CLASSES_CACHE_AREA, _UNSET, _EXTENSIONS_LOG_COUNTS.

Runtime Contracts

• Helper modules own reusable framework APIs and must preserve public callers unless all callers, tests, and docs are updated together.
• Update this file whenever public functions, classes, persistence behavior, path/security assumptions, side effects, or cross-module contracts change.
• Extension defines execute(...).
• Observed side-effect areas: filesystem reads, WebSocket state, plugin state.
• Imported dependency areas include: abc, functools, helpers, helpers.print_style, inspect, os, typing.

Key Concepts

• Important called helpers/classes observed in the source: _Unset, inspect.iscoroutinefunction, wraps, _log_extension_call, _get_extension_classes, subagents.get_paths, cache.determine_cache_key, cache.add, files.get_abs_path, modules.load_classes_from_folder, watchdog.add_watchdog, os.path.join, _get_agent, _prepare_inputs, _process_result, call_extensions_sync, cls.execute, files.deabsolute_path, _get_file_from_module, module_name.split.
• Keep request/response, tool, or helper semantics documented here at the same time as source changes.

Work Guidance

• Preserve public helper APIs used by core code and plugins unless every caller is updated.
• Keep path, auth, secret, persistence, network, and subprocess behavior explicit and bounded.
• Prefer adding cohesive helper functions here only when behavior is reused across modules.

Verification

• Run targeted tests for changed helper behavior; run security regressions for auth, filesystem, WebSocket, tunnel, upload, or secret-handling helpers.
• Related tests observed by source search:
  • tests/test_a0_connector_prompt_gating.py
  • tests/test_api_chat_lifetime.py
  • tests/test_browser_agent_regressions.py
  • tests/test_error_retry_plugin.py
  • tests/test_extensions_stress.py
  • tests/test_history_compression_wait.py
  • tests/test_model_config_api_keys.py
  • tests/test_oauth_codex.py

Child DOX Index

No child DOX files.