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agent-framework/python/.github/skills/python-development/SKILL.md
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Eduard van Valkenburg 0521f5bed8 Python: [BREAKING] Simplify API: ChatAgent -> Agent, ChatMessage -> Message (#3747)
* [BREAKING] Rename ChatAgent -> Agent, ChatMessage -> Message, ChatClientProtocol -> SupportsChatGetResponse

Simplify the public API by removing redundant 'Chat' prefix from core types:
- ChatAgent -> Agent
- RawChatAgent -> RawAgent
- ChatMessage -> Message
- ChatClientProtocol -> SupportsChatGetResponse

Also renamed internal WorkflowMessage (was Message in _runner_context) to avoid collision.

No backward compatibility aliases - this is a clean breaking change.

* [BREAKING] Rename Agent chat_client parameter to client

* Fix rebase issues: WorkflowMessage references and broken markdown links

* Fix formatting and lint issues from code quality checks

* Fix import ordering in workflow sample files

* fixed rebase

* Fix test failures: use WorkflowMessage and A2AMessage after ChatMessage→Message rename

- Replace Message(data=..., source_id=...) with WorkflowMessage(...) in workflow tests
- Fix isinstance check in A2A agent to use A2AMessage instead of Message
- Fix import in test_workflow_observability.py (Message→WorkflowMessage)

* Fix lint, fmt, and sample errors after ChatMessage→Message rename

- Auto-fix 70+ ruff lint issues across samples (ChatMessage→Message refs)
- Fix HostedVectorStoreContent→Content.from_hosted_vector_store in file search sample
- Fix _normalize_messages→normalize_messages in custom agent sample
- Fix context.terminate→raise MiddlewareTermination in middleware samples
- Fix with_update_hook→with_transform_hook in override middleware sample
- Add TOptions_co import back to custom_chat_client sample
- Add noqa for FastAPI File() default in chatkit sample
- Fix B023 loop variable capture in weather agent sample

* fix: update Agent constructor calls from chat_client to client in declaration-only tool tests

* fix: add register_cleanup to devui lazy-loading proxy and type stub

* fixed tests and updated new pieces

* fix agui typevar

* fix merge errors

* fix merge conflicts

* fiux merge

* Remove unused links

---------

Co-authored-by: Evan Mattson <evan.mattson@microsoft.com>
2026-02-10 23:04:32 +00:00

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---
name: python-development
description: >
Coding standards, conventions, and patterns for developing Python code in the
Agent Framework repository. Use this when writing or modifying Python source
files in the python/ directory.
---
# Python Development Standards
## File Header
Every `.py` file must start with:
```python
# Copyright (c) Microsoft. All rights reserved.
```
## Type Annotations
- Always specify return types and parameter types
- Use `Type | None` instead of `Optional[Type]`
- Use `from __future__ import annotations` to enable postponed evaluation
- Use suffix `T` for TypeVar names: `ChatResponseT = TypeVar("ChatResponseT", bound=ChatResponse)`
- Use `Mapping` instead of `MutableMapping` for read-only input parameters
- Prefer `# type: ignore[...]` over unnecessary casts, or `isinstance` checks, when these are internally called and executed methods
But make sure the ignore is specific for both mypy and pyright so that we don't miss other mistakes
## Function Parameters
- Positional parameters: up to 3 fully expected parameters
- Use keyword-only arguments (after `*`) for optional parameters
- Provide string-based overrides to avoid requiring extra imports:
```python
def create_agent(name: str, tool_mode: Literal['auto', 'required', 'none'] | ChatToolMode) -> Agent:
if isinstance(tool_mode, str):
tool_mode = ChatToolMode(tool_mode)
```
- Avoid shadowing built-ins (use `next_handler` instead of `next`)
- Avoid `**kwargs` unless needed for subclass extensibility; prefer named parameters
## Docstrings
Use Google-style docstrings for all public APIs:
```python
def equal(arg1: str, arg2: str) -> bool:
"""Compares two strings and returns True if they are the same.
Args:
arg1: The first string to compare.
arg2: The second string to compare.
Returns:
True if the strings are the same, False otherwise.
Raises:
ValueError: If one of the strings is empty.
"""
```
- Always document Agent Framework specific exceptions
- Explicitly use `Keyword Args` when applicable
- Only document standard Python exceptions when the condition is non-obvious
## Import Structure
```python
# Core
from agent_framework import ChatAgent, Message, tool
# Components
from agent_framework.observability import enable_instrumentation
# Connectors (lazy-loaded)
from agent_framework.openai import OpenAIChatClient
from agent_framework.azure import AzureOpenAIChatClient
```
## Public API and Exports
Define `__all__` in each module. Avoid `from module import *` in `__init__.py` files:
```python
__all__ = ["ChatAgent", "Message", "ChatResponse"]
from ._agents import ChatAgent
from ._types import Message, ChatResponse
```
## Performance Guidelines
- Cache expensive computations (e.g., JSON schema generation)
- Prefer `match/case` on `.type` attribute over `isinstance()` in hot paths
- Avoid redundant serialization — compute once, reuse
## Style
- Line length: 120 characters
- Format only files you changed, not the entire codebase
- Prefer attributes over inheritance when parameters are mostly the same
- Async by default — assume everything is asynchronous
## Naming Conventions for Connectors
- `_prepare_<object>_for_<purpose>` for methods that prepare data for external services
- `_parse_<object>_from_<source>` for methods that process data from external services