Python: [BREAKING] Simplify API: ChatAgent -> Agent, ChatMessage -> Message by eavanvalkenburg · Pull Request #3747 · microsoft/agent-framework

eavanvalkenburg · 2026-02-07T06:39:17Z

Summary

This PR simplifies the public API by removing redundant Chat prefix from core types that users interact with most frequently.

Motivation

Why `Agent` instead of `ChatAgent`

While the .NET side of Agent Framework favors globally unique type names (and has a relatively limited number of orchestration packages to contend with), the Python ecosystem is fundamentally different. Python has a large and growing number of agent-focused packages — LangChain/LangGraph, CrewAI, AutoGen, PydanticAI, Smolagents, and others — and virtually all of them use Agent as their primary class name. By staying with ChatAgent, we miss the opportunity for naming parity with the broader ecosystem, making our API feel less natural to Python developers coming from (or evaluating against) other frameworks. Agent is the name Python developers expect.

Why `Message` instead of `ChatMessage`

Renaming to Message better emphasizes the generic, multimodal nature of what can be passed through a message. Messages in Agent Framework are not limited to text chat — they carry structured content including images, function calls, function results, and other content types. The Chat prefix incorrectly implies a text-only chat paradigm and undersells the capability of the type.

Breaking Changes

Before	After
`ChatAgent`	`Agent`
`RawChatAgent`	`RawAgent`
`ChatMessage`	`Message`
`ChatClientProtocol`	`SupportsChatGetResponse`

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

API Examples

Creating an Agent (Before)

from agent_framework import ChatAgent, ChatMessage
from agent_framework.openai import OpenAIChatClient

client = OpenAIChatClient()
agent = ChatAgent(
    chat_client=client,
    name="assistant",
    instructions="You are a helpful assistant."
)

response = await agent.run("Hello!")

Creating an Agent (After)

from agent_framework import Agent, Message
from agent_framework.openai import OpenAIChatClient

client = OpenAIChatClient()
agent = Agent(
    client=client,
    name="assistant",
    instructions="You are a helpful assistant."
)

response = await agent.run("Hello!")

Working with Messages (Before)

from agent_framework import ChatMessage, Content

# Create a message
message = ChatMessage(role="user", contents=[Content.from_text("Hello")])

# Or with text shorthand
message = ChatMessage("user", ["Hello, how are you?"])

# Access message properties
print(message.role)    # "user"
print(message.text)    # "Hello, how are you?"

Working with Messages (After)

from agent_framework import Message, Content

# Create a message
message = Message(role="user", contents=[Content.from_text("Hello")])

# Or with text shorthand
message = Message("user", ["Hello, how are you?"])

# Access message properties
print(message.role)    # "user"
print(message.text)    # "Hello, how are you?"

Multi-turn Conversations (After)

from agent_framework import Agent, Message, AgentThread
from agent_framework.azure import AzureOpenAIChatClient

client = AzureOpenAIChatClient()
agent = Agent(chat_client=client, name="assistant")

# Use threads for conversation history
thread = AgentThread()
response = await agent.run("What is Python?", thread=thread)
response = await agent.run("Give me an example", thread=thread)

Using Tools (After)

from agent_framework import Agent, tool
from agent_framework.openai import OpenAIChatClient

@tool
def get_weather(city: str) -> str:
    """Get current weather for a city."""
    return f"Weather in {city}: Sunny, 72F"

client = OpenAIChatClient()
agent = Agent(
    chat=client,
    name="weather_bot",
    tools=[get_weather]
)

response = await agent.run("What is the weather in Seattle?")

Streaming Responses (After)

from agent_framework import Agent
from agent_framework.openai import OpenAIChatClient

client = OpenAIChatClient()
agent = Agent(chat_client=client, name="assistant")

async for event in agent.run("Tell me a story", stream=True):
    if event.type == "response_update":
        print(event.data.text, end="", flush=True)

Custom Chat Client Protocol (After)

from agent_framework import SupportsChatGetResponse, Message, ChatResponse
from collections.abc import Sequence

class MyCustomClient:
    """Implement the protocol to create custom chat clients."""
    
    additional_properties: dict = {}
    
    def get_response(
        self,
        messages: Sequence[Message],
        *,
        stream: bool = False,
        **kwargs
    ):
        # Your implementation here
        ...

Internal Changes

Renamed Message in _workflows/_runner_context.py to WorkflowMessage to avoid collision with the new Message type

Migration Guide

Find and replace in your codebase:
- ChatAgent → Agent
- RawChatAgent → RawAgent
- ChatMessage → Message
- ChatClientProtocol → SupportsChatGetResponse

Update imports:

# Before
from agent_framework import ChatAgent, ChatMessage

# After
from agent_framework import Agent, Message

moonbox3

LGTM. Can approve once CI/CD is green.

markwallace-microsoft · 2026-02-09T15:37:05Z

Python Test Coverage Report •

File	Stmts	Miss	Cover	Missing
packages/a2a/agent_framework_a2a
_agent.py	169	9	94%	357, 378, 451–452, 493–494, 523–525
packages/ag-ui/agent_framework_ag_ui
_client.py	151	17	88%	85–86, 90–94, 98–102, 265, 295, 464–466
_message_adapters.py	455	95	79%	91, 101–102, 111–114, 117–121, 123–128, 131, 140–146, 149, 153–155, 164–166, 186, 192–194, 224, 237–238, 248–249, 286, 289, 291, 294, 297, 313, 330, 352, 383, 388, 399–400, 451, 467–468, 534–537, 539, 545, 553–554, 556, 560–563, 576, 665–668, 670, 736, 771–773, 775–778, 781–782, 784, 790, 793, 795, 798, 800, 806–807, 809
_run.py	482	121	74%	157–164, 307, 326–327, 342–343, 358, 386–388, 413, 416–419, 421–422, 425–431, 434–436, 439, 455–457, 464, 470–472, 476, 481–483, 485–486, 502–506, 517, 530, 532–533, 549, 570–571, 626–628, 640–642, 840, 851–852, 859, 877–879, 913–915, 932, 938, 946, 948, 984–990, 993–996, 998–1007, 1010, 1018–1021, 1028, 1031–1032, 1037, 1043–1045, 1049, 1054–1057, 1071–1073
packages/ag-ui/agent_framework_ag_ui/_orchestration
_helpers.py	108	0	100%
_tooling.py	58	0	100%
packages/anthropic/agent_framework_anthropic
_chat_client.py	364	150	58%	373, 405, 407, 422, 444–447, 456, 458, 495–499, 501, 503–504, 506, 511–512, 514, 547–548, 557, 559–560, 565, 582–583, 625, 640, 644–645, 661, 670, 672, 676–677, 720–722, 724, 737–738, 745–747, 751–753, 757–760, 771, 773, 795, 805, 827–833, 840–841, 849–850, 858–861, 868–869, 875–876, 882–883, 889, 897–899, 903, 910–911, 917–918, 924–925, 931, 939–942, 949–950, 969, 976–977, 996, 1018, 1020, 1029–1030, 1036, 1058–1059, 1065–1066, 1075–1085, 1092–1098, 1105–1111, 1118–1127, 1134–1137
packages/azure-ai/agent_framework_azure_ai
_agent_provider.py	117	3	97%	122–123, 251
_chat_client.py	486	75	84%	386, 391–392, 394–395, 398, 401, 403, 408, 669–670, 672, 675, 678, 681–686, 689, 691, 699, 711–713, 717, 720–721, 729–732, 742, 750–753, 755–756, 758–759, 766, 774–775, 783–784, 789–790, 794–801, 806, 809, 817, 823, 831–833, 836, 858–859, 992, 1020, 1035, 1154, 1180, 1189, 1198, 1331
_client.py	196	13	93%	362, 364, 413, 442–447, 490, 525, 527, 603
_project_provider.py	116	6	94%	134–135, 213, 311, 355, 388
packages/chatkit/agent_framework_chatkit
_converter.py	134	46	65%	117, 122, 170, 172, 340, 393, 395, 414–416, 418, 436, 438, 440, 443, 455, 465, 483, 503–527, 529–531
packages/copilotstudio/agent_framework_copilotstudio
_agent.py	84	5	94%	156–157, 192, 200, 317
packages/core/agent_framework
_agents.py	320	35	89%	475, 883, 920, 1019–1021, 1134, 1175, 1177, 1186–1191, 1197, 1199, 1209–1210, 1217, 1219–1220, 1228–1232, 1240–1241, 1243, 1248, 1250, 1284, 1324, 1344
_clients.py	53	3	94%	296, 497, 499
_mcp.py	389	53	86%	113, 175, 184, 247, 255, 276, 366, 433, 468, 470, 474–475, 477–478, 532, 547, 565, 606, 712, 725–730, 752, 773, 776–778, 793–794, 800–802, 821, 830, 833–835, 850–851, 855–859, 876–880, 1020
_memory.py	27	1	96%	154
_middleware.py	329	16	95%	80, 83, 88, 797, 799, 801, 922, 949, 951, 976, 1057, 1061, 1185, 1189, 1250, 1324
_serialization.py	106	4	96%	518, 534, 544, 612
_sessions.py	150	6	96%	197–200, 505, 519
_threads.py	137	3	97%	345, 476–477
_tools.py	797	85	89%	232, 278, 329, 331, 359, 529, 564–565, 676, 678, 698, 716, 730, 742, 747, 749, 756, 789, 860–862, 903, 925–953, 988, 996, 1237, 1489, 1546, 1550, 1629–1633, 1651, 1653–1654, 1766, 1770, 1820, 1822, 1838, 1840, 1904, 1931, 1988, 2056, 2235–2236, 2263, 2271, 2284, 2294–2295, 2330, 2386, 2418
_types.py	1045	96	90%	83, 92–93, 147, 152, 171, 173, 177, 181, 183, 185, 187, 205, 209, 235, 257, 262, 267, 271, 297, 301, 647–648, 1019, 1081, 1098, 1116, 1121, 1139, 1149, 1166–1167, 1169, 1187–1188, 1190, 1197–1198, 1200, 1235, 1246–1247, 1249, 1287, 1544, 1597, 1604, 1626, 1632, 1680, 1723–1728, 1750, 1755, 1921, 1933, 2176, 2185, 2206, 2301, 2526, 2733, 2803, 2815, 2822, 2833, 3037–3039, 3042–3044, 3048, 3053, 3057, 3169–3171, 3199, 3253, 3257–3259, 3261, 3272–3273, 3276–3280, 3286
observability.py	611	84	86%	334, 336–338, 341–343, 348–349, 355–356, 362–363, 370, 372–374, 377–379, 384–385, 391–392, 398–399, 406, 662, 665, 673–674, 677–680, 682, 685–687, 690–691, 719, 721, 732–734, 736–739, 743, 751, 852, 854, 1003, 1005, 1009–1014, 1016, 1019–1023, 1025, 1137–1138, 1140, 1197–1198, 1333, 1387–1388, 1504–1506, 1565, 1735, 1889, 1891
packages/core/agent_framework/_workflows
_agent.py	346	65	81%	59, 67–73, 107–108, 350–351, 357–358, 364, 366, 371, 454–455, 464, 471, 497, 530–532, 534, 536, 538, 543, 548, 595, 625, 642, 681–684, 690, 696, 700–701, 704–710, 714–715, 721, 782, 789, 795–796, 807, 839, 846, 867, 876, 880, 882–884, 891
_agent_executor.py	167	22	86%	98, 146, 164–165, 219–220, 222–223, 255–257, 265–267, 277–279, 281, 285, 289, 293–294
_conversation_history.py	11	11	0%	9, 11, 14, 16–20, 23, 25–26
_conversation_state.py	36	5	86%	40, 45, 47, 49, 64
_edge_runner.py	162	13	91%	53, 58, 71, 138–139, 143, 150, 206, 211, 355–356, 360, 401
_executor.py	176	12	93%	210, 334, 336, 345, 365, 368, 475, 480, 490, 649, 730–731
_message_utils.py	18	3	83%	22, 33, 37
_runner.py	218	32	85%	132–133, 176–179, 183, 224–226, 251–252, 254, 289–291, 315–319, 323, 358, 362, 364, 370, 378–381, 394, 430
_runner_context.py	172	7	95%	86, 89, 385, 405, 482, 495, 499
_typing_utils.py	146	33	77%	153, 177, 219–223, 304, 306–307, 316, 318, 325, 327, 347, 349, 351, 356–363, 366–367, 369–373, 375
_workflow.py	268	26	90%	87, 265–267, 269–270, 288, 292, 320, 422, 597, 618, 644, 671, 673–674, 679–680, 686, 692, 697, 717–719, 732, 809
_workflow_context.py	157	9	94%	57–58, 66, 70, 84, 160, 185, 296, 415
_workflow_executor.py	182	30	83%	94, 444, 468, 470, 478–479, 484, 486, 491, 493, 546, 574–580, 584–586, 594, 599, 610, 620, 624, 630, 634, 644, 648
packages/core/agent_framework/openai
_assistant_provider.py	111	11	90%	158–159, 171, 296, 362, 477–482
_assistants_client.py	276	35	87%	360, 362, 364, 367, 371–372, 375, 378, 383–384, 386, 389–391, 396, 407, 432, 434, 436, 438, 440, 445, 448, 451, 455, 466, 551, 636, 673, 710–713, 765, 782
_chat_client.py	268	21	92%	181–182, 186, 300, 307, 388–395, 397–400, 410, 495, 532, 548
_responses_client.py	604	77	87%	298–301, 305–306, 309–310, 316–317, 322, 335–341, 362, 370, 393, 455, 487, 512, 518, 536–537, 559, 564, 621, 635, 652, 665, 720, 799, 804, 808–810, 814–815, 838, 907, 929–930, 945–946, 964–965, 1096–1097, 1113, 1115, 1194–1202, 1297, 1352, 1367, 1403–1404, 1406–1408, 1422–1424, 1434–1435, 1441, 1456
packages/mem0/agent_framework_mem0
_context_provider.py	75	1	98%	128
_provider.py	86	6	93%	69–70, 92, 174–175, 178
packages/orchestrations/agent_framework_orchestrations
_base_group_chat_orchestrator.py	166	12	92%	109, 277, 292, 326–328, 332, 351, 412, 458–460
_concurrent.py	155	27	82%	51, 60–61, 69–70, 87–88, 93, 120, 125, 130–131, 137, 159, 169, 176, 243, 259, 262, 319, 349, 351–352, 354, 359, 372, 376
_group_chat.py	285	62	78%	173, 336, 343, 372, 383–384, 390, 395, 411, 438–443, 445, 478–481, 483, 488–492, 580, 583, 622, 625, 628, 631, 639, 651–652, 654–655, 657–658, 660, 665, 668, 677, 683, 727–728, 732–733, 747–748, 750–751, 782–783, 849, 868, 876, 881–883, 890, 900
_handoff.py	326	56	82%	104–105, 107, 136–137, 159–169, 171, 173, 175, 180, 278, 332, 357, 385, 393–394, 408, 459–460, 492, 532–534, 539–541, 657, 660, 667, 672, 734, 739, 746, 756, 758, 777, 779, 861–862, 894–895, 977, 984, 1056–1057, 1059
_magentic.py	585	96	83%	63–72, 77, 81–92, 257, 268, 272, 292, 353, 362, 364, 406, 423, 432–433, 435–437, 439, 450, 592, 594, 634, 682, 718–720, 722, 730–733, 737–740, 801–804, 895, 901, 907, 949, 987, 1019, 1036, 1047, 1102–1103, 1107–1109, 1133, 1157–1158, 1171, 1187, 1209, 1257–1258, 1296–1297, 1460, 1463, 1472, 1475, 1480, 1531–1532, 1573–1574, 1622, 1652, 1710, 1724, 1735
_orchestration_request_info.py	54	0	100%
_orchestration_state.py	29	5	82%	22, 30, 70, 87–88
_orchestrator_helpers.py	21	2	90%	90–91
_sequential.py	86	11	87%	73, 166, 177, 183, 214, 216–217, 219, 224, 237, 241
packages/purview/agent_framework_purview
_middleware.py	112	0	100%
_processor.py	167	10	94%	173, 250–253, 258, 286, 288, 294, 296
packages/redis/agent_framework_redis
_chat_message_store.py	149	14	90%	199, 232, 322–323, 326, 329, 485, 575–579, 588, 592
_context_provider.py	178	56	68%	227, 245, 248, 254–255, 257–258, 260–262, 264–266, 268–270, 272–283, 285–286, 288–294, 322, 324, 328–333, 354, 365, 375–376, 389–390, 414, 416–417, 421–422
_history_provider.py	58	1	98%	181
_provider.py	189	9	95%	257, 259, 267, 272–273, 276, 331, 388, 400
TOTAL	16901	2109	87%

Python Unit Test Overview

Tests	Skipped	Failures	Errors	Time
4015	225 💤	0 ❌	0 🔥	1m 6s ⏱️

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dmytrostruk

Based on PR description, I had a comment about chat parameter in this example:

agent = Agent(
    chat=client,
    name="assistant",
    instructions="You are a helpful assistant."
)

But I wasn't able to find it in code changes. Other than that, LGTM.

eavanvalkenburg · 2026-02-10T19:13:48Z

Based on PR description, I had a comment about chat parameter in this example:
agent = Agent(
    chat=client,
    name="assistant",
    instructions="You are a helpful assistant."
)
But I wasn't able to find it in code changes. Other than that, LGTM.

That should be client instead. I'll doublecheck

…entProtocol -> 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.

…ge→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)

- 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

…laration-only tool tests

markwallace-microsoft added documentation Usage: [Issues, PRs], Target: documentation in the code base and learn docs python Usage: [Issues, PRs], Target: Python lab labels Feb 7, 2026

github-actions Bot changed the title ~~[BREAKING] Simplify API: ChatAgent -> Agent, ChatMessage -> Message~~ Python: [BREAKING] Simplify API: ChatAgent -> Agent, ChatMessage -> Message Feb 7, 2026

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Python: types: Handle non-text response types in AgentResponse.messages #3598

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eavanvalkenburg added 14 commits February 10, 2026 23:31

[BREAKING] Rename Agent chat_client parameter to client

84e4d1b

Fix rebase issues: WorkflowMessage references and broken markdown links

44ff311

Fix formatting and lint issues from code quality checks

7665782

Fix import ordering in workflow sample files

bdf58e1

fixed rebase

5247d89

fix: update Agent constructor calls from chat_client to client in dec…

277402d

…laration-only tool tests

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

cae5c67

fixed tests and updated new pieces

ecc35ed

fix agui typevar

16e2a79

fix merge errors

d7c7ec7

fix merge conflicts

58c4f9b

eavanvalkenburg force-pushed the edvan/rename-chat-agent-message branch from 132b0a4 to 58c4f9b Compare February 10, 2026 22:37

fiux merge

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eavanvalkenburg enabled auto-merge February 10, 2026 22:47

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Remove unused links

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Merged via the queue into microsoft:main with commit 0521f5b Feb 10, 2026
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doctorcolossus mentioned this pull request May 7, 2026

Python: [Bug]: can't import ChatMessageStore in 1.2.2 #5700

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eavanvalkenburg deleted the edvan/rename-chat-agent-message branch June 30, 2026 09:01

sumesh-ramasamy mentioned this pull request Jul 5, 2026

Python: docs: fix removed ChatAgent references in _clients.py docstrings #6924

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Python: [BREAKING] Simplify API: ChatAgent -> Agent, ChatMessage -> Message - #3747

Python: [BREAKING] Simplify API: ChatAgent -> Agent, ChatMessage -> Message#3747
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Summary

Motivation

Why Agent instead of ChatAgent

Why Message instead of ChatMessage

Breaking Changes

API Examples

Creating an Agent (Before)

Creating an Agent (After)

Working with Messages (Before)

Working with Messages (After)

Multi-turn Conversations (After)

Using Tools (After)

Streaming Responses (After)

Custom Chat Client Protocol (After)

Internal Changes

Migration Guide

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eavanvalkenburg commented Feb 7, 2026 •

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Why `Agent` instead of `ChatAgent`

Why `Message` instead of `ChatMessage`

markwallace-microsoft commented Feb 9, 2026 •

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