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agent-framework/python/samples/getting_started/workflows/declarative
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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>
0521f5bed8 · 2026-02-10 23:04:32 +00:00
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Declarative Workflows

Declarative workflows allow you to define multi-agent orchestration patterns in YAML, including:

  • Variable manipulation and state management
  • Control flow (loops, conditionals, branching)
  • Agent invocations
  • Human-in-the-loop patterns

See the main workflows README for the list of available samples.

Prerequisites

pip install agent-framework-declarative

Running Samples

Each sample directory contains:

  • workflow.yaml - The declarative workflow definition
  • main.py - Python code to load and execute the workflow
  • README.md - Sample-specific documentation

To run a sample:

cd <sample_directory>
python main.py

Workflow Structure

A basic workflow YAML file looks like:

name: my-workflow
description: A simple workflow example

actions:
  - kind: SetValue
    path: turn.greeting
    value: Hello, World!

  - kind: SendActivity
    activity:
      text: =turn.greeting

Action Types

Variable Actions

  • SetValue - Set a variable in state
  • SetVariable - Set a variable (.NET style naming)
  • AppendValue - Append to a list
  • ResetVariable - Clear a variable

Control Flow

  • If - Conditional branching
  • Switch - Multi-way branching
  • Foreach - Iterate over collections
  • RepeatUntil - Loop until condition
  • GotoAction - Jump to labeled action

Output

  • SendActivity - Send text/attachments to user
  • EmitEvent - Emit custom events

Agent Invocation

  • InvokeAzureAgent - Call an Azure AI agent
  • InvokePromptAgent - Call a local prompt agent

Human-in-Loop

  • Question - Request user input
  • WaitForInput - Pause for external input