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Title *

Description

Current state: The tools.testing.update_handler is hardcoded to handle 'approve_request' updates with a specific handler function. To handle updates with custom logic (like LLM responses), developers must create new tools.

Problem: Workflow DSL is JSON-based, but ctx.handle_update() requires Python functions. No declarative way to compose update handling with tool execution.

Solution: Create tools.update.handle - a generic update handler that accepts:
- update_name: which update to listen for
- response_tool: which tool to invoke for generating response
- response_kwargs: kwargs to pass to the response tool
- timeout_seconds: how long to wait

Example usage:
builder.task(
    'handle_messages',
    'tools.update.handle',
    kwargs={
        'update_name': 'user_message',
        'response_tool': 'tools.llm.call',
        'response_kwargs': {
            'provider': 'ollama',
            'model': 'deepseek-v3.2:cloud',
            'prompt': '{{update_payload.message}}',
        },
        'timeout_seconds': 300,
    }
)

This removes the need for custom tools per update type and makes the engine properly composable.

Due Date (YYYY-MM-DD)

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Edit Issue #714