fix: handling settings extension in the CLI properly

[tomkis]

Summary

Introduces proper handling of settings extension in the CLI

Linked Issues

Fixes #1524

Documentation

• No Docs Needed:

No docs needed - the CLI reference is unchanged.

[gemini-code-assist]

Summary of Changes

Hello @tomkis, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the CLI's agent execution capabilities by implementing a robust mechanism for handling agent settings extensions. It enables users to interactively configure agent-specific parameters before an agent run, ensuring that agents can be tailored to specific operational needs directly from the command line. The changes integrate new UI components for collecting settings input and ensure these configurations are correctly passed to the agent's execution context.

Highlights

• New UI Settings Handling: Introduced a new asynchronous function, _ask_settings_questions, which interactively prompts the user for agent settings directly within the CLI using inquirer. This function supports various field types, including checkbox groups and single-select options.
• Integration of Settings into Agent Execution: The _run_agent function has been updated to accept an optional AgentRunSettings parameter. These settings are then properly serialized and included in the agent's platform_extension_spec when messages are sent, allowing agents to be configured with user-defined parameters.
• Comprehensive Interaction Mode Support: The logic for detecting, rendering, and applying agent settings has been integrated across all interaction modes (MULTI_TURN, SINGLE_TURN, and default execution paths) within the run_agent function, ensuring consistent behavior regardless of how the agent is invoked.
• Dependency Updates: New imports from agentstack_sdk.a2a.extensions.ui.settings have been added to support the new settings functionality, including types like AgentRunSettings, SettingsExtensionSpec, and various field value types.

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[gemini-code-assist]

Code Review

This pull request introduces handling for the settings extension in the CLI. The changes are mostly in apps/agentstack-cli/src/agentstack_cli/commands/agent.py. My review focuses on improving code structure and maintainability. I've pointed out some duplicated code that should be refactored, suggested making some logic more explicit for future-proofing, and recommended cleaning up imports. Overall, the changes look good and address the intended feature.