fix: Convert examples for A2A agent card

[timn]

The AgentSkill in an A2A AgentCard expects examples to be a list of queries as strings. Therefore, agent examples, e.g., as provided by an ExampleTool, must be converted.

This change performs that extraction of just the inputs and converting them to a string to add to the AgentSkill.

Testing Plan

Unit Tests:

• I have added or updated unit tests for my change.
• All unit tests pass locally.

Manual End-to-End (E2E) Tests:

Create an agent with ExampleTool and use agent card builder to create agent card for that agent. Fails without this change, succeeds with change included.

Checklist

• I have read the CONTRIBUTING.md document.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.
• I have manually tested my changes end-to-end.
• Any dependent changes have been merged and published in downstream modules.

[gemini-code-assist]

Summary of Changes

Hello @timn, 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 resolves an issue where agent examples, particularly those originating from ExampleTool, were not correctly formatted for A2A AgentCard's AgentSkill component. The change introduces a dedicated function to extract and convert these examples into a list of simple query strings, ensuring proper data ingestion and functionality when building agent cards. This fix is crucial for agents utilizing structured example formats to be correctly represented within the A2A framework.

Highlights

• New Example Extraction Logic: Introduced a new utility function, _extract_inputs_from_examples, responsible for parsing and converting agent examples into the required list of query strings for AgentSkill.
• Agent Card Builder Integration: Integrated the new example extraction function into both _build_llm_agent_skills and _build_non_llm_agent_skills to ensure that AgentSkill objects receive examples in the correct string format, resolving previous compatibility issues.
• Comprehensive Unit Testing: Added new unit tests for _extract_inputs_from_examples to validate its behavior across various input scenarios, including plain text examples, structured examples from ExampleTool, and handling of None inputs.

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[gemini-code-assist]

Code Review

This pull request correctly adapts the agent card examples to be a list of strings by introducing the _extract_inputs_from_examples function. The changes are logical and well-tested. My review includes a suggestion to refactor the new function for better readability and robustness. I've also pointed out some minor issues in the new tests, such as an incorrect docstring, use of is instead of == for value comparison, and an unused variable.

[ryanaiagent]

Hi @timn , Thank you for your contribution! We appreciate you taking the time to submit this pull request. Your PR has been received by the team and is currently under review. We will provide feedback as soon as we have an update to share.

[ryanaiagent]

Hi @wyf7107 , can you please review this. LGTM.