feat: add a2a agent card generation with the CLI

[guillaumeblaquiere]

This PR introduces a new CLI command, generate_agent_card, to the ADK. This command simplifies the setup for A2A (Agent-to-Agent) communication by automating the generation of Agent Cards. It scans the project directory for available agents and produces the necessary JSON configuration for each one.

Key Features

• Automatic Discovery: Detects all agents in the current working directory using AgentLoader
• Configurable RPC URL: Supports customization of the protocol, host, and port used in the agent's endpoint URL.
• JSON Output: Outputs the generated Agent Cards to standard output (stdout) in JSON format, making it easy to pipe to other tools.
• File Generation: Includes a --create-file flag to automatically save the generated configuration as agent.json within each agent's directory.
• Graceful Fallback: Handles the optional a2a dependency, providing a clear error message if the package is not installed.

Usage Examples

Print Agent Cards to console:

adk generate_agent_card

Generate agent.json files for all agents with a custom host and port:

adk generate_agent_card --host 0.0.0.0 --port 8080 --create-file

[gemini-code-assist[bot]]

Summary of Changes

Hello @guillaumeblaquiere, I'm Gemini Code Assist[^1]! 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 enhances the ADK (Agent Development Kit) by adding a new command-line interface tool, generate_agent_card. This tool automates the process of creating Agent Cards, which are crucial for Agent-to-Agent (A2A) communication. It streamlines development by discovering agents within a project, generating their necessary JSON configurations, and offering options to either print these configurations to the console or save them as files, significantly reducing manual setup and improving the developer experience for A2A integration.

Highlights

• New CLI Command: Introduced generate_agent_card to the ADK CLI, streamlining the setup for Agent-to-Agent (A2A) communication.
• Automated Agent Card Generation: The new command automates the creation of Agent Cards by scanning the project directory for available agents and generating their necessary JSON configurations.
• Configurable RPC URL: Users can customize the protocol, host, and port for the agent's endpoint URL when generating Agent Cards.
• Flexible Output Options: Generated Agent Cards can be outputted to standard output (stdout) in JSON format or automatically saved as agent.json files within each agent's directory using the --create-file flag.
• Graceful Dependency Handling: The command gracefully handles the optional a2a dependency, providing a clear error message if the package is not installed.

Using Gemini Code Assist

The full guide for Gemini Code Assist can be found on our documentation page, here are some quick tips.

Invoking Gemini

You can request assistance from Gemini at any point by creating a comment using either /gemini <command> or @gemini-code-assist <command>. Below is a summary of the supported commands on the current page.

Feature	Command	Description
Code Review	/gemini review	Performs a code review for the current pull request in its current state.
Pull Request Summary	/gemini summary	Provides a summary of the current pull request in its current state.
Comment	@gemini-code-assist	Responds in comments when explicitly tagged, both in pull request comments and review comments.
Help	/gemini help	Displays a list of available commands.

Customization

To customize Gemini Code Assist for GitHub experience, repository maintainers can create a configuration file and/or provide a custom code review style guide (such as PEP-8 for Python) by creating and adding files to a .gemini/ folder in the base of the repository. Detailed instructions can be found here.

Limitations & Feedback

Gemini Code Assist may make mistakes. Please leave feedback on any instances where its feedback is incorrect or counter productive. You can react with :thumbsup: and :thumbsdown: on @gemini-code-assist comments. If you're interested in giving your feedback about your experience with Gemini Code Assist for Github and other Google products, sign up here.

You can also get AI-powered code generation, chat, as well as code reviews directly in the IDE at no cost with the Gemini Code Assist IDE Extension.

[^1]: Review the Privacy Notices, Generative AI Prohibited Use Policy, Terms of Service, and learn how to configure Gemini Code Assist in GitHub here. Gemini can make mistakes, so double check it and use code with caution.

[adk-bot]

Response from ADK Triaging Agent

Hello @guillaumeblaquiere, thank you for creating this PR!

To help us review this PR more effectively, could you please provide the following:

• Associated Issue: This PR introduces a new feature. Could you please associate a GitHub issue with it? If one doesn't exist, please create one.
• Testing Plan: Please add a "Testing Plan" section to your PR description, detailing how you've tested these changes.
• Logs or Screenshots: Could you please provide logs or screenshots demonstrating the new CLI command in action?

This information will help reviewers to review your PR more efficiently. You can find more details in our contribution guidelines. Thanks!

[ryanaiagent]

Hi @guillaumeblaquiere , Thank you for your contribution through this pull request! Can you please fix the failing tests.