chore(helloworld): python sample A2A 1.0.x update

[Iwaniukooo11]

Description

Migrates the helloworld python sample to align with the A2A SDK v1.0.x specifications, and updates dependency management from uv to standard pip and requirements.txt.

Changes

1. A2A v1.0.x API Migration

• Modernized SDK Imports: Cleaned up legacy imports by routing them through the public SDK facade (a2a.types) instead of the private autogenerated protobuf module (a2a.types.a2a_pb2). This was applied to:
  • TaskState in agent_executor.py
  • Role, SendMessageRequest, and GetExtendedAgentCardRequest in test_client.py

2. Dependency Management Migration (uv to pip)

• Added requirements.txt: Autogenerated and pinned all runtime dependencies to ensure identical installations.
• **Deleted pyproject.toml
• **Deleted uv.lock
• Updated README.md: Replaced uv instructions with standard python virtual environment setup (python -m venv .venv) and pip installation steps.

Verification

Verified that:

1. The virtual environment sets up cleanly via pip install -r requirements.txt.
2. The server starts up successfully via python __main__.py.
3. The interactive test client runs and connects successfully via python test_client.py.

[gemini-code-assist]

Code Review

This pull request updates the 'helloworld' Python agent sample to use a standard virtual environment and pip setup instead of the uv package manager in the README instructions. It also adds a requirements.txt file, adds pytest to the dependencies in pyproject.toml, and simplifies imports from a2a.types.a2a_pb2 to a2a.types in agent_executor.py and test_client.py. There are no review comments, so I have no feedback to provide.

Important

The consumer version of Gemini Code Assist on GitHub is being sunset. Starting June 18, 2026, new organization installations will be blocked, and all code review activity will officially cease on July 17, 2026.
For more details on the timeline and next steps, please review the Help Documentation.

[sokoliva]

Let's keep this to be consistent with the rest of the samples and a2aproject in which we have uv.lock present. Having uv.lock helps ensure users get a working environment by allowing for consistent and reproducible installations across machines.

[sokoliva]

Let's remove this, and stick to uv.lock. From Astral's Documentation: "In general, we recommend against using both a uv.lock and a requirements.txt file. The uv.lock format is more powerful and includes features that cannot be expressed in requirements.txt. If you find yourself exporting a uv.lock file, consider opening an issue to discuss your use case."

[sokoliva]

Remove (discussed in other comments)

[sokoliva]

Revert (discussed in other comments)

[sokoliva]

We follow the Conventional Commits specification for our commit messages and PR titles. Titles should be prefixed, one of the most popular prefixes are: fix:, feat:, chore:, ci:, docs:, style:, refactor:, perf:, test:.

For this PR title I propose the prefix chore:. Example: #566

[sokoliva]

Helloworld sample was updated quite recently so not many changes are needed. Let's keep the from a2a.types.a2a_pb2 -> from a2a.types change but revert the others.

[msampathkumar]

Discussed with the requester. More changes are in progress.

For time being we will move forward with-out uv. In future, we hope every sample follow simple requirement.txt file and also build a simple CICD system that checks and installs these requirements and uses pytest for automated tests