Set up CI for the a2ui-agent python SDK (google#536)

Author: nan-yu

.github/workflows/python_a2ui_agent_build_and_test.yml

@@ -0,0 +1,51 @@
+# Copyright 2026 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: Build and Test A2UI-agent Python SDK
+
+on:
+  push:
+    branches:
+      - '*'
+    paths:
+      - 'a2a_agents/python/a2ui_agent/**'
+  pull_request:
+    paths:
+      - 'a2a_agents/python/a2ui_agent/**'
+
+jobs:
+  build-and-test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.x'
+
+      - name: Install `uv` globally
+        run: |
+          python -m pip install --upgrade pip
+          pip install uv
+
+      - name: Build the python SDK
+        working-directory: a2a_agents/python/a2ui_agent
+        run: uv build .
+
+      - name: Run unit tests
+        working-directory: a2a_agents/python/a2ui_agent
+        run: uv run --with pytest pytest tests/

a2a_agents/python/a2ui_agent/README.md

@@ -24,6 +24,14 @@ The `src/a2ui/extension` directory contains the core logic for the A2UI agent ex
    uv run --with pytest pytest tests/
    ```
 
+## Building the SDK
+
+To build the SDK, run the following command from the `a2a_agents/python/a2ui_agent` directory:
+
+```bash
+uv build .
+```
+
 ## Disclaimer
 
 Important: The sample code provided is for demonstration purposes and illustrates the mechanics of A2UI and the Agent-to-Agent (A2A) protocol. When building production applications, it is critical to treat any agent operating outside of your direct control as a potentially untrusted entity.