chore: merge release v1.28.1 to main (#5122)

Co-authored-by: Jacksunwei <1281348+Jacksunwei@users.noreply.github.com>
Co-authored-by: Liang Wu <wuliang@google.com>
Co-authored-by: Sasha Sobran <asobran@google.com>
Co-authored-by: Ankur Sharma <ankusharma@google.com>

Author: 4 people

.github/.release-please-manifest.json

@@ -1,3 +1,3 @@
 {
-  ".": "1.28.0"
+  ".": "1.28.1"
 }

CHANGELOG.md

@@ -1,5 +1,18 @@
 # Changelog
 
+## [1.28.1](https://github.com/google/adk-python/compare/v1.28.0...v1.28.1) (2026-04-02)
+
+
+### Features
+
+* **live:** support live for `gemini-3.1-flash-live-preview` model ([ee69661](https://github.com/google/adk-python/commit/ee69661a616056fa89e0ec2188aaa59bd714d8c9))
+
+
+### Bug Fixes
+
+* Disallow args on /builder and Add warning about Web UI usage to CLI help ([f037f68](https://github.com/google/adk-python/commit/f037f68d67ae1bd16b00df0c7523fb67cbd1e911))
+* **live:** Buffer tool calls and emit them together upon turn completion ([081adbd](https://github.com/google/adk-python/commit/081adbdfa41490e4868b028a1cdabceb811a7505))
+
 ## [1.28.0](https://github.com/google/adk-python/compare/v1.27.5...v1.28.0) (2026-03-26)
 
 

src/google/adk/version.py

@@ -13,4 +13,4 @@
 # limitations under the License.
 
 # version: major.minor.patch
-__version__ = "1.28.0"
+__version__ = "1.28.1"