chore(main): release toolbox-langchain 0.5.9 (#529)

* chore(main): release toolbox-langchain 0.5.9

* Update CHANGELOG.md

---------

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>
Co-authored-by: Anubhav Dhawan <anubhavdhawan@google.com>

Author: release-please[bot]

.release-please-manifest.json

@@ -1,5 +1,5 @@
 {
-  "packages/toolbox-langchain": "0.5.8",
+  "packages/toolbox-langchain": "0.5.9",
   "packages/toolbox-core": "0.5.9",
   "packages/toolbox-llamaindex": "0.5.8",
   "packages/toolbox-adk": "0.6.0"

packages/toolbox-langchain/CHANGELOG.md

@@ -1,5 +1,14 @@
 # Changelog
 
+## [0.5.9](https://github.com/googleapis/mcp-toolbox-sdk-python/compare/toolbox-langchain-v0.5.8...toolbox-langchain-v0.5.9) (2026-02-16)
+
+
+### Features
+
+* Deprecate Protocol.TOOLBOX (Native HTTP Protocol) ([#547](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/547)) ([b99ec50](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/b99ec503bb5d85e6bdf84f72343d90ac00ab8d88))
+* Enable package-specific client identification for MCP ([#525](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/525)) ([7ac0d3f](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/7ac0d3f167af1e47c26a3f43bdb48f3fc0a92109))
+
+
 ## [0.5.8](https://github.com/googleapis/mcp-toolbox-sdk-python/compare/toolbox-langchain-v0.5.7...toolbox-langchain-v0.5.8) (2026-01-28)
 
 

packages/toolbox-langchain/src/toolbox_langchain/version.py

@@ -12,4 +12,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-__version__ = "0.5.8"
+__version__ = "0.5.9"