diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 915c73b47..0c542bc51 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,6 +1,6 @@
 {
   "packages/toolbox-langchain": "0.6.0",
-  "packages/toolbox-core": "0.6.0",
+  "packages/toolbox-core": "1.0.0",
   "packages/toolbox-llamaindex": "0.6.0",
   "packages/toolbox-adk": "0.7.0"
 }
\ No newline at end of file
diff --git a/packages/toolbox-core/CHANGELOG.md b/packages/toolbox-core/CHANGELOG.md
index 0bd826b43..bdd738ff4 100644
--- a/packages/toolbox-core/CHANGELOG.md
+++ b/packages/toolbox-core/CHANGELOG.md
@@ -1,5 +1,24 @@
 # Changelog
 
+## [1.0.0](https://github.com/googleapis/mcp-toolbox-sdk-python/compare/toolbox-core-v0.6.0...toolbox-core-v1.0.0) (2026-03-25)
+
+
+### Features
+
+* **adk:** Support `ToolContext` for `auth_token_getters` in `toolbox-adk` ([#579](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/579)) ([05e5f2c](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/05e5f2cba0a123c14594508eeee6bd228274b138))
+* **core:** add observability with OpenTelemetry ([#583](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/583)) ([d479385](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/d479385cccf31a7cb1dffcc4634ddb6fe7ef932a))
+
+
+### Bug Fixes
+
+* **core:** resolve dropped default parameter values in MCP transport parsing ([#601](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/601)) ([08c4af4](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/08c4af4217feab19fdf8cb4fb328d1bb5e10a4e3))
+* improve tool docstrings ([#593](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/593)) ([90a2b33](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/90a2b33937f396eb554e222762e7732829f7f1c1))
+
+
+### Documentation
+
+* Documentation migrated to the MCP Toolbox official docsite ([#581](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/581)) ([da12899](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/da1289944d8d401c0d2b958ae47da42da729848e))
+
 ## [0.6.0](https://github.com/googleapis/mcp-toolbox-sdk-python/compare/toolbox-core-v0.5.10...toolbox-core-v0.6.0) (2026-03-03)
 
 
diff --git a/packages/toolbox-core/src/toolbox_core/version.py b/packages/toolbox-core/src/toolbox_core/version.py
index 8f4814f32..756f75ffc 100644
--- a/packages/toolbox-core/src/toolbox_core/version.py
+++ b/packages/toolbox-core/src/toolbox_core/version.py
@@ -12,4 +12,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-__version__ = "0.6.0"
+__version__ = "1.0.0"