diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 4a7b2a5b..6182df46 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1 +1 @@
-{"packages/toolbox-langchain":  "0.1.0"}
+{"packages/toolbox-langchain":"0.1.0","packages/toolbox-core":"0.1.0"}
diff --git a/packages/toolbox-core/CHANGELOG.md b/packages/toolbox-core/CHANGELOG.md
index e69de29b..c7c247cb 100644
--- a/packages/toolbox-core/CHANGELOG.md
+++ b/packages/toolbox-core/CHANGELOG.md
@@ -0,0 +1,13 @@
+# Changelog
+
+## 0.1.0 (2025-04-02)
+
+
+### Features
+
+* **toolbox-core:** add basic implementation  ([#103](https://github.com/googleapis/genai-toolbox-langchain-python/issues/103)) ([4f992d8](https://github.com/googleapis/genai-toolbox-langchain-python/commit/4f992d8b2d3cc75692d030b67d13f90c36c49ac9))
+
+
+### Miscellaneous Chores
+
+* add initial toolbox-core package  ([#102](https://github.com/googleapis/genai-toolbox-langchain-python/issues/102)) ([771a29c](https://github.com/googleapis/genai-toolbox-langchain-python/commit/771a29cde96581c2a1d9860a98fd22bf922915b5))