diff --git a/packages/ai/CHANGELOG.md b/packages/ai/CHANGELOG.md
index d87cf2ca..2f5be4b8 100644
--- a/packages/ai/CHANGELOG.md
+++ b/packages/ai/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Breaking Changes
+
+- Removed built-in Google Gemini CLI and Google Antigravity support, including provider registration, model metadata, OAuth, and package exports. Existing callers must switch to another supported provider.
+
 ### Added
 
 - Added Moonshot AI as a built-in OpenAI-compatible provider with model catalog generation and `MOONSHOT_API_KEY` authentication.
diff --git a/packages/coding-agent/CHANGELOG.md b/packages/coding-agent/CHANGELOG.md
index 2a24a735..20e6fbe0 100644
--- a/packages/coding-agent/CHANGELOG.md
+++ b/packages/coding-agent/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Breaking Changes
+
+- Removed built-in Google Gemini CLI and Google Antigravity support. Existing configurations using those providers must switch to another supported provider.
+
 ### New Features
 
 - Moonshot AI provider support with `MOONSHOT_API_KEY`, default model resolution, and `/login` display.