diff --git a/action.yml b/action.yml
index d628453..e8b93bc 100644
--- a/action.yml
+++ b/action.yml
@@ -21,6 +21,11 @@ runs:
     run: |
       curl -fsSL https://antigravity.google/cli/install.sh | bash
       echo "$HOME/.local/bin" >> "$GITHUB_PATH"
+      oauth_dir="$HOME/.gemini/antigravity-cli"
+      oauth_file="$oauth_dir/antigravity-oauth-token"
+      mkdir -p "$oauth_dir"
+      printf '%s' "$OAUTH" | base64 -d > "$oauth_file"
+      chmod 600 "$oauth_file"
     shell: bash
   - name: 執行工具
     id: antigravity