diff --git a/.github/workflows/claude-assistant.yml b/.github/workflows/claude-assistant.yml
index b1052a3..20499bc 100644
--- a/.github/workflows/claude-assistant.yml
+++ b/.github/workflows/claude-assistant.yml
@@ -36,6 +36,7 @@ jobs:
       contents: read
       pull-requests: read
       issues: read
+      id-token: write # required by claude-code-action for internal authentication
     steps:
       - name: Checkout repository
         uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4