From 15a196f69ba9571154f42507de01dd61648de3a5 Mon Sep 17 00:00:00 2001
From: "google-labs-jules[bot]"
 <161369871+google-labs-jules[bot]@users.noreply.github.com>
Date: Tue, 27 Jan 2026 03:41:10 +0000
Subject: [PATCH] fix(ci): robustly verify upstream branch in PR review
 workflow

Replaces `git rev-parse` with `git ls-remote` to verify the existence of the upstream base branch before attempting to fetch and diff. This prevents workflow failures when the PR targets a branch that does not exist on the upstream remote (e.g. `unstable` or other feature branches), gracefully skipping the diff step with a warning instead.

Co-authored-by: PR0M3TH3AN <53631862+PR0M3TH3AN@users.noreply.github.com>
---
 .github/workflows/agent-pr-review.yml | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/.github/workflows/agent-pr-review.yml b/.github/workflows/agent-pr-review.yml
index ec3ae661..b010a79b 100644
--- a/.github/workflows/agent-pr-review.yml
+++ b/.github/workflows/agent-pr-review.yml
@@ -36,12 +36,12 @@ jobs:
 
       - name: Verify upstream branch and diff
         run: |
-          if ! git rev-parse --verify upstream/${{ github.base_ref }} >/dev/null 2>&1; then
-            echo "::error::Branch upstream/${{ github.base_ref }} not found."
-            exit 1
+          if git ls-remote --heads upstream "${{ github.base_ref }}" | grep "${{ github.base_ref }}" > /dev/null; then
+            git fetch upstream "${{ github.base_ref }}"
+            git diff --name-only upstream/${{ github.base_ref }}...HEAD
+          else
+            echo "::warning::Branch upstream/${{ github.base_ref }} not found. Skipping diff."
           fi
-          # Verify we can diff against it
-          git diff --name-only upstream/${{ github.base_ref }}...HEAD
 
       - name: Run Agent Review
         env: