diff --git a/actions/setup/js/add_copilot_reviewer.cjs b/actions/setup/js/add_copilot_reviewer.cjs
index 0bbf4e37670..ee10538677f 100644
--- a/actions/setup/js/add_copilot_reviewer.cjs
+++ b/actions/setup/js/add_copilot_reviewer.cjs
@@ -35,8 +35,8 @@ async function main() {
 
   core.info(`Adding Copilot as reviewer to PR #${prNumber}`);
 
+  const { owner, repo } = context.repo;
   try {
-    const { owner, repo } = context.repo;
     await github.rest.pulls.requestReviewers({
       owner,
       repo,
diff --git a/actions/setup/js/add_copilot_reviewer.test.cjs b/actions/setup/js/add_copilot_reviewer.test.cjs
index 9e61365fd24..7caaca68400 100644
--- a/actions/setup/js/add_copilot_reviewer.test.cjs
+++ b/actions/setup/js/add_copilot_reviewer.test.cjs
@@ -155,4 +155,29 @@ describe("add_copilot_reviewer", () => {
       reviewers: ["copilot-pull-request-reviewer[bot]"],
     });
   });
+
+  it("should log initial info message when starting", async () => {
+    process.env.PR_NUMBER = "100";
+
+    await runScript();
+
+    expect(mockCore.info).toHaveBeenCalledWith("Adding Copilot as reviewer to PR #100");
+  });
+
+  it("should truncate float PR_NUMBER to integer", async () => {
+    process.env.PR_NUMBER = "5.9";
+
+    await runScript();
+
+    expect(mockGithub.rest.pulls.requestReviewers).toHaveBeenCalledWith(expect.objectContaining({ pull_number: 5 }));
+  });
+
+  it("should include PR number in failure message on API error", async () => {
+    process.env.PR_NUMBER = "321";
+    mockGithub.rest.pulls.requestReviewers.mockRejectedValueOnce(new Error("Rate limited"));
+
+    await runScript();
+
+    expect(mockCore.setFailed).toHaveBeenCalledWith(expect.stringContaining("321"));
+  });
 });