diff --git a/src/actions-util.test.ts b/src/actions-util.test.ts
index d8e7aa412..f613a4ed7 100644
--- a/src/actions-util.test.ts
+++ b/src/actions-util.test.ts
@@ -5,6 +5,9 @@ import {
   fixCodeQualityCategory,
   getPullRequestBranches,
   isAnalyzingPullRequest,
+  isCCR,
+  isDefaultSetup,
+  isDynamicWorkflow,
 } from "./actions-util";
 import { computeAutomationID } from "./api-client";
 import { EnvVar } from "./environment";
@@ -246,3 +249,25 @@ test("fixCodeQualityCategory", (t) => {
     },
   );
 });
+
+test("isDynamicWorkflow() returns true if event name is `dynamic`", (t) => {
+  process.env.GITHUB_EVENT_NAME = "dynamic";
+  t.assert(isDynamicWorkflow());
+  process.env.GITHUB_EVENT_NAME = "push";
+  t.false(isDynamicWorkflow());
+});
+
+test("isCCR() returns true when expected", (t) => {
+  process.env.GITHUB_EVENT_NAME = "dynamic";
+  process.env.CODEQL_ACTION_ANALYSIS_KEY =
+    "dynamic/copilot-pull-request-reviewer";
+  t.assert(isCCR());
+  t.false(isDefaultSetup());
+});
+
+test("isDefaultSetup() returns true when expected", (t) => {
+  process.env.GITHUB_EVENT_NAME = "dynamic";
+  process.env.CODEQL_ACTION_ANALYSIS_KEY = "dynamic/github-code-scanning";
+  t.assert(isDefaultSetup());
+  t.false(isCCR());
+});
diff --git a/src/actions-util.ts b/src/actions-util.ts
index a2d691b42..2251bedd1 100644
--- a/src/actions-util.ts
+++ b/src/actions-util.ts
@@ -254,7 +254,18 @@ export function isDynamicWorkflow(): boolean {
 
 /** Determines whether we are running in default setup. */
 export function isDefaultSetup(): boolean {
-  return isDynamicWorkflow();
+  return isDynamicWorkflow() && !isCCR();
+}
+
+/** Determines whether we are running in CCR. */
+export function isCCR(): boolean {
+  return (
+    (isDynamicWorkflow() &&
+      process.env["CODEQL_ACTION_ANALYSIS_KEY"]?.startsWith(
+        "dynamic/copilot-pull-request-reviewer",
+      )) ||
+    false
+  );
 }
 
 export function prettyPrintInvocation(cmd: string, args: string[]): string {