diff --git a/actions/setup/js/resolve_host_repo.cjs b/actions/setup/js/resolve_host_repo.cjs
index e6c94a0cf0..d460f6ad8e 100644
--- a/actions/setup/js/resolve_host_repo.cjs
+++ b/actions/setup/js/resolve_host_repo.cjs
@@ -69,7 +69,13 @@ async function main() {
     core.info(`Same-repo invocation: checking out ${targetRepo} @ ${targetRef}`);
   }
 
+  // Compute the repository name (without owner prefix) for use cases that require
+  // only the repo name, such as actions/create-github-app-token which expects
+  // `repositories` to contain repo names only when `owner` is also provided.
+  const targetRepoName = targetRepo.split("/").at(-1);
+
   core.setOutput("target_repo", targetRepo);
+  core.setOutput("target_repo_name", targetRepoName);
   core.setOutput("target_ref", targetRef);
 }
 
diff --git a/actions/setup/js/resolve_host_repo.test.cjs b/actions/setup/js/resolve_host_repo.test.cjs
index 5b203caf05..a4a0afb1b9 100644
--- a/actions/setup/js/resolve_host_repo.test.cjs
+++ b/actions/setup/js/resolve_host_repo.test.cjs
@@ -199,6 +199,33 @@ describe("resolve_host_repo.cjs", () => {
     expect(mockCore.setOutput).toHaveBeenCalledWith("target_ref", "abc123def456");
   });
 
+  it("should output target_repo_name when invoked cross-repo", async () => {
+    process.env.GITHUB_WORKFLOW_REF = "my-org/platform-repo/.github/workflows/gateway.lock.yml@refs/heads/main";
+    process.env.GITHUB_REPOSITORY = "my-org/app-repo";
+
+    await main();
+
+    expect(mockCore.setOutput).toHaveBeenCalledWith("target_repo_name", "platform-repo");
+  });
+
+  it("should output target_repo_name when same-repo invocation", async () => {
+    process.env.GITHUB_WORKFLOW_REF = "my-org/platform-repo/.github/workflows/gateway.lock.yml@refs/heads/main";
+    process.env.GITHUB_REPOSITORY = "my-org/platform-repo";
+
+    await main();
+
+    expect(mockCore.setOutput).toHaveBeenCalledWith("target_repo_name", "platform-repo");
+  });
+
+  it("should output target_repo_name without owner prefix when falling back to GITHUB_REPOSITORY", async () => {
+    process.env.GITHUB_WORKFLOW_REF = "";
+    process.env.GITHUB_REPOSITORY = "my-org/fallback-repo";
+
+    await main();
+
+    expect(mockCore.setOutput).toHaveBeenCalledWith("target_repo_name", "fallback-repo");
+  });
+
   it("should include target_ref in step summary for cross-repo invocations", async () => {
     process.env.GITHUB_WORKFLOW_REF = "my-org/platform-repo/.github/workflows/gateway.lock.yml@refs/heads/feature-branch";
     process.env.GITHUB_REPOSITORY = "my-org/app-repo";
diff --git a/actions/setup/js/tsconfig.json b/actions/setup/js/tsconfig.json
index acc316a416..6acdfe964f 100644
--- a/actions/setup/js/tsconfig.json
+++ b/actions/setup/js/tsconfig.json
@@ -1,8 +1,8 @@
 {
   "compilerOptions": {
-    "target": "es2020",
+    "target": "es2022",
     "module": "commonjs",
-    "lib": ["es2020"],
+    "lib": ["es2022"],
     "types": ["node"],
     "allowJs": true,
     "checkJs": true,