diff --git a/scripts/agents/includes/__tests__/labeler-utils.test.js b/scripts/agents/includes/__tests__/labeler-utils.test.js
new file mode 100644
index 00000000..1c811bee
--- /dev/null
+++ b/scripts/agents/includes/__tests__/labeler-utils.test.js
@@ -0,0 +1,97 @@
+const {
+  matchesBranchPattern,
+  matchesFilePatterns,
+  determineLabelsFromRules,
+} = require("../labeler-utils.js");
+
+describe("labeler-utils", () => {
+  describe("matchesBranchPattern", () => {
+    test("matches regex and glob patterns", () => {
+      expect(matchesBranchPattern("feat/new-flow", ["^feat/.*"])).toBe(true);
+      expect(matchesBranchPattern("docs/readme", ["docs/*"])).toBe(true);
+      expect(matchesBranchPattern("fix/bug", ["^feat/.*", "docs/*"])).toBe(
+        false,
+      );
+    });
+
+    test("returns false for invalid regex patterns", () => {
+      expect(matchesBranchPattern("feat/new-flow", ["^(feat"])).toBe(false);
+    });
+  });
+
+  describe("matchesFilePatterns", () => {
+    const changedFiles = [
+      ".github/workflows/labeling.yml",
+      "docs/ISSUE_LABELS.md",
+      "scripts/agents/labeling.agent.js",
+    ];
+
+    test("supports any-glob-to-any-file", () => {
+      const config = {
+        "any-glob-to-any-file": [".github/workflows/**", "src/**"],
+      };
+      expect(matchesFilePatterns(changedFiles, config)).toBe(true);
+    });
+
+    test("supports all-globs-to-all-files", () => {
+      const config = {
+        "all-globs-to-all-files": [".github/workflows/**", "docs/**"],
+      };
+      expect(matchesFilePatterns(changedFiles, config)).toBe(true);
+    });
+
+    test("supports any-glob-to-all-files", () => {
+      const markdownFiles = ["docs/ISSUE_LABELS.md", "docs/ISSUE_TYPES.md"];
+      const config = {
+        "any-glob-to-all-files": ["docs/**/*.md", "scripts/**/*.js"],
+      };
+      expect(matchesFilePatterns(markdownFiles, config)).toBe(true);
+    });
+  });
+
+  describe("determineLabelsFromRules", () => {
+    test("applies branch and file labels exactly once", () => {
+      const context = {
+        payload: {
+          pull_request: {
+            number: 427,
+            head: { ref: "feat/label-hardening" },
+          },
+        },
+      };
+
+      const labelerRules = {
+        "type:feature": {
+          "head-branch": ["^feat/.*"],
+        },
+        "area:ci": {
+          "changed-files": {
+            "any-glob-to-any-file": [".github/workflows/**"],
+          },
+        },
+        "area:labels": {
+          "head-branch": ["^feat/.*"],
+          "changed-files": {
+            "any-glob-to-any-file": ["scripts/agents/**"],
+          },
+        },
+      };
+
+      const changedFiles = [
+        ".github/workflows/labeling.yml",
+        "scripts/agents/labeling.agent.js",
+      ];
+
+      const labels = determineLabelsFromRules(
+        context,
+        labelerRules,
+        changedFiles,
+      );
+
+      expect(labels).toContain("type:feature");
+      expect(labels).toContain("area:ci");
+      expect(labels).toContain("area:labels");
+      expect(labels.filter((label) => label === "area:labels")).toHaveLength(1);
+    });
+  });
+});
diff --git a/scripts/agents/includes/labeler-utils.js b/scripts/agents/includes/labeler-utils.js
index 5db88da4..3a8c72b2 100644
--- a/scripts/agents/includes/labeler-utils.js
+++ b/scripts/agents/includes/labeler-utils.js
@@ -14,10 +14,13 @@
 
 import fs from "fs";
 import yaml from "js-yaml";
-import core from "@actions/core";
+import * as core from "@actions/core";
 import minimatchPackage from "minimatch";
 
-const { minimatch } = minimatchPackage;
+const minimatch =
+  typeof minimatchPackage === "function"
+    ? minimatchPackage
+    : minimatchPackage.minimatch;
 
 /**
  * Loads labeler rules from YAML configuration file