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diff --git a/tests/test-fs-list-directory-recursive.el b/tests/test-fs-list-directory-recursive.el
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+;;; test-tool-library-fs-list-directory-recursive.el --- ERT tests for cj/fs-list-directory-recursive -*- lexical-binding: t; -*-
+
+;; Author: gptel-tool-writer and cjennings
+;; Keywords: tests, filesystem, tools
+
+;;; Commentary:
+;; ERT tests for the cj/fs-list-directory-recursive function from tool-filesystem-library.el.
+;; Place this file in ~/.emacs.d/tests/ and load it to run tests.
+
+;;; Code:
+
+(require 'ert)
+(require 'f)
+(require 'tool-filesystem-library)
+
+(defvar cj/fs-test--temp-dir nil "Temporary temp directory for fs-list-directory-recursive tests.")
+
+(defun cj/fs-test--setup ()
+  "Set up temp directory for fs-list-directory-recursive tests."
+  (setq cj/fs-test--temp-dir (make-temp-file "fs-lib-test" t))
+  ;; Create test directory structure
+  (make-directory (f-join cj/fs-test--temp-dir "subdir") t)
+  (make-directory (f-join cj/fs-test--temp-dir "subdir2") t)
+  (with-temp-buffer (insert "Test file 1") (write-file (f-join cj/fs-test--temp-dir "file1.org")))
+  (with-temp-buffer (insert "Test file 2") (write-file (f-join cj/fs-test--temp-dir "subdir" "file2.txt")))
+  (with-temp-buffer (insert "Test file 3") (write-file (f-join cj/fs-test--temp-dir "subdir2" "file3.org")))
+  (make-directory (f-join cj/fs-test--temp-dir ".hiddendir") t)
+  (with-temp-buffer (insert "Secret") (write-file (f-join cj/fs-test--temp-dir ".hiddendir" "secret.txt"))))
+
+(defun cj/fs-test--teardown ()
+  "Clean up temp directory for fs-list-directory-recursive tests."
+  (when (and cj/fs-test--temp-dir (file-directory-p cj/fs-test--temp-dir))
+	(delete-directory cj/fs-test--temp-dir t))
+  (setq cj/fs-test--temp-dir nil))
+
+(ert-deftest test-cj/fs-list-directory-recursive-normal-recursive-filter ()
+  "Normal: recursive listing with filter."
+  (cj/fs-test--setup)
+  (unwind-protect
+	  (let* ((filter-fn (lambda (fi) (string-suffix-p ".org" (f-filename (plist-get fi :path)))))
+			 (files (cj/fs-list-directory-recursive cj/fs-test--temp-dir filter-fn)))
+		(should (cl-some (lambda (fi) (string= (f-filename (plist-get fi :path)) "file1.org")) files))
+		(should (cl-some (lambda (fi) (string= (f-filename (plist-get fi :path)) "file3.org")) files))
+		(should-not (cl-some (lambda (fi) (string= (f-filename (plist-get fi :path)) "file2.txt")) files)))
+	(cj/fs-test--teardown)))
+
+(ert-deftest test-cj/fs-list-directory-recursive-normal-max-depth ()
+  "Normal: recursive listing with max depth limit."
+  (cj/fs-test--setup)
+  (unwind-protect
+	  (let* ((filter-fn (lambda (_) t))
+			 (files (cj/fs-list-directory-recursive cj/fs-test--temp-dir filter-fn 1)))
+		(should (cl-some (lambda (fi) (string= (f-filename (plist-get fi :path)) "file1.org")) files))
+		(should-not (cl-some (lambda (fi) (string= (f-filename (plist-get fi :path)) "file3.org")) files)))
+	(cj/fs-test--teardown)))
+
+(ert-deftest test-cj/fs-list-directory-recursive-error-non-directory ()
+  "Error: non-directory input."
+  (should-error (cj/fs-list-directory-recursive "/etc/hosts")))
+
+(ert-deftest test-cj/fs-list-directory-recursive-boundary-empty-dir ()
+  "Boundary: recursive listing in empty directory."
+  (make-temp-file "empty-dir" t)
+  (let ((empty (make-temp-file "empty-dir" t)))
+	(unwind-protect
+		(progn
+		  (should (equal (cj/fs-list-directory-recursive empty) nil))
+		  (delete-directory empty)))))
+
+(provide 'test-tool-library-fs-list-directory-recursive)
+;;; test-tool-library-fs-list-directory-recursive.el ends here