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diff --git a/tests/test-ai-term--agent-buffers.el b/tests/test-ai-term--agent-buffers.el
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+;;; test-ai-term--agent-buffers.el --- Tests for cj/--ai-term-agent-buffers -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; The helper returns the list of buffers whose names start with the
+;; literal prefix "agent [".  Order is the same order `buffer-list'
+;; gives them (most-recently-selected first).  Non-agent buffers and
+;; buffers whose names merely contain the prefix as a substring are
+;; excluded.
+
+;;; Code:
+
+(require 'ert)
+
+(add-to-list 'load-path (expand-file-name "modules" user-emacs-directory))
+(add-to-list 'load-path (expand-file-name "tests" user-emacs-directory))
+(require 'ai-term)
+(require 'testutil-ghostel-buffers)
+
+(ert-deftest test-ai-term--agent-buffers-empty-when-none-exist ()
+  "Boundary: no agent-prefixed buffers anywhere -> empty list."
+  (cj/test--kill-agent-buffers)
+  (unwind-protect
+      (should (null (cj/--ai-term-agent-buffers)))
+    (cj/test--kill-agent-buffers)))
+
+(ert-deftest test-ai-term--agent-buffers-returns-only-agent-buffers ()
+  "Normal: filters to only agent-prefixed buffers, leaves others alone."
+  (cj/test--kill-agent-buffers)
+  (let ((c1 (get-buffer-create "agent [a]"))
+        (c2 (get-buffer-create "agent [b]"))
+        (other (get-buffer-create "regular-buffer")))
+    (unwind-protect
+        (let ((result (cj/--ai-term-agent-buffers)))
+          (should (memq c1 result))
+          (should (memq c2 result))
+          (should-not (memq other result))
+          (should (= (length result) 2)))
+      (kill-buffer c1)
+      (kill-buffer c2)
+      (kill-buffer other))))
+
+(ert-deftest test-ai-term--agent-buffers-anchors-prefix-not-substring ()
+  "Boundary: 'foo agent [bar]' is not an agent buffer -- prefix anchored."
+  (cj/test--kill-agent-buffers)
+  (let ((not-agent (get-buffer-create "foo agent [bar]")))
+    (unwind-protect
+        (should-not (memq not-agent (cj/--ai-term-agent-buffers)))
+      (kill-buffer not-agent))))
+
+(ert-deftest test-ai-term--agent-buffers-bare-agent-not-included ()
+  "Boundary: 'agent' alone (no bracket) doesn't match the 'agent [' prefix."
+  (cj/test--kill-agent-buffers)
+  (let ((bare (get-buffer-create "agent")))
+    (unwind-protect
+        (should-not (memq bare (cj/--ai-term-agent-buffers)))
+      (kill-buffer bare))))
+
+(provide 'test-ai-term--agent-buffers)
+;;; test-ai-term--agent-buffers.el ends here