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       <tr><td><code>checkpoint-del</code></td><td>Delete a checkpoint</td><td><code>checkpoint-del</code></td></tr>
       <tr><td><code>smart-prompt</code></td><td>Toggle context-aware prompt</td><td><code>smart-prompt</code></td></tr>
       <tr><td><code>test</code></td><td>Run test suite</td><td><code>test auto</code></td></tr>
+      <tr><td><code>[ … ]</code> / <code>test …</code></td><td>POSIX file and string test for chains — silent, combines with <code>&amp;&amp;</code> / <code>||</code>. Operators: <code>-f</code> <code>-d</code> <code>-e</code> <code>-z</code> <code>-n</code> <code>!</code> <code>=</code> <code>!=</code>. The expression form of <code>test</code> is routed to this; <code>test</code> with no expression still runs the suite.</td><td><code>[ -f /notes.txt ] &amp;&amp; echo yes</code></td></tr>
     </table></div>
 
     <h3>AI Assistant</h3>