>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3516052. --> Reported by: [andrewbelcher](https://www.drupal.org/user/655282) Related to !534 >>> <h3 id="summary-problem-motivation">Problem/Motivation</h3> <p>There are some scenarios where you want to have a constant property for a function call so that LLM knows what is happening. This is also useful for cases such as AI Agents where you can implement configuration to restrict or force values.</p> <h3 id="summary-proposed-resolution">Proposed resolution</h3> <p>Refine the function call schema to allow for setting constants.</p> <h3 id="summary-api-changes">API changes</h3> <p>A new <code>FixedValue</code> constraint.</p>