Make it possible to @ mention an subagent
>>> [!note] Migrated issue
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Reported by: [marcus_johansson](https://www.drupal.org/user/385947)
Related to !1336
>>>
<p>[Tracker]<br>
<strong>Update Summary: </strong>[One-line status update for stakeholders]<br>
<strong>Short Description: </strong>[One-line issue summary for stakeholders]<br>
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<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>Make a prototype, that makes it possible to use @ sign to call specific subagents that the assistant happens to have directly.</p>
<p>This means the following logic:</p>
<ul>
<li>No @ sign - the conversation message is passed to the orchestration agent. It works like it always worked.</li>
<li>One @ sign to a connected agent - the conversation message is passed to this agent instead.</li>
<li>Two or more @ sign to connected agents - the chat will repond that this is not allowed, without actually passing it on to the agent.</li>
</ul>
<p>Rules to follow:</p>
<ul>
<li>Only agents that has been attached to the assistant can be mentioned.</li>
<li>Conversation history is kept as it is, since its stateless it can easily be pass around.</li>
</ul>
<h3 id="summary-proposed-resolution">Proposed resolution</h3>
<p>Implement it like above.</p>
<h3 id="summary-remaining-tasks">Remaining tasks</h3>
<h3>Optional: Other details as applicable (e.g., User interface changes, API changes, Data model changes)</h3>
<h3 id="summary-ai-usage">AI usage (if applicable)</h3>
<p>[ ] AI Assisted Issue<br>
This issue was generated with AI assistance, but was reviewed and refined by the creator.</p>
<p>[ ] AI Assisted Code<br>
This code was mainly generated by a human, with AI autocompleting or parts AI generated, but under full human supervision.</p>
<p>[ ] AI Generated Code<br>
This code was mainly generated by an AI with human guidance, and reviewed, tested, and refined by a human.</p>
<p>[ ] Vibe Coded<br>
This code was generated by an AI and has only been functionally tested.</p>
issue