Add new ToolKind: SubAgent

[Zane-XY]

Please support the new SubAgent tool kind and let the UI to render the parallel subagent tool calls in isolation or in hierarchical UI.

[hancengiz]

Is there a plan for this?
I see Claude Agent ACP sends the subagents like this but it is not defined in the protocol. I do not want to do a custom implementation but I would like to show subagent chats like codex.app does as sub chats in the fabriqa UI. Is there an RFD in plan for this?

[22:12:23.736] ← IN
{
"jsonrpc": "2.0",
"method": "session/update",
"params": {
"sessionId": "dfd0497b-08ae-4dd9-bd38-1fd4d7a8e75a",
"update": {
"_meta": {
"claudeCode": {
"toolName": "Agent"
}
},
"toolCallId": "toolu_018m6W1nTNAc13UJWp9P2JHh",
"sessionUpdate": "tool_call_update",
"rawInput": {
"description": "Investigate Go server memory",
"subagent_type": "Explore",
"prompt": "I need to understand why the....."
},
"title": "Investigate Go server memory",
"kind": "think",
"content": [
{
"type": "content",
"content": {
"type": "text",
"text": "I need to understand why........"
}
}
]
}
}
}