Can someone tell me what im doing wrong with this custom tool? I am trying to test out using default variables like {{now}} / {{time}} in a custom tool / api request and every time it just sends the value as the literal variable string (ie "{{now}}" sent in the body of the request). I thought these default variables were available for use automatically. I am testing the custom tool just by creating it and giving the agent access to it, its not running through a workflow { "id": "920df267-9da2-4e5e-bd2d-a0ccc2c079b7", "createdAt": "2025-10-09T05:48:52.518Z", "updatedAt": "2025-10-09T14:19:31.238Z", "type": "function", "function": { "name": "test-tool", "strict": true, "description": "Use this tool to test", "parameters": { "type": "object", "properties": { "time": { "description": "Current time", "type": "string", "default": "{{now}}" }, "random": { "description": "Make up a random number between 1 and 10", "type": "number", "default": "" } }, "required": [ "time", "random" ] } }, "messages": [ { "type": "request-start", "blocking": false } ], "orgId": "9c0ba0c9-2c50-4a99-89da-7582f7794797", "server": { "url": "https://n8nhooks.********.com/webhook/test" } } FYI this is being tested on an incoming call