--- title: Schedule Callback description: "Let an agent book a callback at a time the caller chooses, placed later by one of your outbound campaigns. How to set it up and what it needs." --- Voice agents **Schedule Callback** lets the agent book a return call for the caller. The agent asks when they would like to be called back, and an outbound campaign places the call at that time. Use it when a caller cannot talk now, or when the answer they need is not available yet: the agent offers a time instead of ending the conversation with nothing booked. ## Before you start The tool places callbacks through an outbound campaign, so you need one. If the picker reads **No outbound campaigns found.**, create one first; see [Create an outbound campaign](/deploy/campaigns/create-an-outbound-campaign). ## Adding it 1. Open the agent and choose **Tools** under **Build**. 2. Choose **Add tool**, then **Schedule Callback**. 3. Under **Outbound campaign**, choose the campaign that should place the return calls. The list is searchable and shows outbound campaigns only; the field is required. 4. Choose **Add Tool**, then **Save** the agent. ## What the caller hears What the agent says is the tool's **AI Response**, which you can edit like on any other tool. The default is *I've scheduled your callback.* ## Writing the description The tool's description is what the model reads to decide when to use it. The default is *Schedule a callback for the caller through an outbound campaign at a time they choose.* Add your own conditions, for example: *Offer a callback only during opening hours, and only if the caller asks for one.* ## Related - [Tools overview](/build/tools/overview) - [Create an outbound campaign](/deploy/campaigns/create-an-outbound-campaign)