> ## Documentation Index > Fetch the complete documentation index at: https://docs.cassidyai.com/llms.txt > Use this file to discover all available pages before exploring further. # Deploy via API > Integrate your Agent into any application using the Cassidy API for programmatic access. Use the Cassidy API to integrate your [Agent](/agents/overview) into any custom application, internal tool, or [Workflow](/workflows/overview). **Prerequisites:** * An Agent created in Cassidy * An API key (or the ability to create one) Go to **Agents** and select the Agent you want to deploy via API. Click **Edit** to open the Agent settings. Agents page showing the list of available Agents Navigate to the **Deployments** tab and select **Deploy via API**. Agent settings with the Deployments tab selected Deploy via API section showing setup instructions and sample code Click the **API Keys** link in the instructions, or navigate manually: click your name in the bottom left of the sidebar, then click the settings icon for your organization. Sidebar showing the organization settings gear icon In the **Organization Settings** window, go to the **API Keys** tab. Organization Settings window with the API Keys tab selected Click **+ Create API Key**, enter a name for the key, and click **Save**. Click the eye icon to reveal the key, then copy it and save it to a secure location. Click **Exit** when finished. Create API Key dialog with name field and Save button API key revealed with copy button and Exit option Copy and save your API key immediately — you won't be able to see it again after closing the dialog. Return to the **Deploy via API** tab in your Agent's settings. Follow the sample code provided to create conversation threads and send messages programmatically. Deploy via API tab showing sample code for creating threads and sending messages ## API basics The Cassidy API uses threads and messages to manage conversations: 1. **Create a thread** — start a new conversation with the Agent 2. **Send a message** — add a user message to the thread 3. **Receive a response** — the Agent processes the message and returns a reply For detailed endpoint documentation, request formats, and authentication details, see the [Cassidy API documentation](https://app.cassidyai.com/api-docs). Keep your API key secure. Do not share it publicly or commit it to version control. You can delete an API key at any time from the **API Keys** tab by clicking the ellipsis menu and selecting **Delete**. ## Next steps Learn more about creating and configuring Agents. Deploy your Agent to a dedicated email address. Embed your Agent on a website without writing code.