> ## Documentation Index > Fetch the complete documentation index at: https://docs.duvo.ai/llms.txt > Use this file to discover all available pages before exploring further. # Custom MCP The Custom MCP connection lets you link Duvo to any system not covered by a built-in connection. You provide the URL of your own MCP-compatible server, and Duvo connects to it so your agents can use the tools that server exposes. ## Setup Custom MCP connections require a deployed MCP server that is accessible over the internet. Follow these steps to deploy your server and connect it to Duvo. Your MCP server must be accessible over the internet via a public HTTPS URL (localhost is not supported), and must support streamable HTTP transport (STDIO and HTTP/SSE are not supported). Build and deploy an MCP server that implements the tools you need. The server must be reachable at a public HTTPS endpoint. For guidance on building an MCP server, see [Building Custom Connections](/user-guide/connections/building-custom-connections). 1. Open the [Connections page](https://app.duvo.ai/integrations). 2. Click **Add custom connection** at the bottom of the available connections list. 3. Enter a **Connection name** that your team will recognize (for example, "Internal CRM" or "Warehouse API"). 4. Choose an **Authorization method**: * **None** — No authentication required. Use this for servers that handle auth at the network level or have no auth. * **Access token / API key** — Your server requires a static token or API key. Each teammate enters their own credentials when they connect. * **Custom headers** — Your server requires specific HTTP headers for authentication. Each teammate provides their own header values. * **OAuth** — Your server uses OAuth for authentication. See the OAuth section below for details. 5. Enter the **Server URL** — the public HTTPS URL of your deployed MCP server (for example, `https://example.com/mcp`). 6. Click **Create** to add the connection type to your team's catalog. After the connection type is created, each teammate clicks **Enable** on the new connection card and provides their own credentials based on the authorization method chosen in the previous step. ### OAuth setup When you select OAuth as the authorization method and enter a server URL, Duvo automatically checks whether the server supports OAuth and **dynamic client registration (DCR)**. * **If the server does not support OAuth:** An error message appears suggesting you use a different authorization method. * **If DCR is supported:** No additional credentials are needed. The connection is handled automatically. * **If DCR is not supported:** The **Advanced settings** section opens automatically with the Client ID and Secret fields marked as required. Enter your **OAuth Client ID** and **OAuth Client Secret**. This section also displays a redirect URI that you need to register in your OAuth provider. You can also provide a Client ID and Secret manually through **Advanced settings** if you prefer to use a pre-registered OAuth app instead of automatic registration. ## Capabilities * **Access proprietary systems** — Connect to internal tools, legacy platforms, or custom-built APIs that are not available as standard connections. * **Call custom tools** — Use any tools your MCP server exposes directly within agent workflows. * **Authenticate securely** — Support multiple authentication methods including API key, custom headers, and OAuth, depending on your server's requirements. * **Extend Duvo's reach** — Add domain-specific functionality tailored to your organization's needs without waiting for a built-in connection. ## Key Benefits * **Unlimited connection scope** — Connect to any system you can build an MCP server for, without waiting for a built-in connection to exist. * **Full control** — You own and manage the server, so you decide what tools are available and what data is exposed. * **Consistent workflow** — Custom tools work the same way as built-in connections. Your agents use them without special handling. * **Secure by design** — Credentials stay within Duvo's connection setup and are not exposed in agent instructions. * **Team-wide catalog** — Add a custom connection once and every teammate can connect with their own credentials. ## Works Well With Use a custom MCP server to pull data from a proprietary system, then use the Browser connection to enter that data into a web-based downstream tool. Retrieve records from an internal system via custom MCP and send automated email summaries. Retrieve records from an internal system via custom MCP and send automated email summaries. Fetch data from a proprietary operational system through custom MCP and combine it with warehouse queries for unified reporting. Fetch data from a proprietary operational system through custom MCP and combine it with warehouse queries for unified reporting.