Retell AI MCP. Run full conversational agents from chat.

This server hooks your agent client straight into a full telecom stack for building voice-driven agents. You ditch the Postman setup; you use simple chat instructions to manage the whole call life cycle—from setting up intelligent voices to placing actual calls.

Agent Management

Use create_agent when you wanna set up a brand new AI personality for your account. That function lets you define and create that unique voice bot agent. If you need to change what an existing agent knows or how it talks, run update_agent. This modifies the instructions or parameters of agents already running on your system.

To see every single AI agent you've configured, just call list_agents.

Conversational Configuration

To set up the brain for any agent, use create_llm. You configure the Large Language Model here; it dictates exactly how the agent talks and what its conversation logic is. The system needs to know which voices you wanna use—run list_voices to see every text-to-speech voice available for selection.

Initiating Calls and Web Interactions

Need to talk to somebody? You initiate an immediate, outbound phone call by calling create_phone_call, where you gotta provide both the source number and the target number in a JSON payload. If you need to know what numbers your account has available for these calls, run list_phone_numbers to see every associated number displayed.

For web interactions, use register_web_call. This sets up the parameters needed so your conversational AI can talk and listen right inside a web browser environment. You also have create_llm, which you're gonna need before any of these calls happen.

Monitoring Call History and Details

You gotta track what happens. To get an overview or log of every call, active or historical, you use list_calls. If you want the deep dive on a single interaction, run get_call_details. This function pulls a full record for one specific call, including transcripts and detailed sentiment analysis.

Grouping Capabilities: What You Can Do With These Tools

To build your agent's core identity, first use create_agent to establish the unique personality. Then you can modify that bot later using update_agent. If you need a full list of all agents configured across your account, check list_agents. The conversation logic is handled by setting up the underlying AI brain with create_llm.

If you're going to make phone calls, you start by checking available resources. Run list_phone_numbers to see which numbers are linked to your Retell account. You then kick off an immediate call using create_phone_call, specifying the source and destination numbers in the payload. For web-based conversations, calling register_web_call sets up the necessary audio session parameters within a browser context.

To keep tabs on what's been said, you query historical data using list_calls. If you need deep insights into one interaction, use get_call_details; this pulls transcripts and sentiment analysis for that specific call. Finally, if you wanna see which voices are ready to go, run list_voices.