RetellAi MCP Server
Most AI and media services work still happens through a UI a human drives. Retellai MCP server moves it into the conversation instead. RetellAi MCP Server.
This is a Model Context Protocol (MCP) server implementation for RetellAI, allowing AI assistants to interact with RetellAI's voice services.
The server publishes 14 tools. What each one is for:
list_calls — Lists all Retell callscreate_phone_call — Creates a new phone callcreate_web_call — Creates a new web callget_call — Gets details of a specific calldelete_call — Deletes a specific calllist_agents — Lists all Retell agentscreate_agent — Creates a new Retell agentget_agent — Gets a Retell agent by IDupdate_agent — Updates an existing Retell agentdelete_agent — Deletes a Retell agentget_agent_versions — Gets all versions of a Retell agentlist_phone_numbers — Lists all Retell phone numbersThe server ships on npm as @abhaybabbar/retellai-mcp-server, so your MCP client can launch it on demand — there is no separate build step. Add the server block to your client's configuration, restart it, and the tools register themselves.
Configuration is passed through the environment: RETELL_API_KEY. Treat anything key-shaped as a real credential — scope it to the minimum the server needs, and rotate it if it ever lands in a shared config.
This sits in the AI and media services group, where several servers overlap in what they claim to do but differ sharply once you actually set them up. Retellai's toolset — list_calls, create_phone_call, create_web_call and 11 more — is a fair guide to whether it matches your workflow. It is maintained by abhaybabbar; worth a glance at recent repository activity before you build anything load-bearing on it.
We check each listing at SyncDev against the project's documentation before it goes live — if something here drifts out of date, it is a bug worth reporting.
| Tool | What it does |
|---|---|
| list_calls | Lists all Retell calls |
| create_phone_call | Creates a new phone call |
| create_web_call | Creates a new web call |
| get_call | Gets details of a specific call |
| delete_call | Deletes a specific call |
| list_agents | Lists all Retell agents |
| create_agent | Creates a new Retell agent |
| get_agent | Gets a Retell agent by ID |
| update_agent | Updates an existing Retell agent |
| delete_agent | Deletes a Retell agent |
| get_agent_versions | Gets all versions of a Retell agent |
| list_phone_numbers | Lists all Retell phone numbers |
| create_phone_number | Creates a new phone number |
| get_phone_number | Gets details of a specific phone number |
{
"mcpServers": {
"retellai-mcp-server": {
"command": "npx",
"args": ["-y", "@abhaybabbar/retellai-mcp-server"],
"env": {
"RETELL_API_KEY": "<your_retellai_token>"
}
}
}
}Configuration as documented by the project. Restart the client after saving.
| Variable | Description | Required |
|---|---|---|
| RETELL_API_KEY | Credential the server authenticates with. | Yes |
Search built for AI, not humans — semantic web search that returns model-ready content, plus code context.
Answers, not links — delegate questions to Perplexity's search-grounded models and get cited responses back.
Give your assistant a voice — text-to-speech, voice cloning and audio tools from the ElevenLabs API.
Give your assistant a real code sandbox — isolated cloud VMs for actually running the code it writes.
The ML hub in your context window — search models, datasets, papers and run Spaces from the official server.
Thousands of open models on tap — run image, video and audio generation through Replicate's hosted API.