Retell AI MCP Server

Voice agent phone calls, batch calling campaigns, call management, agent configuration, LLM prompt management, knowledge bases, chat history, and voice discovery via Retell AI API. Its 32 documented tools cover agent, retell, phone, llm.

People connecting productivity tools to Claude, Cursor, VS Code, or another MCP client. The project is written in TypeScript.

One of 41 MCP servers published from mindstone/mcp-servers. Stars and repository activity are shared across all of them. See all 41 →

VERIFIED ACTIVE

LAST COMMIT 2026-08-19 · VERIFIED 2026-08-25

NOASSERTION · TypeScript servers · how we verify → /methodology

01 · Install Retell AI

before you install - you'll need

RETELL_API_KEY

Environment variables documented in the project's README - it lists which are required and which have defaults.

Claude Code

claude mcp add mindstone-mcp-servers-connectors-retell- -- npx -y @mindstone/mcp-server-retell-ai

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "mindstone-mcp-servers-connectors-retell-": {
      "command": "npx",
      "args": [
        "-y",
        "@mindstone/mcp-server-retell-ai"
      ]
    }
  }
}

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as local process (stdio) - runs on your machine with your user's permissions

license no standard license detected - usage rights unclear; check the repo before commercial use

npm package @mindstone/mcp-server-retell-ai - published under the repo owner's npm scope (@mindstone)

registry namespace io.github.mindstone is GitHub-verified and matches the repo owner

03 · What Retell AI can do

Prose above is summarized from the project's README and registry record - no invented capabilities.

What you can build

With this server connected, an agent can create an outbound phone call using a Retell AI voice agent, create a browser-based voice call with a Retell AI agent, get details about a specific call (status, transcript, recording), and list and filter calls by agent, time range, or status.

Capability map

Tools grouped from the project's README - what Retell AI lets an agent do.

read & search

6 tools - e.g. Get details about a specific call (status, transcript, recording); List and filter calls by agent, time range, or status; Check account call-capacity headroom before a batch or burst

get_call · list_calls · get_concurrency · list_agents · list_chats · list_voices

Agent

6 tools - e.g. Get full configuration of a voice agent; Create a new voice agent; Update an existing agent's configuration

get_agent · create_agent · update_agent · publish_agent · get_agent_versions · delete_agent

Retell

6 tools - e.g. Update the LLM configuration (prompt, greeting, model); Get the full LLM configuration; Create a new LLM configuration

update_retell_llm · get_retell_llm · create_retell_llm · list_retell_llms · delete_retell_llm · configure_retell_api_key

Phone

5 tools - e.g. Create an outbound phone call using a Retell AI voice agent; List registered phone numbers; Get details of a specific phone number

create_phone_call · list_phone_numbers · get_phone_number · update_phone_number · delete_phone_number

Knowledge

4 tools - e.g. List knowledge bases and their processing status; Get a knowledge base's sources and status; Create a knowledge base from texts, URLs, and/or sandboxed local files

list_knowledge_bases · get_knowledge_base · create_knowledge_base · add_knowledge_base_sources

create & write

2 tools - e.g. Create a browser-based voice call with a Retell AI agent; Schedule or start an outbound calling campaign (one from_number, many recipients)

create_web_call · create_batch_call

Chat

2 tools - e.g. List configured chat agents (paginated); Get a chat's full transcript and analysis

list_chat_agents · get_chat

run & execute

1 tool - e.g. Terminate an active call

stop_call

04 · Who maintains Retell AI

Retell AI is maintained by mindstone. We track 41 MCP servers from mindstone - 41 actively maintained, 10 combined GitHub stars, oldest repo from Apr 2026. Full record: all servers from mindstone.

05 · Facts

repository: github.com/mindstone/mcp-servers
category: productivity - actively maintained as of 2026-08-25.
registry: io.github.mindstone/mcp-server-retell-ai (active, first published 2026-05-21 · 4 versions)
packages: npm:@mindstone/mcp-server-retell-ai

06 · Retell AI FAQ

Is Retell AI still maintained?

Yes - as of 2026-08-25, its last commit was 2026-08-19. We re-verify nightly.

What can Retell AI do?

How do I install Retell AI?

Run `npx -y @mindstone/mcp-server-retell-ai`. The README documents one environment variable (RETELL_API_KEY) to set first. You can also paste the ready-made client config above.

Does Retell AI run locally?

Yes - it's a stdio server: it runs on your machine (via npx) with your user's permissions. Your data stays local unless the server itself calls external APIs.

07 · Alternatives to Retell AI

Alternatives to Retell AI

Maintained productivity servers if Retell AI isn't the fit.

Pairs well with

Servers that cover what Retell AI doesn't - only shown when the pairing reason fits the companion.

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