### Answer The original

@abhaybabbar/retellai-mcp-server

package has a known bug related to Zod (a validation library) that causes it to crash when Claude requests the tools list. [(1) ]() Solution: Use the alternative npm package

@jesec/retellai-mcp-server

instead. , [(2) ]() In Claude Desktop, go to Settings → Developer → Edit Config and update your MCP server entry to: [(1) ]() , [(2) ]()

json
{
  "mcpServers": {
    "retell": {
      "command": "npx",
      "args": ["-y", "@jesec/retellai-mcp-server"],
      "env": {
        "RETELL_API_KEY": "YOUR_RETELL_KEY_HERE"
      }
    }
  }
}

​ To learn more, see the sources I considered: [[1] Discord message from @mroverworked on 2026-01-02](https://discord.com/channels/1186424376300679209/1186462578310910112/1456456063602917518) [[2] Discord message from @mroverworked on 2026-01-02](https://discord.com/channels/1186424376300679209/1186462578310910112/1456456066899513414) [[3] MCP server connection between Retell and Claude](https://discord.com/channels/1186424376300679209/1374739679487852594) [[4] How to Connect Retell AI MCP Server to Claude & More | Retell AI | Retell AI](https://www.retellai.com/blog/connect-retell-ai-mcp-server-to-ai-assistant) ​

[(1) ]() , [(2) ]() Additional troubleshooting: - Make sure Node.js is installed so that

npx

is available in your PATH [(3) ]() - On Windows, you may need to use

"command": "cmd"

and

"args": ["/c", "npx", "-y", "@jesec/retellai-mcp-server"]

- After saving the config, restart Claude completely (quit and reopen) to register the new server [(4) ]() The official resources for the Retell MCP Server are: - [Retell MCP Server Package (NPM) ]() - [Retell MCP Server Repository (Github) ]()

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.

@AI Evy https://cdn.discordapp.com/attachments/1478738953455796274/1478744299825926164/message.txt?ex=69a98372&is=69a831f2&hm=5092e742ce190db639fbe7373229b948a0f441be5bc843daeea33e6711de1d93&

### Answer --- It looks like you're following up on the MCP connection issue. Based on the previous response in this thread, the recommended solution is to use the alternative package

@jesec/retellai-mcp-server

instead of the original one, which has a known bug. Here's a quick recap of what you need to do: 1. Open Claude Desktop → Settings → Developer → Edit Config [(1) ]() 2. Update your configuration to use the working package:

json
{
  "mcpServers": {
    "retell": {
      "command": "npx",
      "args": ["-y", "@jesec/retellai-mcp-server"],
      "env": {
        "RETELL_API_KEY": "YOUR_RETELL_KEY_HERE"
      }
    }
  }
}

3. Save the file and restart Claude completely (quit and reopen the application) to register the new server Additional tips: - Make sure Node.js is installed so

npx

is available in your PATH - On Windows, you may need to use

"command": "cmd"

and

"args": ["/c", "npx", "-y", "@jesec/retellai-mcp-server"]

Is there a specific error you're encountering when trying to connect, or does this help resolve your issue?

​ To learn more, see the sources I considered: [[1] How to Connect Retell AI MCP Server to Claude & More | Retell AI | Retell AI](https://www.retellai.com/blog/connect-retell-ai-mcp-server-to-ai-assistant) ​

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.

### Answer I don't have detailed troubleshooting information for the Retell AI MCP Server connection issues in my available sources. The Retell MCP Server was announced in the changelog, allowing you to connect AI assistants like Claude to Retell's voice agent platform. [(1) ]() Since the alternative package and previous suggestions aren't resolving your issue, here are some next steps: Check these potentially useful sources: - [How to Connect Retell AI MCP Server to Claude & More]() - [Documentation]() - [Hire certified Retell partner]() Could you share more details about your issue? - What specific error message are you seeing? - What operating system are you using (Windows/Mac/Linux) ? - Have you confirmed Node.js is installed by running

node -v

in your terminal? This will help narrow down the problem. Would you like me to try to answer generally based on my knowledge instead?

​ To learn more, see the sources I considered: [[1] Platform Changelogs | Retell AI](https://www.retellai.com/changelog) ​

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.