### Answer I don't have specific documentation about MCP tools not appearing when using Claude models in Retell AI. However, here are a few things to check: 1. Verify MCP Configuration MCP support was introduced in Retell AI and allows you to connect your own MCPs and invoke tools seamlessly. [(1) ]() Make sure your MCP is properly configured with the required fields including

name

,

url

,

headers

,

query_params

, and

timeout_ms

. [(2) ]() , [(3) ]() 2. Check Tool Definitions Ensure your tools are properly defined in the

general_tools

array or within your

states

configuration. Tools need explicit descriptions for the LLM to recognize when to call them. [(4) ]() , [(5) ]() 3. Try Strengthening Tool Instructions For tools not being triggered, Retell recommends giving explicit trigger conditions for each tool in the system prompt, not just a vague description. [(6) ]() 4. Consider Model-Specific Issues There have been reports of Claude models having specific behaviors with Retell's prompts. [(7) ]() If issues persist with Claude, you might try switching to a different model temporarily (like GPT-4.1) to verify if the MCP tools work correctly. [(2) ]() , [(3) ]() For further assistance with this MCP/Claude issue, check out: - [MCP Documentation]() - [Video Tutorial](https:

//www.youtube.com/watch?v=efmWhp8Pd5I) [(1) ]() Would you like me to provide a general answer based on my knowledge instead?

​ To learn more, see the sources I considered: [[1] Platform Changelogs | Retell AI](https://www.retellai.com/changelog) [[2] List Retell LLMs](https://docs.retellai.com/api-references/list-retell-llms) [[3] Update Retell LLM](https://docs.retellai.com/api-references/update-retell-llm) [[4] Integrate Function Calling](https://docs.retellai.com/integrate-llm/integrate-function-calling) [[5] Prompt Engineering Guide](https://docs.retellai.com/build/prompt-engineering-guide) [[6] Tools not being triggered](https://community.retellai.com/t/tools-not-being-triggered/201) [[7] Claude 3.7 Sonnet reads Retell's prompts](https://discord.com/channels/1186424376300679209/1348725213163945994) ​

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

### Answer To connect the Retell AI MCP Server to Claude, follow these steps: [(1) ]() 1. Open Claude → Select "Settings" 2. Click on "Developer" in the settings menu 3. Select "Edit Config" to access your configuration settings 4. Open the JSON file using your preferred code editor 5. Visit the [Retell AI MCP server NPM page]() and copy the configuration snippet 6. Paste the configuration into your JSON file 7. Generate a new Retell AI API token if you don't already have one 8. Replace the placeholder in your configuration with your newly generated API token 9. Save your configuration file 10. Restart Claude completely (quit and reopen the application) to register the new server Important: When using the Retell AI MCP server for the first time, you may be prompted to grant permissions. You can choose to "Always Allow" for seamless future use. After completing these steps, you should find the Retell AI MCP server in your tools list in Claude, confirming successful integration. For additional resources: - [Retell MCP Server Package (NPM) ]() - [Retell MCP Server Repository (Github) ]()

​ 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.