Integration · Communication

Connect Claude & ChatGPT to Retell AI

Ask your AI what happened on yesterday's calls, what a caller said, or to have an agent phone a customer. It reads calls with transcripts, recordings, analysis and cost, and works with your voice agents, phone numbers, contacts and knowledge bases in Retell AI. You can review your voice agents' work without exporting call logs.

Connect Retell AI free

Free plan, no credit card. Takes about a minute.

Try asking

“Summarize the calls our support agent handled yesterday.”
The AI lists calls filtered by agent and date, then reads each call's transcript and call analysis.
“What did the caller on call 8f2a say about the delivery?”
It gets the call with its transcript, recording URL, duration, status and analysis.
“Have our booking agent call +4512345678 to confirm tomorrow's appointment.”
It starts an outbound call from one of your Retell numbers, run by the agent on that number, with any dynamic variables you give. The call is placed right away.

What your AI can do

Calls and transcripts

List and filter calls, read transcripts, recordings, call analysis and cost, update call metadata and end an ongoing call.

Outbound calls and SMS

Start phone calls and SMS chats from your Retell numbers, and read chat and SMS conversations with their messages.

Agents, numbers and contacts

Read voice agents, voices and knowledge bases, add knowledge base sources, change which agents handle a number, and manage contacts.

“Text Maria that her order is ready.”
It starts an SMS conversation from your Retell number, run by the number's SMS agent. A real text message is sent.
“Add our new pricing page to the sales agent's knowledge base.”
It adds the web page as a source to the knowledge base the agent uses.
“Which agent answers inbound calls on our main number?”
It reads the phone number's settings and shows which inbound and outbound agents it uses.

24 tools for Retell AI

These tools are switched on when you connect. You can switch any of them off, or require your approval before it runs.

add_knowledge_base_sourcesChanges dataAdd sources to a knowledge base by knowledge_base_id: knowledge_base_urls (web pages) and/or knowledge_base_texts (title and text).
create_contactChanges dataCreate a contact with phone_number (required), first_name, last_name, contact_tags, custom_fields and do_not_call.
create_phone_callChanges dataStart an outbound phone call from one of your Retell numbers (from_number) to to_number, in E.164 format. The call is placed immediately by the agent bound to from_number, or override_agent_id; pass retell_llm_dynamic_variables to personalize it.
end_callChanges dataEnd an ongoing call immediately by call_id.
find_contact_by_phoneLook up a contact by phone_number (E.164).
get_agentGet one voice agent by agent_id (optionally a specific version), including voice, response engine and settings.
get_callGet one call by call_id, including transcript, recording URL, duration, status, call analysis and cost.
get_call_concurrencyGet the account's current and maximum number of simultaneous calls.
get_chatGet one chat or SMS conversation by chat_id, including its messages and analysis.
get_contactGet one contact by contact_id.
get_knowledge_baseGet one knowledge base by knowledge_base_id, including its sources and status.
get_phone_numberGet one phone number's settings by phone_number (E.164).
list_agentsChanges dataList voice agents, with their IDs, names and versions.
list_callsChanges dataList phone and web calls with filter_criteria (e.g. by agent, call status, date range) and limit. Use to find a call_id.
list_chatsChanges dataList chat and SMS conversations with filter_criteria and limit. Use to find a chat_id.
list_contact_conversationsList the calls and chats held with one contact by contact_id.
list_contactsChanges dataList or search contacts with search_query, filter_criteria and limit.
list_knowledge_basesList knowledge bases that agents use to answer questions.
list_phone_numbersList the phone numbers on the account and which inbound and outbound agents each one uses.
list_voicesList available voices with their voice IDs, provider, gender and accent.
send_sms_chatVisible to othersStart an SMS conversation from one of your Retell numbers (from_number) to to_number, run by the number's SMS agent or override_agent_id. This sends a real text message.
update_callChanges dataUpdate a call's metadata or custom_attributes by call_id.
update_contactChanges dataUpdate a contact by contact_id: name, contact_tags, custom_fields or do_not_call.
update_phone_numberChanges dataChange a phone number's nickname or which agents handle it (inbound_agents, outbound_agents) by phone_number.

Set up in three steps

1
Pick the app
Create a free PipMCP account and choose Retell AI from the app list.
2
Paste your key
Paste a Retell AI API key. In the Retell AI dashboard (dashboard.retellai.com), open the API Keys tab and create or copy a key.
3
Add the link to your AI
You get a personal MCP link. Add it to Claude, ChatGPT or Cursor:
Click your name, then Settings › Connectors › Add custom connector. Paste your link as the Remote MCP server URL. Switch it on from the + menu in a chat.

Questions

What can the AI do in Retell AI?

The AI can read calls, chats, voice agents, voices, knowledge bases, phone numbers, contacts and your call concurrency. It can start outbound phone calls and SMS chats, end an ongoing call, update call metadata, add sources to a knowledge base, change a number's nickname or agents, and create and update contacts.

Does the AI see my Retell AI API key?

No. Your Retell AI API key is encrypted at rest and never shown to the AI. After you save it, it is not shown again, not even to you. The AI only sees the results of the tools it calls.

Can I control what the AI is allowed to do?

Yes. You choose which tools are switched on, so you can start by only reading calls and transcripts. Starting a phone call or an SMS chat reaches a real person right away, and these tools can require your approval before they run. Every tool call is logged.

Does it work with ChatGPT?

Yes. In ChatGPT go to Settings › Apps & Connectors › Advanced and turn on Developer mode, then add your PipMCP link. Developer mode needs a paid ChatGPT plan: Plus, Pro, Business or Enterprise. The same link also works in Claude (Settings › Connectors › Add custom connector), Cursor and other MCP clients.

What does it cost?

PipMCP has a free plan with no credit card required. Paid plans bill per completed task. You also need your own Retell AI account.

Which number and agent does an outbound call use?

You choose the from_number, which must be one of your Retell numbers. The call is run by the agent bound to that number, unless you pass another agent ID. Numbers are in E.164 format, like +4512345678.