--- title: "Connect Call Loop 2.0 to Retell AI - APIANT.ai" description: "When \"Contact Added to List\" fires in Call Loop 2.0, your agent runs \"Add Agent\" in Retell AI." canonical: "https://apiant.ai/connect/call-loop-2-0-to-retell-ai" --- # Connect Call Loop 2.0 to Retell AI When **Contact Added to List** fires in [Call Loop 2.0](https://apiant.ai/connections/call-loop-2-0), your agent runs **Add Agent** in [Retell AI](https://apiant.ai/connections/retell-ai). Describe the whole flow and it is built, tested on every scenario and kept running. Call Loop 2.0 **2** triggers Call Loop 2.0 **13** actions Retell AI **27** actions What the catalog holds today. Ask for anything missing and your agent reads the API documentation and adds it. ## What do you want Call Loop 2.0 and Retell AI to do together? Give your AI client this address. `https://mcp.apiant.ai` One connection does both: ask your client to act in an app once, or have it build an automation that keeps running. Any client that takes a remote MCP server. Nothing to install. Create your free account, then sign in once in your browser. ### Set it up in your client ### Claude Code Run this in the directory you want to work in. `claude mcp add --transport http -s project apiant-ai https://mcp.apiant.ai` Start Claude Code there, approve the server, and sign in in the browser page it opens. [Claude Code guide (opens in a new tab)](https://apiant.ai/docs/mcp/claude-code) ### Claude, web and desktop Open Customize, then Connectors, then Add custom connector, and paste the address. On Team and Enterprise an owner adds it first. [Setup guide (opens in a new tab)](https://apiant.ai/docs/mcp) ### Cursor Add the address to your MCP configuration as a server URL. Cursor signs you in in your browser. [Setup guide (opens in a new tab)](https://apiant.ai/docs/mcp) ### Zed Open Settings, then AI, then MCP Servers, then Add Server, then Add Remote Server. [Setup guide (opens in a new tab)](https://apiant.ai/docs/mcp) ### Codex and the ChatGPT desktop app Open Settings, then MCP servers, then Add server, and choose Streamable HTTP. From the terminal, Codex takes the address with its own add command and then signs you in. [Setup guide (opens in a new tab)](https://apiant.ai/docs/mcp) ### Any other MCP client Paste the address where the client asks for a remote MCP server URL, and name the server apiant-ai where it lets you. APIANT's skills reach the client over the same connection. [Setup guide (opens in a new tab)](https://apiant.ai/docs/mcp) Example flows ## What Call Loop 2.0 can start in Retell AI - When **Contact Added to List** in Call Loop 2.0 then **Add Agent** in Retell AI - When **Contact Created or Updated** in Call Loop 2.0 then **Create Knowledge Base** in Retell AI Starting points drawn from the triggers and actions in the catalog today. Describe the flow you need, at any depth, and your agent builds it and tests every scenario before it ships. Everything your agent can do with Call Loop 2.0 and Retell AI ## Triggers and actions 2 triggers · 40 actions - Trigger **Contact Added to List** Triggers when a contact is added to the selected Call Loop list. - Trigger **Contact Created or Updated** Triggers when a contact is created or updated in Call Loop. - Action **Add list** Creates a new contact list in Call Loop and returns the created list. - Action **Create (Update) Contact** Creates a contact, or updates the existing contact with the same phone number, and returns the saved contact. - Action **Delete contact** Permanently deletes one or more contacts by ID and returns a confirmation with the number deleted. - Action **Find contacts by search term** Returns the Call Loop contacts that match a search term, optionally narrowed by status and subscription state. - Action **Get contact** Returns one Call Loop contact by its ID, including its status, subscription state, lists, custom field values and messaging activity. An error occurs if the contact is not found. - Action **Get message** Returns a message's current delivery status and details, looked up by its ID or state UUID. An error occurs if the message is not found. - Action **List contacts** Returns the contacts in your Call Loop organization, optionally filtered by status, search text or subscription state. Deleted contacts are not included. - Action **Send Ringless Voicemail** Queues a ringless voicemail drop to a phone number using an audio file already in your Call Loop account. Returns the queued message and its delivery state. - Action **Send SMS / MMS Message** Queues one SMS or MMS message to a phone number from a number on your Call Loop account, and returns the queued message with its status. - Action **Send Voice Broadcast** Queues one outbound voice call to a phone number, playing an uploaded audio file on live answer, as a voicemail, or both. Returns the queued message and its status. - Action **Update contact** Updates an existing Call Loop contact by ID, changing only the fields you fill in, and returns the saved contact. - Action **Update list** Renames an existing contact list and returns the updated list. - Action **Update Opt-In Status** Sets whether one contact is subscribed to text messages and to calls and ringless voicemail. No message is sent. - Action **Add Agent** Create a new Retell AI voice agent attached to a response engine (Retell LLM, custom LLM, or conversation flow) and a voice. - Action **Create Knowledge Base** Create a new Retell AI knowledge base from texts, URLs and/or a file. - Action **Create Retell LLM** Create a new Retell LLM Response Engine that can be attached to an agent. This is used to generate response output for the agent. - Action **Delete Agent** Deletes an existing Retell AI agent, including all of its versions. - Action **Delete Knowledge Base** Delete an existing knowledge base. - Action **Delete Phone Number** Delete a phone number from your Retell AI account. - Action **Delete Retell LLM** Delete a Retell LLM response engine. - Action **Get a Call** Retrieves the full details of a Retell AI call (phone or web): status, transcript, recording links, post-call analysis, cost and latency. - Action **Get an Agent** Retrieve the full configuration of a Retell AI voice agent. - Action **Get a Phone Number** Retrieve the details of one phone number in your Retell AI account, including its bound agents, nickname and webhook settings. - Action **Get a Retell LLM** Retrieve the details of a Retell LLM response engine, including its prompt, model, tools and states. - Action **Get a Voice** Retrieve the details of a single Retell AI voice: its name, provider, accent, gender, age and a preview audio link. - Action **Get Concurrency** Gets your Retell AI organization's current number of ongoing calls and its concurrency limits. - Action **Get Knowledge Base** Retrieve the details of a knowledge base, including its processing status and sources. - Action **Import Phone Number** Import a phone number from your own telephony provider (for example a Twilio elastic SIP trunk) into Retell AI and optionally bind agents to it. - Action **List Agents** Lists the voice and chat agents in the Retell AI account, optionally filtered by channel or by a name/id search. - Action **List Calls** List calls in the Retell AI account, newest first by default, optionally filtered by agent, status, direction, numbers, time range and more. Returns up to 1000 calls; transcripts and recording URLs are not included (use Get a Call for those). - Action **List Knowledge Bases** List all knowledge bases in the Retell AI account. - Action **List Phone Numbers** Lists the phone numbers in your Retell AI account (up to 1000). - Action **List Retell LLMs** Lists the Retell LLM response engines in the account. - Action **List Voices** List all voices available to the Retell AI account. - Action **Make a Phone Call** Start a new outbound phone call from one of your Retell numbers, handled by a Retell voice agent. - Action **Register Phone Call** Register a phone call placed through your own (custom) telephony, so Retell issues a call id your telephony can connect the audio to. - Action **Update Agent** Updates an existing Retell AI voice agent's latest draft version. Only the fields you fill in are changed. - Action **Update Call** Update the metadata, data storage setting or custom attributes of an existing Retell AI call. - Action **Update Phone Number** Updates the agents, nickname, webhooks, country restrictions, SIP trunk and fallback settings of a phone number in Retell AI. Only the fields you fill in are changed. - Action **Update Retell LLM** Update an existing Retell LLM response engine's configuration (prompt, model, etc). ## Each app on its own - [ **Call Loop 2.0** Call Loop is an all-in-one SMS Texting, Voice Broadcasts, & Ringless Voicemail platform.](https://apiant.ai/connections/call-loop-2-0) - [ **Retell AI** Retell AI is a conversation intelligence platform that turns customer calls into actionable insights.](https://apiant.ai/connections/retell-ai) Reviews ## What our customers say ## More from Call Loop 2.0 - [ **Call Loop 2.0 to HubSpot** HubSpot is your all-in-one stop for all of your marketing software needs.](https://apiant.ai/connect/call-loop-2-0-to-hubspot) - [ **Call Loop 2.0 to Salesforce** Salesforce is a leading enterprise customer relationship management (CRM) platform.](https://apiant.ai/connect/call-loop-2-0-to-salesforce) - [ **Call Loop 2.0 to Slack** Slack is a messaging platform for teams. Post messages, manage channels, users, reminders, and react to...](https://apiant.ai/connect/call-loop-2-0-to-slack) - [ **Call Loop 2.0 to Google Sheets** Google Sheets is Google's online spreadsheet app for creating, editing and sharing spreadsheets.](https://apiant.ai/connect/call-loop-2-0-to-google-sheets) - [ **Call Loop 2.0 to Gmail** Gmail is Google’s email service, featuring spam protection, search functions, and seamless integration with...](https://apiant.ai/connect/call-loop-2-0-to-gmail) - [ **Call Loop 2.0 to Google Calendar** Google Calendar is a time management tool providing scheduling features, event reminders, and integration...](https://apiant.ai/connect/call-loop-2-0-to-google-calendar) ## More into Retell AI - [ **HubSpot to Retell AI** HubSpot is your all-in-one stop for all of your marketing software needs.](https://apiant.ai/connect/hubspot-to-retell-ai) - [ **Salesforce to Retell AI** Salesforce is a leading enterprise customer relationship management (CRM) platform.](https://apiant.ai/connect/salesforce-to-retell-ai) - [ **Slack to Retell AI** Slack is a messaging platform for teams. Post messages, manage channels, users, reminders, and react to...](https://apiant.ai/connect/slack-to-retell-ai) - [ **Google Sheets to Retell AI** Google Sheets is Google's online spreadsheet app for creating, editing and sharing spreadsheets.](https://apiant.ai/connect/google-sheets-to-retell-ai) - [ **Gmail to Retell AI** Gmail is Google’s email service, featuring spam protection, search functions, and seamless integration with...](https://apiant.ai/connect/gmail-to-retell-ai) - [ **Google Calendar to Retell AI** Google Calendar is a time management tool providing scheduling features, event reminders, and integration...](https://apiant.ai/connect/google-calendar-to-retell-ai) Questions ## Call Loop 2.0 and Retell AI, answered ### ### What can start an automation from Call Loop 2.0? Any of Call Loop 2.0's 2 triggers in the catalog, including Contact Added to List and Contact Created or Updated. Describe the moment in plain language and your agent picks the right one. ### ### What can your agent do in Retell AI when something happens in Call Loop 2.0? Any of Retell AI's 27 actions, including Create Knowledge Base, Create Retell LLM, Update Agent and Update Call. Your agent maps the data both ways and tests every scenario before it ships. ### ### Can it also run from Retell AI to Call Loop 2.0? Retell AI has no triggers in the catalog today, so automations start in Call Loop 2.0. If you need the other direction, ask: your agent reads Retell AI's API documentation and adds it. ### ### Do I have to build a connector for Call Loop 2.0 or Retell AI? No. Both are in the catalog with their triggers and actions. You describe the automation; your agent builds it, tests every scenario and keeps it running. ### ### Can my AI client use Call Loop 2.0 and Retell AI without building an automation? Yes. With your AI client connected to APIANT, ask it to do something in either app once and it runs that action on the spot. Ask for an automation and your agent builds it, tests every scenario and keeps it running. One connection covers both. ### ### What happens when something fails? Your agent works that out for you. It plans the failure paths along with the happy path, then tests every scenario before it ships. ### ### Is there a free plan? Yes. Every plan includes the agent, including free, and building from your own AI client spends no assistant credits.