Retell AI

Check if an agent is deployed to any phone numbers. Returns the agent's inbound and outbound phone number assignments, and whether the agent is currently active for receiving or making calls

Check if the current user session has a valid authentication token stored.

Check if a workspace has been selected by the user

Create a Retell AI agent with configuration

Deploy a voice agent

Edit an agent's name and/or language. Ask the user which agent they want to edit and what changes they'd like to make. Gather the agent ID and at least one of: new name or new language. Invoke this tool whenever the user wants to change the agent's language and/or name.

Edit an agent's Cal.com integration which allows the user to book calendar events. Ask the user which agent they want to edit and what changes they'd like to make. Gather the agent ID, the Cal.com API Key, the event type ID, the timezone, and the description (optional).

Edit an agent's end_call function. Ask the user which agent they want to edit and what changes they'd like to make. Gather the agent ID and the description/condition for when to end the call.

Edit an agent's transfer_call function. Ask the user which agent they want to edit and what changes they'd like to make. Gather the agent ID, the condition for transferring the call, the phone number to transfer the call to, and the transfer type cold/warm.

Update the agent's voice.

Generate agent prompt from configuration

Send a message to the agent in the playground for testing

Get available phone numbers for the session

List the user's workspaces from Retell

Start a phone call with the agent for testing

Get list of all agents in the workspace

Show all available voices for the agent. User can browse and preview voices before selecting one. After showing this, tell the user: 'Here are the available voices. Feel free to preview and listen to them, then let me know which voice you'd like to use for your agent.'

Generate a preview of modified prompt based on user's change description. Shows diff between original and modified prompt. User can then review and decide to apply or refine further.

Refine agent prompt based on change description (internal widget use)

Save bearer token for agent testing

Save selected workspace

Returns an email containing a link to the Retell AI dashboard phone numbers page.

Use this widget when the user asks to create or build an agent. Before calling this tool, ask the user for all required fields (name, description, use cases, audience, tone, style, language), using sensible defaults for optional fields.

When calling or re-calling this tool, ALWAYS include all previously collected values along with any newly updated field. Treat prior widget state as the source of truth and re-emit it in the tool input.

If the user asks to edit a specific field, show this widget again with the updated value merged into the previous inputs.

Invoke this tool to deploy an agent to a phone number. The agent must already be created. This tool will show a widget where the user can select a phone number and deploy their agent.

Display all agents in the current workspace. Shows agent details including names, IDs, voices, and languages.

Use this tool to interactively test and evaluate a Retell AI voice agent. It provides a built-in chat interface for real-time text conversations with the agent, as well as the ability to initiate test phone calls to validate voice behavior, conversation flow, and agent responses. This tool is intended for debugging, quality assurance, and behavior validation of Retell AI agents. The user would usually want to test an agent after they have created or deployed one.

Display a select input of the user's RetellAI workspaces to allow for modification of selected workspace. Only show when user asked to modify the selected workspace.

Update agent prompt in Retell and database (internal widget use)