Retell AI

Update the agent's voice.

edit_agent_voice

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_agent_calcom_function

Generate agent prompt from configuration

generate_prompt

Get available phone numbers for the session

get_phone_numbers

List the user's workspaces from Retell

get_workspaces

Start a phone call with the agent for testing

initiate_call

Get list of all agents in the workspace

list_agents

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

show_list_agents

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.'

list_available_agent_voices

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.

show_workspaces_select

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.

show_agent_creation_widget

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.

preview_agent_prompt_edit

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

refine_prompt

Save bearer token for agent testing

save_bearer_token

Save selected workspace

save_selected_workspace

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

send_dashboard_link

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.

show_test_agent

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

update_agent_prompt