Retell Ai MCP server

Connect Retell Ai to Claude, ChatGPT, Cursor, Claude Code, Codex, Gemini, GitHub Copilot and any other MCP client, for your whole team. Metorial adds security, governance, and tracing, and gives everyone one Magic MCP URL to connect.

What you can do with the Retell Ai MCP server

Ask your agent in plain language. Each of these maps to a real tool on the server.

  • Use the delete phone number tool in Retell Ai
  • Use the get voice agent tool in Retell Ai
  • Use the create batch call tool in Retell Ai
  • Use the get call tool in Retell Ai
  • Use the make phone call tool in Retell Ai
  • Use the delete voice agent tool in Retell Ai

Supported Tools

delete_phone_number

Delete Phone Number

Delete a phone number from your Retell AI account. This action is irreversible.

get_agent

Get Voice Agent

Retrieve detailed configuration of a specific voice agent by its ID, including voice settings, response engine, language, webhook configuration, and more. Optionally specify a version to retrieve a specific version of the agent.

create_batch_call

Create Batch Call

Create a batch outbound calling campaign to automate large-scale outreach. Specify a source number and a list of tasks (destination numbers) with optional per-call customizations. Campaigns can be scheduled or started immediately.

get_call

Get Call

Retrieve detailed information about a specific call, including transcript, recording URL, call analysis, cost breakdown, latency metrics, and disconnection reason.

make_phone_call

Make Phone Call

Initiate an outbound phone call. Specify the source number (must be owned/imported in Retell) and destination number. Optionally override the agent, inject dynamic variables, or attach metadata.

delete_agent

Delete Voice Agent

Delete a voice agent and all of its versions. This action is irreversible.

create_web_call

Create Web Call

Initiate a browser-based voice call via WebRTC. Returns an access token that can be used by the frontend to join the call room. No telephony infrastructure required.

get_concurrency

Get Concurrency

Check your current call concurrency usage, limits, and purchasing capacity. Useful for monitoring capacity before launching batch campaigns.

list_calls

List Calls

List and filter calls in your Retell AI account. Filter by agent, status, type, direction, sentiment, date range, and more. Supports pagination and sorting.

list_phone_numbers

List Phone Numbers

List all phone numbers in your Retell AI account, including their assigned agents, type, and configuration.

list_knowledge_bases

List Knowledge Bases

List all knowledge bases in your Retell AI account, including their status, sources, and configuration.

purchase_phone_number

Purchase Phone Number

Purchase a new phone number from Retell. Specify an area code and optionally assign inbound/outbound agents.

get_knowledge_base

Get Knowledge Base

Retrieve detailed information about a specific knowledge base, including its sources and processing status.

update_agent

Update Voice Agent

Update the configuration of an existing voice agent. You can modify voice settings, language, webhooks, behavioral parameters, response engine, and more. Only provided fields will be updated.

create_agent

Create Voice Agent

Create a new voice agent with a specified voice and response engine configuration. Agents can be configured with various voice settings, language, webhooks, and behavioral parameters.

list_voices

List Voices

Browse available voices for Retell AI agents. Returns all voices with their provider, gender, accent, and preview audio. Use to find the right voice ID when creating or updating agents.

get_phone_number

Get Phone Number

Retrieve details of a specific phone number, including assigned agents, webhooks, and country restrictions.

delete_knowledge_base

Delete Knowledge Base

Delete a knowledge base from your Retell AI account. This action is irreversible.

delete_call

Delete Call

Delete a call record from your Retell AI account. This action is irreversible.

list_agents

List Voice Agents

List voice agents in your Retell AI account. Returns unique voice agent IDs, names, and environment tags. Use get_agent for version configuration. Supports pagination for large collections.

update_phone_number

Update Phone Number

Update configuration of an existing phone number, including assigned agents, webhooks, and country restrictions.

delete_retell_llm

Delete Retell LLM

Delete an unused response engine. Delete or detach agents that reference it first; Retell rejects deletion while it is in use.

update_retell_llm

Update Retell LLM

Update the latest draft or an explicitly selected response-engine version. Only supplied settings are changed.

list_retell_llms

List Retell LLMs

Discover prompt-based response engines and their IDs for create_agent or update_agent. Supports cursor pagination.

create_retell_llm

Create Retell LLM

Create a prompt-based Retell response engine. Pass its llmId to create_agent with responseEngine type retell-llm.

create_knowledge_base

Create Knowledge Base

Create a knowledge base from text and public URLs for an agent response engine. Indexing is asynchronous; use get_knowledge_base to check status.

get_retell_llm

Get Retell LLM

Read a response engine and its prompt, model, and knowledge-base configuration.

download_call_recording

Download Call Recording

Prepare a downloadable WAV recording for a completed call. Choose the standard, multichannel, or PII-scrubbed recording when available.

publish_agent

Publish Voice Agent

Publish an existing draft version in place so it can serve production calls. Publishing does not create another draft version.

Connect Retell Ai to your AI client

Every client uses the same Magic MCP URL, and so does any other MCP client. Add it once and sign in with SSO.

  1. Enable Retell Ai in Metorial. In your Metorial portal, enable the Retell Ai MCP server and sign in with the account that owns the data. Access stays governed by your team policies.
  2. Add a custom connector. Open Customize, then Connectors. Select Add, then Custom, then Web.
  3. Paste your Metorial MCP URL. Name it Metorial, paste your Magic MCP URL (<your-magic-mcp-url>) and continue.
  4. Sign in. Select Add and sign in to load Retell Ai tools.

Run Retell Ai through the Metorial gateway

One governed layer for every app your agents reach, not a separate connector per tool.

  • Give Retell Ai and every other app to your whole team through one MCP gateway, behind your SSO.
  • Scope which teams and agents can use Retell Ai tools with role-based access control, and trace every call.
  • Prefer to run it yourself? Metorial is open source and self-hostable.

More integrations teams use with Retell Ai

GitHub

Manage repositories, issues, and pull requests. Create and configure branches, star repositories, review code, and merge changes. Automate CI/CD workflows with GitHub Actions, manage workflow runs, secrets, and artifacts. Track issues with labels, milestones, and assignees. Search across code, repositories, issues, and users. Manage organizations, teams, and memberships. Create and manage projects, gists, packages, deployments, and environments. Access security alerts including code scanning, secret scanning, and Dependabot alerts. Read and write file contents in repositories. Manage webhooks, notifications, and codespaces.

Slack

Slack: connect with bot OAuth or user OAuth to work with messages, conversations, search, files, Canvases, Lists, profiles, reactions, reminders, and workspace productivity settings.

Salesforce

Manage CRM data including Accounts, Contacts, Leads, Opportunities, Cases, and custom objects. Create, read, update, and delete records. Query data using SOQL and search across objects using SOSL. Perform bulk data operations for large-scale imports, exports, and migrations. Execute composite requests to batch multiple operations in a single API call. Access analytics, reports, and dashboards. Manage files and attachments associated with records. Interact with Chatter feeds, posts, and groups for social collaboration. Manage org metadata including custom objects, fields, layouts, and workflows. Query data using GraphQL for precise data retrieval across related objects.

Sharepoint

Manage SharePoint sites, document libraries, lists, and files. Create, read, update, and delete lists and list items with custom columns. Resolve site users to numeric Person/Group LookupId values. Upload, download, move, copy, and version files in document libraries. Search across sites, files, folders, lists, and list items using Microsoft Search. Manage permissions at site, list, and item levels with granular access control. Define and manage content types and site columns. Retrieve site properties and search for sites across Microsoft 365.

Microsoft Outlook

Send, read, reply to, forward, and manage email messages in user mailboxes. Organize messages into folders, apply categories, flags, and importance levels. Manage file and item attachments. Create, update, delete, and respond to calendar events and meetings. Find available meeting times, manage attendees, handle recurrence, and work with shared or delegated calendars. Create, read, update, and delete contacts, organize them into contact folders, and manage contact photos. Manage tasks and task lists via Microsoft To Do, including due dates, reminders, recurrence, and checklist items. Subscribe to webhook notifications for changes to messages, calendar events, and contacts. Support for Focused Inbox, @-mentions, mail tips, send-on-behalf, and send-as capabilities.

Airtable

Create, read, update, and delete records in Airtable bases and tables. Manage base schemas including creating tables and fields. Filter records using formulas, sort by fields, and scope queries to specific views. Upsert records to find, create, or update in a single call. Upload attachments to records, read and write record comments, list accessible bases, and receive real-time base change events through webhooks.

Technical notes for Retell Ai

Build and manage Retell AI voice agents and prompt-based response engines. Create browser voice calls, initiate outbound phone calls and batch campaigns, configure phone numbers, create knowledge bases from text or URLs, browse voices, and inspect call transcripts, recordings, analysis, costs, and concurrency. Download completed call recordings.

Frequently asked questions

Common questions about connecting Retell Ai to AI agents with Metorial.

  1. How many tools does the Retell Ai MCP server have?
    The Retell Ai MCP server exposes 29 tools, including Delete Phone Number, Get Voice Agent, Create Batch Call. Each one is governed and traced through Metorial.
  2. Retell Ai exposes tools your agents call on demand; it does not publish event triggers yet. Everything still runs through one governed MCP URL.
  3. Any MCP client, including VS Code, Windsurf, Zed, OpenCode and Grok. Each one reaches the Retell Ai MCP server through the same Metorial URL.
  4. Use role-based access control to decide which teams, users, and agents can use Retell Ai and which of its tools they can call.
  5. Yes. Metorial is open source, so you can run the Retell Ai MCP server yourself or use the hosted gateway.

Connect Retell Ai to production AI agents

See how Metorial gives your team governed access to Retell Ai, with tracing and security controls built in.