Brevo | ElevenLabs Documentation

Your receptionist can send a caller a text message through Brevo, for example your address or a summary of what was agreed on the call. A webhook tool sends the SMS. To look up and save contacts, connect Brevo’s MCP server.

Only text callers who ask for a message or agree to one on the call, and keep these messages transactional: no promotions. Marketing texts need prior consent and an opt-out under rules such as the TCPA in the US and GDPR in the EU. Check what applies to your business before you turn this on.

Send a follow-up text

Prepare your Brevo account

SMS uses prepaid credits. In Brevo, buy SMS credits and check that SMS sending is available for the countries you text. Some countries, such as the US and Canada, don’t accept a custom sender name.

Create an API key

In Brevo, open SMTP & API → API Keys and select Generate a new API key. Leave Create MCP server API key off for this key. Copy the key, which starts with xkeysib-.

Create the webhook tool

Go to Integrations, select Add integration, and choose Webhook Tool.

Field	Value
Name	`send_followup_text`
Description	”Send the caller a text message. Only use it after the caller asks for a text or agrees to receive one. Never send promotions.”
Method	POST
URL	`https://api.brevo.com/v3/transactionalSMS/send`
Request Headers	`api-key`: your API key `accept`: `application/json`
Body Parameters	`sender` (string, required): “Always the exact value `YOUR_SENDER`.” `recipient` (string, required): “The caller’s mobile number with country code, digits only, without `+` or spaces. For example 14155550123.” `content` (string, required): “The text message, under 160 characters. Start with the business name.” `type` (string, required): “Always the exact value `transactional`.”
Assign to agents	Receptionist

Replace YOUR_SENDER with your sender name (up to 11 letters and digits) or sending number (up to 15 digits).

Test it

Select Enable, then test your receptionist by asking for your address by text, using your own mobile number. You can check delivery in Brevo’s SMS logs.

Messages over 160 characters are sent as several texts, and each uses credits.

Look up and save contacts

Create an MCP key

In Brevo, open SMTP & API → API Keys, select Generate a new API key, and turn on Create MCP server API key. Copy the key.

An MCP key has full read and write access to your Brevo account. Keep it separate from the SMS key, and connect only the contacts module below.

Add the MCP server

In Reception.ai, go to Integrations, select Add integration, and choose MCP Server.

Field	Value
Name	Brevo contacts
Server type	Streamable HTTP
Server URL	`https://mcp.brevo.com/v1/brevo_contacts/mcp`
Secret Token	Your MCP key

Select Enable. Reception.ai sends the key as a bearer token and lists Brevo’s contact tools.

Assign tools

Open the Tools tab. Assign the tools that look up and create contacts to the Client (receptionist). Leave tools that delete contacts or change lists unassigned, or assign them only to the Assistant.

https://mcp.brevo.com/v1/brevo/mcp exposes every Brevo module, including email campaigns. Use it only if you want your team to manage campaigns from the Assistant.

Troubleshooting

Problem	What to check
Brevo returns 401	The header must be named `api-key`. If Brevo mentions an unrecognized IP address, check the authorized IPs in Brevo’s security settings.
Brevo returns 400	Check the number has its country code and no `+`, and that the sender name is at most 11 characters.
The text never arrives	Check your SMS credits and whether Brevo can send SMS to that country with your sender.
No MCP tools are listed	Use Streamable HTTP, and an MCP key, not the SMS key.
You changed the MCP key	Edit the integration and use Rotate Secret Token (optional). The saved token is never shown again.