Send a campaign

Send a campaign

Starts an asynchronous job that sends a campaign to its configured audience.

Note: Sends to real people: confirm the campaign, its audience and its content with the user first. Track the job with get_campaign_send_job and stop it with cancel_campaign_send.

Set up

Use the first option your agent supports.

MCP (official, remote)

Add this server to your agent's MCP settings, then sign in when asked.

{ "mcpServers": { "klaviyo": { "url": "https://mcp.klaviyo.com/mcp" } } }

Call the MCP tool send_campaign.

Server URL: https://mcp.klaviyo.com/mcp

CLI (official)

Install the command, then confirm it runs.

go install github.com/klaviyo/klaviyo-cli/cmd/klaviyo@latest
klaviyo --version

Run klaviyo campaigns send-campaign.

Set $KLAVIYO_API_KEY in your environment first (get a key: https://www.klaviyo.com/create-private-api-key).

API (official)

• Base URL: https://a.klaviyo.com
• Endpoint: POST /api/campaign-send-jobs
• Auth: send the header Authorization: Klaviyo-API-Key $KLAVIYO_API_KEY
• Get a key: https://www.klaviyo.com/create-private-api-key
• Docs: https://developers.klaviyo.com/en/reference/api_overview

Before anything else, confirm access with the cheapest read-only call, like a list or a search. Never send or change anything to test access.

Rules

• Ask the user before anything that sends messages, costs money, or changes data, and say how many records it touches. One approval covers a batch the user has seen.
• Never print API keys.