---
ref: tool:klaviyo/send-campaign
name: Send a campaign
company: company:klaviyo
workflows: []
access: [mcp, cli, api]
tags: [capability:send-email, category:email, has:api, has:cli, has:mcp]
docs: https://developers.klaviyo.com/en/reference/send_campaign
updated: 2026-09-27
---

# 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.

```json
{ "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.

```sh
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.