# Customer.io Documentation

> Customer.io is a messaging automation platform for sending targeted email, push notifications, SMS, in-app messages, and webhooks based on customer behavior and data attributes. These docs cover setup, integration, messaging, segmentation, analytics, API reference, and agent-native access through the Customer.io CLI or MCP server.

Customer.io documentation is organized into the following sections. Each section has its own `llms.txt` file with detailed page listings.

## Sections

- [AI features](https://docs.customer.io/ai/llms.txt): AI features documentation (22 pages)
- [Get started](https://docs.customer.io/get-started/llms.txt): Get started documentation (9 pages)
- [Integrations](https://docs.customer.io/integrations/llms.txt): Integrations documentation (763 pages)
- [Messaging](https://docs.customer.io/messaging/llms.txt): Messaging documentation (358 pages)
- [Settings & billing](https://docs.customer.io/accounts/llms.txt): Settings & billing documentation (39 pages)

## Additional resources

- [Customer.io CLI](https://docs.customer.io/ai/cli/get-started.md): Install the `customerio/cli` agent skill and let terminal-based coding agents sign up, authenticate, and manage Customer.io workspaces
- [Customer.io MCP](https://docs.customer.io/ai/mcp/get-started.md): Connect chat-based AI tools like ChatGPT and Claude Desktop to Customer.io
- [Full documentation](https://docs.customer.io/llms-full.txt): Complete text of all documentation pages in a single file
- [Pipelines API spec](https://docs.customer.io/files/pipelines.json): OpenAPI spec for the Data Pipelines API
- [Track API spec](https://docs.customer.io/files/journeys-track.json): OpenAPI spec for the Track API
- [App API spec](https://docs.customer.io/files/journeys-app.json): OpenAPI spec for the App API
- [Webhooks spec](https://docs.customer.io/files/journeys-webhooks.json): OpenAPI spec for reporting webhooks