Migrating From Customer IO

PostHog imports Customer.io automations as draft workflows. Drafts never send. A person reviews each one, fixes what the import could not carry over, and enables it.

You move the data between two MCP servers. Read from Customer.io’s MCP (or the cio CLI), and pass what it returns unchanged to PostHog’s workflows-import-customerio. PostHog does the translation, so do not rebuild workflows yourself with workflows-create.

Never move people

Pass automations, templates, sender identities and segment names only. Never fetch or pass customer profiles, segment members, deliveries or event data. The people are usually in PostHog already, and copying them is a privacy risk the user did not ask for.

Keep message content out of your context

Email templates are large, often tens of kilobytes of HTML each. When the PostHog project stored a Customer.io App API key (teams that ran the opt-out import have one), PostHog reads the message content from Customer.io itself. So pass the automation graph first, and read templates only if PostHog asks for them.

Steps

1. Confirm the PostHog project. The drafts go into the PostHog MCP’s active project. Read it with project-get, tell the user its name and id, and ask whether the drafts should go there. If not, switch with switch-project before you read anything from Customer.io.
2. Find the environment. Ask which Customer.io workspace to migrate if there is more than one. Its id is the environment_id in every path below.
3. List the automations. GET /v1/environments/{environment_id}/campaigns with the Customer.io read tool (cio_read_api on the MCP, cio api on the CLI). It returns 20 per page through page (0-based): read every page until one returns fewer than 20. Show the user the list with each automation’s state, and ask which to move. Running automations are the usual answer; skip archived ones unless asked.
4. Read each automation. GET /v1/environments/{environment_id}/campaigns/{campaign_id}. Keep the response’s campaign object and its top-level actions array. campaign.actions does not exist.
5. Read senders and segments. GET /v1/environments/{environment_id}/identities?type=email for sender_identities (id, email, name), and the segment list for segments (id, name, type only). PostHog matches each email to the PostHog sender with the same address, and names the segments in its notes.
6. Preview without templates. Call workflows-import-customerio with source: "customerio", dry_run: true, campaigns: [{campaign, actions}], sender_identities and segments. Up to 50 automations per call.
7. Read templates only if needed. Go by each automation’s notes, not by content_fetched alone: true only means PostHog read some content, and one automation can still miss its messages. For every automation whose notes say message content was not part of the import, or that PostHog could not read its messages, read the template of every action that has a template_id with GET /v1/environments/{environment_id}/templates/{template_id}, keep the template object, and preview again with campaigns: [{campaign, actions, templates}]. Read templates one at a time: listing every template in the workspace times out on large ones. Tell the user that Import from Customer.io on the Workflows Opt-outs tab stores their App API key, which skips this step next time.
8. Collect snippets and layouts. If a note names a Customer.io snippet, or a template body you read contains {{ snippets.name }}, read the workspace snippets and pass them as snippets ({name: content}). When PostHog read the content itself, it read the snippets too, and a note names any it could not find. If a note names a layout, read GET /v1/environments/{environment_id}/layouts/{layout_id} and pass its body as layouts ({layout_id: body}).
9. Report the preview. For each automation, give its status and its notes, grouped by level (see below). Ask before importing anything with status failed; its validation_errors say why the draft would be rejected.
10. Import. Call again with dry_run: false and the same arguments. Share each draft’s link (/workflows/{workflow_id}) and the needs_input notes again, since the team must handle those before enabling.

When you are unsure of an endpoint’s parameters, ask for that one endpoint’s schema (cio_schema with resource.method). A whole resource’s schema costs tens of thousands of tokens.

Reading the notes

The same notes appear in the PostHog app on the imported workflow, and workflows-import-notes returns them for one workflow.

Senders and categories

An email gets the PostHog email sender with the same address as its Customer.io sender. When no PostHog sender has that address, a needs_input note names it, so the user can add it as a sender. An email’s subscription topic, or the automation’s topic when the email has none, becomes the PostHog message category the opt-out import made from that topic. When the topics were not imported, a note says so.

Images

The import copies email images hosted by Customer.io into the project’s media library, so they keep loading after the Customer.io account closes. That needs the uploaded_media:write scope. If a note says images still load from Customer.io’s servers, ask the user to reconnect the PostHog MCP and allow uploading media, then import again.

Segments and cohorts

Customer.io segments do not import. An automation triggered by a segment imports with an empty trigger and a needs_input note. If the user already has a PostHog cohort that matches a segment, pass segment_cohorts: {"<segment id>": <cohort id>} and the import uses it for that segment’s triggers and conditions. A cohort trigger needs a realtime cohort. A static segment gets its own note: workflows cannot check a static cohort, so the user rebuilds it as conditions.

Push notifications

Push steps import as unsupported notes, and device tokens never move with the import. If the user sends push from Customer.io, tell them that a device reaches PostHog only when its app registers it with the PostHog SDK, or when they import their exported device tokens into a PostHog push channel. That token import is a separate step the user starts, because tokens are people data.

Re-running

Importing an automation again replaces its draft, so you can re-run after fixing something in Customer.io. Edits the team made to that draft since are lost, so ask before you re-import. A workflow that someone already enabled, or that the user can’t edit, is never changed: its result is skipped.

After the import

Do not enable the drafts. Point the user at the needs_input notes, then hand over to the building-workflows skill for testing and enabling, which needs the user’s explicit sign-off.