How to connect Plain MCP to Claude

Add an AI-generated reply suggestion to a thread.

Add labels to a thread by label type IDs.

Archive a label type to hide it from the active label list.

Assign a thread to a user or machine user.

Bulk upsert (create or update) multiple thread field values in a single operation.

Change the priority of a thread.

Create a new broadcast: a message authored once and posted to many Slack channels at once.

Create a reusable broadcast audience: a named set of broadcast recipients, resolved to concrete Slack channels at send time rather than when saved.

Create a new label type for organizing threads.

Create an internal note on a thread.

Create a new snippet (reusable reply template) in the workspace.

Create a new thread for a customer.

Create a new thread field schema to capture structured data on threads.

Link a thread to an external entity (e.

Connect workspace Slack notifications using a Slack connection the workspace already has.

Soft-delete a broadcast.

Soft-delete a broadcast audience.

Delete a thread field schema from the workspace.

Remove a link between a thread and an external entity.

Generate a short-lived download URL for an attachment on a thread.

Fetch a single broadcast audience by its ID, or null if no audience with that ID exists.

Fetch a paginated list of the workspace's broadcast audiences, newest first.

Fetch a single broadcast by its ID, including its authored content and who it is targeted at.

Fetch a paginated list of the workspace's broadcasts, newest first.

Fetch the individual recipients of one broadcast send — which channel got the message, which did not, and why.

Fetch the send history of one broadcast, newest first.

Fetch detailed information about a specific customer by their ID.

Fetch a paginated list of customers from Plain.

Fetch first 10 threads for a specific customer.

Fetch detailed information for a specific help-center article by ID.

Fetch detailed information for a specific help-center article by slug.

Fetch a paginated list of article groups for a specific help center.

Fetch a paginated list of articles for a specific help center.

Fetch a paginated list of help centers.

Fetch a paginated list of label types from Plain.

Fetch first 10 threads assigned to a specific user in Plain.

Get the currently authenticated user's details.

Get the currently authenticated user's workspace details.

Poll a Sidekick session: read its status, its newest messages, and any approval it is blocked on.

Fetch a single snippet by ID, including soft-deleted snippets (where `isDeleted` is true).

Fetch a paginated list of snippets from the workspace.

Fetch detailed information about a specific tenant by their ID.

Fetch a paginated list of tenants from Plain.

Fetch complete details for a specific thread including first 50 timeline entries.

Fetch a paginated list of thread field schemas from Plain.

Fetch the knowledge sources cited by AI agent replies on a thread.

Fetch threads with flexible filtering options.

Look up a Plain user by their email address.

List Sidekick sessions in the workspace, most recent activity first.

Flag a customer as spam.

Mark a thread as done (resolved).

Mark a thread as todo (reopen or set as active).

Merge one Plain thread into another (a `MERGED_INTO` native thread link).

Move a label type to a different position in the label hierarchy.

Remove labels from a thread by label IDs.

Reorder multiple thread field schemas in a single operation.

Reply to the last message in a thread.

Approve or deny a Sidekick tool-call approval request.

Search broadcasts by name.

Search for customers by name, email, short name, or external ID.

Search for tenants by name or external ID.

Search a connected issue tracker for external entities that can be linked to a thread via `createThreadLink`.

Search threads by text content in title, description, or messages.

Send a follow-up message into an existing Sidekick session.

Send a test copy of a broadcast to Slack channels you name, so you can see what recipients will get before the real audience does.

Snooze a thread for a specified duration.

Start a new Sidekick session and return the handle used by every other Sidekick tool.

Unarchive a previously archived label type to make it available again.

Unassign a thread, removing the current assignee.

Clear the spam flag from a customer, restoring their threads to the inbox and metrics.

Update one or more fields of an existing broadcast.

Update a broadcast audience's name, filters, or both.

Update an existing label type's properties.

Update an existing thread field schema's properties.

Update the title (subject line) of an existing thread.

Create or update a customer.

Create or update a help-center article.

Create or update a tenant.

Create or update a tenant field.

Upsert (create or update) a thread field value on a thread.