OneSignal MCP

OneSignal's MCP server covers customer messaging end to end from an AI client. Messaging tools send a message, list past messages and view a single message with its delivery statistics, so an agent can both dispatch a campaign and report on how the last one performed. App tools list the applications an account can reach, which scopes everything that follows. The largest group handles audience data: creating and updating users, managing external identities and aliases, and creating or modifying email, SMS and push subscriptions. Template tools list, fetch, create and update message templates. Segment tools do the same for segments, so an agent can define an audience from a described condition and then message it. Two tools start and update iOS Live Activities, and export tools produce subscription and audience activity CSV files for downstream analysis. Custom event tools create events and list event definitions, and analytics and utility tools return outcome data and report on server health and configuration. Installation is available from client marketplaces and connector directories, or by adding the remote MCP URL manually. Authentication uses a browser based OAuth flow, so there is no API key to copy into a config file, store or rotate. It is aimed at product, growth and lifecycle marketing teams already running OneSignal who want to build a segment, draft and send a message, and check delivery outcomes in one conversation instead of moving between the dashboard and a spreadsheet.