Twenty released SDK v2.54.0 for app developers, and it includes three breaking changes. The permission flags CONNECTED_ACCOUNTS and APPLICATIONS are renamed to USER_APPS and WORKSPACE_APPS. Stored identifiers stay the same, so only the names in manifests change.
MarketplaceApp.isVetted is replaced by isListed. The IS_MESSAGE_CAMPAIGN_ENABLED flag is removed because campaigns are now on for every workspace.
Apps can declare MCP servers in their manifest with defineMcpServer. Two new helpers, attachRecordToInboxThread and detachRecordFromInboxThread, let apps and workspace members link records to inbox threads.