channel_marked event | Slack Developer Docs reference Skip to main content Guides Reference Samples Tools Changelog Dev Program MANAGE APPS * Reference * App manifest * Block Kit * Events * Overview * accounts_changed * agent_session_stopped * agent_session_title_changed * app_context_changed * app_deleted * app_home_opened * app_installed * app_mention * app_rate_limited * app_requested * app_uninstalled_team * app_uninstalled * assistant_thread_context_changed * assistant_thread_started * bot_added * bot_changed * call_rejected * channel_archive * channel_created * channel_deleted * channel_history_changed * channel_id_changed * channel_joined * channel_left * channel_marked * channel_rename * channel_shared * channel_unarchive * channel_unshared * commands_changed * dnd_updated_user * dnd_updated * email_domain_changed * emoji_changed * entity_comments_requested * entity_details_requested * external_org_migration_finished * external_org_migration_started * file_change * file_comment_deleted * file_created * file_deleted * file_public * file_shared * file_unshared * function_executed * goodbye * grid_migration_finished * grid_migration_started * group_archive * group_close * group_deleted * group_history_changed * group_joined * group_left * group_marked * group_open * group_rename * group_unarchive * hello * im_close * im_created * im_history_changed * im_marked * im_open * invite_requested * link_shared * manual_presence_change * member_joined_channel * member_left_channel * message * message_metadata_deleted * message_metadata_posted * message_metadata_updated * message.app_home * message.channels * message.groups * message.im * message.mpim * pin_added * pin_removed * pref_change * presence_change * presence_query * presence_sub * reaction_added * reaction_removed * reconnect_url * shared_channel_invite_accepted * shared_channel_invite_approved * shared_channel_invite_declined * shared_channel_invite_received * shared_channel_invite_requested * star_added * star_removed * subteam_created * subteam_members_changed * subteam_self_added * subteam_self_removed * subteam_updated * team_access_granted * team_access_revoked * team_domain_change * team_join * team_migration_started * team_plan_change * team_pref_change * team_profile_change * team_profile_delete * team_profile_reorder * team_rename * tokens_revoked * url_verification * user_change * user_connection * user_huddle_changed * user_profile_changed * user_status_changed * user_typing * Interaction payloads * Methods * Objects * Scopes * Types * Slack Connect API * Views * * Audit Logs API * Legal Holds API * SCIM API * * Slack Status API * * Events * channel_marked Copy as markdown On this page channel_marked event Your channel read marker was updated Facts Required Scopes No scopes required! Compatible APIs RTM Usage info ​ This example includes both the event wrapper and the event structure for the channel_marked event. { "token" : "XXYYZZ" , "team_id" : "T123ABC456" , "api_app_id" : "A123ABC456" , "event" : { "type" : "channel_marked" , "channel" : "C123ABC456" , "ts" : "1401383885.000061" } , "type" : "event_callback" , "authorizations" : [ { "team_id" : "T123ABC456" , "user_id" : "U123ABC456" , "is_bot" : false , "is_enterprise_install" : false , } ] , "event_id" : "Ev123ABC456" , "event_time" : 123456789 } The channel_marked event is sent to all open connections for a user when that user moves the read cursor in a channel. Previous channel_left Next channel_rename Copy as markdown * Usage info . * Tools * Slack CLI * Bolt frameworks * Slack SDKs * Block Kit Builder * Developer program * Code samples & tutorials * LLM? Read llms.txt * All tools Learn * Learning paths * Workshops * Slack certifications * Trailhead * Resource library * All learning resources Community * Slack community * Slack events Resources * Docs * Blog * Slack marketplace * Developer newsletter Manage Apps * Your apps * Status * Privacy * Terms * Cookie Preferences * Support * Changelog * Your Privacy Choices © 2026 Slack Technologies, LLC, a Salesforce company. All rights reserved. Various trademarks held by their respective owners. * * *