v1.3.0

Added

• slack_stdio_update_message — edit a message the user posted (chat.update)
• slack_stdio_delete_message — delete a message the user posted (chat.delete)
• slack_stdio_remove_reaction — remove a reaction the user added (reactions.remove)
• slack_stdio_scheduled_messages — action=list or action=cancel for scheduled messages

The hosted Slack MCP catalog can send, add reactions, and schedule. These overlay tools cover the gaps using existing user scopes. No generic Web API passthrough.