Open source alternatives to slack

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slack

Slack messaging workflows through OpenClaw's message tool

slack is an agent skill from the OpenClaw project, listed on skills.sh. It guides an OpenClaw agent through Slack with its message tool: sending to channels or people, replying in threads, editing, deleting, pinning and reacting. It uses stable Slack IDs, keeps replies in the current thread, picks the right account when several are set up, and confirms unclear deletes. A skill is a SKILL.md file of instructions (sometimes with scripts and reference notes) that an AI agent loads only when a task calls for it, so the agent knows the steps to follow and what to avoid. It is free and open source.