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Read and send workspace messages, DMs, and search. Posting, marking read, and uploading files need Write action on for Slack in Settings → Connectors. You ask in Chat. The model picks the tool. Writes wait for your approval unless you set Slack to Always allow. Tool names show in Recent tool actions. You do not type them.

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MCP calls

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read
Searches the workspace and returns matching messages (author, channel, text, timestamp).
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read
Returns recent messages in one channel, group, or DM.
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read
Lists workspace channels, optionally matching a name.
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read
Lists channels and DMs you belong to, most recently updated first.
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read
Resolves a person to Slack user id, name, and username.
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write
Posts a message to a channel or DM.
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write
Replies in an existing thread.
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read
Lists unread DMs and recent mentions of you.
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write
Moves a DM’s read marker.
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write
Uploads files or images to a channel or person.
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read
Groups what is waiting in Slack DMs and mentions (or a sample inbox).
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read
Suggests actions for those groups. webAI does not change those groups until you approve the plan on the canvas.