Critical-risk tools in Slack

Critical severity Slack MCP Server 29 of 204 tools

29 of the 204 tools in Slack are classified as critical risk. This page profiles those tools specifically, with recommended policy actions and the attack patterns that target them.

Every operation listed below is an action PolicyLayer recommends controlling at the transport layer. Open any tool to see the full profile, risk score, and YAML policy snippet.

Tools at critical risk

apps_manifest_delete Destructive

Permanently deletes an app created through app manifests.
apps_uninstall Destructive

Uninstall your app from a workspace.
auth_revoke Destructive

Revoke a token.
bookmarks_remove Destructive

Remove a bookmark from a channel.
cache_clear Destructive

Clear the Slack MCP cache so subsequent calls fetch fresh data from the API.
calls_participants_remove Destructive

Register participants removed from a call.
canvases_access_delete Destructive

canvases_access_delete
canvases_delete Destructive

Delete a canvas.
channels_delete Destructive

Delete a channel (legacy undocumented).
chat_delete Destructive

chat_delete
chat_delete_scheduled_message Destructive

chat_delete_scheduled_message
conversations_kick Destructive

Remove a user from a conversation.
drafts_delete Destructive

drafts_delete
emoji_remove Destructive

Remove a custom emoji (undocumented session endpoint).
files_comments_delete Destructive

Delete an existing comment on a file.
files_delete Destructive

Delete a file.
files_remote_remove Destructive

Remove a remote file.
files_revoke_public_url Destructive

Revoke public/external sharing access for a file.
pins_remove Destructive

Unpin an item from a channel.
reactions_remove Destructive

reactions_remove
reminders_delete Destructive

Delete a reminder.
saved_delete Destructive

saved_delete
slack_lists_access_delete Destructive

Remove access to a list for specified entities.
slack_lists_items_delete Destructive

Delete a list item.
slack_lists_items_delete_multiple Destructive

Delete multiple list items.
stars_remove Destructive

stars_remove
team_external_teams_disconnect Destructive

Disconnect an external organization.
users_admin_set_inactive Destructive

Deactivate a user (legacy undocumented).
users_delete_photo Destructive

Delete the user profile photo.

Attacks that target this class

Critical-risk tools in any server share these documented attack patterns. Each links to the full case and the defensive policy.

Destructive Action Autonomy
Privilege escalation via admin-only tools
Data exfiltration via tool chaining
Runaway Tool Loops

Critical-risk tools in Slack

Tools at critical risk

Attacks that target this class

More on Slack

Enforce policy on every Slack tool call.