Slack CLI
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Use Slack CLI
Run Slack CLI commands with the configured Slack connection.
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Slack integration for background agents
Enable access to Slack Web API endpoints and Slack Events API callbacks.
Integration details
Connection
- MCP via Slack app
Agent actions
Slack MCP
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slack_auth_test
Check Slack authentication state.
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slack_conversations_list
List Slack conversations.
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slack_conversations_info
Show details for a Slack conversation.
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slack_conversations_history
Fetch Slack conversation history.
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slack_conversations_replies
Fetch replies in a Slack thread.
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slack_chat_post_message
Post a Slack message to a conversation or thread with text, Block Kit blocks, block elements, and attachments.
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slack_chat_update
Update a Slack message with text, Block Kit blocks, block elements, and attachments.
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slack_chat_delete
Delete a Slack message.
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slack_chat_get_permalink
Get a permalink for a Slack message.
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slack_reactions_add
Add a Slack message reaction.
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slack_reactions_remove
Remove a Slack message reaction.
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slack_files_info
Show Slack file metadata.
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slack_files_download
Download a Slack file to a local path.
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slack_files_upload
Upload a local file to Slack.
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slack_emoji_list
List Slack emoji.
Credential safety
Credential-less sandboxes
Mistle lets agents access connected services without placing provider credentials inside the sandbox. Approved outbound requests are routed through Mistle's credential proxy, where authentication happens outside the agent runtime.
Credentials stay encrypted in Mistle's control plane and are applied only when a request is authorized for the calling sandbox and organization.
Read the credential-less sandboxes article