Can I use Slack as a CLI?

Yes. KosmoKrator exposes a Slack CLI through kosmo integrations:call and the provider shortcut command. Commands can return JSON for scripts, CI, and coding agents.

Can I expose Slack through MCP?

Yes. The KosmoKrator MCP gateway can expose selected Slack tools to clients such as Claude Code, Cursor, Codex, and other MCP-compatible tools.

Where are Slack credentials stored?

Slack credentials are configured in KosmoKrator's local integration settings and reused by CLI, Lua, and MCP gateway surfaces.

Can I deny write access for Slack MCP tools?

Yes. Start the gateway with --write=deny for read-only clients, or use ask/allow only for trusted workspaces.

productivity

Slack MCP Integration for Claude Code

Connect Slack to Claude Code through the local KosmoKrator MCP gateway with scoped tools, credentials, and write policy.

25 functions 13 read 12 write API token auth

Submit Slack feedback View package source

Connect Slack to Claude Code

Connect local KosmoKrator integrations to Claude Code through one scoped MCP gateway entry.

Add KosmoKrator as a stdio MCP server in the Claude Code project config and select the integrations that should be visible. The gateway is local, scoped to this integration, and starts with --write=deny so Claude Code can inspect read-capable tools without receiving write access by default.

Slack MCP Config for Claude Code

Claude Code can launch the local kosmo binary directly from the project MCP config.

{
  "mcpServers": {
    "kosmokrator-slack": {
      "type": "stdio",
      "command": "kosmo",
      "args": [
        "mcp:serve",
        "--integration=slack",
        "--write=deny"
      ]
    }
  }
}

Run the Gateway Manually

kosmokrator mcp:serve --integration=slack --write=deny

Why Use KosmoKrator Here

Scoped tools

Expose only Slack instead of a broad multi-service tool list.

Local credentials

Reuse credentials already configured for the KosmoKrator CLI and Lua runtime.

Write policy

Start read-only, then opt into ask or allow for trusted workspaces.

Slack Tools Visible to Claude Code

Claude Code sees stable MCP tool names generated from the Slack integration catalog.

MCP tool	Source function	Type	Description
`integration__slack__slack_send_message`	`slack.slack_send_message`	Write	Send a message to a Slack channel or DM. Supports text, blocks, and thread replies.
`integration__slack__slack_update_message`	`slack.slack_update_message`	Write	Update an existing Slack message.
`integration__slack__slack_delete_message`	`slack.slack_delete_message`	Write	Delete a message from a Slack channel.
`integration__slack__slack_get_message`	`slack.slack_get_message`	Read	Get a specific message by its timestamp. Optionally fetch a message within a thread.
`integration__slack__slack_search_messages`	`slack.slack_search_messages`	Read	Search for messages across all Slack channels and DMs.
`integration__slack__slack_get_permalink`	`slack.slack_get_permalink`	Read	Get a permalink URL for a specific Slack message.
`integration__slack__slack_get_channel_history`	`slack.slack_get_channel_history`	Read	Get message history for a Slack channel. Supports pagination with cursors.
`integration__slack__slack_get_thread_replies`	`slack.slack_get_thread_replies`	Read	Get all replies in a Slack message thread.
`integration__slack__slack_list_channels`	`slack.slack_list_channels`	Read	List all Slack channels the bot has access to.
`integration__slack__slack_get_channel`	`slack.slack_get_channel`	Read	Get detailed information about a Slack channel.
`integration__slack__slack_create_channel`	`slack.slack_create_channel`	Write	Create a new Slack channel.
`integration__slack__slack_set_topic`	`slack.slack_set_topic`	Write	Set the topic for a Slack channel.
`integration__slack__slack_set_purpose`	`slack.slack_set_purpose`	Write	Set the purpose for a Slack channel.
`integration__slack__slack_archive_channel`	`slack.slack_archive_channel`	Write	Archive a Slack channel.
`integration__slack__slack_invite_to_channel`	`slack.slack_invite_to_channel`	Write	Invite one or more users to a Slack channel.
`integration__slack__slack_upload_file`	`slack.slack_upload_file`	Write	Upload a file to Slack using the modern external upload flow. The file content is posted to a channel or as a thread reply.
`integration__slack__slack_list_files`	`slack.slack_list_files`	Read	List files in Slack, optionally filtered by channel, user, or file type.
`integration__slack__slack_get_file`	`slack.slack_get_file`	Read	Get detailed information about a Slack file.
`integration__slack__slack_list_users`	`slack.slack_list_users`	Read	List all users in the Slack workspace.
`integration__slack__slack_get_user`	`slack.slack_get_user`	Read	Get detailed information about a Slack user by their user ID.
`integration__slack__slack_find_user_by_email`	`slack.slack_find_user_by_email`	Read	Look up a Slack user by their email address.
`integration__slack__slack_add_reaction`	`slack.slack_add_reaction`	Write	Add an emoji reaction to a Slack message.
`integration__slack__slack_remove_reaction`	`slack.slack_remove_reaction`	Write	Remove an emoji reaction from a Slack message.
`integration__slack__slack_list_usergroups`	`slack.slack_list_usergroups`	Read	List all usergroups in the Slack workspace.
`integration__slack__slack_update_usergroup_members`	`slack.slack_update_usergroup_members`	Write	Update the members of a Slack usergroup.

Related Slack Pages

Slack CLIUse direct JSON commands instead of MCP discovery. Slack MCPFull gateway reference and MCP tool names. KosmoKrator for Claude CodeClient-level gateway setup.