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 CLI for AI Agents

Use the Slack CLI from KosmoKrator to call Slack tools headlessly, return JSON, inspect schemas, and automate workflows from coding agents, scripts, and CI.

Slack CLI Setup

Slack can be configured headlessly with `kosmokrator integrations:configure slack`.

Install, configure, and verify

# Install KosmoKrator first if it is not available on PATH.
curl -fsSL https://raw.githubusercontent.com/OpenCompanyApp/kosmokrator/main/install.sh | bash

# Configure and verify this integration.
kosmokrator integrations:configure slack --set bot_token="$SLACK_BOT_TOKEN" --enable --read allow --write ask --json
kosmokrator integrations:doctor slack --json
kosmokrator integrations:status --json

Credentials

Authentication type: API token api_token. Configure credentials once, then reuse the same stored profile from scripts, coding CLIs, Lua, and MCP.

Key	Env var	Type	Required	Label
`bot_token`	`SLACK_BOT_TOKEN`	Secret `secret`	yes	Bot Token

Command Patterns

The generic command is stable across every integration. The provider shortcut is shorter for humans.

Generic CLI call

kosmo integrations:call slack.slack_send_message '{"channel":"example_channel","text":"example_text","blocks":"example_blocks","thread_ts":"example_thread_ts","reply_broadcast":true,"unfurl_links":true,"markdown":true}' --json

Provider shortcut

kosmo integrations:slack slack_send_message '{"channel":"example_channel","text":"example_text","blocks":"example_blocks","thread_ts":"example_thread_ts","reply_broadcast":true,"unfurl_links":true,"markdown":true}' --json

Discovery

These commands return structured output for coding agents that need to inspect capabilities before choosing a function.

Discovery commands

kosmo integrations:docs slack --json
kosmo integrations:docs slack.slack_send_message --json
kosmo integrations:schema slack.slack_send_message --json
kosmo integrations:search "Slack" --json
kosmo integrations:list --json

Automation Contexts

The same configured command surface works in these environments. The command does not change unless the host wrapper, credentials, or permissions change.

CI Run integration calls from CI jobs with JSON output, explicit credentials, and predictable exit status. Cron Jobs Schedule repeatable integration workflows from cron while keeping credentials in KosmoKrator config. Shell Scripts Call integration functions from shell scripts with stable JSON input and output. Headless Automation Use KosmoKrator as a non-interactive integration runtime for local automations and wrappers. Coding Agents Let coding agents discover schemas and execute integration functions through CLI commands or MCP.

CLI Functions

Every function below can be called headlessly. Commands are highlighted, copyable, and scroll horizontally when payloads are long.

`slack.slack_send_message`

Send a message to a Slack channel or DM. Supports text, blocks, and thread replies.

Write write

Parameters: channel, text, blocks, thread_ts, reply_broadcast, unfurl_links, markdown

Generic call

kosmo integrations:call slack.slack_send_message '{"channel":"example_channel","text":"example_text","blocks":"example_blocks","thread_ts":"example_thread_ts","reply_broadcast":true,"unfurl_links":true,"markdown":true}' --json

Shortcut

kosmo integrations:slack slack_send_message '{"channel":"example_channel","text":"example_text","blocks":"example_blocks","thread_ts":"example_thread_ts","reply_broadcast":true,"unfurl_links":true,"markdown":true}' --json

`slack.slack_update_message`

Update an existing Slack message.

Write write

Parameters: channel, ts, text, blocks

Generic call

kosmo integrations:call slack.slack_update_message '{"channel":"example_channel","ts":"example_ts","text":"example_text","blocks":"example_blocks"}' --json

Shortcut

kosmo integrations:slack slack_update_message '{"channel":"example_channel","ts":"example_ts","text":"example_text","blocks":"example_blocks"}' --json

`slack.slack_delete_message`

Delete a message from a Slack channel.

Write write

Parameters: channel, ts

Generic call

kosmo integrations:call slack.slack_delete_message '{"channel":"example_channel","ts":"example_ts"}' --json

Shortcut

kosmo integrations:slack slack_delete_message '{"channel":"example_channel","ts":"example_ts"}' --json

`slack.slack_get_message`

Get a specific message by its timestamp. Optionally fetch a message within a thread.

Read read

Parameters: channel, ts, thread_ts

Generic call

kosmo integrations:call slack.slack_get_message '{"channel":"example_channel","ts":"example_ts","thread_ts":"example_thread_ts"}' --json

Shortcut

kosmo integrations:slack slack_get_message '{"channel":"example_channel","ts":"example_ts","thread_ts":"example_thread_ts"}' --json

`slack.slack_search_messages`

Search for messages across all Slack channels and DMs.

Read read

Parameters: query, count, page, sort, sort_dir

Generic call

kosmo integrations:call slack.slack_search_messages '{"query":"example_query","count":1,"page":1,"sort":"example_sort","sort_dir":"example_sort_dir"}' --json

Shortcut

kosmo integrations:slack slack_search_messages '{"query":"example_query","count":1,"page":1,"sort":"example_sort","sort_dir":"example_sort_dir"}' --json

`slack.slack_get_permalink`

Get a permalink URL for a specific Slack message.

Read read

Parameters: channel, message_ts

Generic call

kosmo integrations:call slack.slack_get_permalink '{"channel":"example_channel","message_ts":"example_message_ts"}' --json

Shortcut

kosmo integrations:slack slack_get_permalink '{"channel":"example_channel","message_ts":"example_message_ts"}' --json

`slack.slack_get_channel_history`

Get message history for a Slack channel. Supports pagination with cursors.

Read read

Parameters: channel, limit, oldest, latest, cursor

Generic call

kosmo integrations:call slack.slack_get_channel_history '{"channel":"example_channel","limit":1,"oldest":"example_oldest","latest":"example_latest","cursor":"example_cursor"}' --json

Shortcut

kosmo integrations:slack slack_get_channel_history '{"channel":"example_channel","limit":1,"oldest":"example_oldest","latest":"example_latest","cursor":"example_cursor"}' --json

`slack.slack_get_thread_replies`

Get all replies in a Slack message thread.

Read read

Parameters: channel, ts, limit, cursor

Generic call

kosmo integrations:call slack.slack_get_thread_replies '{"channel":"example_channel","ts":"example_ts","limit":1,"cursor":"example_cursor"}' --json

Shortcut

kosmo integrations:slack slack_get_thread_replies '{"channel":"example_channel","ts":"example_ts","limit":1,"cursor":"example_cursor"}' --json

`slack.slack_list_channels`

List all Slack channels the bot has access to.

Read read

Parameters: types, exclude_archived, limit, cursor

Generic call

kosmo integrations:call slack.slack_list_channels '{"types":"example_types","exclude_archived":true,"limit":1,"cursor":"example_cursor"}' --json

Shortcut

kosmo integrations:slack slack_list_channels '{"types":"example_types","exclude_archived":true,"limit":1,"cursor":"example_cursor"}' --json

`slack.slack_get_channel`

Get detailed information about a Slack channel.

Read read

Parameters: channel

Generic call

kosmo integrations:call slack.slack_get_channel '{"channel":"example_channel"}' --json

Shortcut

kosmo integrations:slack slack_get_channel '{"channel":"example_channel"}' --json

`slack.slack_create_channel`

Create a new Slack channel.

Write write

Parameters: name, is_private

Generic call

kosmo integrations:call slack.slack_create_channel '{"name":"example_name","is_private":true}' --json

Shortcut

kosmo integrations:slack slack_create_channel '{"name":"example_name","is_private":true}' --json

`slack.slack_set_topic`

Set the topic for a Slack channel.

Write write

Parameters: channel, topic

Generic call

kosmo integrations:call slack.slack_set_topic '{"channel":"example_channel","topic":"example_topic"}' --json

Shortcut

kosmo integrations:slack slack_set_topic '{"channel":"example_channel","topic":"example_topic"}' --json

`slack.slack_set_purpose`

Set the purpose for a Slack channel.

Write write

Parameters: channel, purpose

Generic call

kosmo integrations:call slack.slack_set_purpose '{"channel":"example_channel","purpose":"example_purpose"}' --json

Shortcut

kosmo integrations:slack slack_set_purpose '{"channel":"example_channel","purpose":"example_purpose"}' --json

`slack.slack_archive_channel`

Archive a Slack channel.

Write write

Parameters: channel

Generic call

kosmo integrations:call slack.slack_archive_channel '{"channel":"example_channel"}' --json

Shortcut

kosmo integrations:slack slack_archive_channel '{"channel":"example_channel"}' --json

`slack.slack_invite_to_channel`

Invite one or more users to a Slack channel.

Write write

Parameters: channel, users

Generic call

kosmo integrations:call slack.slack_invite_to_channel '{"channel":"example_channel","users":"example_users"}' --json

Shortcut

kosmo integrations:slack slack_invite_to_channel '{"channel":"example_channel","users":"example_users"}' --json

`slack.slack_upload_file`

Upload a file to Slack using the modern external upload flow. The file content is posted to a channel or as a thread reply.

Write write

Parameters: channel, content, filename, title, initial_comment, thread_ts

Generic call

kosmo integrations:call slack.slack_upload_file '{"channel":"example_channel","content":"example_content","filename":"example_filename","title":"example_title","initial_comment":"example_initial_comment","thread_ts":"example_thread_ts"}' --json

Shortcut

kosmo integrations:slack slack_upload_file '{"channel":"example_channel","content":"example_content","filename":"example_filename","title":"example_title","initial_comment":"example_initial_comment","thread_ts":"example_thread_ts"}' --json

`slack.slack_list_files`

List files in Slack, optionally filtered by channel, user, or file type.

Read read

Parameters: channel, user, types, count, page

Generic call

kosmo integrations:call slack.slack_list_files '{"channel":"example_channel","user":"example_user","types":"example_types","count":1,"page":1}' --json

Shortcut

kosmo integrations:slack slack_list_files '{"channel":"example_channel","user":"example_user","types":"example_types","count":1,"page":1}' --json

`slack.slack_get_file`

Get detailed information about a Slack file.

Read read

Parameters: file

Generic call

kosmo integrations:call slack.slack_get_file '{"file":"example_file"}' --json

Shortcut

kosmo integrations:slack slack_get_file '{"file":"example_file"}' --json

`slack.slack_list_users`

List all users in the Slack workspace.

Read read

Parameters: limit, cursor, include_locale

Generic call

kosmo integrations:call slack.slack_list_users '{"limit":1,"cursor":"example_cursor","include_locale":true}' --json

Shortcut

kosmo integrations:slack slack_list_users '{"limit":1,"cursor":"example_cursor","include_locale":true}' --json

`slack.slack_get_user`

Get detailed information about a Slack user by their user ID.

Read read

Parameters: user

Generic call

kosmo integrations:call slack.slack_get_user '{"user":"example_user"}' --json

Shortcut

kosmo integrations:slack slack_get_user '{"user":"example_user"}' --json

`slack.slack_find_user_by_email`

Look up a Slack user by their email address.

Read read

Parameters: email

Generic call

kosmo integrations:call slack.slack_find_user_by_email '{"email":"example_email"}' --json

Shortcut

kosmo integrations:slack slack_find_user_by_email '{"email":"example_email"}' --json

`slack.slack_add_reaction`

Add an emoji reaction to a Slack message.

Write write

Parameters: channel, name, timestamp

Generic call

kosmo integrations:call slack.slack_add_reaction '{"channel":"example_channel","name":"example_name","timestamp":"example_timestamp"}' --json

Shortcut

kosmo integrations:slack slack_add_reaction '{"channel":"example_channel","name":"example_name","timestamp":"example_timestamp"}' --json

`slack.slack_remove_reaction`

Remove an emoji reaction from a Slack message.

Write write

Parameters: channel, name, timestamp

Generic call

kosmo integrations:call slack.slack_remove_reaction '{"channel":"example_channel","name":"example_name","timestamp":"example_timestamp"}' --json

Shortcut

kosmo integrations:slack slack_remove_reaction '{"channel":"example_channel","name":"example_name","timestamp":"example_timestamp"}' --json

`slack.slack_list_usergroups`

List all usergroups in the Slack workspace.

Read read

Parameters: include_count, include_disabled, include_users

Generic call

kosmo integrations:call slack.slack_list_usergroups '{"include_count":true,"include_disabled":true,"include_users":true}' --json

Shortcut

kosmo integrations:slack slack_list_usergroups '{"include_count":true,"include_disabled":true,"include_users":true}' --json

`slack.slack_update_usergroup_members`

Update the members of a Slack usergroup.

Write write

Parameters: usergroup, users

Generic call

kosmo integrations:call slack.slack_update_usergroup_members '{"usergroup":"example_usergroup","users":"example_users"}' --json

Shortcut

kosmo integrations:slack slack_update_usergroup_members '{"usergroup":"example_usergroup","users":"example_users"}' --json

Function Schemas

Use these parameter tables when building CLI payloads without calling integrations:schema first.

slack.slack_send_message 7 parameters

Schema command

kosmo integrations:schema slack.slack_send_message --json

Parameter	Type	Required	Description
`channel`	string	yes	Channel ID or name (e.g., "#general" or "C12345678").
`text`	string	yes	Message text.
`blocks`	string	no	JSON array of Slack Block Kit blocks for rich formatting.
`thread_ts`	string	no	Timestamp of the parent message to reply in a thread.
`reply_broadcast`	boolean	no	If true, also post the reply to the channel (thread_ts required).
`unfurl_links`	boolean	no	If true, enable unfurling of links.
`markdown`	boolean	no	If true, enable mrkdwn formatting in text.

slack.slack_update_message 4 parameters

Schema command

kosmo integrations:schema slack.slack_update_message --json

Parameter	Type	Required	Description
`channel`	string	yes	Channel ID where the message was posted.
`ts`	string	yes	Timestamp of the message to update.
`text`	string	no	New message text.
`blocks`	string	no	JSON array of Slack Block Kit blocks.

slack.slack_delete_message 2 parameters

Schema command

kosmo integrations:schema slack.slack_delete_message --json

Parameter	Type	Required	Description
`channel`	string	yes	Channel ID where the message was posted.
`ts`	string	yes	Timestamp of the message to delete.

slack.slack_get_message 3 parameters

Schema command

kosmo integrations:schema slack.slack_get_message --json

Parameter	Type	Required	Description
`channel`	string	yes	Channel ID.
`ts`	string	yes	Timestamp of the message to retrieve.
`thread_ts`	string	no	If provided, fetches a reply within this thread instead.

slack.slack_search_messages 5 parameters

Schema command

kosmo integrations:schema slack.slack_search_messages --json

Parameter	Type	Required	Description
`query`	string	yes	Search query. Supports Slack search modifiers like "from:", "in:", "has:", etc.
`count`	integer	no	Number of results per page (default 20, max 100).
`page`	integer	no	Page number of results (default 1).
`sort`	string	no	Sort order: "score" (default) or "timestamp".
`sort_dir`	string	no	Sort direction: "desc" (default) or "asc".

slack.slack_get_permalink 2 parameters

Schema command

kosmo integrations:schema slack.slack_get_permalink --json

Parameter	Type	Required	Description
`channel`	string	yes	Channel ID where the message is posted.
`message_ts`	string	yes	Timestamp of the message.

slack.slack_get_channel_history 5 parameters

Schema command

kosmo integrations:schema slack.slack_get_channel_history --json

Parameter	Type	Required	Description
`channel`	string	yes	Channel ID.
`limit`	integer	no	Number of messages to return (default 100, max 1000).
`oldest`	string	no	Start of time range, as a Unix timestamp.
`latest`	string	no	End of time range, as a Unix timestamp.
`cursor`	string	no	Pagination cursor from a previous response.

slack.slack_get_thread_replies 4 parameters

Schema command

kosmo integrations:schema slack.slack_get_thread_replies --json

Parameter	Type	Required	Description
`channel`	string	yes	Channel ID.
`ts`	string	yes	Timestamp of the parent message (thread root).
`limit`	integer	no	Number of replies to return per page (default 1000).
`cursor`	string	no	Pagination cursor from a previous response.

slack.slack_list_channels 4 parameters

Schema command

kosmo integrations:schema slack.slack_list_channels --json

Parameter	Type	Required	Description
`types`	string	no	Comma-separated channel types: "public_channel", "private_channel", "mpim", "im". Default: "public_channel".
`exclude_archived`	boolean	no	Exclude archived channels (default: true).
`limit`	integer	no	Number of channels to return per page (default 100, max 1000).
`cursor`	string	no	Pagination cursor from a previous response.

slack.slack_get_channel 1 parameters

Schema command

kosmo integrations:schema slack.slack_get_channel --json

Parameter	Type	Required	Description
`channel`	string	yes	Channel ID.

slack.slack_create_channel 2 parameters

Schema command

kosmo integrations:schema slack.slack_create_channel --json

Parameter	Type	Required	Description
`name`	string	yes	Channel name (lowercase, no spaces, max 80 chars).
`is_private`	boolean	no	Create a private channel instead of a public one (default: false).

slack.slack_set_topic 2 parameters

Schema command

kosmo integrations:schema slack.slack_set_topic --json

Parameter	Type	Required	Description
`channel`	string	yes	Channel ID.
`topic`	string	yes	The new topic text.

slack.slack_set_purpose 2 parameters

Schema command

kosmo integrations:schema slack.slack_set_purpose --json

Parameter	Type	Required	Description
`channel`	string	yes	Channel ID.
`purpose`	string	yes	The new purpose text.

slack.slack_archive_channel 1 parameters

Schema command

kosmo integrations:schema slack.slack_archive_channel --json

Parameter	Type	Required	Description
`channel`	string	yes	Channel ID to archive.

slack.slack_invite_to_channel 2 parameters

Schema command

kosmo integrations:schema slack.slack_invite_to_channel --json

Parameter	Type	Required	Description
`channel`	string	yes	Channel ID.
`users`	string	yes	Comma-separated list of user IDs to invite.

slack.slack_upload_file 6 parameters

Schema command

kosmo integrations:schema slack.slack_upload_file --json

Parameter	Type	Required	Description
`channel`	string	yes	Channel ID to post the file to.
`content`	string	yes	File content (text).
`filename`	string	yes	Filename with extension (e.g., "report.txt").
`title`	string	no	Title of the file.
`initial_comment`	string	no	Comment to include with the file post.
`thread_ts`	string	no	Timestamp of the parent message to reply in a thread.

slack.slack_list_files 5 parameters

Schema command

kosmo integrations:schema slack.slack_list_files --json

Parameter	Type	Required	Description
`channel`	string	no	Channel ID to filter files by.
`user`	string	no	User ID to filter files by.
`types`	string	no	Comma-separated file types: "spaces", "snippets", "images", "gdocs", "zips", "pdfs".
`count`	integer	no	Number of files per page (default 100).
`page`	integer	no	Page number (default 1).

slack.slack_get_file 1 parameters

Schema command

kosmo integrations:schema slack.slack_get_file --json

Parameter	Type	Required	Description
`file`	string	yes	File ID.

slack.slack_list_users 3 parameters

Schema command

kosmo integrations:schema slack.slack_list_users --json

Parameter	Type	Required	Description
`limit`	integer	no	Number of users per page (default 100, max 1000).
`cursor`	string	no	Pagination cursor from a previous response.
`include_locale`	boolean	no	Include user locale information (default: false).

slack.slack_get_user 1 parameters

Schema command

kosmo integrations:schema slack.slack_get_user --json

Parameter	Type	Required	Description
`user`	string	yes	User ID.

slack.slack_find_user_by_email 1 parameters

Schema command

kosmo integrations:schema slack.slack_find_user_by_email --json

Parameter	Type	Required	Description
`email`	string	yes	Email address to look up.

slack.slack_add_reaction 3 parameters

Schema command

kosmo integrations:schema slack.slack_add_reaction --json

Parameter	Type	Required	Description
`channel`	string	yes	Channel ID where the message is posted.
`name`	string	yes	Emoji name without colons (e.g., "thumbsup", "heart").
`timestamp`	string	yes	Timestamp of the message to react to.

slack.slack_remove_reaction 3 parameters

Schema command

kosmo integrations:schema slack.slack_remove_reaction --json

Parameter	Type	Required	Description
`channel`	string	yes	Channel ID where the message is posted.
`name`	string	yes	Emoji name without colons (e.g., "thumbsup", "heart").
`timestamp`	string	yes	Timestamp of the message.

slack.slack_list_usergroups 3 parameters

Schema command

kosmo integrations:schema slack.slack_list_usergroups --json

Parameter	Type	Required	Description
`include_count`	boolean	no	Include the number of users in each usergroup (default: false).
`include_disabled`	boolean	no	Include disabled usergroups (default: false).
`include_users`	boolean	no	Include the list of users in each usergroup (default: false).

slack.slack_update_usergroup_members 2 parameters

Schema command

kosmo integrations:schema slack.slack_update_usergroup_members --json

Parameter	Type	Required	Description
`usergroup`	string	yes	Usergroup ID.
`users`	string	yes	Comma-separated list of user IDs to set as members.

Permissions

Headless calls still follow the integration read/write permission policy. Configure read/write defaults with integrations:configure. Add --force only for trusted automation that should bypass that policy.