Slack

Slack Add Reaction

Add a reaction emoji to a Slack message. Use the message's ts from channel history as the timestamp. Common reactions: thumbsup, heart, fire, eyes, white_check_mark, rocket, tada. Adding the same reaction twice is idempotent (no error).

Slack Auth Test

Verify the saved Slack token is accepted by Slack's auth.test endpoint. Use after connecting or rotating a bot, user, or app-level token.

Slack Channel Members

List members of a Slack channel. Returns user IDs of all members. Look up workspace users by user ID for profile details. Requires the bot to be in the channel.

Slack Channel Messages

Read messages from a Slack channel or DM. Accepts #name, @user, or channel id. Limit can be a count or time window (7d, 1w). User IDs resolve to display names from the workspace directory.

Slack Channels

Get Slack channels and DMs. Pass channel_id as #name, @user, or raw id for one channel, or omit to list. Returns directory metadata (cache age, counts). Set refresh=true after workspace changes to rebuild the name index.

Slack Get File

Get Slack file metadata (name, type, size, permalink). Set download=true to fetch file bytes; large files return a presigned download link instead of inline content.

Slack Get Thread Replies

Get all replies in a Slack message thread. Accepts #channel, @user DM, or channel id. The first message in the response is the parent. Limit accepts count or time window (7d).

Slack Join Channel

Join a public Slack channel so the bot can read and post messages. Call this when reading history or posting returns a not_in_channel error. Only works for public channels — private channels require a manual invite. If already in the channel, this is a no-op.

Slack Post Message

Post a new message to a Slack channel. Accepts #channel, @dm-user, or channel id. Returns the posted message ts for threading.

Slack Remove Reaction

Remove a reaction emoji from a Slack message. Use the message ts from channel history. Removing a reaction that is not present is idempotent.

Slack Reply To Thread

Reply to a message thread in Slack. The thread_ts is the ts of the parent message — from channel history or from a recent post response.

Slack Search Messages

Search messages across Slack. Pass natural language or a permalink as query, plus optional filters for channel, author, dates, and threads-only. Uses user search token when available; falls back to bot search.

Slack Update Usergroup Members

Add or remove workspace members from a Slack @mention usergroup. Pass add_user_ids and/or remove_user_ids; user ids and @handles are accepted.

Slack Upsert Usergroup

Create or update a Slack @mention usergroup. Omit usergroup_id to create; pass usergroup_id to update name, handle, description, channels, or enabled state.

Slack Usergroups

List Slack @mention usergroups or fetch one by usergroup_id. Usergroups group members for broadcast mentions.

Slack Users

Get Slack workspace members. Pass user_id as @handle or U… id for one profile, or omit to list. Includes directory metadata on list responses.