Slack Send, update, delete messages, add reactions in Slack or trigger workflows from Slack events
Slack is a business communication platform that offers teams a unified place for messaging, tools, and files.
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With Slack, you can:
Automate agent notifications : Send real-time updates from your Sim agents to any Slack channel
Create webhook endpoints : Configure Slack bots as webhooks to trigger Sim workflows from Slack activities
Enhance agent workflows : Integrate Slack messaging into your agents to deliver results, alerts, and status updates
Create and share Slack canvases : Programmatically generate collaborative documents (canvases) in Slack channels
Read messages from channels : Retrieve and process recent messages from any Slack channel for monitoring or workflow triggers
Manage bot messages : Update, delete, and add reactions to messages sent by your bot
In Sim, the Slack integration enables your agents to programmatically interact with Slack with full message management capabilities as part of their workflows:
Send messages : Agents can send formatted messages to any Slack channel or user, supporting Slack's mrkdwn syntax for rich formatting
Update messages : Edit previously sent bot messages to correct information or provide status updates
Delete messages : Remove bot messages when they're no longer needed or contain errors
Add reactions : Express sentiment or acknowledgment by adding emoji reactions to any message
Create canvases : Create and share Slack canvases (collaborative documents) directly in channels, enabling richer content sharing and documentation
Read messages : Read recent messages from channels, allowing for monitoring, reporting, or triggering further actions based on channel activity
Download files : Retrieve files shared in Slack channels for processing or archival
This allows for powerful automation scenarios such as sending notifications with dynamic updates, managing conversational flows with editable status messages, acknowledging important messages with reactions, and maintaining clean channels by removing outdated bot messages. Your agents can deliver timely information, update messages as workflows progress, create collaborative documents, or alert team members when attention is needed. This integration bridges the gap between your AI workflows and your team's communication, ensuring everyone stays informed with accurate, up-to-date information. By connecting Sim with Slack, you can create agents that keep your team updated with relevant information at the right time, enhance collaboration by sharing and updating insights automatically, and reduce the need for manual status updates—all while leveraging your existing Slack workspace where your team already communicates.
Integrate Slack into the workflow. Can send, update, and delete messages, create canvases, read messages, and add reactions. Requires Bot Token instead of OAuth in advanced mode. Can be used in trigger mode to trigger a workflow when a message is sent to a channel.
Send messages to Slack channels or direct messages. Supports Slack mrkdwn formatting.
Parameter Type Required Description authMethodstring No Authentication method: oauth or bot_token botTokenstring No Bot token for Custom Bot channelstring No Target Slack channel (e.g., #general) userIdstring No Target Slack user ID for direct messages (e.g., U1234567890) textstring Yes Message text to send (supports Slack mrkdwn formatting) thread_tsstring No Thread timestamp to reply to (creates thread reply) filesfile[] No Files to attach to the message
Parameter Type Description messageobject Complete message object with all properties returned by Slack tsstring Message timestamp channelstring Channel ID where message was sent fileCountnumber Number of files uploaded (when files are attached)
Create and share Slack canvases in channels. Canvases are collaborative documents within Slack.
Parameter Type Required Description authMethodstring No Authentication method: oauth or bot_token botTokenstring No Bot token for Custom Bot channelstring Yes Target Slack channel (e.g., #general) titlestring Yes Title of the canvas contentstring Yes Canvas content in markdown format document_contentobject No Structured canvas document content
Parameter Type Description canvas_idstring ID of the created canvas channelstring Channel where canvas was created titlestring Title of the canvas
Read the latest messages from Slack channels. Retrieve conversation history with filtering options.
Parameter Type Required Description authMethodstring No Authentication method: oauth or bot_token botTokenstring No Bot token for Custom Bot channelstring No Slack channel to read messages from (e.g., #general) userIdstring No User ID for DM conversation (e.g., U1234567890) limitnumber No Number of messages to retrieve (default: 10, max: 15) oldeststring No Start of time range (timestamp) lateststring No End of time range (timestamp)
Parameter Type Description messagesarray Array of message objects from the channel ↳ type string Message type ↳ ts string Edit timestamp ↳ text string Message text content ↳ user string User ID who edited ↳ bot_id string Bot ID if sent by a bot ↳ username string Display username ↳ channel string Channel ID ↳ team string Team ID ↳ thread_ts string Thread parent message timestamp ↳ parent_user_id string User ID of thread parent ↳ reply_count number Number of thread replies ↳ reply_users_count number Number of users who replied ↳ latest_reply string Timestamp of latest reply ↳ subscribed boolean Whether user is subscribed to thread ↳ last_read string Last read timestamp ↳ unread_count number Number of unread messages ↳ subtype string Message subtype ↳ reactions array Array of reactions on this message ↳ name string Emoji name ↳ count number Number of reactions ↳ users array Array of user IDs who reacted ↳ name string File name ↳ count number Number of reactions ↳ users array Array of user IDs who reacted ↳ is_starred boolean Whether message is starred ↳ pinned_to array Array of channel IDs where message is pinned ↳ files array Array of files attached to message ↳ id string File ID ↳ name string File name ↳ mimetype string MIME type ↳ size number File size in bytes ↳ url_private string Private download URL ↳ permalink string Permanent link to file ↳ mode string File mode ↳ id string File ID ↳ mimetype string MIME type ↳ size number File size in bytes ↳ url_private string Private download URL ↳ permalink string Permanent link to message ↳ mode string File mode ↳ attachments array Array of legacy attachments ↳ blocks array Array of Block Kit blocks ↳ edited object Edit information if message was edited ↳ user string User ID who edited ↳ ts string Edit timestamp
Retrieve a specific message by its timestamp. Useful for getting a thread parent message.
Parameter Type Required Description authMethodstring No Authentication method: oauth or bot_token botTokenstring No Bot token for Custom Bot channelstring Yes Slack channel ID (e.g., C1234567890) timestampstring Yes Message timestamp to retrieve (e.g., 1405894322.002768)
Parameter Type Description messageobject The retrieved message object ↳ type string Message type ↳ ts string Edit timestamp ↳ text string Message text content ↳ user string User ID who edited ↳ bot_id string Bot ID if sent by a bot ↳ username string Display username ↳ channel string Channel ID ↳ team string Team ID ↳ thread_ts string Thread parent timestamp ↳ parent_user_id string User ID of thread parent ↳ reply_count number Number of thread replies ↳ reply_users_count number Number of users who replied ↳ latest_reply string Timestamp of latest reply ↳ subtype string Message subtype ↳ reactions array Array of reactions on this message ↳ name string Emoji name ↳ count number Number of reactions ↳ users array User IDs who reacted ↳ name string File name ↳ count number Number of reactions ↳ users array User IDs who reacted ↳ is_starred boolean Whether message is starred ↳ pinned_to array Channel IDs where message is pinned ↳ files array Files attached to message ↳ id string File ID ↳ name string File name ↳ mimetype string MIME type ↳ size number File size in bytes ↳ url_private string Private download URL ↳ permalink string Permanent link to file ↳ id string File ID ↳ mimetype string MIME type ↳ size number File size in bytes ↳ url_private string Private download URL ↳ permalink string Permanent link to message ↳ attachments array Legacy attachments ↳ blocks array Block Kit blocks ↳ edited object Edit information if message was edited ↳ user string User ID who edited ↳ ts string Edit timestamp
Retrieve an entire thread including the parent message and all replies. Useful for getting full conversation context.
Parameter Type Required Description authMethodstring No Authentication method: oauth or bot_token botTokenstring No Bot token for Custom Bot channelstring Yes Slack channel ID (e.g., C1234567890) threadTsstring Yes Thread timestamp (thread_ts) to retrieve (e.g., 1405894322.002768) limitnumber No Maximum number of messages to return (default: 100, max: 200)
Parameter Type Description parentMessageobject The thread parent message ↳ type string Message type ↳ ts string Message timestamp ↳ text string Message text content ↳ user string User ID who sent the message ↳ bot_id string Bot ID if sent by a bot ↳ username string Display username ↳ reply_count number Total number of thread replies ↳ reply_users_count number Number of users who replied ↳ latest_reply string Timestamp of latest reply ↳ reactions array Array of reactions on the parent message ↳ name string Emoji name ↳ count number Number of reactions ↳ users array User IDs who reacted ↳ name string File name ↳ count number Number of reactions ↳ users array User IDs who reacted ↳ files array Files attached to the parent message ↳ id string File ID ↳ name string File name ↳ mimetype string MIME type ↳ size number File size in bytes ↳ id string File ID ↳ mimetype string MIME type ↳ size number File size in bytes repliesarray Array of reply messages in the thread (excluding the parent) ↳ ts string Message timestamp ↳ text string Message text content ↳ user string User ID who sent the reply ↳ reactions array Reactions on the reply ↳ files array Files attached to the reply messagesarray All messages in the thread (parent + replies) in chronological order replyCountnumber Number of replies returned in this response hasMoreboolean Whether there are more messages in the thread (pagination needed)
List all channels in a Slack workspace. Returns public and private channels the bot has access to.
Parameter Type Required Description authMethodstring No Authentication method: oauth or bot_token botTokenstring No Bot token for Custom Bot includePrivateboolean No Include private channels the bot is a member of (default: true) excludeArchivedboolean No Exclude archived channels (default: true) limitnumber No Maximum number of channels to return (default: 100, max: 200)
Parameter Type Description channelsarray Array of channel objects from the workspace ↳ id string Channel ID (e.g., C1234567890) ↳ name string Channel name without # prefix ↳ is_private boolean Whether the channel is private ↳ is_archived boolean Whether the channel is archived ↳ is_member boolean Whether the bot is a member of the channel ↳ num_members number Number of members in the channel ↳ topic string Channel topic ↳ purpose string Channel purpose/description ↳ created number Unix timestamp when channel was created ↳ creator string User ID of channel creator idsarray Array of channel IDs for easy access namesarray Array of channel names for easy access countnumber Total number of channels returned
List all members (user IDs) in a Slack channel. Use with Get User Info to resolve IDs to names.
Parameter Type Required Description authMethodstring No Authentication method: oauth or bot_token botTokenstring No Bot token for Custom Bot channelstring Yes Channel ID to list members from limitnumber No Maximum number of members to return (default: 100, max: 200)
Parameter Type Description membersarray Array of user IDs who are members of the channel (e.g., U1234567890) countnumber Total number of members returned
List all users in a Slack workspace. Returns user profiles with names and avatars.
Parameter Type Required Description authMethodstring No Authentication method: oauth or bot_token botTokenstring No Bot token for Custom Bot includeDeletedboolean No Include deactivated/deleted users (default: false) limitnumber No Maximum number of users to return (default: 100, max: 200)
Parameter Type Description usersarray Array of user objects from the workspace ↳ id string User ID (e.g., U1234567890) ↳ name string Username (handle) ↳ real_name string Full real name ↳ display_name string Display name shown in Slack ↳ is_bot boolean Whether the user is a bot ↳ is_admin boolean Whether the user is a workspace admin ↳ is_owner boolean Whether the user is the workspace owner ↳ deleted boolean Whether the user is deactivated ↳ timezone string User timezone identifier ↳ avatar string URL to user avatar image ↳ status_text string Custom status text ↳ status_emoji string Custom status emoji idsarray Array of user IDs for easy access namesarray Array of usernames for easy access countnumber Total number of users returned
Get detailed information about a specific Slack user by their user ID.
Parameter Type Required Description authMethodstring No Authentication method: oauth or bot_token botTokenstring No Bot token for Custom Bot userIdstring Yes User ID to look up (e.g., U1234567890)
Parameter Type Description userobject Detailed user information ↳ id string User ID ↳ name string Username (handle) ↳ real_name string Full real name ↳ display_name string Display name shown in Slack ↳ first_name string First name ↳ last_name string Last name ↳ title string Job title ↳ phone string Phone number ↳ skype string Skype handle ↳ is_bot boolean Whether the user is a bot ↳ is_admin boolean Whether the user is a workspace admin ↳ is_owner boolean Whether the user is the workspace owner ↳ is_primary_owner boolean Whether the user is the primary owner ↳ is_restricted boolean Whether the user is a guest (restricted) ↳ is_ultra_restricted boolean Whether the user is a single-channel guest ↳ deleted boolean Whether the user is deactivated ↳ timezone string Timezone identifier (e.g., America/Los_Angeles) ↳ timezone_label string Human-readable timezone label ↳ timezone_offset number Timezone offset in seconds from UTC ↳ avatar_24 string URL to 24px avatar ↳ avatar_48 string URL to 48px avatar ↳ avatar_72 string URL to 72px avatar ↳ avatar_192 string URL to 192px avatar ↳ avatar_512 string URL to 512px avatar ↳ status_text string Custom status text ↳ status_emoji string Custom status emoji ↳ status_expiration number Unix timestamp when status expires ↳ updated number Unix timestamp of last profile update
Download a file from Slack
Parameter Type Required Description authMethodstring No Authentication method: oauth or bot_token botTokenstring No Bot token for Custom Bot fileIdstring Yes The ID of the file to download fileNamestring No Optional filename override
Parameter Type Description filefile Downloaded file stored in execution files
Update a message previously sent by the bot in Slack
Parameter Type Required Description authMethodstring No Authentication method: oauth or bot_token botTokenstring No Bot token for Custom Bot channelstring Yes Channel ID where the message was posted (e.g., C1234567890) timestampstring Yes Timestamp of the message to update (e.g., 1405894322.002768) textstring Yes New message text (supports Slack mrkdwn formatting)
Parameter Type Description messageobject Complete updated message object with all properties returned by Slack contentstring Success message metadataobject Updated message metadata ↳ channel string Channel ID ↳ timestamp string Message timestamp ↳ text string Updated message text
Delete a message previously sent by the bot in Slack
Parameter Type Required Description authMethodstring No Authentication method: oauth or bot_token botTokenstring No Bot token for Custom Bot channelstring Yes Channel ID where the message was posted (e.g., C1234567890) timestampstring Yes Timestamp of the message to delete (e.g., 1405894322.002768)
Parameter Type Description contentstring Success message metadataobject Deleted message metadata ↳ channel string Channel ID ↳ timestamp string Message timestamp
Add an emoji reaction to a Slack message
Parameter Type Required Description authMethodstring No Authentication method: oauth or bot_token botTokenstring No Bot token for Custom Bot channelstring Yes Channel ID where the message was posted (e.g., C1234567890) timestampstring Yes Timestamp of the message to react to (e.g., 1405894322.002768) namestring Yes Name of the emoji reaction (without colons, e.g., thumbsup, heart, eyes)
Parameter Type Description contentstring Success message metadataobject Reaction metadata ↳ channel string Channel ID ↳ timestamp string Message timestamp ↳ reaction string Emoji reaction name