Sim

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.

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editable status messages, acknowledging important messages with reactions, and maintaining clean channels by removing outdated bot messages.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.

Usage Instructions

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.

Tools

slack_message

Send messages to Slack channels or direct messages. Supports Slack mrkdwn formatting.

Input

ParameterTypeRequiredDescription
authMethodstringNoAuthentication method: oauth or bot_token
botTokenstringNoBot token for Custom Bot
channelstringNoTarget Slack channel (e.g., #general)
userIdstringNoTarget Slack user ID for direct messages (e.g., U1234567890)
textstringYesMessage text to send (supports Slack mrkdwn formatting)
thread_tsstringNoThread timestamp to reply to (creates thread reply)
filesfile[]NoFiles to attach to the message

Output

ParameterTypeDescription
messageobjectComplete message object with all properties returned by Slack
tsstringMessage timestamp
channelstringChannel ID where message was sent
fileCountnumberNumber of files uploaded (when files are attached)

slack_canvas

Create and share Slack canvases in channels. Canvases are collaborative documents within Slack.

Input

ParameterTypeRequiredDescription
authMethodstringNoAuthentication method: oauth or bot_token
botTokenstringNoBot token for Custom Bot
channelstringYesTarget Slack channel (e.g., #general)
titlestringYesTitle of the canvas
contentstringYesCanvas content in markdown format
document_contentobjectNoStructured canvas document content

Output

ParameterTypeDescription
canvas_idstringID of the created canvas
channelstringChannel where canvas was created
titlestringTitle of the canvas

slack_message_reader

Read the latest messages from Slack channels. Retrieve conversation history with filtering options.

Input

ParameterTypeRequiredDescription
authMethodstringNoAuthentication method: oauth or bot_token
botTokenstringNoBot token for Custom Bot
channelstringNoSlack channel to read messages from (e.g., #general)
userIdstringNoUser ID for DM conversation (e.g., U1234567890)
limitnumberNoNumber of messages to retrieve (default: 10, max: 15)
oldeststringNoStart of time range (timestamp)
lateststringNoEnd of time range (timestamp)

Output

ParameterTypeDescription
messagesarrayArray of message objects from the channel
typestringMessage type
tsstringEdit timestamp
textstringMessage text content
userstringUser ID who edited
bot_idstringBot ID if sent by a bot
usernamestringDisplay username
channelstringChannel ID
teamstringTeam ID
thread_tsstringThread parent message timestamp
parent_user_idstringUser ID of thread parent
reply_countnumberNumber of thread replies
reply_users_countnumberNumber of users who replied
latest_replystringTimestamp of latest reply
subscribedbooleanWhether user is subscribed to thread
last_readstringLast read timestamp
unread_countnumberNumber of unread messages
subtypestringMessage subtype
reactionsarrayArray of reactions on this message
namestringEmoji name
countnumberNumber of reactions
usersarrayArray of user IDs who reacted
namestringFile name
countnumberNumber of reactions
usersarrayArray of user IDs who reacted
is_starredbooleanWhether message is starred
pinned_toarrayArray of channel IDs where message is pinned
filesarrayArray of files attached to message
idstringFile ID
namestringFile name
mimetypestringMIME type
sizenumberFile size in bytes
url_privatestringPrivate download URL
permalinkstringPermanent link to file
modestringFile mode
idstringFile ID
mimetypestringMIME type
sizenumberFile size in bytes
url_privatestringPrivate download URL
permalinkstringPermanent link to message
modestringFile mode
attachmentsarrayArray of legacy attachments
blocksarrayArray of Block Kit blocks
editedobjectEdit information if message was edited
userstringUser ID who edited
tsstringEdit timestamp

slack_get_message

Retrieve a specific message by its timestamp. Useful for getting a thread parent message.

Input

ParameterTypeRequiredDescription
authMethodstringNoAuthentication method: oauth or bot_token
botTokenstringNoBot token for Custom Bot
channelstringYesSlack channel ID (e.g., C1234567890)
timestampstringYesMessage timestamp to retrieve (e.g., 1405894322.002768)

Output

ParameterTypeDescription
messageobjectThe retrieved message object
typestringMessage type
tsstringEdit timestamp
textstringMessage text content
userstringUser ID who edited
bot_idstringBot ID if sent by a bot
usernamestringDisplay username
channelstringChannel ID
teamstringTeam ID
thread_tsstringThread parent timestamp
parent_user_idstringUser ID of thread parent
reply_countnumberNumber of thread replies
reply_users_countnumberNumber of users who replied
latest_replystringTimestamp of latest reply
subtypestringMessage subtype
reactionsarrayArray of reactions on this message
namestringEmoji name
countnumberNumber of reactions
usersarrayUser IDs who reacted
namestringFile name
countnumberNumber of reactions
usersarrayUser IDs who reacted
is_starredbooleanWhether message is starred
pinned_toarrayChannel IDs where message is pinned
filesarrayFiles attached to message
idstringFile ID
namestringFile name
mimetypestringMIME type
sizenumberFile size in bytes
url_privatestringPrivate download URL
permalinkstringPermanent link to file
idstringFile ID
mimetypestringMIME type
sizenumberFile size in bytes
url_privatestringPrivate download URL
permalinkstringPermanent link to message
attachmentsarrayLegacy attachments
blocksarrayBlock Kit blocks
editedobjectEdit information if message was edited
userstringUser ID who edited
tsstringEdit timestamp

slack_get_thread

Retrieve an entire thread including the parent message and all replies. Useful for getting full conversation context.

Input

ParameterTypeRequiredDescription
authMethodstringNoAuthentication method: oauth or bot_token
botTokenstringNoBot token for Custom Bot
channelstringYesSlack channel ID (e.g., C1234567890)
threadTsstringYesThread timestamp (thread_ts) to retrieve (e.g., 1405894322.002768)
limitnumberNoMaximum number of messages to return (default: 100, max: 200)

Output

ParameterTypeDescription
parentMessageobjectThe thread parent message
typestringMessage type
tsstringMessage timestamp
textstringMessage text content
userstringUser ID who sent the message
bot_idstringBot ID if sent by a bot
usernamestringDisplay username
reply_countnumberTotal number of thread replies
reply_users_countnumberNumber of users who replied
latest_replystringTimestamp of latest reply
reactionsarrayArray of reactions on the parent message
namestringEmoji name
countnumberNumber of reactions
usersarrayUser IDs who reacted
namestringFile name
countnumberNumber of reactions
usersarrayUser IDs who reacted
filesarrayFiles attached to the parent message
idstringFile ID
namestringFile name
mimetypestringMIME type
sizenumberFile size in bytes
idstringFile ID
mimetypestringMIME type
sizenumberFile size in bytes
repliesarrayArray of reply messages in the thread (excluding the parent)
tsstringMessage timestamp
textstringMessage text content
userstringUser ID who sent the reply
reactionsarrayReactions on the reply
filesarrayFiles attached to the reply
messagesarrayAll messages in the thread (parent + replies) in chronological order
replyCountnumberNumber of replies returned in this response
hasMorebooleanWhether there are more messages in the thread (pagination needed)

slack_list_channels

List all channels in a Slack workspace. Returns public and private channels the bot has access to.

Input

ParameterTypeRequiredDescription
authMethodstringNoAuthentication method: oauth or bot_token
botTokenstringNoBot token for Custom Bot
includePrivatebooleanNoInclude private channels the bot is a member of (default: true)
excludeArchivedbooleanNoExclude archived channels (default: true)
limitnumberNoMaximum number of channels to return (default: 100, max: 200)

Output

ParameterTypeDescription
channelsarrayArray of channel objects from the workspace
idstringChannel ID (e.g., C1234567890)
namestringChannel name without # prefix
is_privatebooleanWhether the channel is private
is_archivedbooleanWhether the channel is archived
is_memberbooleanWhether the bot is a member of the channel
num_membersnumberNumber of members in the channel
topicstringChannel topic
purposestringChannel purpose/description
creatednumberUnix timestamp when channel was created
creatorstringUser ID of channel creator
idsarrayArray of channel IDs for easy access
namesarrayArray of channel names for easy access
countnumberTotal number of channels returned

slack_list_members

List all members (user IDs) in a Slack channel. Use with Get User Info to resolve IDs to names.

Input

ParameterTypeRequiredDescription
authMethodstringNoAuthentication method: oauth or bot_token
botTokenstringNoBot token for Custom Bot
channelstringYesChannel ID to list members from
limitnumberNoMaximum number of members to return (default: 100, max: 200)

Output

ParameterTypeDescription
membersarrayArray of user IDs who are members of the channel (e.g., U1234567890)
countnumberTotal number of members returned

slack_list_users

List all users in a Slack workspace. Returns user profiles with names and avatars.

Input

ParameterTypeRequiredDescription
authMethodstringNoAuthentication method: oauth or bot_token
botTokenstringNoBot token for Custom Bot
includeDeletedbooleanNoInclude deactivated/deleted users (default: false)
limitnumberNoMaximum number of users to return (default: 100, max: 200)

Output

ParameterTypeDescription
usersarrayArray of user objects from the workspace
idstringUser ID (e.g., U1234567890)
namestringUsername (handle)
real_namestringFull real name
display_namestringDisplay name shown in Slack
is_botbooleanWhether the user is a bot
is_adminbooleanWhether the user is a workspace admin
is_ownerbooleanWhether the user is the workspace owner
deletedbooleanWhether the user is deactivated
timezonestringUser timezone identifier
avatarstringURL to user avatar image
status_textstringCustom status text
status_emojistringCustom status emoji
idsarrayArray of user IDs for easy access
namesarrayArray of usernames for easy access
countnumberTotal number of users returned

slack_get_user

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

Input

ParameterTypeRequiredDescription
authMethodstringNoAuthentication method: oauth or bot_token
botTokenstringNoBot token for Custom Bot
userIdstringYesUser ID to look up (e.g., U1234567890)

Output

ParameterTypeDescription
userobjectDetailed user information
idstringUser ID
namestringUsername (handle)
real_namestringFull real name
display_namestringDisplay name shown in Slack
first_namestringFirst name
last_namestringLast name
titlestringJob title
phonestringPhone number
skypestringSkype handle
is_botbooleanWhether the user is a bot
is_adminbooleanWhether the user is a workspace admin
is_ownerbooleanWhether the user is the workspace owner
is_primary_ownerbooleanWhether the user is the primary owner
is_restrictedbooleanWhether the user is a guest (restricted)
is_ultra_restrictedbooleanWhether the user is a single-channel guest
deletedbooleanWhether the user is deactivated
timezonestringTimezone identifier (e.g., America/Los_Angeles)
timezone_labelstringHuman-readable timezone label
timezone_offsetnumberTimezone offset in seconds from UTC
avatar_24stringURL to 24px avatar
avatar_48stringURL to 48px avatar
avatar_72stringURL to 72px avatar
avatar_192stringURL to 192px avatar
avatar_512stringURL to 512px avatar
status_textstringCustom status text
status_emojistringCustom status emoji
status_expirationnumberUnix timestamp when status expires
updatednumberUnix timestamp of last profile update

slack_download

Download a file from Slack

Input

ParameterTypeRequiredDescription
authMethodstringNoAuthentication method: oauth or bot_token
botTokenstringNoBot token for Custom Bot
fileIdstringYesThe ID of the file to download
fileNamestringNoOptional filename override

Output

ParameterTypeDescription
filefileDownloaded file stored in execution files

slack_update_message

Update a message previously sent by the bot in Slack

Input

ParameterTypeRequiredDescription
authMethodstringNoAuthentication method: oauth or bot_token
botTokenstringNoBot token for Custom Bot
channelstringYesChannel ID where the message was posted (e.g., C1234567890)
timestampstringYesTimestamp of the message to update (e.g., 1405894322.002768)
textstringYesNew message text (supports Slack mrkdwn formatting)

Output

ParameterTypeDescription
messageobjectComplete updated message object with all properties returned by Slack
contentstringSuccess message
metadataobjectUpdated message metadata
channelstringChannel ID
timestampstringMessage timestamp
textstringUpdated message text

slack_delete_message

Delete a message previously sent by the bot in Slack

Input

ParameterTypeRequiredDescription
authMethodstringNoAuthentication method: oauth or bot_token
botTokenstringNoBot token for Custom Bot
channelstringYesChannel ID where the message was posted (e.g., C1234567890)
timestampstringYesTimestamp of the message to delete (e.g., 1405894322.002768)

Output

ParameterTypeDescription
contentstringSuccess message
metadataobjectDeleted message metadata
channelstringChannel ID
timestampstringMessage timestamp

slack_add_reaction

Add an emoji reaction to a Slack message

Input

ParameterTypeRequiredDescription
authMethodstringNoAuthentication method: oauth or bot_token
botTokenstringNoBot token for Custom Bot
channelstringYesChannel ID where the message was posted (e.g., C1234567890)
timestampstringYesTimestamp of the message to react to (e.g., 1405894322.002768)
namestringYesName of the emoji reaction (without colons, e.g., thumbsup, heart, eyes)

Output

ParameterTypeDescription
contentstringSuccess message
metadataobjectReaction metadata
channelstringChannel ID
timestampstringMessage timestamp
reactionstringEmoji reaction name
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