feat(slack): add remove reaction tool

apps/docs/content/docs/en/tools/slack.mdx

@@ -1,6 +1,6 @@
 ---
 title: Slack
-description: Send, update, delete messages, send ephemeral messages, add reactions in Slack or trigger workflows from Slack events
+description: Send, update, delete messages, send ephemeral messages, add or remove reactions in Slack or trigger workflows from Slack events
 ---
 
 import { BlockInfoCard } from "@/components/ui/block-info-card"
@@ -39,7 +39,7 @@ If you encounter issues with the Slack integration, contact us at [help@sim.ai](
 
 ## Usage Instructions
 
-Integrate Slack into the workflow. Can send, update, and delete messages, send ephemeral messages visible only to a specific user, 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.
+Integrate Slack into the workflow. Can send, update, and delete messages, send ephemeral messages visible only to a specific user, create canvases, read messages, and add or remove 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.
 
 
 
@@ -799,4 +799,28 @@ Add an emoji reaction to a Slack message
 |   ↳ `timestamp` | string | Message timestamp |
 |   ↳ `reaction` | string | Emoji reaction name |
 
+### `slack_remove_reaction`
+
+Remove an emoji reaction from a Slack message
+
+#### Input
+
+| Parameter | Type | Required | Description |
+| --------- | ---- | -------- | ----------- |
+| `authMethod` | string | No | Authentication method: oauth or bot_token |
+| `botToken` | string | No | Bot token for Custom Bot |
+| `channel` | string | Yes | Channel ID where the message was posted \(e.g., C1234567890\) |
+| `timestamp` | string | Yes | Timestamp of the message to remove reaction from \(e.g., 1405894322.002768\) |
+| `name` | string | Yes | Name of the emoji reaction to remove \(without colons, e.g., thumbsup, heart, eyes\) |
+
+#### Output
+
+| Parameter | Type | Description |
+| --------- | ---- | ----------- |
+| `content` | string | Success message |
+| `metadata` | object | Reaction metadata |
+|   ↳ `channel` | string | Channel ID |
+|   ↳ `timestamp` | string | Message timestamp |
+|   ↳ `reaction` | string | Emoji reaction name |
+
 

apps/sim/app/api/tools/slack/remove-reaction/route.ts

@@ -0,0 +1,87 @@
+import { type NextRequest, NextResponse } from 'next/server'
+import { z } from 'zod'
+import { checkInternalAuth } from '@/lib/auth/hybrid'
+
+export const dynamic = 'force-dynamic'
+
+const SlackRemoveReactionSchema = z.object({
+  accessToken: z.string().min(1, 'Access token is required'),
+  channel: z.string().min(1, 'Channel is required'),
+  timestamp: z.string().min(1, 'Message timestamp is required'),
+  name: z.string().min(1, 'Emoji name is required'),
+})
+
+export async function POST(request: NextRequest) {
+  try {
+    const authResult = await checkInternalAuth(request, { requireWorkflowId: false })
+
+    if (!authResult.success) {
+      return NextResponse.json(
+        {
+          success: false,
+          error: authResult.error || 'Authentication required',
+        },
+        { status: 401 }
+      )
+    }
+
+    const body = await request.json()
+    const validatedData = SlackRemoveReactionSchema.parse(body)
+
+    const slackResponse = await fetch('https://slack.com/api/reactions.remove', {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json',
+        Authorization: `Bearer ${validatedData.accessToken}`,
+      },
+      body: JSON.stringify({
+        channel: validatedData.channel,
+        timestamp: validatedData.timestamp,
+        name: validatedData.name,
+      }),
+    })
+
+    const data = await slackResponse.json()
+
+    if (!data.ok) {
+      return NextResponse.json(
+        {
+          success: false,
+          error: data.error || 'Failed to remove reaction',
+        },
+        { status: slackResponse.status }
+      )
+    }
+
+    return NextResponse.json({
+      success: true,
+      output: {
+        content: `Successfully removed :${validatedData.name}: reaction`,
+        metadata: {
+          channel: validatedData.channel,
+          timestamp: validatedData.timestamp,
+          reaction: validatedData.name,
+        },
+      },
+    })
+  } catch (error) {
+    if (error instanceof z.ZodError) {
+      return NextResponse.json(
+        {
+          success: false,
+          error: 'Invalid request data',
+          details: error.errors,
+        },
+        { status: 400 }
+      )
+    }
+
+    return NextResponse.json(
+      {
+        success: false,
+        error: error instanceof Error ? error.message : 'Unknown error occurred',
+      },
+      { status: 500 }
+    )
+  }
+}

apps/sim/blocks/blocks/slack.ts

@@ -9,10 +9,10 @@ export const SlackBlock: BlockConfig<SlackResponse> = {
   type: 'slack',
   name: 'Slack',
   description:
-    'Send, update, delete messages, send ephemeral messages, add reactions in Slack or trigger workflows from Slack events',
+    'Send, update, delete messages, send ephemeral messages, add or remove reactions in Slack or trigger workflows from Slack events',
   authMode: AuthMode.OAuth,
   longDescription:
-    'Integrate Slack into the workflow. Can send, update, and delete messages, send ephemeral messages visible only to a specific user, 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.',
+    'Integrate Slack into the workflow. Can send, update, and delete messages, send ephemeral messages visible only to a specific user, create canvases, read messages, and add or remove 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.',
   docsLink: 'https://docs.sim.ai/tools/slack',
   category: 'tools',
   bgColor: '#611f69',
@@ -38,6 +38,7 @@ export const SlackBlock: BlockConfig<SlackResponse> = {
         { label: 'Update Message', id: 'update' },
         { label: 'Delete Message', id: 'delete' },
         { label: 'Add Reaction', id: 'react' },
+        { label: 'Remove Reaction', id: 'unreact' },
       ],
       value: () => 'send',
     },
@@ -608,7 +609,7 @@ Return ONLY the timestamp string - no explanations, no quotes, no extra text.`,
       placeholder: 'Message timestamp (e.g., 1405894322.002768)',
       condition: {
         field: 'operation',
-        value: 'react',
+        value: ['react', 'unreact'],
       },
       required: true,
     },
@@ -619,7 +620,7 @@ Return ONLY the timestamp string - no explanations, no quotes, no extra text.`,
       placeholder: 'Emoji name without colons (e.g., thumbsup, heart, eyes)',
       condition: {
         field: 'operation',
-        value: 'react',
+        value: ['react', 'unreact'],
       },
       required: true,
     },
@@ -641,6 +642,7 @@ Return ONLY the timestamp string - no explanations, no quotes, no extra text.`,
       'slack_update_message',
       'slack_delete_message',
       'slack_add_reaction',
+      'slack_remove_reaction',
     ],
     config: {
       tool: (params) => {
@@ -673,6 +675,8 @@ Return ONLY the timestamp string - no explanations, no quotes, no extra text.`,
             return 'slack_delete_message'
           case 'react':
             return 'slack_add_reaction'
+          case 'unreact':
+            return 'slack_remove_reaction'
           default:
             throw new Error(`Invalid Slack operation: ${params.operation}`)
         }
@@ -841,6 +845,7 @@ Return ONLY the timestamp string - no explanations, no quotes, no extra text.`,
             break
 
           case 'react':
+          case 'unreact':
             baseParams.timestamp = reactionTimestamp
             baseParams.name = emojiName
             break

apps/sim/tools/registry.ts

@@ -1808,6 +1808,7 @@ import {
   slackListUsersTool,
   slackMessageReaderTool,
   slackMessageTool,
+  slackRemoveReactionTool,
   slackUpdateMessageTool,
 } from '@/tools/slack'
 import { smsSendTool } from '@/tools/sms'
@@ -2611,6 +2612,7 @@ export const tools: Record<string, ToolConfig> = {
   slack_update_message: slackUpdateMessageTool,
   slack_delete_message: slackDeleteMessageTool,
   slack_add_reaction: slackAddReactionTool,
+  slack_remove_reaction: slackRemoveReactionTool,
   github_repo_info: githubRepoInfoTool,
   github_repo_info_v2: githubRepoInfoV2Tool,
   github_latest_commit: githubLatestCommitTool,

apps/sim/tools/slack/index.ts

@@ -11,6 +11,7 @@ import { slackListMembersTool } from '@/tools/slack/list_members'
 import { slackListUsersTool } from '@/tools/slack/list_users'
 import { slackMessageTool } from '@/tools/slack/message'
 import { slackMessageReaderTool } from '@/tools/slack/message_reader'
+import { slackRemoveReactionTool } from '@/tools/slack/remove_reaction'
 import { slackUpdateMessageTool } from '@/tools/slack/update_message'
 
 export {
@@ -22,6 +23,7 @@ export {
   slackUpdateMessageTool,
   slackDeleteMessageTool,
   slackAddReactionTool,
+  slackRemoveReactionTool,
   slackListChannelsTool,
   slackListMembersTool,
   slackListUsersTool,

apps/sim/tools/slack/remove_reaction.ts

@@ -0,0 +1,108 @@
+import type { SlackRemoveReactionParams, SlackRemoveReactionResponse } from '@/tools/slack/types'
+import { REACTION_METADATA_OUTPUT_PROPERTIES } from '@/tools/slack/types'
+import type { ToolConfig } from '@/tools/types'
+
+export const slackRemoveReactionTool: ToolConfig<
+  SlackRemoveReactionParams,
+  SlackRemoveReactionResponse
+> = {
+  id: 'slack_remove_reaction',
+  name: 'Slack Remove Reaction',
+  description: 'Remove an emoji reaction from a Slack message',
+  version: '1.0.0',
+
+  oauth: {
+    required: true,
+    provider: 'slack',
+  },
+
+  params: {
+    authMethod: {
+      type: 'string',
+      required: false,
+      visibility: 'user-only',
+      description: 'Authentication method: oauth or bot_token',
+    },
+    botToken: {
+      type: 'string',
+      required: false,
+      visibility: 'user-only',
+      description: 'Bot token for Custom Bot',
+    },
+    accessToken: {
+      type: 'string',
+      required: false,
+      visibility: 'hidden',
+      description: 'OAuth access token or bot token for Slack API',
+    },
+    channel: {
+      type: 'string',
+      required: true,
+      visibility: 'user-or-llm',
+      description: 'Channel ID where the message was posted (e.g., C1234567890)',
+    },
+    timestamp: {
+      type: 'string',
+      required: true,
+      visibility: 'user-or-llm',
+      description: 'Timestamp of the message to remove reaction from (e.g., 1405894322.002768)',
+    },
+    name: {
+      type: 'string',
+      required: true,
+      visibility: 'user-or-llm',
+      description:
+        'Name of the emoji reaction to remove (without colons, e.g., thumbsup, heart, eyes)',
+    },
+  },
+
+  request: {
+    url: '/api/tools/slack/remove-reaction',
+    method: 'POST',
+    headers: () => ({
+      'Content-Type': 'application/json',
+    }),
+    body: (params: SlackRemoveReactionParams) => ({
+      accessToken: params.accessToken || params.botToken,
+      channel: params.channel,
+      timestamp: params.timestamp,
+      name: params.name,
+    }),
+  },
+
+  transformResponse: async (response: Response) => {
+    const data = await response.json()
+
+    if (!data.success) {
+      return {
+        success: false,
+        output: {
+          content: data.error || 'Failed to remove reaction',
+          metadata: {
+            channel: '',
+            timestamp: '',
+            reaction: '',
+          },
+        },
+        error: data.error,
+      }
+    }
+
+    return {
+      success: true,
+      output: {
+        content: data.output.content,
+        metadata: data.output.metadata,
+      },
+    }
+  },
+
+  outputs: {
+    content: { type: 'string', description: 'Success message' },
+    metadata: {
+      type: 'object',
+      description: 'Reaction metadata',
+      properties: REACTION_METADATA_OUTPUT_PROPERTIES,
+    },
+  },
+}

apps/sim/tools/slack/types.ts

@@ -561,6 +561,12 @@ export interface SlackAddReactionParams extends SlackBaseParams {
   name: string
 }
 
+export interface SlackRemoveReactionParams extends SlackBaseParams {
+  channel: string
+  timestamp: string
+  name: string
+}
+
 export interface SlackListChannelsParams extends SlackBaseParams {
   includePrivate?: boolean
   excludeArchived?: boolean
@@ -759,6 +765,17 @@ export interface SlackAddReactionResponse extends ToolResponse {
   }
 }
 
+export interface SlackRemoveReactionResponse extends ToolResponse {
+  output: {
+    content: string
+    metadata: {
+      channel: string
+      timestamp: string
+      reaction: string
+    }
+  }
+}
+
 export interface SlackChannel {
   id: string
   name: string
@@ -866,6 +883,7 @@ export type SlackResponse =
   | SlackUpdateMessageResponse
   | SlackDeleteMessageResponse
   | SlackAddReactionResponse
+  | SlackRemoveReactionResponse
   | SlackListChannelsResponse
   | SlackListMembersResponse
   | SlackListUsersResponse