diff --git a/apps/docs/content/docs/en/tools/slack.mdx b/apps/docs/content/docs/en/tools/slack.mdx
index 46b5a66d8e..3054a9a4b3 100644
--- a/apps/docs/content/docs/en/tools/slack.mdx
+++ b/apps/docs/content/docs/en/tools/slack.mdx
@@ -73,8 +73,10 @@ Send messages to Slack channels or users through the Slack API. Supports Slack m
 
 | Parameter | Type | Description |
 | --------- | ---- | ----------- |
+| `message` | object | Complete message object with all properties returned by Slack |
 | `ts` | string | Message timestamp |
 | `channel` | string | Channel ID where message was sent |
+| `fileCount` | number | Number of files uploaded \(when files are attached\) |
 
 ### `slack_canvas`
 
@@ -157,6 +159,7 @@ Update a message previously sent by the bot in Slack
 
 | Parameter | Type | Description |
 | --------- | ---- | ----------- |
+| `message` | object | Complete updated message object with all properties returned by Slack |
 | `content` | string | Success message |
 | `metadata` | object | Updated message metadata |
 
diff --git a/apps/sim/app/api/tools/slack/send-message/route.ts b/apps/sim/app/api/tools/slack/send-message/route.ts
index 2470a685e5..a9f3b5f34c 100644
--- a/apps/sim/app/api/tools/slack/send-message/route.ts
+++ b/apps/sim/app/api/tools/slack/send-message/route.ts
@@ -78,9 +78,16 @@ export async function POST(request: NextRequest) {
       }
 
       logger.info(`[${requestId}] Message sent successfully`)
+      const messageObj = data.message || {
+        type: 'message',
+        ts: data.ts,
+        text: validatedData.text,
+        channel: data.channel,
+      }
       return NextResponse.json({
         success: true,
         output: {
+          message: messageObj,
           ts: data.ts,
           channel: data.channel,
         },
@@ -107,9 +114,16 @@ export async function POST(request: NextRequest) {
       })
 
       const data = await response.json()
+      const messageObj = data.message || {
+        type: 'message',
+        ts: data.ts,
+        text: validatedData.text,
+        channel: data.channel,
+      }
       return NextResponse.json({
         success: true,
         output: {
+          message: messageObj,
           ts: data.ts,
           channel: data.channel,
         },
@@ -174,9 +188,16 @@ export async function POST(request: NextRequest) {
       })
 
       const data = await response.json()
+      const messageObj = data.message || {
+        type: 'message',
+        ts: data.ts,
+        text: validatedData.text,
+        channel: data.channel,
+      }
       return NextResponse.json({
         success: true,
         output: {
+          message: messageObj,
           ts: data.ts,
           channel: data.channel,
         },
@@ -211,10 +232,28 @@ export async function POST(request: NextRequest) {
 
     logger.info(`[${requestId}] Files uploaded and shared successfully`)
 
+    // For file uploads, construct a message object
+    const fileTs = completeData.files?.[0]?.created?.toString() || (Date.now() / 1000).toString()
+    const fileMessage = {
+      type: 'message',
+      ts: fileTs,
+      text: validatedData.text,
+      channel: validatedData.channel,
+      files: completeData.files?.map((file: any) => ({
+        id: file?.id,
+        name: file?.name,
+        mimetype: file?.mimetype,
+        size: file?.size,
+        url_private: file?.url_private,
+        permalink: file?.permalink,
+      })),
+    }
+
     return NextResponse.json({
       success: true,
       output: {
-        ts: completeData.files?.[0]?.created || Date.now() / 1000,
+        message: fileMessage,
+        ts: fileTs,
         channel: validatedData.channel,
         fileCount: uploadedFileIds.length,
       },
diff --git a/apps/sim/app/api/tools/slack/update-message/route.ts b/apps/sim/app/api/tools/slack/update-message/route.ts
index 2056113940..7eaab100ee 100644
--- a/apps/sim/app/api/tools/slack/update-message/route.ts
+++ b/apps/sim/app/api/tools/slack/update-message/route.ts
@@ -78,14 +78,22 @@ export async function POST(request: NextRequest) {
       timestamp: data.ts,
     })
 
+    const messageObj = data.message || {
+      type: 'message',
+      ts: data.ts,
+      text: data.text || validatedData.text,
+      channel: data.channel,
+    }
+
     return NextResponse.json({
       success: true,
       output: {
+        message: messageObj,
         content: 'Message updated successfully',
         metadata: {
           channel: data.channel,
           timestamp: data.ts,
-          text: data.text,
+          text: data.text || validatedData.text,
         },
       },
     })
diff --git a/apps/sim/blocks/blocks/slack.ts b/apps/sim/blocks/blocks/slack.ts
index c0ff5dadfc..8bdb7ac118 100644
--- a/apps/sim/blocks/blocks/slack.ts
+++ b/apps/sim/blocks/blocks/slack.ts
@@ -464,18 +464,29 @@ export const SlackBlock: BlockConfig<SlackResponse> = {
     thread_ts: { type: 'string', description: 'Thread timestamp for reply' },
   },
   outputs: {
-    // slack_message outputs
+    // slack_message outputs (send operation)
+    message: {
+      type: 'json',
+      description:
+        'Complete message object with all properties: ts, text, user, channel, reactions, threads, files, attachments, blocks, stars, pins, and edit history',
+    },
+    // Legacy properties for send operation (backward compatibility)
     ts: { type: 'string', description: 'Message timestamp returned by Slack API' },
     channel: { type: 'string', description: 'Channel identifier where message was sent' },
+    fileCount: {
+      type: 'number',
+      description: 'Number of files uploaded (when files are attached)',
+    },
 
     // slack_canvas outputs
     canvas_id: { type: 'string', description: 'Canvas identifier for created canvases' },
     title: { type: 'string', description: 'Canvas title' },
 
-    // slack_message_reader outputs
+    // slack_message_reader outputs (read operation)
     messages: {
       type: 'json',
-      description: 'Array of message objects with text, user, timestamp, and file attachments',
+      description:
+        'Array of message objects with comprehensive properties: text, user, timestamp, reactions, threads, files, attachments, blocks, stars, pins, and edit history',
     },
 
     // slack_download outputs
@@ -484,6 +495,13 @@ export const SlackBlock: BlockConfig<SlackResponse> = {
       description: 'Downloaded file stored in execution files',
     },
 
+    // slack_update_message outputs (update operation)
+    content: { type: 'string', description: 'Success message for update operation' },
+    metadata: {
+      type: 'json',
+      description: 'Updated message metadata (legacy, use message object instead)',
+    },
+
     // Trigger outputs (when used as webhook trigger)
     event_type: { type: 'string', description: 'Type of Slack event that triggered the workflow' },
     channel_name: { type: 'string', description: 'Human-readable channel name' },
diff --git a/apps/sim/tools/slack/message.ts b/apps/sim/tools/slack/message.ts
index 049fed37ff..55d92bd874 100644
--- a/apps/sim/tools/slack/message.ts
+++ b/apps/sim/tools/slack/message.ts
@@ -87,7 +87,16 @@ export const slackMessageTool: ToolConfig<SlackMessageParams, SlackMessageRespon
   },
 
   outputs: {
+    message: {
+      type: 'object',
+      description: 'Complete message object with all properties returned by Slack',
+    },
+    // Legacy properties for backward compatibility
     ts: { type: 'string', description: 'Message timestamp' },
     channel: { type: 'string', description: 'Channel ID where message was sent' },
+    fileCount: {
+      type: 'number',
+      description: 'Number of files uploaded (when files are attached)',
+    },
   },
 }
diff --git a/apps/sim/tools/slack/message_reader.ts b/apps/sim/tools/slack/message_reader.ts
index 8d8a77fb7a..eb92152f6e 100644
--- a/apps/sim/tools/slack/message_reader.ts
+++ b/apps/sim/tools/slack/message_reader.ts
@@ -89,18 +89,59 @@ export const slackMessageReaderTool: ToolConfig<
     const data = await response.json()
 
     const messages = (data.messages || []).map((message: any) => ({
+      // Core properties
+      type: message.type || 'message',
       ts: message.ts,
       text: message.text || '',
-      user: message.user || message.bot_id || 'unknown',
-      type: message.type || 'message',
+      user: message.user,
+      bot_id: message.bot_id,
+      username: message.username,
+      channel: message.channel,
+      team: message.team,
+
+      // Thread properties
+      thread_ts: message.thread_ts,
+      parent_user_id: message.parent_user_id,
+      reply_count: message.reply_count,
+      reply_users_count: message.reply_users_count,
+      latest_reply: message.latest_reply,
+      subscribed: message.subscribed,
+      last_read: message.last_read,
+      unread_count: message.unread_count,
+
+      // Message subtype
       subtype: message.subtype,
+
+      // Reactions and interactions
+      reactions: message.reactions?.map((reaction: any) => ({
+        name: reaction.name,
+        count: reaction.count,
+        users: reaction.users || [],
+      })),
+      is_starred: message.is_starred,
+      pinned_to: message.pinned_to,
+
+      // Content attachments
       files: message.files?.map((file: any) => ({
         id: file.id,
         name: file.name,
         mimetype: file.mimetype,
         size: file.size,
         url_private: file.url_private,
+        permalink: file.permalink,
+        mode: file.mode,
       })),
+      attachments: message.attachments,
+      blocks: message.blocks,
+
+      // Metadata
+      edited: message.edited
+        ? {
+            user: message.edited.user,
+            ts: message.edited.ts,
+          }
+        : undefined,
+      permalink: message.permalink,
     }))
 
     return {
@@ -118,24 +159,91 @@ export const slackMessageReaderTool: ToolConfig<
       items: {
         type: 'object',
         properties: {
-          ts: { type: 'string' },
-          text: { type: 'string' },
-          user: { type: 'string' },
-          type: { type: 'string' },
-          subtype: { type: 'string' },
+          // Core properties
+          type: { type: 'string', description: 'Message type' },
+          ts: { type: 'string', description: 'Message timestamp' },
+          text: { type: 'string', description: 'Message text content' },
+          user: { type: 'string', description: 'User ID who sent the message' },
+          bot_id: { type: 'string', description: 'Bot ID if sent by a bot' },
+          username: { type: 'string', description: 'Display username' },
+          channel: { type: 'string', description: 'Channel ID' },
+          team: { type: 'string', description: 'Team ID' },
+
+          // Thread properties
+          thread_ts: { type: 'string', description: 'Thread parent message timestamp' },
+          parent_user_id: { type: 'string', description: 'User ID of thread parent' },
+          reply_count: { type: 'number', description: 'Number of thread replies' },
+          reply_users_count: { type: 'number', description: 'Number of users who replied' },
+          latest_reply: { type: 'string', description: 'Timestamp of latest reply' },
+          subscribed: { type: 'boolean', description: 'Whether user is subscribed to thread' },
+          last_read: { type: 'string', description: 'Last read timestamp' },
+          unread_count: { type: 'number', description: 'Number of unread messages' },
+
+          // Message subtype
+          subtype: { type: 'string', description: 'Message subtype' },
+
+          // Reactions and interactions
+          reactions: {
+            type: 'array',
+            description: 'Array of reactions on this message',
+            items: {
+              type: 'object',
+              properties: {
+                name: { type: 'string', description: 'Emoji name' },
+                count: { type: 'number', description: 'Number of reactions' },
+                users: {
+                  type: 'array',
+                  description: 'Array of user IDs who reacted',
+                  items: { type: 'string' },
+                },
+              },
+            },
+          },
+          is_starred: { type: 'boolean', description: 'Whether message is starred' },
+          pinned_to: {
+            type: 'array',
+            description: 'Array of channel IDs where message is pinned',
+            items: { type: 'string' },
+          },
+
+          // Content attachments
           files: {
             type: 'array',
+            description: 'Array of files attached to message',
             items: {
               type: 'object',
               properties: {
-                id: { type: 'string' },
-                name: { type: 'string' },
-                mimetype: { type: 'string' },
-                size: { type: 'number' },
-                url_private: { type: 'string' },
+                id: { type: 'string', description: 'File ID' },
+                name: { type: 'string', description: 'File name' },
+                mimetype: { type: 'string', description: 'MIME type' },
+                size: { type: 'number', description: 'File size in bytes' },
+                url_private: { type: 'string', description: 'Private download URL' },
+                permalink: { type: 'string', description: 'Permanent link to file' },
+                mode: { type: 'string', description: 'File mode' },
               },
             },
           },
+          attachments: {
+            type: 'array',
+            description: 'Array of legacy attachments',
+            items: { type: 'object' },
+          },
+          blocks: {
+            type: 'array',
+            description: 'Array of Block Kit blocks',
+            items: { type: 'object' },
+          },
+
+          // Metadata
+          edited: {
+            type: 'object',
+            description: 'Edit information if message was edited',
+            properties: {
+              user: { type: 'string', description: 'User ID who edited' },
+              ts: { type: 'string', description: 'Edit timestamp' },
+            },
+          },
+          permalink: { type: 'string', description: 'Permanent link to message' },
         },
       },
     },
diff --git a/apps/sim/tools/slack/types.ts b/apps/sim/tools/slack/types.ts
index a5bdbef5dd..4737f49639 100644
--- a/apps/sim/tools/slack/types.ts
+++ b/apps/sim/tools/slack/types.ts
@@ -51,8 +51,12 @@ export interface SlackAddReactionParams extends SlackBaseParams {
 
 export interface SlackMessageResponse extends ToolResponse {
   output: {
+    // Legacy properties for backward compatibility
     ts: string
     channel: string
+    fileCount?: number
+    // New comprehensive message object
+    message: SlackMessage
   }
 }
 
@@ -64,22 +68,96 @@ export interface SlackCanvasResponse extends ToolResponse {
   }
 }
 
+export interface SlackReaction {
+  name: string
+  count: number
+  users: string[]
+}
+
+export interface SlackMessageEdited {
+  user: string
+  ts: string
+}
+
+export interface SlackAttachment {
+  id?: number
+  fallback?: string
+  text?: string
+  pretext?: string
+  color?: string
+  fields?: Array<{
+    title: string
+    value: string
+    short?: boolean
+  }>
+  author_name?: string
+  author_link?: string
+  author_icon?: string
+  title?: string
+  title_link?: string
+  image_url?: string
+  thumb_url?: string
+  footer?: string
+  footer_icon?: string
+  ts?: string
+}
+
+export interface SlackBlock {
+  type: string
+  block_id?: string
+  [key: string]: any // Blocks can have various properties depending on type
+}
+
+export interface SlackMessage {
+  // Core properties
+  type: string
+  ts: string
+  text: string
+  user?: string
+  bot_id?: string
+  username?: string
+  channel?: string
+  team?: string
+
+  // Thread properties
+  thread_ts?: string
+  parent_user_id?: string
+  reply_count?: number
+  reply_users_count?: number
+  latest_reply?: string
+  subscribed?: boolean
+  last_read?: string
+  unread_count?: number
+
+  // Message subtype
+  subtype?: string
+
+  // Reactions and interactions
+  reactions?: SlackReaction[]
+  is_starred?: boolean
+  pinned_to?: string[]
+
+  // Content attachments
+  files?: Array<{
+    id: string
+    name: string
+    mimetype: string
+    size: number
+    url_private?: string
+    permalink?: string
+    mode?: string
+  }>
+  attachments?: SlackAttachment[]
+  blocks?: SlackBlock[]
+
+  // Metadata
+  edited?: SlackMessageEdited
+  permalink?: string
+}
+
 export interface SlackMessageReaderResponse extends ToolResponse {
   output: {
-    messages: Array<{
-      ts: string
-      text: string
-      user: string
-      type: string
-      subtype?: string
-      files?: Array<{
-        id: string
-        name: string
-        mimetype: string
-        size: number
-        url_private?: string
-      }>
-    }>
+    messages: SlackMessage[]
   }
 }
 
@@ -96,12 +174,15 @@ export interface SlackDownloadResponse extends ToolResponse {
 
 export interface SlackUpdateMessageResponse extends ToolResponse {
   output: {
+    // Legacy properties for backward compatibility
     content: string
     metadata: {
       channel: string
       timestamp: string
       text: string
     }
+    // New comprehensive message object
+    message: SlackMessage
   }
 }
 
diff --git a/apps/sim/tools/slack/update_message.ts b/apps/sim/tools/slack/update_message.ts
index c262878d08..27f197a36e 100644
--- a/apps/sim/tools/slack/update_message.ts
+++ b/apps/sim/tools/slack/update_message.ts
@@ -72,30 +72,21 @@ export const slackUpdateMessageTool: ToolConfig<
     const data = await response.json()
 
     if (!data.success) {
-      return {
-        success: false,
-        output: {
-          content: data.error || 'Failed to update message',
-          metadata: {
-            channel: '',
-            timestamp: '',
-            text: '',
-          },
-        },
-        error: data.error,
-      }
+      throw new Error(data.error || 'Failed to update message')
     }
 
     return {
       success: true,
-      output: {
-        content: data.output.content,
-        metadata: data.output.metadata,
-      },
+      output: data.output,
     }
   },
 
   outputs: {
+    message: {
+      type: 'object',
+      description: 'Complete updated message object with all properties returned by Slack',
+    },
+    // Legacy properties for backward compatibility
     content: { type: 'string', description: 'Success message' },
     metadata: {
       type: 'object',