diff --git a/.changeset/visible-attachment-metadata.md b/.changeset/visible-attachment-metadata.md
new file mode 100644
index 000000000..a0d6689b1
--- /dev/null
+++ b/.changeset/visible-attachment-metadata.md
@@ -0,0 +1,5 @@
+---
+"@truefoundry/trueforge-ui": patch
+---
+
+Show file-type icons, filenames, and sizes for composer and sent message attachments.
diff --git a/packages/trueforge-ui/src/atoms/AttachmentCard.tsx b/packages/trueforge-ui/src/atoms/AttachmentCard.tsx
index 5ea2feec9..651446147 100644
--- a/packages/trueforge-ui/src/atoms/AttachmentCard.tsx
+++ b/packages/trueforge-ui/src/atoms/AttachmentCard.tsx
@@ -14,6 +14,7 @@ export type AttachmentCardSize = 'chip' | 'preview';
 export type AttachmentCardProps = {
   name: string;
   contentType?: string;
+  sizeBytes?: number;
   previewSrc?: string;
   isImage?: boolean;
   size?: AttachmentCardSize;
@@ -23,8 +24,35 @@ export type AttachmentCardProps = {
   className?: string;
 };
 
+const FILE_ICON_BY_EXTENSION: Record<string, string> = {
+  pdf: 'file-text',
+  ppt: 'file-text',
+  pptx: 'file-text',
+  doc: 'file-text',
+  docx: 'file-text',
+  txt: 'file-text',
+  csv: 'file-spreadsheet',
+  xls: 'file-spreadsheet',
+  xlsx: 'file-spreadsheet',
+  json: 'file-code',
+};
+
+export function getAttachmentFileIconName(name: string): string {
+  const dotIndex = name.lastIndexOf('.');
+  const extension = dotIndex > 0 && dotIndex < name.length - 1 ? name.slice(dotIndex + 1).toLowerCase() : undefined;
+  return extension == null ? 'file' : (FILE_ICON_BY_EXTENSION[extension] ?? 'file');
+}
+
+function formatFileSize(bytes: number): string {
+  if (bytes === 0) return '0 B';
+  const megabytes = bytes / (1024 * 1024);
+  if (megabytes < 1) return `${(bytes / 1024).toFixed(2)} KB`;
+  return `${megabytes.toFixed(2)} MB`;
+}
+
 export function AttachmentCard({
   name,
+  sizeBytes,
   previewSrc,
   isImage = false,
   size = 'chip',
@@ -50,24 +78,46 @@ export function AttachmentCard({
     );
   }
 
+  const imageChip = isImage && previewSrc != null;
+  const fileIcon = getAttachmentFileIconName(name);
+
   return (
     <div
       data-slot="aui_attachment-chip"
       style={previewRem != null ? { maxWidth: `${previewRem}rem` } : undefined}
-      className={cn('aui-attachment-chip relative size-14 shrink-0', className)}
+      className={cn(
+        'aui-attachment-chip relative shrink-0',
+        imageChip
+          ? 'size-14'
+          : 'bg-secondary-bg flex max-w-full min-w-0 items-center gap-3 rounded-lg border border-primary-button-bg/20 p-3',
+        !imageChip && onRemove != null && 'pe-10',
+        className,
+      )}
     >
-      <Tooltip content={name} side="top" triggerClassName="size-full">
-        <div className="bg-secondary-bg relative size-full overflow-hidden rounded-[calc(var(--composer-radius,1.5rem)-var(--composer-padding,8px))] border border-primary-button-bg/20">
-          <Avatar className="size-full rounded-none">
-            <AvatarImage src={isImage ? previewSrc : undefined} alt={name} className="object-cover" />
-            {/* bg-none drops the default gradient (bg-image group), which bg-secondary-bg alone would not override. */}
-            <AvatarFallback className="rounded-none bg-secondary-bg bg-none text-text-secondary">
-              <Icon name="file" size="1.5rem" className="text-text-secondary" />
-            </AvatarFallback>
-          </Avatar>
-        </div>
-      </Tooltip>
-      <span className="sr-only">{name}</span>
+      {imageChip ? (
+        <>
+          <div className="bg-secondary-bg relative size-full overflow-hidden rounded-[calc(var(--composer-radius,1.5rem)-var(--composer-padding,8px))] border border-primary-button-bg/20">
+            <Avatar className="size-full rounded-none">
+              <AvatarImage src={previewSrc} alt={name} className="object-cover" />
+              <AvatarFallback className="rounded-none bg-secondary-bg bg-none text-text-secondary">
+                <Icon name="file" size="1.5rem" className="text-text-secondary" />
+              </AvatarFallback>
+            </Avatar>
+          </div>
+        </>
+      ) : (
+        <>
+          <Icon name={fileIcon} size="2.5rem" className="text-text-secondary" />
+          <div className="flex min-w-0 flex-col gap-1">
+            <Tooltip content={name} side="top" triggerClassName="min-w-0">
+              <span className="text-text-primary min-w-0 truncate text-sm font-medium">{name}</span>
+            </Tooltip>
+            {sizeBytes != null ? (
+              <span className="text-text-secondary text-xs">{formatFileSize(sizeBytes)}</span>
+            ) : null}
+          </div>
+        </>
+      )}
       {onRemove && (
         <button
           type="button"
diff --git a/packages/trueforge-ui/src/containers/AttachmentsContainer.tsx b/packages/trueforge-ui/src/containers/AttachmentsContainer.tsx
index 96dbcf0a0..cff28edd1 100644
--- a/packages/trueforge-ui/src/containers/AttachmentsContainer.tsx
+++ b/packages/trueforge-ui/src/containers/AttachmentsContainer.tsx
@@ -6,6 +6,24 @@ import { USER_MESSAGE_ATTACHMENT_PREVIEW_REM } from '../constants/attachments.js
 import { useSlot } from '../theme/SlotsProvider.js';
 import { isImageAttachment, useAttachmentPreviewSrc } from './useAttachmentPreviewSrc.js';
 
+function base64DataUriByteSize(data: string): number | undefined {
+  const commaIndex = data.indexOf(',');
+  if (commaIndex < 0 || !data.slice(0, commaIndex).endsWith(';base64')) return undefined;
+
+  const payload = data.slice(commaIndex + 1).replace(/\s/g, '');
+  const padding = payload.endsWith('==') ? 2 : payload.endsWith('=') ? 1 : 0;
+  return Math.max(0, Math.floor((payload.length * 3) / 4) - padding);
+}
+
+function useAttachmentSizeBytes(): number | undefined {
+  const fileSize = useAuiState(s => ('file' in s.attachment ? s.attachment.file?.size : undefined));
+  const data = useAuiState(s => {
+    const filePart = s.attachment.content?.find(part => part.type === 'file');
+    return filePart?.type === 'file' ? filePart.data : undefined;
+  });
+  return fileSize ?? (data == null ? undefined : base64DataUriByteSize(data));
+}
+
 function ComposerAttachmentItem() {
   const AttachmentPreviewDialog = useSlot('AttachmentPreviewDialog');
   const AttachmentCard = useSlot('AttachmentCard');
@@ -15,12 +33,14 @@ function ComposerAttachmentItem() {
   const type = useAuiState(s => s.attachment.type);
   const isImage = isImageAttachment(type, contentType);
   const previewSrc = useAttachmentPreviewSrc();
+  const sizeBytes = useAttachmentSizeBytes();
 
   return (
     <AttachmentPreviewDialog previewSrc={previewSrc}>
       <AttachmentCard
         name={name}
         contentType={contentType}
+        sizeBytes={sizeBytes}
         previewSrc={previewSrc}
         isImage={isImage}
         size="chip"
@@ -38,11 +58,13 @@ function MessageAttachmentItem() {
   const type = useAuiState(s => s.attachment.type);
   const isImage = isImageAttachment(type, contentType);
   const previewSrc = useAttachmentPreviewSrc();
+  const sizeBytes = useAttachmentSizeBytes();
 
   const card = (
     <AttachmentCard
       name={name}
       contentType={contentType}
+      sizeBytes={sizeBytes}
       previewSrc={previewSrc}
       isImage={isImage}
       size={isImage ? 'preview' : 'chip'}
@@ -59,7 +81,7 @@ function MessageAttachmentItem() {
 
 export function ComposerAttachmentsContainer() {
   return (
-    <div className="aui-composer-attachments flex w-full flex-row flex-wrap items-center gap-2 empty:hidden">
+    <div className="aui-composer-attachments flex w-full min-w-0 flex-row flex-nowrap items-center gap-2 overflow-x-auto overflow-y-hidden empty:hidden">
       <ComposerPrimitive.Attachments>{() => <ComposerAttachmentItem />}</ComposerPrimitive.Attachments>
     </div>
   );
@@ -67,7 +89,7 @@ export function ComposerAttachmentsContainer() {
 
 export function MessageAttachmentsContainer() {
   return (
-    <div className="aui-user-message-attachments-end col-span-full col-start-1 row-start-1 flex w-full flex-row justify-end gap-2">
+    <div className="aui-user-message-attachments-end col-span-full col-start-1 row-start-1 flex w-full flex-row flex-wrap justify-end gap-2">
       <MessagePrimitive.Attachments>{() => <MessageAttachmentItem />}</MessagePrimitive.Attachments>
     </div>
   );
diff --git a/packages/trueforge-ui/src/icons/IconRegistry.tsx b/packages/trueforge-ui/src/icons/IconRegistry.tsx
index 0b779ef97..9a86d760b 100644
--- a/packages/trueforge-ui/src/icons/IconRegistry.tsx
+++ b/packages/trueforge-ui/src/icons/IconRegistry.tsx
@@ -28,6 +28,9 @@ import {
   EllipsisVertical,
   ExternalLink,
   File,
+  FileCode2,
+  FileSpreadsheet,
+  FileText,
   Github,
   GripVertical,
   History,
@@ -152,6 +155,9 @@ const defaults: Record<string, IconEntry> = {
   'chevrons-up-down': ChevronsUpDown,
   loader: Loader2,
   file: File,
+  'file-code': FileCode2,
+  'file-spreadsheet': FileSpreadsheet,
+  'file-text': FileText,
   clone: Copy,
   copy: Copy,
   'dollar-sign': DollarSign,
diff --git a/packages/trueforge-ui/test/atoms/AttachmentCard.test.tsx b/packages/trueforge-ui/test/atoms/AttachmentCard.test.tsx
index d4fd542af..f186aaa27 100644
--- a/packages/trueforge-ui/test/atoms/AttachmentCard.test.tsx
+++ b/packages/trueforge-ui/test/atoms/AttachmentCard.test.tsx
@@ -1,7 +1,7 @@
 import { fireEvent, render, screen } from '@testing-library/react';
 import { describe, expect, it, vi } from 'vitest';
 
-import { AttachmentCard } from '@/atoms/AttachmentCard.js';
+import { AttachmentCard, getAttachmentFileIconName } from '@/atoms/AttachmentCard.js';
 
 describe('AttachmentCard', () => {
   it('renders an image preview with accessible text and a configured size', () => {
@@ -30,6 +30,7 @@ describe('AttachmentCard', () => {
         previewSrc="/thumbnail.png"
         isImage
         previewRem={8}
+        sizeBytes={72}
         onRemove={onRemove}
       />,
     );
@@ -37,6 +38,8 @@ describe('AttachmentCard', () => {
     const chip = container.querySelector('[data-slot="aui_attachment-chip"]');
     expect(chip).toHaveStyle({ maxWidth: '8rem' });
     expect(screen.getByRole('img', { name: 'long-image-name.png' })).toHaveAttribute('src', '/thumbnail.png');
+    expect(screen.queryByText('long-image-name.png')).not.toBeInTheDocument();
+    expect(screen.queryByText('0.07 KB')).not.toBeInTheDocument();
 
     const removeButton = screen.getByRole('button', { name: 'Remove file' });
     expect(removeButton).toHaveAttribute('type', 'button');
@@ -45,12 +48,30 @@ describe('AttachmentCard', () => {
     expect(onRemove).toHaveBeenCalledOnce();
   });
 
-  it('falls back to a file chip when image preview data is unavailable', () => {
-    const { container } = render(<AttachmentCard name="report.pdf" contentType="application/pdf" isImage />);
+  it('renders visible file metadata when image preview data is unavailable', () => {
+    const { container } = render(
+      <AttachmentCard name="report.pdf" contentType="application/pdf" isImage sizeBytes={72} />,
+    );
 
     expect(container.querySelector('[data-slot="aui_attachment-chip"]')).toBeInTheDocument();
     expect(screen.getByText('report.pdf')).toBeInTheDocument();
+    expect(screen.getByText('0.07 KB')).toBeInTheDocument();
     expect(screen.queryByRole('img')).not.toBeInTheDocument();
     expect(screen.queryByRole('button', { name: 'Remove file' })).not.toBeInTheDocument();
   });
+
+  it.each([
+    ['report.pdf', 'file-text'],
+    ['slides.pptx', 'file-text'],
+    ['document.docx', 'file-text'],
+    ['notes.txt', 'file-text'],
+    ['results.csv', 'file-spreadsheet'],
+    ['workbook.xlsx', 'file-spreadsheet'],
+    ['config.json', 'file-code'],
+    ['bundle.zip', 'file'],
+    ['photo.png', 'file'],
+    ['attachment', 'file'],
+  ])('maps %s to the %s icon', (name, expectedIcon) => {
+    expect(getAttachmentFileIconName(name)).toBe(expectedIcon);
+  });
 });
diff --git a/packages/trueforge-ui/test/containers/AttachmentsContainer.test.tsx b/packages/trueforge-ui/test/containers/AttachmentsContainer.test.tsx
index d58a46e6f..4adc8ff0c 100644
--- a/packages/trueforge-ui/test/containers/AttachmentsContainer.test.tsx
+++ b/packages/trueforge-ui/test/containers/AttachmentsContainer.test.tsx
@@ -123,18 +123,18 @@ describe('attachment containers', () => {
     const file = new File(['image'], 'diagram.png', { type: 'image/png' });
     fireEvent.change(input, { target: { files: [file] } });
 
-    expect(await screen.findByText('diagram.png')).toBeInTheDocument();
     await waitFor(() => {
       expect(screen.getByTestId('attachment-preview-slot')).toHaveAttribute(
         'data-preview-src',
         'blob:composer-preview',
       );
     });
+    expect(screen.getByRole('img', { name: 'diagram.png' })).toBeInTheDocument();
 
     fireEvent.click(screen.getByRole('button', { name: 'Remove file' }));
 
     await waitFor(() => {
-      expect(screen.queryByText('diagram.png')).not.toBeInTheDocument();
+      expect(screen.queryByRole('img', { name: 'diagram.png' })).not.toBeInTheDocument();
     });
     expect(remove).toHaveBeenCalledTimes(1);
     expect(remove.mock.calls[0]?.[0]).toMatchObject({
@@ -144,6 +144,34 @@ describe('attachment containers', () => {
     });
   });
 
+  it('shows the staged file name and size', async () => {
+    const adapter = createAttachmentAdapter(async () => {});
+
+    render(
+      <AttachmentRuntimeHarness adapter={adapter}>
+        <ComposerAttachmentPickerContainer />
+        <ComposerAttachmentsContainer />
+      </AttachmentRuntimeHarness>,
+    );
+
+    fireEvent.click(screen.getByRole('button', { name: 'Add Attachment' }));
+    const input = document.querySelector<HTMLInputElement>('input[type="file"]');
+    if (input === null) {
+      throw new Error('Expected attachment file input');
+    }
+
+    const file = new File([new Uint8Array(2048)], 'report.pdf', { type: 'application/pdf' });
+    fireEvent.change(input, { target: { files: [file] } });
+
+    expect(await screen.findByText('report.pdf')).toBeInTheDocument();
+    expect(screen.getByText('2.00 KB')).toBeInTheDocument();
+    expect(document.querySelector('.aui-composer-attachments')).toHaveClass(
+      'flex-nowrap',
+      'overflow-x-auto',
+      'overflow-y-hidden',
+    );
+  });
+
   it('opens a full-size preview for a sent image attachment', () => {
     render(
       <RuntimeHarness
diff --git a/packages/trueforge-ui/test/containers/UserMessageContainer.test.tsx b/packages/trueforge-ui/test/containers/UserMessageContainer.test.tsx
index e61641669..678398364 100644
--- a/packages/trueforge-ui/test/containers/UserMessageContainer.test.tsx
+++ b/packages/trueforge-ui/test/containers/UserMessageContainer.test.tsx
@@ -52,6 +52,7 @@ describe('UserMessageContainer', () => {
   });
 
   it('renders a file attachment chip above the text bubble', () => {
+    const fileData = `data:application/pdf;base64,${btoa('x'.repeat(1024))}`;
     renderUserMessage([
       {
         role: 'user',
@@ -68,7 +69,7 @@ describe('UserMessageContainer', () => {
                 type: 'file',
                 mimeType: 'application/pdf',
                 filename: 'report.pdf',
-                data: 'data:application/pdf;base64,AAAA',
+                data: fileData,
               },
             ],
           },
@@ -78,6 +79,8 @@ describe('UserMessageContainer', () => {
     expect(screen.getByText('See attached')).toBeInTheDocument();
     const chip = screen.getByText('report.pdf').closest("[data-slot='aui_attachment-chip']");
     expect(chip).toHaveStyle({ maxWidth: '12rem' });
+    expect(screen.getByText('1.00 KB')).toBeInTheDocument();
+    expect(document.querySelector('.aui-user-message-attachments-end')).toHaveClass('flex-wrap');
   });
 
   it('shows the action bar when the thread is idle', () => {