feat(web-shell): support text file attachments in the composer

packages/cli/src/acp-integration/session/Session.test.ts

@@ -6120,6 +6120,54 @@ describe('Session', () => {
       );
     });
 
+    it('embeds text file resource blocks as File reference parts', async () => {
+      mockChat.sendMessageStream = vi
+        .fn()
+        .mockResolvedValue(createEmptyStream());
+
+      await session.prompt({
+        sessionId: 'test-session-id',
+        prompt: [
+          {
+            type: 'text',
+            text: 'check this log\n\n@attachment:///app.log',
+          },
+          {
+            type: 'resource',
+            resource: {
+              uri: 'attachment:///app.log',
+              mimeType: 'text/plain',
+              text: 'line1\nline2',
+            },
+          },
+        ],
+      });
+
+      const sendMessageStream = mockChat.sendMessageStream as ReturnType<
+        typeof vi.fn
+      >;
+      const request = sendMessageStream.mock.calls[0]?.[1] as {
+        message: Array<Record<string, unknown>>;
+      };
+      const parts = request.message;
+      expect(
+        parts.some(
+          (p) =>
+            typeof p['text'] === 'string' &&
+            (p['text'] as string).includes(
+              'File: attachment:///app.log\nline1\nline2',
+            ),
+        ),
+      ).toBe(true);
+      expect(
+        parts.some(
+          (p) =>
+            typeof p['text'] === 'string' &&
+            (p['text'] as string).includes('@attachment:///app.log'),
+        ),
+      ).toBe(true);
+    });
+
     it('degrades an oversized inline image to a text placeholder before sending to the model', async () => {
       const ENV_KEY = 'QWEN_CODE_MAX_INLINE_MEDIA_BYTES';
       const original = process.env[ENV_KEY];

packages/sdk-typescript/src/daemon/ui/store.ts

@@ -62,8 +62,13 @@ export function createDaemonTranscriptStore(
       text: string,
       images?: Array<{ data: string; mimeType: string }>,
       meta?: DaemonTextDeltaMeta,
+      files?: Array<{ name: string; mimeType: string }>,
     ) {
-      state = appendLocalUserTranscriptMessage(state, text, { images, meta });
+      state = appendLocalUserTranscriptMessage(state, text, {
+        images,
+        meta,
+        files,
+      });
       scheduleNotify();
     },
     reset(nextSeed: Partial<DaemonTranscriptState> = {}) {

packages/sdk-typescript/src/daemon/ui/transcript.ts

@@ -104,6 +104,7 @@ export function appendLocalUserTranscriptMessage(
   text: string,
   opts: DaemonTranscriptReducerOptions & {
     images?: Array<{ data: string; mimeType: string }>;
+    files?: Array<{ name: string; mimeType: string }>;
     meta?: DaemonTextDeltaMeta;
   } = {},
 ): DaemonTranscriptState {
@@ -120,6 +121,9 @@ export function appendLocalUserTranscriptMessage(
   if (opts.images && opts.images.length > 0) {
     (block as DaemonTextTranscriptBlock).images = [...opts.images];
   }
+  if (opts.files && opts.files.length > 0) {
+    (block as DaemonTextTranscriptBlock).files = [...opts.files];
+  }
   appendBlock(next, block);
   next.activeUserBlockId = block.id;
   return trimTranscriptState(next);

packages/sdk-typescript/src/daemon/ui/types.ts

@@ -854,6 +854,13 @@ export interface DaemonTextTranscriptBlock extends DaemonTranscriptBlockBase {
   text: string;
   /** Images attached to this user message (base64 data URIs). */
   images?: Array<{ data: string; mimeType: string }>;
+  /**
+   * Text file attachments on this user message (display metadata only —
+   * the content rides the prompt's resource blocks and is never stored
+   * on the block). Local optimistic messages only; daemon replays carry
+   * no attachment metadata.
+   */
+  files?: Array<{ name: string; mimeType: string }>;
   streaming?: boolean;
   collapsed?: boolean;
   /** Used by the reducer for per-subAgent block routing; renderers may use it for nesting. */
@@ -1060,6 +1067,7 @@ export interface DaemonTranscriptStore {
     text: string,
     images?: Array<{ data: string; mimeType: string }>,
     meta?: DaemonTextDeltaMeta,
+    files?: Array<{ name: string; mimeType: string }>,
   ): void;
   reset(seed?: Partial<DaemonTranscriptState>): void;
   /**

packages/sdk-typescript/test/unit/daemonUi.test.ts

@@ -215,6 +215,20 @@ describe('daemon UI normalizer and transcript reducer', () => {
     });
   });
 
+  it('stores text file attachment metadata on local user messages', () => {
+    const store = createDaemonTranscriptStore();
+
+    store.appendLocalUserMessage('check this', undefined, undefined, [
+      { name: 'app.log', mimeType: 'text/plain' },
+    ]);
+
+    expect(store.getSnapshot().blocks[0]).toMatchObject({
+      kind: 'user',
+      text: 'check this',
+      files: [{ name: 'app.log', mimeType: 'text/plain' }],
+    });
+  });
+
   it('stores input annotations from replayed user message chunks', () => {
     const inputAnnotations = [
       {