fix: surface remaining paired evidence loss (#203)

src/channels/discord-attachments.ts

@@ -71,6 +71,15 @@ function formatAttachmentReference(
   return `[${label}: ${att.name || 'file'} → ${filePath}]`;
 }
 
+function formatUnavailableAttachmentReference(
+  label: 'Audio' | 'File' | 'Image' | 'Video',
+  att: Attachment,
+  filePath: string,
+  contentType: string,
+): string {
+  return `[${label} unavailable: ${att.name || 'file'} → ${filePath} — ${contentType} is not loaded as structured model input]`;
+}
+
 function formatBytes(bytes: number): string {
   return `${(bytes / (1024 * 1024)).toFixed(1)} MiB`;
 }
@@ -112,7 +121,15 @@ export async function describeDownloadedAttachment(
     attachmentDefaultExtension(contentType),
   );
   const reference = formatAttachmentReference(label, att, filePath);
-  if (!isTextAttachment(att, contentType)) return reference;
+  if (!isTextAttachment(att, contentType)) {
+    if (label === 'Image') return reference;
+    return formatUnavailableAttachmentReference(
+      label,
+      att,
+      filePath,
+      contentType,
+    );
+  }
 
   let text = fs.readFileSync(filePath, 'utf8');
   const MAX_TEXT_LENGTH = 32_000;

src/channels/discord.test.ts

@@ -648,7 +648,7 @@ describe('attachments', () => {
     );
   });
 
-  it('stores video attachment with local path', async () => {
+  it('stores video attachment with a visible unsupported marker', async () => {
     const opts = createTestOpts();
     const channel = new DiscordChannel('test-token', opts);
     await channel.connect();
@@ -674,12 +674,14 @@ describe('attachments', () => {
     expect(opts.onMessage).toHaveBeenCalledWith(
       'dc:1234567890123456',
       expect.objectContaining({
-        content: expect.stringMatching(/^\[Video: clip\.mp4 → .+\.mp4\]$/),
+        content: expect.stringMatching(
+          /^\[Video unavailable: clip\.mp4 → .+\.mp4 — video\/mp4 is not loaded as structured model input\]$/,
+        ),
       }),
     );
   });
 
-  it('stores file attachment with local path', async () => {
+  it('stores file attachment with a visible unsupported marker', async () => {
     const opts = createTestOpts();
     const channel = new DiscordChannel('test-token', opts);
     await channel.connect();
@@ -705,12 +707,14 @@ describe('attachments', () => {
     expect(opts.onMessage).toHaveBeenCalledWith(
       'dc:1234567890123456',
       expect.objectContaining({
-        content: expect.stringMatching(/^\[File: report\.pdf → .+\.pdf\]$/),
+        content: expect.stringMatching(
+          /^\[File unavailable: report\.pdf → .+\.pdf — application\/pdf is not loaded as structured model input\]$/,
+        ),
       }),
     );
   });
 
-  it('stores zip attachment with local path', async () => {
+  it('stores zip attachment with a visible unsupported marker', async () => {
     const opts = createTestOpts();
     const channel = new DiscordChannel('test-token', opts);
     await channel.connect();
@@ -737,7 +741,7 @@ describe('attachments', () => {
       'dc:1234567890123456',
       expect.objectContaining({
         content: expect.stringMatching(
-          /^\[File: display_latency_atopile_rev09\.zip → .+\.zip\]$/,
+          /^\[File unavailable: display_latency_atopile_rev09\.zip → .+\.zip — application\/zip is not loaded as structured model input\]$/,
         ),
       }),
     );