fix(bedrock): strip file extensions from filename (#12971)

heiwen · aayush-kapoor · web-flow · commit 08336f15990b · 2026-03-02T22:18:20.000Z
## Background This PR normalizes Bedrock document names derived from part.filename by stripping file extensions before sending requests in order to avoid Bedrock throwing an exception. ## Summary - Added a shared stripFileExtension(filename: string) helper to @ai-sdk/provider-utils. - Exported the helper from provider-utils public index. - Updated Amazon Bedrock chat message conversion to use the helper for document name when part.filename is present. - Updated/added tests for Bedrock conversion behavior. - Added unit tests for the new helper. ## Manual Verfication <details> <summary> repro example:</summary> ```ts import { bedrock } from '@ai-sdk/amazon-bedrock'; import { generateText } from 'ai'; import fs from 'fs'; import { run } from '../../lib/run'; run(async () => { const result = await generateText({ model: bedrock('global.anthropic.claude-sonnet-4-5-20250929-v1:0'), messages: [ { role: 'user', content: [ { type: 'text', text: 'Summarize the content of this text file in a few sentences.', }, { type: 'file', data: fs.readFileSync('./data/error-message.txt'), mediaType: 'text/plain', filename: 'error-message.txt', }, ], }, ], }); console.log('Response:', result.text); console.log(); console.log('Finish reason:', result.finishReason); console.log('Usage:', result.usage); }); ``` </details> ## Checklist - [x] Tests have been added / updated (for bug fixes / features) - [ ] Documentation has been added / updated (for bug fixes / features) - [x] A _patch_ changeset for relevant packages has been added (for bug fixes / features - run `pnpm changeset` in the project root) - [x] I have reviewed this pull request (self-review) ## Future Work n/a ## Related Issues Fixes #11518 --------- Co-authored-by: Aayush Kapoor <aayushkapoor34@gmail.com> Co-authored-by: Aayush Kapoor <83492835+aayush-kapoor@users.noreply.github.com>
diff --git a/.changeset/twelve-chairs-work.md b/.changeset/twelve-chairs-work.md
@@ -0,0 +1,6 @@
+---
+'@ai-sdk/amazon-bedrock': patch
+'@ai-sdk/provider-utils': patch
+---
+
+fix(bedrock): strip file extensions from filename
diff --git a/packages/amazon-bedrock/src/convert-to-bedrock-chat-messages.test.ts b/packages/amazon-bedrock/src/convert-to-bedrock-chat-messages.test.ts
@@ -151,7 +151,7 @@ describe('user messages', () => {
     `);
   });
 
-  it('should be converted with actual filename when provided', async () => {
+  it('should strip file extension when filename is provided', async () => {
     const fileData = new Uint8Array([0, 1, 2, 3]);
 
     const { messages } = await convertToBedrockChatMessages([
@@ -163,7 +163,7 @@ describe('user messages', () => {
             type: 'file',
             data: Buffer.from(fileData).toString('base64'),
             mediaType: 'application/pdf',
-            filename: 'custom-filename',
+            filename: 'custom-filename.pdf',
           },
         ],
       },
@@ -192,6 +192,43 @@ describe('user messages', () => {
     `);
   });
 
+  it('should preserve filename without extension when provided', async () => {
+    const fileData = new Uint8Array([0, 1, 2, 3]);
+
+    const { messages } = await convertToBedrockChatMessages([
+      {
+        role: 'user',
+        content: [
+          {
+            type: 'file',
+            data: Buffer.from(fileData).toString('base64'),
+            mediaType: 'application/pdf',
+            filename: 'custom-filename',
+          },
+        ],
+      },
+    ]);
+
+    expect(messages).toMatchInlineSnapshot(`
+      [
+        {
+          "content": [
+            {
+              "document": {
+                "format": "pdf",
+                "name": "custom-filename",
+                "source": {
+                  "bytes": "AAECAw==",
+                },
+              },
+            },
+          ],
+          "role": "user",
+        },
+      ]
+    `);
+  });
+
   it('should use consistent document names for prompt cache effectiveness', async () => {
     const fileData1 = new Uint8Array([0, 1, 2, 3]);
     const fileData2 = new Uint8Array([4, 5, 6, 7]);
diff --git a/packages/amazon-bedrock/src/convert-to-bedrock-chat-messages.ts b/packages/amazon-bedrock/src/convert-to-bedrock-chat-messages.ts
@@ -5,7 +5,11 @@ import {
   SharedV3ProviderMetadata,
   UnsupportedFunctionalityError,
 } from '@ai-sdk/provider';
-import { convertToBase64, parseProviderOptions } from '@ai-sdk/provider-utils';
+import {
+  convertToBase64,
+  parseProviderOptions,
+  stripFileExtension,
+} from '@ai-sdk/provider-utils';
 import {
   BEDROCK_DOCUMENT_MIME_TYPES,
   BEDROCK_IMAGE_MIME_TYPES,
@@ -138,7 +142,9 @@ export async function convertToBedrockChatMessages(
                       bedrockContent.push({
                         document: {
                           format: getBedrockDocumentFormat(part.mediaType),
-                          name: part.filename ?? generateDocumentName(),
+                          name: part.filename
+                            ? stripFileExtension(part.filename)
+                            : generateDocumentName(),
                           source: { bytes: convertToBase64(part.data) },
                           ...(enableCitations && {
                             citations: { enabled: true },
diff --git a/packages/provider-utils/src/index.ts b/packages/provider-utils/src/index.ts
@@ -54,6 +54,7 @@ export {
   type Schema,
   type ValidationResult,
 } from './schema';
+export { stripFileExtension } from './strip-file-extension';
 export * from './uint8-utils';
 export * from './validate-types';
 export { VERSION } from './version';
diff --git a/packages/provider-utils/src/strip-file-extension.test.ts b/packages/provider-utils/src/strip-file-extension.test.ts
@@ -0,0 +1,20 @@
+import { describe, expect, it } from 'vitest';
+import { stripFileExtension } from './strip-file-extension';
+
+describe('stripFileExtension', () => {
+  it('should strip the extension from a filename', () => {
+    expect(stripFileExtension('report.pdf')).toBe('report');
+  });
+
+  it('should return the input when there is no extension', () => {
+    expect(stripFileExtension('report')).toBe('report');
+  });
+
+  it('should strip all extension segments for multi-dot filenames', () => {
+    expect(stripFileExtension('archive.tar.gz')).toBe('archive');
+  });
+
+  it('should strip a trailing dot', () => {
+    expect(stripFileExtension('report.')).toBe('report');
+  });
+});
diff --git a/packages/provider-utils/src/strip-file-extension.ts b/packages/provider-utils/src/strip-file-extension.ts
@@ -0,0 +1,13 @@
+/**
+ * Strips file extension segments from a filename.
+ *
+ * Examples:
+ * - "report.pdf" -> "report"
+ * - "archive.tar.gz" -> "archive"
+ * - "filename" -> "filename"
+ */
+export function stripFileExtension(filename: string): string {
+  const firstDotIndex = filename.indexOf('.');
+
+  return firstDotIndex === -1 ? filename : filename.slice(0, firstDotIndex);
+}
