fix(amazon-bedrock): support document files in tool results

[aayush-kapoor]

Background

reported in #15319

alternate to #15361 with all signed commits + reproduction

the tool-result case 'file' branch only allows image media types, everything else throws
UnsupportedFunctionalityError. PDFs and other documents are unsupported, even though Bedrock's Converse API accepts documents.

Summary

tool-result file handling now mirrors user-message file handling:

• image tool-result files still convert to Bedrock image blocks
• non-image tool-result files now convert to Bedrock document blocks

Manual Verification

repro:

import { amazonBedrock } from '@ai-sdk/amazon-bedrock';
import { generateText, tool } from 'ai';
import { run } from '../../lib/run';
import { z } from 'zod';

function createPdfData(text: string): Uint8Array {
  const stream = `BT
/F1 24 Tf
72 720 Td
(${text}) Tj
ET`;

  const objects = [
    '<< /Type /Catalog /Pages 2 0 R >>',
    '<< /Type /Pages /Kids [3 0 R] /Count 1 >>',
    '<< /Type /Page /Parent 2 0 R /MediaBox [0 0 612 792] /Resources << /Font << /F1 4 0 R >> >> /Contents 5 0 R >>',
    '<< /Type /Font /Subtype /Type1 /BaseFont /Helvetica >>',
    `<< /Length ${stream.length} >>
stream
${stream}
endstream`,
  ];

  let pdf = '%PDF-1.4\n';
  const offsets = [0];

  for (const [index, object] of objects.entries()) {
    offsets.push(pdf.length);
    pdf += `${index + 1} 0 obj\n${object}\nendobj\n`;
  }

  const xrefOffset = pdf.length;
  pdf += `xref
0 ${objects.length + 1}
0000000000 65535 f 
${offsets
  .slice(1)
  .map(offset => `${offset.toString().padStart(10, '0')} 00000 n `)
  .join('\n')}
trailer
<< /Size ${objects.length + 1} /Root 1 0 R >>
startxref
${xrefOffset}
%%EOF`;

  return new TextEncoder().encode(pdf);
}

const pdfData = createPdfData('This PDF was returned by a tool result.');

run(async () => {
  const result = await generateText({
    model: amazonBedrock('us.anthropic.claude-sonnet-4-5-20250929-v1:0'),
    tools: {
      readDocument: tool({
        description: 'Read a PDF document',
        inputSchema: z.object({}),
        execute: async () => ({ ok: true }),
      }),
    },
    messages: [
      {
        role: 'user',
        content: 'Read the PDF returned by the tool.',
      },
      {
        role: 'assistant',
        content: [
          {
            type: 'tool-call',
            toolCallId: 'call-read-document',
            toolName: 'readDocument',
            input: {},
          },
        ],
      },
      {
        role: 'tool',
        content: [
          {
            type: 'tool-result',
            toolCallId: 'call-read-document',
            toolName: 'readDocument',
            output: {
              type: 'content',
              value: [
                {
                  type: 'file',
                  data: { type: 'data', data: pdfData },
                  mediaType: 'application/pdf',
                  filename: 'repro.pdf',
                },
              ],
            },
          },
        ],
      },
      {
        role: 'user',
        content: 'Summarize the PDF.',
      },
    ],
  });

  console.log(result.text);
});

Checklist

• All commits are signed (PRs with unsigned commits cannot be merged)
• Tests have been added / updated (for bug fixes / features)
• Documentation has been added / updated (for bug fixes / features)
• A patch changeset for relevant packages has been added (for bug fixes / features - run pnpm changeset in the project root)
• I have reviewed this pull request (self-review)

Related Issues

fixes #15319

Co-authored-by: Pragnyan Ramtha pragnyanramtha@gmail.com

[aayush-kapoor]

it needs an await since for handling docs/files in amazon bedrock, we use shouldEnableCitations which is async in nature

[github-actions]

⚠️ Backport to release-v6.0 created but has conflicts: #15626