bug(bedrock): cachePoint on messages with document blocks causes "nothing available to cache" error #17300

Description

Description

When a user message contains a PDF file attachment, Bedrock returns:

ValidationException: There is nothing available to cache. 
Please remove the invalid cache point and try again.

This happens because applyCaching in ProviderTransform adds cachePoint to the last 2 non-system messages unconditionally.

Bedrock's DocumentBlock content (PDFs, CSVs, etc.) does not count toward cacheable tokens, so when a cachePoint lands on a message whose primary content is a document, Bedrock rejects the request with a 400 ValidationException.

Images work because ImageBlock content IS counted as cacheable.

Error

{
  "name": "APIError",
  "data": {
    "message": "There is nothing available to cache. Please remove the invalid cache point and try again.",
    "statusCode": 400,
    "responseBody": "{\"message\":\"There is nothing available to cache. Please remove the invalid cache point and try again.\"}"
  }
}

Endpoint: .../model/global.anthropic.claude-opus-4-6-v1/converse-stream

Steps to reproduce

1. Use any Bedrock Claude model
2. Send a message with a PDF file attached
3. Request fails with the above ValidationException

Root cause

packages/opencode/src/provider/transform.ts → applyCaching():

The function applies { bedrock: { cachePoint: { type: "default" } } } to the last 2 non-system messages regardless of content. Bedrock does not count DocumentBlock content as cacheable, so the cache point is invalid when it lands on a message whose content is primarily a document.

Proposed fix

Skip cachePoint for messages containing non-image file parts when targeting Bedrock:

for (const msg of unique([...system, ...final])) {
  if (
    model.providerID.includes("bedrock") &&
    Array.isArray(msg.content) &&
    msg.content.some(
      (part: any) =>
        part.type === "file" &&
        part.mediaType &&
        !part.mediaType.startsWith("image/")
    )
  ) {
    continue
  }
  // ... existing cache logic
}

Environment

• Provider: Amazon Bedrock (converse-stream)
• Model: global.anthropic.claude-opus-4-6-v1
• Region: ap-southeast-2 (global inference profile)

Plugins

No response

OpenCode version

1.2.21

Steps to reproduce

1. Configure a Bedrock Claude model (e.g. global.anthropic.claude-opus-4-6-v1)
2. Send a message with a PDF file attached (via the API parts array with type: "file", mime: "application/pdf", and a data: URL)
3. Request fails with ValidationException: "There is nothing available to cache. Please remove the invalid cache point and try again." (400)

Screenshot and/or share link

No response

Operating System

Linux (Ubuntu 22.04, kernel 6.8.0, x86_64, AWS)

Terminal

xterm-256color