fix(deepagents): avoid non-standard 'file' content block for binary files#651
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fix(deepagents): avoid non-standard 'file' content block for binary files#651Robin (robinv8) wants to merge 3 commits into
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OpenAI-compatible providers such as DeepSeek reject the non-standard `type: "file"` content block produced by read_file for binary files (e.g. PDFs). Fall back to a text placeholder that preserves the MIME type and size metadata while keeping the request compatible. Fixes errors like: unknown variant `file`, expected `text` at line 1 column ...
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Problem
When a binary file (e.g. PDF, archive, executable) is read via the
read_filetool, the middleware returns a content block withtype: "file". This content block is not part of the OpenAI chat completions message format and is rejected by OpenAI-compatible providers such as DeepSeek:As a result, agents using these providers crash as soon as they encounter a non-media binary file.
Change
For binary files that are not image/audio/video, fall back to a
type: "text"placeholder that preserves the MIME type and byte size metadata, while omitting the base64 payload. Image/audio/video blocks continue to be returned as before because providers that support vision/audio understand those block types.Test coverage
Added two unit tests in
fs.test.ts:textplaceholder.imageblock.◇ injected env (0) from ../../.env // tip: ⌁ auth for agents [www.vestauth.com]
RUN v4.1.9 /private/tmp/deepagentsjs-fork/libs/deepagents
✓ src/middleware/fs.test.ts (61 tests) 25ms
Test Files 1 passed (1)
Tests 61 passed (61)
Type Errors no errors
Start at 11:28:19
Duration 324ms (transform 69ms, setup 0ms, import 242ms, tests 25ms, environment 0ms)
Checklist