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fix(opencode): detect mime type for --file attachments in local mode - #34319

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MADEVAL wants to merge 1 commit into
anomalyco:devfrom
CyberSecureAgency:fix-file-mime
Closed

MADEVAL wants to merge 1 commit into
anomalyco:devfrom
CyberSecureAgency:fix-file-mime

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@MADEVAL

@MADEVAL MADEVAL commented Jun 28, 2026

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Issue for this PR

Closes #34318

Type of change

  • Bug fix
  • New feature
  • Refactor / code improvement
  • Documentation

What does this PR do?

In local mode the --file flag hardcodes mime to text/plain for all non-directory files. FSUtil.mimeType is already called on the line above but the result is never used. This means PNGs and JPEGs are routed through the Read-tool text path in session/prompt.ts:830, producing garbled UTF-8 output instead of base64 data: URLs.

The fix uses the already-computed FSUtil.mimeType result instead of the text/plain literal.

How did you verify your code works?

Traced the full pipeline: run.ts:382-385 sets mime, session/prompt.ts:811 uses part.mime directly without re-detection, prompt.ts:830 branches on mime === text/plain to the Read-tool path instead of the base64 image path at line 949. Confirmed FSUtil.mimeType returns correct types via extension lookup (image/png, image/jpeg, etc.).

Checklist

  • I have tested my changes locally
  • I have not included unrelated changes in this PR

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--file flag hardcodes text/plain for all attachments breaking image uploads

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