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Trying to read an invalid image file bricks the session #9512
Description
Description
Hello! I found this bug by my application being dumb and writing some HTML to a .jpeg file. It breaks opencode, seemingly unrecoverably (other than by starting a new session).
Reproduction:
echo hello > /tmp/piccy.jpeg
opencode
# ask "what's in the image at /tmp/piccy.jpeg"
# "Could not process image"
# All prompts now get "Could not process image"Plugins
None
OpenCode version
1.1.25
Steps to reproduce
- Write some text to a file with extension ".jpeg"
- Ask opencode to look at it
Screenshot and/or share link
https://opncd.ai/share/XlzI18MI
Operating System
MacOS 26.1 (25B78), but also happens on node:24 docker image
Terminal
Ghostty, also sh in docker
Activity
github-actions commentedon Jan 19, 2026
This issue might be a duplicate of existing issues. Please check:
mmkal commentedon Jan 20, 2026
No, it's not a duplicate of that one.
GeneCodeSavvy commentedon Jan 21, 2026
I have opened a PR, and happy re-iterate for any changes
colinmollenhour commentedon Feb 7, 2026
It's slightly different for me - my image file was 0 bytes:
sameed-khan commentedon Feb 9, 2026
Adding that the same thing happens if the model reads an image that is too large (> 5MB)
fix(session): sanitize image attachments before sending to API
github-actions commentedon Apr 10, 2026
To stay organized issues are automatically closed after 90 days of no activity. If the issue is still relevant please open a new one.