[BUG] Linux: JPEG clipboard image passes detection but saveImage only reads PNG/BMP, so Ctrl+V attaches nothing

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report
• [x] I am using the latest version of Claude Code

What's Wrong?

On Linux, pasting an image that the clipboard offers only as image/jpeg fails with a one-second No image found in clipboard. Use ctrl+v to paste images. notice, even though the image is there.

This is not #8324 (missing xclip/wl-paste): xclip is installed, and the same image re-copied as image/png pastes fine. It is the same class of bug as #89223 (WSLg/BMP): the detection step and the read step disagree on which formats are supported.

In the bundled Linux clipboard commands (v2.1.285), checkImage accepts any of these types in TARGETS:

xclip -selection clipboard -t TARGETS -o | grep -E "image/(png|jpeg|jpg|gif|webp|bmp)" \
  || wl-paste -l | grep -E "image/(png|jpeg|jpg|gif|webp|bmp)"

saveImage only ever asks for two of them:

xclip -selection clipboard -t image/png -o > <tmp>.png \
  || wl-paste --type image/png > <tmp>.png \
  || xclip -selection clipboard -t image/bmp -o > <tmp>.png \
  || wl-paste --type image/bmp > <tmp>.png

With a JPEG-only clipboard, checkImage says "image present", every link of saveImage exits non-zero, the text fallback finds no text/plain, and the user gets "No image found". image/gif and image/webp hit the same gap. Browsers, some image viewers and messaging apps put JPEG-only images on the clipboard, so this is easy to hit.

What Should Happen?

Any type checkImage accepts should be readable. Either fix works:

1. Extend the saveImage chain with image/jpeg, image/gif and image/webp links (writing the file with the matching extension, or transcoding to PNG).
2. Read whichever type matched in checkImage and transcode that to PNG.

Fix 2 also covers #89223 (BMP bytes written into a .png path).

Steps to Reproduce

Put a JPEG-only image on the X11 clipboard:

magick -size 10x10 xc:red jpg:- | xclip -selection clipboard -t image/jpeg -i
xclip -selection clipboard -t TARGETS -o   # -> image/jpeg, no image/png

1. Press Ctrl+V in the Claude Code prompt. "No image found in clipboard" flashes, nothing attaches.
2. Re-copy the same bytes as PNG and paste again:

xclip -selection clipboard -t image/jpeg -o | magick - png:- | xclip -selection clipboard -t image/png -i

Now Ctrl+V attaches the image.

Error Messages/Logs

No image found in clipboard. Use ctrl+v to paste images.

$ xclip -selection clipboard -t TARGETS -o
image/jpeg
TARGETS
MULTIPLE
TIMESTAMP
SAVE_TARGETS

$ xclip -selection clipboard -t image/png -o >/dev/null; echo exit=$?
exit=1

Environment

• Claude Code: 2.1.285 (native install, ~/.local/share/claude/versions/2.1.285)
• OS: Manjaro Linux, kernel 6.12.108
• Session: X11 (XDG_SESSION_TYPE=x11)
• Terminal: kitty (TERM=xterm-kitty)
• Shell: zsh
• xclip 0.13 and xsel installed; wl-paste not installed (not needed on X11)

Related

• #8324 — Linux paste not working (missing clipboard tool). Different cause.
• #89223 — WSLg: checkImage matches image/bmp, saveImage writes BMP bytes into a .png path. Same detection/read mismatch.