[FEATURE]:Pasted images use data: URL instead of file path, breaking MCP tools for non-vision models

[zhengwh]

Feature hasn't been suggested before.

• I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

Problem

When pasting an image from clipboard, OpenCode stores it as a data: URL (base64).
This works for vision models (GLM-4.6V), but non-vision models (GLM-5) need to
call MCP tools (look_at, understand_image) which expect file paths, not data URLs.

Expected Behavior

Pasted images should be saved to a temp file, and the url field should contain
the file path so MCP tools can access them.

Workaround

Use @filename to reference files already in the working directory.

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• [FEATURE]:Clipboard image pasting not supported with GLM-4.7 model + ZAI MCP in OpenCode #7341: Clipboard image pasting not supported with GLM model + ZAI MCP in OpenCode — same combination of GLM model + MCP tool failing when images are pasted from clipboard
• Crash on Windows when pasting images from clipboard (ERR_INVALID_URL_SCHEME) #12547: Crash on Windows when pasting images from clipboard (ERR_INVALID_URL_SCHEME) — directly related to the data: URL scheme being used for clipboard images, causing scheme-related errors when tools expect file paths

[zhengwh]

os:
mac os M1
opencode desktop