Feature request: Built-in clipboard viewer for macOS/Windows

Summary

Claude Code should have a built-in ability to read clipboard contents (images, text, files, HTML, etc.) so users can easily share screenshots and other copied content without saving to a file first.

Motivation

Currently, there's no straightforward way to share a clipboard image (e.g., from macOS Shift+Cmd+4 configured to clipboard-only) with Claude Code. Users must either:

• Save the screenshot to a file manually, then reference it
• Build a custom skill to extract clipboard contents via osascript (macOS) or equivalent

This is a common workflow - users frequently want to show Claude a screenshot of an error, a UI, a browser page, or other visual context. A built-in clipboard viewer would significantly lower the friction.

Proposed Solution

Add a built-in /clipboard command (or equivalent) that:

1. Detects the clipboard content type (image, text, file reference, HTML, etc.)
2. Extracts and displays the content accordingly:

• Image: Save to temp file and display inline
• Text: Display directly
• File reference: Show file path (and optionally read the file)
• HTML: Convert and display as text

Platform Support

• macOS: osascript + clipboard info / pbpaste
• Windows: PowerShell Get-Clipboard
• Linux: xclip / xsel / wl-paste

Workaround

I've created a user-scoped custom skill (~/.claude/skills/clipboard/SKILL.md) that handles this for macOS, but this seems like a universally useful feature that would benefit all users out of the box.