[FEATURE] Clickable file links in agent responses (OSC 8 for Write/Edit/Read output paths)

Problem Statement

When Claude Code references file paths in its responses — after writing, editing, or reading files — the paths are plain text. Users must manually copy them, use terminal hints, or visually scan to locate files. This is especially painful when:

• A session touches dozens of files across nested directories
• File paths are wrapped in ANSI color codes (breaks terminal regex matching)
• You want to quickly verify a file Claude just wrote or edited

Proposed Solution

Wrap file paths in agent responses with OSC 8 hyperlinks using the file:// URI scheme:

\033]8;;file:///C:/Users/user/project/src/auth.ts\033\src/auth.ts:142\033]8;;\033\

This would make every file path in Claude's output Ctrl+clickable (or Cmd+click on macOS) to open directly in the user's editor or file manager.

Where this applies

| Context | Example |
|---------|---------|
| Tool result summaries | "Updated src/auth.ts" → clickable |
| Code references in explanations | "The bug is in src/utils/parser.ts:42" → clickable |
| Write/Edit tool confirmations | File path in the tool output → clickable |
| Error messages with file paths | Stack traces, lint output → clickable paths |

Prior art

Modern CLI tools already emit OSC 8 file links:

• eza / exa (ls replacement)
• fd (find replacement)
• bat (cat replacement)
• delta (git diff viewer)

Relationship to existing issues

• #13008 — Original feature request for OSC 8 on file paths
• #26356 — OSC 8 regression in standalone terminals (links work in IDE terminals only)
• The statusline custom script path (file:// links in custom statusline) is also affected by #26356

Use case

I built a custom statusline with a PostToolUse hook that tracks every file Write/Edit during a session and displays them as clickable file:// links on a second statusline row. The hook and statusline work correctly, but the links aren't clickable due to #26356. Native support in agent responses would solve this at the source.

Platform

Windows 11, Windows Terminal, Claude Code 2.1.x