[BUG/FEATURE] PreToolUse hook resolving path

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

The PreToolUse file_path tool input data is being resolved/normalised to an absolute path, making it impossible to get the original path information that was passed to the tool call. This wasn't the case in earlier versions of Claude Code.

What Should Happen?

In PreToolUse the actual tool input should be passed as the file_path value or at the very least add a property that preserves it.

Error Messages/Logs

Steps to Reproduce

Read("./p1-child-dir/../src/file.ts")

PreToolUse receives:

{
  "tool_input": { "file_path": "/home/claude/projects/p1/src/file.ts" }
}

❌ original path is GONE

PostToolUse receives:

{
  "tool_input": {  "file_path": "/home/claude/projects/p1/src/file.ts"},
  "tool_response": { "file": { "filePath": "./p1-child-dir/../src/file.ts" }
}

✅ original path is PRESERVED

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.143

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

Other

Additional Information

_No response_