[BUG] hookify fails with "Expecting ',' delimiter" on long PowerShell commands

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?

hookify plugin fails with JSON parse error when PowerShell tool receives long commands (e.g., inline JavaScript in node -e).

Error appears on every PreToolUse and PostToolUse hook invocation:
PreToolUse:PowerShell says: Hookify error: Expecting ',' delimiter: line 1 column 1326 (char 1325)
PostToolUse:PowerShell says: Hookify error: Expecting ',' delimiter: line 1 column 1327 (char 1326)

What Should Happen?

hookify should handle long JSON input gracefully, either by:

1. Truncating input before parsing
2. Catching JSONDecodeError and returning empty result
3. Increasing the stdin buffer size

Error Messages/Logs

Hookify error: Expecting ',' delimiter: line 1 column 1326 (char 1325)

Steps to Reproduce

1. Use PowerShell tool with long inline scripts (e.g., node -e "..." with 1000+ chars)
2. hookify PreToolUse/PostToolUse hooks fail with JSON parse error
3. Error appears in every tool call with long commands

Claude Model

Other

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.288

Platform

Other

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

The issue occurs because json.load(sys.stdin) in pretooluse.py and posttooluse.py fails when the input JSON is very long (typically >1000 chars). The error is caught by the generic exception handler, but the error message is confusing and appears on every tool call.

Related issues: #81448, #81670