[BUG] PreToolUse and PostToolUse hooks not triggering on WSL2 despite correct configuration

Do you see them detected when you run /hooks and navigate to PreToolUse or PostToolUse?

@ruslanvasylev check here
https://github.com/jackstine/claude_tools/tree/main/hooks

Confirming the same bug on macOS

I can confirm this exact same issue on macOS with the same symptoms:

Environment:

• Claude CLI version: 1.0.44 (Claude Code)
• Operating System: macOS
• Terminal: zsh with conda environment

Symptoms (identical to the original report):

• ✅ PreToolUse and PostToolUse hooks are NOT triggered despite correct configuration
• ✅ Notification hooks DO work perfectly (TTS, logging, etc.)
• ✅ Hook scripts execute successfully when run manually from command line
• ✅ Configuration is correct (verified multiple times through /hooks command)
• ✅ Scripts have proper permissions and are executable

Testing performed:

• Tested in multiple projects (both new and existing)
• Verified hook configuration through Claude's /hooks interface
• Confirmed hooks are properly saved in .claude/settings.local.json
• Manual execution of hook scripts works perfectly
• Tried both simple bash scripts and Python scripts with uv run
• Tested with both "*" and specific tool matchers

Key observation:
The fact that Notification hooks work but PreToolUse/PostToolUse don't suggests this is a specific bug in Claude Code 1.0.44's hook execution system for these particular hook types.

Workaround:
Currently using Notification hooks as a temporary solution since they function correctly.

This confirms the bug affects multiple platforms (WSL2/Linux and macOS), making it likely a core issue in Claude Code 1.0.44 rather than platform-specific.

I'm using 1.0.52 on WSL. The problem still exist.

{
  "hooks": {
    "Notification": [
    "PostToolUse": [
      {
        "matcher": "Edit|MultiEdit|Write",
        "hooks": [
          {
            "type": "command",
            "command": "if echo '$(.tool_input.file_path)' | grep -q '\\.js$'; then npx prettier --write '$(.tool_input.file_path)'; fi"
          }
        ]
      },
      {
        "matcher": "",
        "hooks": [
          {
            "type": "command",
            "command": "jq '.' >> ~/.claude/PostToolUse-logs.jsonl"
          }
        ]
      }
    ]
  }
}

The first example is copy from the doc here: https://docs.anthropic.com/en/docs/claude-code/hooks-guide#code-formatting-hook

{
  "hooks": {
    "PostToolUse": [
      {
        "matcher": "Edit|MultiEdit|Write",
        "hooks": [
          {
            "type": "command",
            "command": "if echo '$(.tool_input.file_path)' | grep -q '\\.js$'; then npx prettier --write '$(.tool_input.file_path)'; fi"
          }
        ]
      }
    ]
  }
}

The second one do works.

I give a second try.

{
  "hooks": {
    "PostToolUse": [
      {
        "matcher": "Edit|MultiEdit|Write",
        "hooks": [
          {
            "type": "command",
            "command": "if echo '$(.tool_input.file_path)' | grep -q '\\.js$'; then npx prettier --write '$(.tool_input.file_path)'; fi"
          },
          {
            "type": "command",
            "command": "jq '.' >> ~/.claude/PostToolUse-logs.jsonl"
          }
        ]
      }
    ]
  }
}

The second command works too. The first one still not run.

My third trial.

{
  "permissions": {
    "allow": [
      "Bash(echo:*)",
      "Bash(grep:*)",
      "Bash(npx prettier:*)"
    ],
    "deny": []
  },
  "hooks": {
    "PostToolUse": [
      {
        "matcher": "Edit|MultiEdit|Write",
        "hooks": [
          {
            "type": "command",
            "command": "if echo '$(.tool_input.file_path)' | grep -q '\\.ts$'; then npx prettier --write '$(.tool_input.file_path)'; fi"
          },
          {
            "type": "command",
            "command": "jq '.' >> ~/.claude/PostToolUse-logs.jsonl"
          }
        ]
      }
    ]
  }
}

The first command still not run.

I finally made it. This is the correct PostToolUse setup.

{
  "hooks": {
    "PostToolUse": [
      {
        "matcher": "Edit|MultiEdit|Write",
        "hooks": [
          {
            "type": "command",
            "command": "jq -r '.tool_input.file_path' | while read -r f; do case \"$f\" in *.js) npx prettier --write \"$f\";; esac; done"
          },
          {
            "type": "command",
            "command": "jq '.' >> ~/.claude/PostToolUse-logs.jsonl"
          }
        ]
      }
    ]
  }
}

The previous command I tried and copied form Claude Code doc is wrong. The behavior is the Claude Code piping the hook payload to the command. So that I have to read the pipe and complete the whole thing in one statement.

@ericharmeling Can you look at the doc example and see if it needs to be updated? $(.tool_input.file_path) syntax doesn't seem to work for everyone.

Same issue and fix as @doggy8088 here on v1.0.61 in WSL2. Thanks for the fix.

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