[BUG] hooks don't run in headless mode

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?

I have setup a hook that is executed after each Read. It looks like this, and sits in my project's .claude/settings.local.json

{
  "hooks": {
    "PostToolUse": [
      {
        "matcher": "Read",
        "hooks": [
          {
            "type": "command",
            "command": "<COMMAND_HERE>"
          }
        ]
      }
    ]
  }
}

However, when I run Claude Code in "headless" mode (i.e., no user-facing terminal) or by emulating that with echo "Read a file from the repo and summarize it" | claude --dangerously-skip-permissions | cat, the hook is never executed.

What Should Happen?

When I run Claude Code in a regular terminal (e.g. echo "Read a file from the repo and summarize it" | claude --dangerously-skip-permissions), the GUI pops up and the hook is executed correctly, even showing up on both the GUI and the conversation logs.

I could not find any documentation about this, so I am not sure if this is expected or unexpected behavior. At the very least, to be able to make use of hooks in fully automated scenarios, there should be an option for enabling hooks in headless mode.

Error Messages/Logs

Steps to Reproduce

1. Add a hook like the one above
2. echo "Read a file from the repo and summarize it" | claude --dangerously-skip-permissions
3. echo "Read a file from the repo and summarize it" | claude --dangerously-skip-permissions | cat
4. Check log files for any hook_progress message

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.15

Platform

AWS Bedrock

Operating System

Other Linux

Terminal/Shell

Non-interactive/CI environment

Additional Information

_No response_