Monitor Tool - Claude Code

Monitor watches a process, file, or log stream in the background and pushes new output into the conversation as it arrives.

What it does

You hand Monitor a command or a file path and it keeps streaming. Each line of output becomes a notification Claude can react to. It's designed for the "until this condition is true" pattern - tail a deploy log until you see "ready", watch a test file for a green run, or poll a dev server's health endpoint.

When to use it

• Waiting on a deploy or CI job without wasting a sleep loop.
• Tailing a log for a specific event.
• Keeping eyes on a dev server while Claude works on other code.
• Long-running background work where polling would be wasteful.

Gotchas

• Monitor is in preview. Behavior may change between Claude Code releases.
• Very chatty output floods the conversation quickly. Filter at the source.
• Always stop the monitor when you're done or it burns context for nothing.

Official docs: https://code.claude.com/docs/en/tools-reference.md#monitor-tool