Agent skill · software engineering · sundial-org
entr
Run arbitrary commands when files change. Useful for watching files and triggering builds or tests.
Why this skill is useful
Adds specific commands and usage patterns for the entr utility that the AI wouldn't reliably generate on its own.
What it needs
Requires entr installed locally. About 1k tokens when loaded. Last updated 2026-03-07. 639 stars on the source repository.
What this skill does
entr (Event Notify Test Runner) A utility for running arbitrary commands when files change. Usage entr takes a list of filenames from standard input and executes the utility specified as the first argument. Syntax Options -c: Clear the screen before invoking the utility. -r: Reload a persistent child process (e.g., a server). -s: Evaluate the first argument using the interpreter specified by SHELL. Examples Rebuild project when sources change: Run tests when JS files change: Auto-reload a Node server: Agent Notes entr blocks the terminal. When using it as an agent: 1. Use process tool to run it in the background if you need to do other things. 2. Or use it for a quick "watch mode" session where you intend to monitor output for a while.
How to use it
Reference it in AdaL, Claude Code, Cursor or any coding agent — nothing to install:
@skills sundial-org/entr