Your .env.example Is Not a Schema. Here's a 400-Line Python CLI That Fixes That

A new Python CLI tool called envcheck validates .env files against a declarative YAML schema, catching common errors like invalid port numbers and email addresses. This tool addresses a common class of bug where .env.example files, which are often used as a convention but not a contract, fail to enforce schema rules. To use envcheck, simply run the tool and follow its instructions. envcheck is available on GitHub and can be used in CI pipelines to catch errors before deployment.