Latchkey CLI is a new platform tool that runs commands on fresh Linux machines from the terminal, eliminating the development loop of pushing code only to discover CI failures. It packs the local directory, uploads it to Latchkey, boots a clean Ubuntu runner, streams output live, and returns the command's exit code as the verdict. The CLI intelligently handles credentials and dependencies through .gitignore, built-in deny-lists, and .latchkeyignore files to prevent accidental secret uploads.