{"slug": "show-hn-check-prefix-any-command-to-know-if-it-ll-work-before-you-run-it", "title": "Show HN: Check – prefix any command to know if it'll work before you run it", "summary": "Check is a new command-line tool that lets users prefix any command with 'check' to deterministically verify whether it will run successfully before execution, returning an exit code 0 or 1. The tool costs $0.04 per check with a prepaid balance that never expires, and works with any command that has a network target, including curl, wget, and python.", "body_md": "Prefix any command with `check`\n\nand get one word back. The command is either runnable or it isn't. That's it.\n\nWill this command produce a result? Check answers that question. Deterministically, at the speed of an API call, for four cents.\n\nPass any command. curl, wget, httpie, python, node — anything with a network target. From your terminal, a script, a pipeline, stdin, an AI agent — anywhere a command is generated before it's executed.\n\nRunnable or invalid. Exit code 0 or 1. No scores, no explanations, no opinions. A fact, not an assessment.\n\nReads from arguments or stdin. Returns an exit code. Works in bash, CI, Docker, cron, webhook chains — anywhere `sh`\n\nruns.\n\nCheck needs curl and a shell. You already have both.\n\n`CHECK_KEY`\n\nin your environment for CI and containers.Prepaid balance. No subscription. Never expires.\n\n$0.04 deducted per check. Your balance stays until you use it.", "url": "https://wpnews.pro/news/show-hn-check-prefix-any-command-to-know-if-it-ll-work-before-you-run-it", "canonical_source": "https://www.golproductions.com/check", "published_at": "2026-06-15 07:42:33+00:00", "updated_at": "2026-06-15 08:12:29.224577+00:00", "lang": "en", "topics": ["developer-tools", "ai-tools"], "entities": ["Check", "curl", "wget", "httpie", "python", "node", "bash", "Docker"], "alternates": {"html": "https://wpnews.pro/news/show-hn-check-prefix-any-command-to-know-if-it-ll-work-before-you-run-it", "markdown": "https://wpnews.pro/news/show-hn-check-prefix-any-command-to-know-if-it-ll-work-before-you-run-it.md", "text": "https://wpnews.pro/news/show-hn-check-prefix-any-command-to-know-if-it-ll-work-before-you-run-it.txt", "jsonld": "https://wpnews.pro/news/show-hn-check-prefix-any-command-to-know-if-it-ll-work-before-you-run-it.jsonld"}}