Overview
essentials.sh for developers and agents — free REST API, MCP server, and agent discovery. No keys, no signup.
Every generator on essentials.sh is also a free API and an MCP server. No keys, no signup, no rate cards — the same "nothing to configure" promise as the tools themselves.
What's here
- REST API — QR codes, meta tags, robots.txt, sitemaps, llms.txt, the email security check, and the site scanner over plain HTTP with JSON errors and an OpenAPI 3.1 spec.
- MCP server — the same generators as Model Context Protocol tools for Claude and other AI agents.
- Agent discovery — llms.txt, markdown negotiation, well-known catalogs, and DNS-AID records.
- Browser tools — deep-link parameters for every interactive tool.
- Dynamic QR codes — the own-your-redirect pattern, step by step.
- Scan checks — all 19 scanner checks, with fix recipes for the ones that need a change in your own site.
Principles
Everything is processed statelessly: API and MCP requests are not retained after the response, and the browser tools never upload your inputs anywhere. Questions or something broken? Get in touch.