Field Guide 19: a prompt template that turns a component's contract, types, source and stories into a documentation page in the Field Guide 04 format, with 25 checks from inputs to publishing. Scripts compute the frontmatter and the API table from the contract; the model writes the prose from six tagged documents; an eval runs the Field Guide 04 linter and seven contract checks before a person reads the draft. The kit ships the prompt with 18 variables, a filler that writes a Messages API request (with an optional structured output schema), the eval, and a Button page generated from the filled prompt: the first reply fails one check with four open gaps, the page after one hand edit passes with none. Nothing in the kit calls a model.
When component pages are missing or stale and you want model-written drafts that cannot invent props, keyboard keys or links without a script noticing.