A rule set for generating React forms from screenshots, PDFs, HTML, or written descriptions using FormEngine, a JSON-based form renderer.

Use it to create signup, login, contact, onboarding, checkout, survey, or other React forms, including a schema, an App.tsx renderer, validation checks, and setup instructions.

It turns a visual or textual form design into a validated schema and runnable React code while enforcing the structure FormEngine expects.

formengine — Cursor rule by lukinov

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods

npx agentmods add rules/lukinov/ai-form-builder/formengine

Clone the repo

git clone --depth 1 https://github.com/lukinov/ai-form-builder

Made for: Cursor.

Per session 0 Nothing until a file matches its globs; then the whole rule loads.

When invoked 1,701 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5	$0.00000	$0.01701
Opus 5	$0.00000	$0.00851
Sonnet 5	$0.00000	$0.00340
Haiku 4.5	$0.00000	$0.00170

Measured yesterday against content hash f591e79df8df, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

formengine scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.cursor/rules/formengine.mdc · 162 lines

How it starts

The opening of the file, as written. The whole thing — 162 lines — stays where its author put it; the contents beside it link to each section on GitHub.

FormEngine — AI Form Builder

You generate FormEngine JSON schemas plus runnable React code. Default target is FormEngine Core (MIT, free) via @react-form-builder/core + @react-form-builder/components-rsuite.

What you produce — every time

form.json — a normalized FormEngine schema, validated against the real list of component types from the target UI library.
App.tsx — a runnable React file that imports the schema and renders it through FormViewer.
A short validation report (Screen root, unique keys, layout-only css, no smuggled HTML markup, valid validation rule keys).
Install command + a link to the Online FormBuilder so the user can tweak visually.

Hard rules — never violate

Schema invariants

Root is type: "Screen" (NOT "Form").
Every component node has key (unique within the tree), type (must exist in the chosen library), and usually props.
Every prop value is wrapped: "label": { "value": "Email" } — never "label": "Email".
Validations live under schema.validations on the field component that owns the data — never on the Screen root.
Use the correct tooltip/error types:
- RSuite: RsTooltip / RsErrorMessage
- MUI: MuiTooltip / MuiErrorWrapper
- Mantine: MtTooltip / MtErrorWrapper

Layout vs. styling

css and wrapperCss are layout-only — flex, grid, box-model, margin, padding, gap, width/height, alignment. Never color, font, background, border, shadow, radius, opacity, transform.
Visual styling belongs in the UI library's theme provider in App.tsx (<CustomProvider> / <ThemeProvider> / <MantineProvider>).
The legacy style field is forbidden — use css / wrapperCss.
The shape is { "any": { "object": { "<layout-key>": "<value>" } } }, never a plain CSS string.
No companion .css file alongside App.tsx. No root className. No <style> blocks. No styled-components.

Plain-text strings only

Read the full file on GitHub · 162 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

yesterday First seen · 162 lines · 0 tokens per session scan A f591e79df8df

Subscribe to this mod's changes

formengine is a cursor rule published in the GitHub repository lukinov/ai-form-builder (2 stars, last pushed 4mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 1,701 tokens. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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formengine