agentmods.dev

formengine

formengine is a cursor rule for Cursor from lukinov/ai-form-builder. It costs 0 tokens per session (1,701 once invoked), scanned A, original, MIT.

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

In plain words
What is it for?
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.
Why use it?
It turns a visual or textual form design into a validated schema and runnable React code while enforcing the structure FormEngine expects.

Cursor rule for Cursor

Written for Cursor: installed under .cursor/.

not rated 2repo 5mo ago A scan 0 tokens original MIT

Good fit 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.

Compare 6 cursor rules from other repositories ↓
Install with agentmods
npx agentmods add rules/lukinov/ai-form-builder/formengine
View source ↗ lukinov/ai-form-builder formengine.io
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.

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

Made for: Cursor.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for formengine

README.md
[![agentmods](https://agentmods.dev/badge/rules/lukinov/ai-form-builder/formengine/github.svg)](https://agentmods.dev/rules/lukinov/ai-form-builder/formengine)
Your own site
<a href="https://agentmods.dev/rules/lukinov/ai-form-builder/formengine"><img src="https://agentmods.dev/badge/rules/lukinov/ai-form-builder/formengine/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for formengine

Your own site · 80×15
<a href="https://agentmods.dev/rules/lukinov/ai-form-builder/formengine"><img src="https://agentmods.dev/badge/rules/lukinov/ai-form-builder/formengine.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
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. A grade says what 26 rules found in the file — not that it is safe.
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00000 $0.01701
Opus 5.5 $0.00000 $0.00680
Sonnet 5.5 $0.00000 $0.00340
Haiku 4.5 $0.00000 $0.00170

Measured 1mo ago against content hash f591e79df8df, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, 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 1mo ago.

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

  1. form.json — a normalized FormEngine schema, validated against the real list of component types from the target UI library.
  2. App.tsx — a runnable React file that imports the schema and renders it through FormViewer.
  3. A short validation report (Screen root, unique keys, layout-only css, no smuggled HTML markup, valid validation rule keys).
  4. 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.

  1. 1mo ago 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 5mo 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.

Claude CodeFrontendReactai-form-builderanthropic-skillclaude-code-pluginclaude-skillcursor-rules
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