What is api-ui-binding?

A set of coding rules for connecting an API to a Compose user interface using the MVVM pattern, where view models hold app data and actions. It covers data objects, API interfaces, API calls, error handling, and displaying results.

Use it when adding an API endpoint, creating matching data classes, connecting calls to a view model, or rendering API results in a Compose app.

It gives developers a consistent way to connect server data to screens without scattering network logic through the interface.

api-ui-binding — Cursor rule by HeeGyeong

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/heegyeong/composesample/api-ui-binding

Clone the repo

git clone --depth 1 https://github.com/HeeGyeong/ComposeSample

Made for: Cursor.

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

When invoked 433 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	$0.00433
Opus 5	$0.00000	$0.00217
Sonnet 5	$0.00000	$0.00087
Haiku 4.5	$0.00000	$0.00043

Measured 2d ago against content hash 7b519d930886, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

api-ui-binding 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 2d 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/api-ui-binding.mdc · 60 lines

What it actually says

description: "API and UI Binding Creation using MVVM and Material3" globs: "" alwaysApply: true

API and UI Binding Creation Rules

Overview

This rule explains the steps to add APIs using MVVM architecture and connect data to UI following Material3 guidelines. Reference the detailed guide from CreateAPIAndUIBindingGuide.md.

Requirements

1. DTO Creation

Generate DTOs that match API documentation
Follow data class implementation rules from DataRules.md

2. API Interface

Add API call functions within already declared API interfaces
Create new interfaces only when no appropriate existing interface exists
Use proper naming and organization

3. API Call Function Implementation

Implement API call functions that match API documentation
Use proper HTTP methods and endpoints
Include error handling and response processing

4. ViewModel Integration

Add API call functions to appropriate ViewModel
Store data through API calls via ViewModel
Render UI with stored data
Follow ViewModel patterns from DIRules.md

Constraints

Import: Use import statements after checking existing versions
Responsiveness: Ensure code responsiveness

Expected Results

API Interface

API functions added to API interface

ViewModel

API call functions exist in appropriate ViewModel
Data stored after API calls

UI Rendering

UI rendered with stored data
Follow UI guidelines from UIRules.md

Additional Guidelines

Follow MVVM architecture and Material3 guidelines
Implement according to existing project patterns and rules
Maintain consistency across the codebase

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.

2d ago First seen · 60 lines · 0 tokens per session scan A 7b519d930886

Subscribe to this mod's changes

api-ui-binding is a cursor rule published in the GitHub repository HeeGyeong/ComposeSample (11 stars, last pushed 2d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 433 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 2026-08-30.

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api-ui-binding