modus-angular-checkbox-value-inversion-short

modus-angular-checkbox-value-inversion-short is a cursor rule for Cursor from julianoczkowski/create-trimble-app. It costs 294 tokens per session, scanned A, original, MIT.

A short rule set for testing Modus checkbox behavior in Angular. It documents a bug where the checkbox’s reported value is opposite to its actual checked state.

In plain words
What is it for?
Use it when handling checkbox events, writing an Angular checkbox wrapper, or verifying that checked and unchecked values are stored correctly.
Why use it?
It prevents application state from being reversed—for example, treating a checked box as unchecked—when handling the component’s change event.

Cursor rule for Cursor

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/julianoczkowski/create-trimble-app/modus-angular-checkbox-value-inversion-short
Clone the repo
git clone --depth 1 https://github.com/julianoczkowski/create-trimble-app

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 modus-angular-checkbox-value-inversion-short

README.md
[![agentmods](https://agentmods.dev/badge/rules/julianoczkowski/create-trimble-app/modus-angular-checkbox-value-inversion-short.svg)](https://agentmods.dev/rules/julianoczkowski/create-trimble-app/modus-angular-checkbox-value-inversion-short)
Your own site
<a href="https://agentmods.dev/rules/julianoczkowski/create-trimble-app/modus-angular-checkbox-value-inversion-short"><img src="https://agentmods.dev/badge/rules/julianoczkowski/create-trimble-app/modus-angular-checkbox-value-inversion-short.svg" alt="Measured on agentmods" height="20"></a>
Per session 294 This file is loaded in full into every session.
When invoked 294 The same file — it is already loaded in full.
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.

ModelPer sessionOnce invoked
Fable 5 $0.00294 $0.00294
Opus 5 $0.00147 $0.00147
Sonnet 5 $0.00059 $0.00059
Haiku 4.5 $0.00029 $0.00029

Measured 4d ago against content hash 3c306b6b0014, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

modus-angular-checkbox-value-inversion-short 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 4d 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.

templates/angular/.cursor/rules/modus-angular-checkbox-value-inversion-short.mdc · 37 lines

What it actually says

Modus Checkbox Value Inversion - Short

Critical bug fix for ModusWcCheckbox value property inversion.

Key Rules

  • Always invert checkbox value property - const actualChecked = !value from inputChange event
  • Use wrapper components - Create Angular wrapper to handle inversion automatically
  • Never trust the raw value - The value property is inverted (false when checked, true when unchecked)
  • Handle in event handlers - Invert value in (inputChange) event handler
  • Test thoroughly - Verify checkbox behavior matches expected state

Bug Details

  • When checkbox is checked: target.value returns false
  • When checkbox is unchecked: target.value returns true

Correct Pattern

handleChange(event: CustomEvent<InputEvent>): void {
  const value = (event.target as HTMLModusWcCheckboxElement).value;
  const actualChecked = !value; // CRITICAL: Always invert
  this.isChecked.set(actualChecked);
}

Reference

For detailed bug explanation, wrapper component patterns, and utility functions, fetch the full rule: modus-angular-checkbox-value-inversion

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. 4d ago First seen · 37 lines · 294 tokens per session scan A 3c306b6b0014

Subscribe to this mod's changes

modus-angular-checkbox-value-inversion-short is a cursor rule published in the GitHub repository julianoczkowski/create-trimble-app (3 stars, last pushed 2mo ago), licensed MIT. It adds 294 tokens to every session, about $0.0015 per session on Opus 5. 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.