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.
npx agentmods add rules/heegyeong/composesample/data-rulesgit clone --depth 1 https://github.com/HeeGyeong/ComposeSampleWhat 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 | $0.00352 |
| Opus 5 | $0.00000 | $0.00176 |
| Sonnet 5 | $0.00000 | $0.00070 |
| Haiku 4.5 | $0.00000 | $0.00035 |
Grade A, and why
data-rules 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.
What it actually says
description: "Data Class Implementation Rules for Android Development" globs: "" alwaysApply: true
Data Class Implementation Rules
Overview
This rule defines the implementation guidelines for data classes in the Android project. Follow the comprehensive guidelines from DataRules.md.
Key Rules
Naming Conventions
- File Pattern:
{Domain}Data.ktor{Domain}ListData.kt - Server fields: snake_case
- Client fields: camelCase
- Boolean flags: prefix with 'is' or 'has'
- YN flags: String type with "Y"/"N"
Required Structure
@Parcelize
data class ExampleData(
@SerializedName("server_field")
val clientField: Type? = defaultValue
) : Parcelable
Mandatory Annotations
- @SerializedName: REQUIRED for all API response fields
- @Parcelize: REQUIRED for Android component data transfer
Field Types
- Required fields: Non-null types
- Optional fields: Nullable types with defaults
- Collections: Empty collection defaults
Companion Objects
companion object {
val EMPTY = DataModel("")
val MOCK = DataModel("test_data")
}
Validation Requirements
- ALL fields must have @SerializedName
- Field names must match API spec exactly
- Default values for nullable fields
- Proper nullability handling
- Documentation for complex business logic
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 · 58 lines · 0 tokens per session scan A 01c2d5624cab
data-rules is a cursor rule published in the GitHub repository HeeGyeong/ComposeSample (11 stars, last pushed yesterday), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 352 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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