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Diffuse-Native-Apps: Skill for Claude Code

.agents/skills/write-tests/SKILL.md

write-tests is a skill for Claude Code, Codex from hoangsonww/Diffuse-Native-Apps. It costs 43 tokens per session (312 once invoked), scanned A, original, MIT.

A guide for adding automated tests with Swift Testing, Apple's framework for writing Swift tests. It explains where different kinds of tests belong and which commands to run afterward.

In plain words
What is it for?
Use it to add behavior tests, invariant tests for many inputs, integration tests, or package-level tests in a Swift project.
Why use it?
It helps ensure new behavior and bug fixes are checked consistently, without relying on live hardware or unstable timestamps and identifiers. It also helps tests catch real regressions instead of merely repeating the implementation.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: installed under .agents/ (shared by several agents).

This is hoangsonww/Diffuse-Native-Apps's own configuration. It tells Claude Code and Codex how to work on Diffuse-Native-Apps itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything Diffuse-Native-Apps configures →

not rated 11repo 1mo ago A scan 43 tokens original MIT
View source ↗ hoangsonww/Diffuse-Native-Apps hoangsonww.github.io
Reuse

Borrowing it

Nothing to install: this file belongs to hoangsonww/Diffuse-Native-Apps. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/hoangsonww/Diffuse-Native-Apps/master/.agents/skills/write-tests/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/hoangsonww/Diffuse-Native-Apps

Made for: Claude Code, Codex.

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.

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README.md
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Your own site
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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 write-tests

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Per session 43 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 312 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 $0.00043 $0.00312
Opus 5.5 $0.00017 $0.00125
Sonnet 5.5 $0.00009 $0.00062
Haiku 4.5 $0.00004 $0.00031

Measured yesterday against content hash 0c6ec5803d14, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

write-tests 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.

.agents/skills/write-tests/SKILL.md · 31 lines

What it actually says

Write tests

Swift Testing only (@Test, #expect, @Suite). No new XCTest modules.

Where it goes

Kind Path
Example-based public API Tests/Domain/
Seeded invariant ("for any input") Tests/Invariants/
Golden fixtures, live capture, pipelines Tests/Integration/
Package-private details Packages/<Name>/Tests/

DiffuseTestSupport (Tests/Support) has SnapshotBuilder, TestSchema, FakeCapabilityFactory, SeededGenerator, SnapshotSummary.stub, TemporaryLibrary.

Rules

  • Prefer fakes over live hardware. Integration live-capture tests are the exception.
  • Deterministic clocks (FixedTimeSource) and ids. No Date() or UUID() in assertions unless the test is specifically about allocation.
  • If you change collector schema, run skill fixtures and explain the diff.
  • After writing tests: swift test --parallel then ./Scripts/coverage.sh.

Shape

One behaviour per @Test with a sentence name ("Pinned snapshots survive the age window"). Invariants take arguments: of seeds and mention the seed in the failure message.

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. yesterday First seen · 31 lines · 43 tokens per session scan A 0c6ec5803d14

Subscribe to this mod's changes

write-tests is a skill published in the GitHub repository hoangsonww/Diffuse-Native-Apps (11 stars, last pushed 1mo ago), licensed MIT. It adds 43 tokens to every session and 312 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-11-07.

Testingandroiddevice-monitoringgradleiosipadosjetpack-compose
Related

write-tests compared with skills from other repositories

write-tests next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
write-testshoangsonww/Diffuse-Native-AppsSkill111mo agoMITA43Claude Code, Codex
motion-design-prokelvinkosbab/AppBootstrapAISkill8yesterdayMITA129Claude Code
android-adaptive-layout-prokelvinkosbab/AppBootstrapAISkill8yesterdayMITA147Claude Code
android-gradle-architecture-prokelvinkosbab/AppBootstrapAISkill8yesterdayMITA74Claude Code
r8-shrink-prokelvinkosbab/AppBootstrapAISkill8yesterdayMITA87Claude Code
xml-to-compose-migration-prokelvinkosbab/AppBootstrapAISkill8yesterdayMITA78Claude Code
swift-adaptive-layout-prokelvinkosbab/AppBootstrapAISkill8yesterdayMITA129Claude Code