An agent that designs and writes automated tests for the Diffuse project using Swift Testing. Automated tests run code checks repeatedly to confirm that behavior still works after changes.

Use it to write domain tests, invariant tests, integration tests, and tests using fake components or fixed times, then run the project test and coverage commands.

It adds coverage for new behavior and bugs without changing fixtures just to make a test pass.

How hoangsonww/Diffuse-Native-Apps configures Claude Code

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/.claude/agents/test-writer.md

Clone the repo

git clone --depth 1 https://github.com/hoangsonww/Diffuse-Native-Apps

Made for: Claude Code.

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.

README.md

[![agentmods](https://agentmods.dev/badge/agents/hoangsonww/diffuse-native-apps/test-writer/github.svg)](https://agentmods.dev/agents/hoangsonww/diffuse-native-apps/test-writer)

Your own site

<a href="https://agentmods.dev/agents/hoangsonww/diffuse-native-apps/test-writer"><img src="https://agentmods.dev/badge/agents/hoangsonww/diffuse-native-apps/test-writer/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.

Your own site · 80×15

<a href="https://agentmods.dev/agents/hoangsonww/diffuse-native-apps/test-writer"><img src="https://agentmods.dev/badge/agents/hoangsonww/diffuse-native-apps/test-writer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 33 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 167 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.

Model	Per session	Once invoked
Fable 5.1	$0.00033	$0.00167
Opus 5.5	$0.00013	$0.00067
Sonnet 5.5	$0.00007	$0.00033
Haiku 4.5	$0.00003	$0.00017

Measured yesterday against content hash 10f69e2b9e5f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

test-writer 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.

.claude/agents/test-writer.md · 15 lines

What it actually says

You write tests for Diffuse.

Read Tests/AGENTS.md and skill write-tests.

Swift Testing (@Test / #expect). Use DiffuseTestSupport.
Example-based tests go in Tests/Domain. Invariants with SeededGenerator go in Tests/Invariants. Pipelines and golden fixtures stay in Tests/Integration.
Prefer fakes (FakeCapabilityFactory, FakeCollector) and FixedTimeSource.
After writing, run swift test --parallel and ./Scripts/coverage.sh.
Never edit Fixtures/ to make a test pass.

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.

yesterday First seen · 15 lines · 33 tokens per session scan A 10f69e2b9e5f

Subscribe to this mod's changes

test-writer is an agent published in the GitHub repository hoangsonww/Diffuse-Native-Apps (11 stars, last pushed 1mo ago), licensed MIT. It adds 33 tokens to every session and 167 once invoked, about $0.0001 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.

Testing Unit testing android device-monitoring gradle ios ipados jetpack-compose

test-writer next to 6 agents from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
test-writerhoangsonww/Diffuse-Native-Apps	Agent	11	1mo ago	MIT	A	33	Claude Code
unit-test-writerahmed3elshaer/everything-claude-code-mobile	Agent	66	4mo ago	MIT	A	58	Claude Code
m3-expressive-guideahmed3elshaer/everything-claude-code-mobile	Agent	66	4mo ago	MIT	A	54	Claude Code
network-implahmed3elshaer/everything-claude-code-mobile	Agent	66	4mo ago	MIT	A	58	Claude Code
deep-workerkvdm-co-pilot/create-cmp	Agent	0	17d ago	MIT	A	99	Claude Code
mobile-pr-deprecation-scannerAbdallah-Abdelazim/mobile-pr-review-plugin	Agent	1	2mo ago	MIT	A	134	Claude Code
playwright-test-generatormicrosoft/playwright	Agent	100k	today	Apache-2.0	A	151	Claude Code

Diffuse-Native-Apps: Agent for Claude Code