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 skills add StefanTheCode/dotnet-ai-toolkit --skill xunit-test-generatorgit clone --depth 1 https://github.com/StefanTheCode/dotnet-ai-toolkitWrote 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.
[](https://agentmods.dev/skills/stefanthecode/dotnet-ai-toolkit/xunit-test-generator)<a href="https://agentmods.dev/skills/stefanthecode/dotnet-ai-toolkit/xunit-test-generator"><img src="https://agentmods.dev/badge/skills/stefanthecode/dotnet-ai-toolkit/xunit-test-generator/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.
<a href="https://agentmods.dev/skills/stefanthecode/dotnet-ai-toolkit/xunit-test-generator"><img src="https://agentmods.dev/badge/skills/stefanthecode/dotnet-ai-toolkit/xunit-test-generator.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00099 | $0.01204 |
| Opus 5.5 | $0.00040 | $0.00482 |
| Sonnet 5.5 | $0.00020 | $0.00241 |
| Haiku 4.5 | $0.00010 | $0.00120 |
Grade A, and why
xunit-test-generator 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 2mo 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.
How it starts
The opening of the file, as written. The whole thing — 106 lines — stays where its author put it; the contents beside it link to each section on GitHub.
xUnit Test Generator
Write complete, compiling xUnit test classes for the supplied C# code — happy paths, edge cases, and failure cases — using AAA structure and proper mocking.
Input — point it at your code
You don't need pasted snippets. Accept any scope and figure out what to test yourself:
- A single class/file — generate tests for that type.
- A folder — generate (or fill gaps in) tests for every public type under it.
- A whole project or solution — find untested public types and prioritize the ones with real logic.
- A GitHub URL — clone first, then scan:
git clone --depth 1 <url> /tmp/repo && cd /tmp/repo
Discover targets and existing coverage with Glob/Grep/Bash, e.g.:
grep -rln "public class\|public record\|public sealed class" --include=*.cs <target> | grep -vi "/obj/\|/bin/\|Tests"
ls **/*Tests.cs 2>/dev/null # what's already covered / which test stack & libs they use
Match the project's existing test stack (mocking + assertion libs) by reading a current test file rather than asking. For a folder/project, list the types you'll cover and start with the highest-value ones. Skip trivial DTOs/POCOs. Always say which files you generated tests for.
When this runs
The user points at code to test — a class, a folder, a project, or a GitHub link — and wants unit tests. Default to NSubstitute + FluentAssertions, but if the project already uses Moq or built-in Assert, match it (detect from an existing test file). Only ask if there's no existing test project and the choice is genuinely ambiguous.
Workflow
- Read the unit under test. Identify public behavior, dependencies to mock, branches, and edge cases.
- Enumerate test cases before writing: happy path, each branch, boundary values, null/empty inputs, exception paths, and any business rule.
- Generate the test class — one logical assertion per test, descriptive names, AAA layout, mocked dependencies.
- Use
[Theory]with[InlineData]/[MemberData]for the same logic over many inputs instead of copy-pasted[Fact]s. - Call out gaps — anything not unit-testable (needs integration test, hits DB/HTTP) gets flagged, not faked.
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 2mo ago First seen · 106 lines · 99 tokens per session scan A 180636c7b6c3
xunit-test-generator is a skill published in the GitHub repository StefanTheCode/dotnet-ai-toolkit (26 stars, last pushed 2mo ago), licensed MIT. It adds 99 tokens to every session and 1,204 once invoked, about $0.0004 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 2026-09-03.
xunit-test-generator compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| xunit-test-generatorStefanTheCode/dotnet-ai-toolkit | Skill | 26 | 2mo ago | MIT | A | 99 | Claude Code |
| gke-compute-classesgoogle/skills | Skill | 22k | yesterday | Apache-2.0 | A | 83 | Claude Code, Codex |
| gke-reliabilitygoogle/skills | Skill | 22k | yesterday | Apache-2.0 | A | 85 | Claude Code, Codex |
| gke-workload-securitygoogle/skills | Skill | 22k | yesterday | Apache-2.0 | A | 171 | Claude Code, Codex |
| cloud-architectJeffallan/claude-skills | Skill | 12k | 7d ago | MIT | A | 71 | Claude Code |
| nemo-automodel-launcher-configNVIDIA/skills | Skill | 3.9k | yesterday | Apache-2.0 | A | 30 | Claude Code |
| azure-mgmt-botservice-dotnetmicrosoft/skills | Skill | 3.2k | yesterday | MIT | A | 78 | Claude Code |