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 managedcode/dotnet-skills --skill xunitgit clone --depth 1 https://github.com/managedcode/dotnet-skillsWrote 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/managedcode/dotnet-skills/xunit)<a href="https://agentmods.dev/skills/managedcode/dotnet-skills/xunit"><img src="https://agentmods.dev/badge/skills/managedcode/dotnet-skills/xunit/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/managedcode/dotnet-skills/xunit"><img src="https://agentmods.dev/badge/skills/managedcode/dotnet-skills/xunit.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 | $0.00107 | $0.01470 |
| Opus 5.5 | $0.00043 | $0.00588 |
| Sonnet 5.5 | $0.00021 | $0.00294 |
| Haiku 4.5 | $0.00011 | $0.00147 |
Grade A, and why
xunit 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 1mo 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.
Copies of this mod
2 near-identical copies found in the catalogue:
- dotnet-xunit — 92% identical, 16 lines differ
- mcaf-dotnet-xunit — 89% identical, 14 lines differ
How it starts
The opening of the file, as written. The whole thing — 129 lines — stays where its author put it; the contents beside it link to each section on GitHub.
xUnit.net
Diagnostic Output Budget
Keep native test progress and ANSI visible; use the detected runner's supported flags (--progress on --ansi on for MTP/TUnit), not MTP switches on VSTest. Keep console logs at Warning or higher and one concise final summary. Do not replay progress redraws, successful-test output, or Information/Debug/Trace logs into model context. On failure/crash, show only the failing test/resource, root error, and relevant stack frames; deduplicate and cap each diagnostic response at 80 lines / 8 KiB. Never dump entire console/host/browser logs, HTML, TRX, or crash artifacts. Keep necessary artifacts size-bounded outside context, link them, and inspect exact bounded excerpts. Preserve the runner exit code through capture/filtering; disclose truncation. Silence alone does not establish a hang.
Trigger On
- the repo uses xUnit v2 or xUnit v3
- you need to add, run, debug, or repair xUnit tests
- the team is unsure whether a project is using VSTest or Microsoft.Testing.Platform
Value
- produce a concrete project delta: code, docs, config, tests, CI, or review artifact
- reduce ambiguity through explicit planning, verification, and final validation skills
- leave reusable project context so future tasks are faster and safer
Do Not Use For
- TUnit projects
- MSTest projects
- generic test strategy with no xUnit-specific mechanics
Inputs
- the nearest
AGENTS.md - the test project file and package references
- the active runner model for the test project
Quick Start
- Read the nearest
AGENTS.mdand confirm scope and constraints. - Run this skill's
Workflowthrough theRalph Loopuntil outcomes are acceptable. - Return the
Required Result Formatwith concrete artifacts and verification evidence.
Workflow
- Detect the active xUnit model before changing commands:
xunitusually means v2xunit.v3means v3xunit.runner.visualstudioplusMicrosoft.NET.Test.Sdkusually means VSTest compatibility is enabledTestingPlatformDotnetTestSupportorUseMicrosoftTestingPlatformRunnermeans Microsoft.Testing.Platform is in play
- Read the repo's real
testcommand fromAGENTS.md. If the repo has no explicit command yet, start withdotnet test PROJECT_OR_SOLUTION. - Keep the runner model consistent:
- xUnit v2 usually runs through VSTest
- xUnit v3 can run as a standalone executable with
dotnet run - xUnit v3 can also integrate with Microsoft.Testing.Platform
- do not mix VSTest-only switches into Microsoft.Testing.Platform runs
- Run the narrowest useful scope first:
- one project
- one class
- one trait
- one method
- Prefer
[Theory]for stable data-driven coverage and[Fact]for single-path invariant checks. - Keep
xunit.analyzersenabled when present. Fix analyzer findings instead of muting them casually.
What ships with it
4 files 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.
- 1mo ago Changed · +4 lines 79546f536612
- 1mo ago First seen · 125 lines · 107 tokens per session scan A 05bfb662f0c2
xunit is a skill published in the GitHub repository managedcode/dotnet-skills (495 stars, last pushed yesterday), licensed MIT. It adds 107 tokens to every session and 1,470 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.
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gherkin-gate
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