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 skills/managedcode/mcpgateway/mcaf-dotnet-xunitnpx skills add managedcode/MCPGateway --skill mcaf-dotnet-xunitgit clone --depth 1 https://github.com/managedcode/MCPGatewayWhat 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 | $0.00077 | $0.01237 |
| Opus 5 | $0.00039 | $0.00619 |
| Sonnet 5 | $0.00015 | $0.00247 |
| Haiku 4.5 | $0.00008 | $0.00124 |
Grade A, and why
mcaf-dotnet-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 2d 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 — 123 lines — stays where its author put it; the contents beside it link to each section on GitHub.
MCAF: .NET xUnit
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
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.
- 2d ago First seen · 123 lines · 77 tokens per session scan A eed59aa2387e
mcaf-dotnet-xunit is a skill published in the GitHub repository managedcode/MCPGateway (5 stars, last pushed 2d ago), licensed MIT. It adds 77 tokens to every session and 1,237 once invoked, about $0.0004 per session on Opus 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 2026-08-31.
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