New: 97,000+ skills indexed from GitHub repos with 100+ stars · every skill safety-checkedBrowse top skillsTop skills
Esc to closeBrowse all skills
Submit a skillBrowse skills
Submit a skillBrowse skills

Agent skill

Mcaf Dotnet Stryker

by managedcode in managedcode/Storage

Use the open-source free Stryker.NET mutation testing tool for .NET.

MITAuto-check passedTesting & QA

Install Mcaf Dotnet Stryker

skills CLI
$ npx skills add managedcode/Storage --skill mcaf-dotnet-stryker -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install managedcode/Storage mcaf-dotnet-stryker --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/managedcode/Storage.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.codex/skills/mcaf-dotnet-stryker .claude/skills/mcaf-dotnet-stryker && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
mcaf-dotnet-stryker
GitHub stars
138
Token cost
~946 tokens
SKILL.md length
481 words
Files
2 (incl. references)
Skills in repo
41
Repo updated
First seen
Licence
MIT

At a glance

Use the open-source free Stryker.NET mutation testing tool for .NET.

  • Works in 3 steps: Read the nearest AGENTS.md and confirm… → Run this skill's Workflow through the… → Return the Required Result Format with…
  • A repo needs to measure whether tests actually catch faults
  • SKILL.md covers Trigger On, Value, Do Not Use For and Inputs, plus 8 more sections
  • Calls dotnet and rg

What it does

Mcaf Dotnet Stryker is an agent skill from managedcode/Storage. Use the open-source free Stryker.NET mutation testing tool for .NET. Use when a repo needs to measure whether tests actually catch faults, especially in critical libraries or domains.

Its SKILL.md is about 950 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including reference files (for example `references/stryker.md`). Compatibility notes: Requires a .NET test project or solution; respects the repo's AGENTS.md commands first.

It sits in Testing & QA, covering Test coverage. It works with .NET. The repository describes itself as: Storage library provides a universal interface for accessing and manipulating data in different cloud blob storage providers. The licence is MIT.

When your agent uses it

  • A repo needs to measure whether tests actually catch faults
  • Especially in critical libraries

Example prompts

  • “/mcaf-dotnet-stryker”

Requirements

  • Compatibility (from SKILL.md): Requires a .NET test project or solution; respects the repo's `AGENTS.md` commands first.

Workflow steps

3 steps, taken from the first numbered list in SKILL.md.

  1. Read the nearest AGENTS.md and confirm scope and constraints.
  2. Run this skill's Workflow through the Ralph Loop until outcomes are acceptable.
  3. Return the Required Result Format with concrete artifacts and verification evidence.

What it can do on your machine

Read from SKILL.md and the folder at commit 5d32121. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • dotnet
    • rg

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

  • Compatibility

    Requires a .NET test project or solution; respects the repo's `AGENTS.md` commands first.

    From compatibility in the SKILL.md frontmatter.

Context cost

Mcaf Dotnet Stryker loads about 946 tokens when it runs, and up to ~1.2k if it reads all its reference files. Until then it costs about 51 tokens; SKILL.md has 481 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~51
When it runs · the whole SKILL.md, loaded when a task matches
~946
With references · SKILL.md plus every file in references/, read only if the agent opens them
~1.2k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from managedcode/Storage at commit 5d32121, republished under its MIT licence (© managedcode). 481 words, ~946 tokens.

Download SKILL.mdSave it as .claude/skills/mcaf-dotnet-stryker/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
mcaf-dotnet-stryker
description
Use the open-source free `Stryker.NET` mutation testing tool for .NET. Use when a repo needs to measure whether tests actually catch faults, especially in critical libraries or domains.
compatibility
Requires a .NET test project or solution; respects the repo's `AGENTS.md` commands first.

MCAF: .NET Stryker.NET

Trigger On

  • the repo uses or wants Stryker.NET
  • mutation testing is needed for high-risk code

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

  • every PR path by default in a large repo
  • simple coverage collection

Inputs

  • the nearest AGENTS.md
  • target projects and critical paths
  • time budget for mutation runs

Quick Start

  1. Read the nearest AGENTS.md and confirm scope and constraints.
  2. Run this skill's Workflow through the Ralph Loop until outcomes are acceptable.
  3. Return the Required Result Format with concrete artifacts and verification evidence.

Workflow

  1. Run mutation testing on critical projects, not blindly on the whole mono-repo.
  2. Keep it out of the fastest PR path unless the repo explicitly accepts the runtime cost.
  3. Stabilize tests first; mutation testing amplifies flaky or slow suites.

Bootstrap When Missing

If Stryker.NET is not configured yet:

  1. Detect current state:
    • rg --files -g '.config/dotnet-tools.json'
    • dotnet tool list --local
    • dotnet tool list --global
  2. Prefer local tool installation for reproducible CI:
    • dotnet new tool-manifest (if missing)
    • dotnet tool install dotnet-stryker
  3. Choose a focused target scope and mutation budget before enabling CI.
  4. Add a dedicated mutation command in AGENTS.md and CI (not in the fastest PR path by default).
  5. Run dotnet stryker on the target project and return status: configured or status: improved.
  6. If mutation testing is explicitly out of scope, return status: not_applicable.

Deliver

  • explicit mutation-test scope
  • reproducible Stryker commands

Validate

  • the selected scope is affordable in CI
  • mutation score is interpreted with test quality, not as a vanity number
Show full SKILL.md (193 more words)Show less

Ralph Loop

Use the Ralph Loop for every task, including docs, architecture, testing, and tooling work.

  1. Plan first (mandatory):
    • analyze current state
    • define target outcome, constraints, and risks
    • write a detailed execution plan
    • list final validation skills to run at the end, with order and reason
  2. Execute one planned step and produce a concrete delta.
  3. Review the result and capture findings with actionable next fixes.
  4. Apply fixes in small batches and rerun the relevant checks or review steps.
  5. Update the plan after each iteration.
  6. Repeat until outcomes are acceptable or only explicit exceptions remain.
  7. If a dependency is missing, bootstrap it or return status: not_applicable with explicit reason and fallback path.
Required Result Format
  • status: complete | clean | improved | configured | not_applicable | blocked
  • plan: concise plan and current iteration step
  • actions_taken: concrete changes made
  • validation_skills: final skills run, or skipped with reasons
  • verification: commands, checks, or review evidence summary
  • remaining: top unresolved items or none

For setup-only requests with no execution, return status: configured and exact next commands.

Load References

  • read references/stryker.md first

Example Requests

  • "Add Stryker for this library."
  • "Use mutation testing on our critical domain layer."

© managedcode, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 1 other file (references) in .codex/skills/mcaf-dotnet-stryker of managedcode/Storage.

  • SKILL.md
  • references/stryker.md

Open the folder on GitHubat commit 5d32121

Compare with similar skills

Mcaf Dotnet Stryker next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Mcaf Dotnet Stryker compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Mcaf Dotnet Stryker this skillmanagedcode/Storage138—~946Automated safety check: PassMIT
Strykermanagedcode/dotnet-skills486—~1kAutomated safety check: PassMIT
Evaluate PR Testsdotnet/maui23k—~2.9kAutomated safety check: PassMIT
Find Untested Sourcesdotnet/skills5.6k1 repos~3.3kAutomated safety check: PassMIT
Coverage Analysismicrosoft/testfx1k—~7.3kAutomated safety check: PassMIT
Coverage Analysisrunceel/ReactiveProperty944—~5.9kAutomated safety check: WarnMIT

Similar skills

  • Stryker

    managedcode/dotnet-skills

    Use the open-source free Stryker.NET mutation testing tool for .NET.

    486 GitHub stars~1k tokensUpdated today
    Testing & QAAuto-check passed

  • Evaluate PR Tests

    dotnet/maui

    Official

    Reviews the tests added in a pull request for fix coverage, quality, edge cases and test type, and recommends lighter test types where they would do.

    23k GitHub stars~2.9k tokensUpdated today
    Testing & QAAuto-check passed

  • Find Untested Sources

    dotnet/skills

    Official

    Statically pairs source files with test files to list code that no test references, using Roslyn for C# or tree-sitter for many languages, with no build.

    5.6k GitHub starsUsed in 1 repo~3.3k tokens
    Testing & QAAuto-check passed

  • Coverage Analysis

    microsoft/testfx

    Official

    Project-wide code coverage and CRAP (Change Risk Anti-Patterns) score analysis for .NET projects.

    1k GitHub stars~7.3k tokensUpdated today
    Testing & QAAuto-check passed

  • Coverage Analysis

    runceel/ReactiveProperty

    Automated, project-wide code coverage and CRAP (Change Risk Anti-Patterns) score analysis for .NET projects with existing unit tests.

    944 GitHub stars~5.9k tokensUpdated 1 mo ago
    Testing & QAAuto-check: warnings

  • Stryker Dotnet

    ardalis/RiverBooks

    Run Stryker.NET mutation testing against a specific .NET source file.

    134 GitHub stars~1.9k tokensUpdated yesterday
    Testing & QAAuto-check passed

More from managedcode/Storage

All 41 skills in this repo

  • Mcaf Adr Writing

    managedcode/Storage

    Create or update an ADR under docs/ADR/ for architectural decisions, dependency changes, data-model changes, or cross-cutting policy shifts.

    138 GitHub stars~951 tokensUpdated today
    Auto-check passed

  • Mcaf Agile Delivery

    managedcode/Storage

    Shape delivery workflow around backlog quality, roles, ceremonies, and engineering feedback.

    138 GitHub stars~883 tokensUpdated today
    Auto-check passed

  • Mcaf Architecture Overview

    managedcode/Storage

    Create or update docs/Architecture.md as the global architecture map for a solution.

    138 GitHub stars~950 tokensUpdated today
    Auto-check passed

  • Mcaf CI CD

    managedcode/Storage

    Design or refine CI/CD workflows, quality gates, release flow, and safe AI-assisted pipeline authoring.

    138 GitHub stars~981 tokensUpdated today
    Auto-check passed

  • Mcaf Code Review

    managedcode/Storage

    Prepare for, perform, or tighten code review workflow: PR scope, review checklist, reviewer expectations, and merge hygiene.

    138 GitHub stars~957 tokensUpdated today
    Auto-check passed

  • Mcaf Devex

    managedcode/Storage

    Improve developer experience for multi-component solutions: onboarding, F5 contract, cross-platform tasks, local inner loop, and reproducible setup.

    138 GitHub stars~911 tokensUpdated today
    Auto-check passed

Works with

Categories

Questions about Mcaf Dotnet Stryker

What does Mcaf Dotnet Stryker do?

Use the open-source free Stryker.NET mutation testing tool for .NET. Mcaf Dotnet Stryker is an agent skill from managedcode/Storage.NET.

When should I use Mcaf Dotnet Stryker?

Mcaf Dotnet Stryker fits situations like: A repo needs to measure whether tests actually catch faults; especially in critical libraries.

How do I install Mcaf Dotnet Stryker in Claude Code?

Run `npx skills add managedcode/Storage --skill mcaf-dotnet-stryker -a claude-code`. Or copy the skill folder (.codex/skills/mcaf-dotnet-stryker in managedcode/Storage) into .claude/skills/mcaf-dotnet-stryker in your project. Claude Code loads it when a task matches its description.

How do I install Mcaf Dotnet Stryker in Codex?

Run `npx skills add managedcode/Storage --skill mcaf-dotnet-stryker -a codex`. Or copy the skill folder (.codex/skills/mcaf-dotnet-stryker in managedcode/Storage) into .agents/skills/mcaf-dotnet-stryker in your project. Codex loads it when a task matches its description.

Can I use Mcaf Dotnet Stryker in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add managedcode/Storage --skill mcaf-dotnet-stryker -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/mcaf-dotnet-stryker, .gemini/skills/mcaf-dotnet-stryker, .github/skills/mcaf-dotnet-stryker and .opencode/skills/mcaf-dotnet-stryker in your project.

What does Mcaf Dotnet Stryker need to run?

Going by SKILL.md and its folder, Mcaf Dotnet Stryker needs the command-line tools its instructions call (dotnet and rg). Compatibility (from SKILL.md): Requires a .NET test project or solution; respects the repo's `AGENTS.md` commands first..

Does Mcaf Dotnet Stryker access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Mcaf Dotnet Stryker safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Mcaf Dotnet Stryker use?

Mcaf Dotnet Stryker is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Mcaf Dotnet Stryker use?

About 946 tokens (SKILL.md is roughly 3.8k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 220 tokens, read only when the agent opens those files.

What are the alternatives to Mcaf Dotnet Stryker?

Skills that share tags, products or a category with Mcaf Dotnet Stryker: Stryker (managedcode/dotnet-skills, 486 stars), Evaluate PR Tests (dotnet/maui, 23k stars), Find Untested Sources (dotnet/skills, 5.6k stars) and Coverage Analysis (microsoft/testfx, 1k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Mcaf Dotnet Stryker?

managedcode (a GitHub organization) maintains it in managedcode/Storage, which has 138 GitHub stars. The repository holds 41 skills in this directory. The repository was last updated on October 7, 2026.

Source: managedcode/Storage on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.