Evaluate PR Tests
dotnet/maui
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.
Run Stryker.NET mutation testing against a specific .NET source file.
Install Stryker Dotnet
$ npx skills add ardalis/RiverBooks --skill stryker-dotnet -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install ardalis/RiverBooks stryker-dotnet --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/ardalis/RiverBooks.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/stryker-dotnet .claude/skills/stryker-dotnet && rm -rf skills-srcUse ~/.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/
Install the "stryker-dotnet" agent skill from https://github.com/ardalis/RiverBooks/tree/main/.claude/skills/stryker-dotnet into .claude/skills/stryker-dotnet/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "stryker-dotnet", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/ardalis/RiverBooks/tree/main/.claude/skills/stryker-dotnetType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add ardalis/RiverBooks --skill stryker-dotnet -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install ardalis/RiverBooks stryker-dotnet --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ardalis/RiverBooks.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.claude/skills/stryker-dotnet .agents/skills/stryker-dotnet && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "stryker-dotnet" agent skill from https://github.com/ardalis/RiverBooks/tree/main/.claude/skills/stryker-dotnet into .agents/skills/stryker-dotnet/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "stryker-dotnet", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add ardalis/RiverBooks --skill stryker-dotnet -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install ardalis/RiverBooks stryker-dotnet --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ardalis/RiverBooks.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.claude/skills/stryker-dotnet .cursor/skills/stryker-dotnet && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "stryker-dotnet" agent skill from https://github.com/ardalis/RiverBooks/tree/main/.claude/skills/stryker-dotnet into .cursor/skills/stryker-dotnet/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "stryker-dotnet", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/ardalis/RiverBooks.git --path .claude/skills/stryker-dotnet--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add ardalis/RiverBooks --skill stryker-dotnet -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install ardalis/RiverBooks stryker-dotnet --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ardalis/RiverBooks.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.claude/skills/stryker-dotnet .gemini/skills/stryker-dotnet && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "stryker-dotnet" agent skill from https://github.com/ardalis/RiverBooks/tree/main/.claude/skills/stryker-dotnet into .gemini/skills/stryker-dotnet/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "stryker-dotnet", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install ardalis/RiverBooks stryker-dotnetInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add ardalis/RiverBooks --skill stryker-dotnet -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/ardalis/RiverBooks.git skills-src && mkdir -p .github/skills && cp -r skills-src/.claude/skills/stryker-dotnet .github/skills/stryker-dotnet && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "stryker-dotnet" agent skill from https://github.com/ardalis/RiverBooks/tree/main/.claude/skills/stryker-dotnet into .github/skills/stryker-dotnet/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "stryker-dotnet", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add ardalis/RiverBooks --skill stryker-dotnet -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install ardalis/RiverBooks stryker-dotnet --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ardalis/RiverBooks.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.claude/skills/stryker-dotnet .opencode/skills/stryker-dotnet && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "stryker-dotnet" agent skill from https://github.com/ardalis/RiverBooks/tree/main/.claude/skills/stryker-dotnet into .opencode/skills/stryker-dotnet/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "stryker-dotnet", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
stryker-dotnet- GitHub stars
- 135
- Token cost
- ~1.9k tokens
- SKILL.md length
- 497 words
- Files
- 1
- Skills in repo
- 3
- Repo updated
- First seen
- Licence
- None found
At a glance
Run Stryker.NET mutation testing against a specific .NET source file.
- Tasks that involve Test coverage
- SKILL.md covers When to Use This Skill, What Stryker Does, Installation and Detection, plus 8 more sections
- Calls dotnet
What it does
Stryker Dotnet is an agent skill from ardalis/RiverBooks. Run Stryker.NET mutation testing against a specific .NET source file. Covers installation (local tool), scoped invocation, JSON output parsing, and interpreting killed/survived results to decide pass/fail.
Its SKILL.md is about 1.9k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Testing & QA, covering Test coverage. It works with .NET. The repository describes itself as: Modular Monolith sample for Dometrain.
When your agent uses it
- Tasks that involve Test coverage
Example prompts
- “/stryker-dotnet”
What it can do on your machine
Read from SKILL.md and the folder at commit 94fa32a. 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
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.
Context cost
Stryker Dotnet loads about 1.9k tokens when it runs. Until then it costs about 55 tokens; SKILL.md has 497 words of instructions outside code blocks.
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
Without a licence we can't republish the file, so here is its outline and opening line. It has 497 words (~1,911 tokens).
- name
- stryker-dotnet
- invocable
- true
Files
Just SKILL.md in .claude/skills/stryker-dotnet of ardalis/RiverBooks.
Open the folder on GitHubat commit 94fa32a
Compare with similar skills
Stryker Dotnet 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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Stryker Dotnet this skillardalis/RiverBooks | 135 | — | ~1.9k | Automated safety check: Pass | None | |
| Evaluate PR Testsdotnet/maui | 23k | — | ~2.9k | Automated safety check: Pass | MIT | |
| Find Untested Sourcesdotnet/skills | 5.6k | 1 repos | ~3.3k | Automated safety check: Pass | MIT | |
| Coverage Analysismicrosoft/testfx | 1k | — | ~7.3k | Automated safety check: Pass | MIT | |
| Coverage Analysisrunceel/ReactiveProperty | 944 | — | ~5.9k | Automated safety check: Warn | MIT | |
| Coverage Analysis for .NETdotnet/skills | 5.6k | 1 repos | ~2.8k | Automated safety check: Pass | MIT |
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Project-wide code coverage and CRAP (Change Risk Anti-Patterns) score analysis for .NET projects.
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Crap Analysis
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Analyze code coverage and CRAP (Change Risk Anti-Patterns) scores to identify high-risk code.
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Related
Works with
Categories
Questions about Stryker Dotnet
What does Stryker Dotnet do?
Run Stryker.NET mutation testing against a specific .NET source file. Stryker Dotnet is an agent skill from ardalis/RiverBooks.NET source file.
When should I use Stryker Dotnet?
Stryker Dotnet fits situations like: tasks that involve Test coverage.
How do I install Stryker Dotnet in Claude Code?
Run `npx skills add ardalis/RiverBooks --skill stryker-dotnet -a claude-code`. Or copy the skill folder (.claude/skills/stryker-dotnet in ardalis/RiverBooks) into .claude/skills/stryker-dotnet in your project. Claude Code loads it when a task matches its description.
How do I install Stryker Dotnet in Codex?
Run `npx skills add ardalis/RiverBooks --skill stryker-dotnet -a codex`. Or copy the skill folder (.claude/skills/stryker-dotnet in ardalis/RiverBooks) into .agents/skills/stryker-dotnet in your project. Codex loads it when a task matches its description.
Can I use Stryker Dotnet 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 ardalis/RiverBooks --skill stryker-dotnet -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/stryker-dotnet, .gemini/skills/stryker-dotnet, .github/skills/stryker-dotnet and .opencode/skills/stryker-dotnet in your project.
What does Stryker Dotnet need to run?
Going by SKILL.md and its folder, Stryker Dotnet needs the command-line tools its instructions call (dotnet).
Does Stryker Dotnet 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 Stryker Dotnet 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 Stryker Dotnet use?
No licence was found for Stryker Dotnet or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
How many tokens does Stryker Dotnet use?
About 1.9k tokens (SKILL.md is roughly 7.6k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Stryker Dotnet?
Skills that share tags, products or a category with Stryker Dotnet: Evaluate PR Tests (dotnet/maui, 23k stars), Find Untested Sources (dotnet/skills, 5.6k stars), Coverage Analysis (microsoft/testfx, 1k stars) and Coverage Analysis (runceel/ReactiveProperty, 944 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Stryker Dotnet?
ardalis (a GitHub user) maintains it in ardalis/RiverBooks, which has 135 GitHub stars. The repository holds 3 skills in this directory. The repository was last updated on October 9, 2026.
Source: ardalis/RiverBooks on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.