Agent skill

Crap Analysis

Analyze code coverage and CRAP (Change Risk Anti-Patterns) scores to identify high-risk code.

No licenceAuto-check passedTesting & QA

Install Crap Analysis

skills CLI

$ npx skills add ardalis/RiverBooks --skill crap-analysis -a claude-code

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

GitHub CLI

$ gh skill install ardalis/RiverBooks crap-analysis --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/ardalis/RiverBooks.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/crap-analysis .claude/skills/crap-analysis && 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/

Paste into Claude Code

Install the "crap-analysis" agent skill from https://github.com/ardalis/RiverBooks/tree/main/.claude/skills/crap-analysis into .claude/skills/crap-analysis/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "crap-analysis", 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

$skill-installer install https://github.com/ardalis/RiverBooks/tree/main/.claude/skills/crap-analysis

Type 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.

skills CLI

$ npx skills add ardalis/RiverBooks --skill crap-analysis -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install ardalis/RiverBooks crap-analysis --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/ardalis/RiverBooks.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.claude/skills/crap-analysis .agents/skills/crap-analysis && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "crap-analysis" agent skill from https://github.com/ardalis/RiverBooks/tree/main/.claude/skills/crap-analysis into .agents/skills/crap-analysis/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "crap-analysis", 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.

skills CLI

$ npx skills add ardalis/RiverBooks --skill crap-analysis -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install ardalis/RiverBooks crap-analysis --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/ardalis/RiverBooks.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.claude/skills/crap-analysis .cursor/skills/crap-analysis && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "crap-analysis" agent skill from https://github.com/ardalis/RiverBooks/tree/main/.claude/skills/crap-analysis into .cursor/skills/crap-analysis/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "crap-analysis", 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

$ gemini skills install https://github.com/ardalis/RiverBooks.git --path .claude/skills/crap-analysis

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add ardalis/RiverBooks --skill crap-analysis -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install ardalis/RiverBooks crap-analysis --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/ardalis/RiverBooks.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.claude/skills/crap-analysis .gemini/skills/crap-analysis && rm -rf skills-src

Use ~/.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/

Paste into Gemini CLI

Install the "crap-analysis" agent skill from https://github.com/ardalis/RiverBooks/tree/main/.claude/skills/crap-analysis into .gemini/skills/crap-analysis/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "crap-analysis", 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.

GitHub CLI

$ gh skill install ardalis/RiverBooks crap-analysis

Installs 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).

skills CLI

$ npx skills add ardalis/RiverBooks --skill crap-analysis -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/ardalis/RiverBooks.git skills-src && mkdir -p .github/skills && cp -r skills-src/.claude/skills/crap-analysis .github/skills/crap-analysis && rm -rf skills-src

Use ~/.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/

Paste into GitHub Copilot

Install the "crap-analysis" agent skill from https://github.com/ardalis/RiverBooks/tree/main/.claude/skills/crap-analysis into .github/skills/crap-analysis/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "crap-analysis", 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.

skills CLI

$ npx skills add ardalis/RiverBooks --skill crap-analysis -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install ardalis/RiverBooks crap-analysis --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/ardalis/RiverBooks.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.claude/skills/crap-analysis .opencode/skills/crap-analysis && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "crap-analysis" agent skill from https://github.com/ardalis/RiverBooks/tree/main/.claude/skills/crap-analysis into .opencode/skills/crap-analysis/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "crap-analysis", 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: crap-analysis
GitHub stars: 135
Used in: 2 other repos
Token cost: ~3.4k tokens
SKILL.md length: 658 words
Files: 1
Skills in repo: 3
Repo updated: Oct 7, 2026
First seen: Oct 7, 2026
Licence: None found

At a glance

Analyze code coverage and CRAP (Change Risk Anti-Patterns) scores to identify high-risk code.

Tasks that involve Test coverage
SKILL.md covers When to Use This Skill, What is CRAP?, Coverage Collection Setup and ReportGenerator Installation, plus 8 more sections
Calls dotnet

What it does

Crap Analysis is an agent skill from ardalis/RiverBooks. Analyze code coverage and CRAP (Change Risk Anti-Patterns) scores to identify high-risk code. Use OpenCover format with ReportGenerator for Risk Hotspots showing cyclomatic complexity and untested code paths.

Its SKILL.md is about 3.4k 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. The repository describes itself as: Modular Monolith sample for Dometrain.

When your agent uses it

Tasks that involve Test coverage

Example prompts

“/crap-analysis”

What it can do on your machine

Read from SKILL.md and the folder at commit 5e225f0. 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
Links to these hosts (documentation or services it may open):
- github.com
- artima.com
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

Crap Analysis loads about 3.4k tokens when it runs. Until then it costs about 56 tokens; SKILL.md has 658 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~56
When it runs · the whole SKILL.md, loaded when a task matches: ~3.4k

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 658 words (~3,351 tokens).

name: crap-analysis
invocable: true

Outline of SKILL.md

CRAP Score Analysis
When to Use This Skill
What is CRAP?
Why CRAP Matters
CRAP Score Examples
Coverage Collection Setup
coverage.runsettings
Key Configuration Options
ReportGenerator Installation
Add to .config/dotnet-tools.json
Or Install Globally
Collecting Coverage
Run Tests with Coverage Collection
Generate HTML Report
Report Types
Reading the Report
Risk Hotspots Section
Interpreting Results
Coverage Thresholds
Recommended Standards
Configuring Thresholds
CI/CD Integration
GitHub Actions
Azure Pipelines
Quick Reference
One-Liner Commands
Project Standards
What Gets Excluded
When to Update Thresholds
Additional Resources

Read the full SKILL.md on GitHub

Files

Just SKILL.md in .claude/skills/crap-analysis of ardalis/RiverBooks.

Open the folder on GitHubat commit 5e225f0

Used in 2 other repositories

We found 2 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 2 other GitHub owners. This page covers the copy in ardalis/RiverBooks, which our catalogue first saw on October 7, 2026.

Compare with similar skills

Crap Analysis 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.

Crap Analysis compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Crap Analysis this skillardalis/RiverBooks	135	2 repos	~3.4k	Automated safety check: Pass	None	today
Requirementsrizsotto/Bear	6.5k	—	~2k	Automated safety check: Pass	GPL-3.0	yesterday
Code Coverages3s-project/s3s	311	—	~789	Automated safety check: Pass	Apache-2.0	today
Project Statusbactopia/bactopia	522	—	~787	Automated safety check: Pass	MIT	2 mo ago
Check Coverageldayton/Dippy	243	—	~403	Automated safety check: Pass	MIT	3 mo ago
Guarding Destructive Operationskajisho5/ffmpeg-skill	1.9k	—	~2.6k	Automated safety check: Pass	MIT	3 days ago

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Questions about Crap Analysis

What does Crap Analysis do?

Analyze code coverage and CRAP (Change Risk Anti-Patterns) scores to identify high-risk code. Crap Analysis is an agent skill from ardalis/RiverBooks. Analyze code coverage and CRAP (Change Risk Anti-Patterns) scores to identify high-risk code.

When should I use Crap Analysis?

Crap Analysis fits situations like: tasks that involve Test coverage.

How do I install Crap Analysis in Claude Code?

Run `npx skills add ardalis/RiverBooks --skill crap-analysis -a claude-code`. Or copy the skill folder (.claude/skills/crap-analysis in ardalis/RiverBooks) into .claude/skills/crap-analysis in your project. Claude Code loads it when a task matches its description.

How do I install Crap Analysis in Codex?

Run `npx skills add ardalis/RiverBooks --skill crap-analysis -a codex`. Or copy the skill folder (.claude/skills/crap-analysis in ardalis/RiverBooks) into .agents/skills/crap-analysis in your project. Codex loads it when a task matches its description.

Can I use Crap Analysis 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 crap-analysis -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/crap-analysis, .gemini/skills/crap-analysis, .github/skills/crap-analysis and .opencode/skills/crap-analysis in your project.

What does Crap Analysis need to run?

Going by SKILL.md and its folder, Crap Analysis needs the command-line tools its instructions call (dotnet).

Does Crap Analysis access the network?

SKILL.md names 2 domains. As links in the text: github.com and artima.com. This is read from the text; nothing was executed.

Is Crap Analysis 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 Crap Analysis use?

No licence was found for Crap Analysis or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.

How many tokens does Crap Analysis use?

About 3.4k tokens (SKILL.md is roughly 13k 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 Crap Analysis?

Skills that share tags, products or a category with Crap Analysis: Requirements (rizsotto/Bear, 6.5k stars), Code Coverage (s3s-project/s3s, 311 stars), Project Status (bactopia/bactopia, 522 stars) and Check Coverage (ldayton/Dippy, 243 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Crap Analysis?

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 7, 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.

Crap Analysis

Install Crap Analysis

Facts

At a glance

What it does

When your agent uses it

Example prompts

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Files

Used in 2 other repositories

Compare with similar skills

Similar skills

Requirements

Code Coverage

Project Status

Check Coverage

Guarding Destructive Operations

Atdd Mutate

More from ardalis/RiverBooks

Stryker Dotnet

Test Authoring

Questions about Crap Analysis

Install Crap Analysis

Facts

At a glance

What it does

When your agent uses it

Example prompts

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Files

Used in 2 other repositories

Compare with similar skills

Similar skills

More from ardalis/RiverBooks

Related

Questions about Crap Analysis