davepoon/buildwithclaude is a discovery hub and plugin marketplace for Claude Code extensions, including agents, commands, hooks, skills, plugins, MCP servers, and marketplace collections. Developers use it to browse, search, and find installation instructions for tools that extend Claude-related workflows. Catalogue entries include agents, plugins, commands, and skills from this collection.
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 commands/davepoon/buildwithclaude/add-mutation-testinggit clone --depth 1 https://github.com/davepoon/buildwithclaudeWrote 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/commands/davepoon/buildwithclaude/add-mutation-testing)<a href="https://agentmods.dev/commands/davepoon/buildwithclaude/add-mutation-testing"><img src="https://agentmods.dev/badge/commands/davepoon/buildwithclaude/add-mutation-testing.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00006 | $0.00714 |
| Opus 5 | $0.00003 | $0.00357 |
| Sonnet 5 | $0.00001 | $0.00143 |
| Haiku 4.5 | $0.00001 | $0.00071 |
Grade A, and why
add-mutation-testing 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 today.
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 — 85 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Add Mutation Testing
Setup mutation testing for code quality
Instructions
-
Mutation Testing Strategy Analysis
- Analyze current test suite coverage and quality
- Identify critical code paths and business logic for mutation testing
- Assess existing testing infrastructure and CI/CD integration points
- Determine mutation testing scope and performance requirements
- Plan mutation testing integration with existing quality gates
-
Mutation Testing Tool Selection
- Choose appropriate mutation testing framework:
- JavaScript/TypeScript: Stryker, Mutode
- Java: PIT (Pitest), Major
- C#: Stryker.NET, VisualMutator
- Python: mutmut, Cosmic Ray, MutPy
- Go: go-mutesting, mut
- Rust: mutagen, cargo-mutants
- PHP: Infection
- Consider factors: language support, performance, CI integration, reporting
- Choose appropriate mutation testing framework:
-
Mutation Testing Configuration
- Install and configure mutation testing framework
- Set up mutation testing configuration files and settings
- Configure mutation operators and strategies
- Set up file and directory inclusion/exclusion rules
- Configure performance and timeout settings
-
Mutation Operator Configuration
- Configure arithmetic operator mutations (+, -, *, /, %)
- Set up relational operator mutations (<, >, <=, >=, ==, !=)
- Configure logical operator mutations (&&, ||, !)
- Set up conditional boundary mutations (< to <=, > to >=)
- Configure statement deletion and insertion mutations
-
Test Execution and Performance
- Configure mutation test execution strategy and parallelization
- Set up incremental mutation testing for large codebases
- Configure mutation testing timeouts and resource limits
- Set up mutation test caching and optimization
- Configure selective mutation testing for changed code
-
Quality Metrics and Thresholds
- Set up mutation score calculation and reporting
- Configure mutation testing thresholds and quality gates
- Set up mutation survival analysis and reporting
- Configure test effectiveness metrics and tracking
- Set up mutation testing trend analysis
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.
- today First seen · 85 lines · 6 tokens per session scan A 2041eabfe391
add-mutation-testing is a command published in the GitHub repository davepoon/buildwithclaude (3,415 stars, last pushed yesterday), licensed MIT. It adds 6 tokens to every session and 714 once invoked, about $0.0000 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 2026-09-05.
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