From mutation-testing
Configures mewt/muton mutation testing campaigns by scoping targets, tuning timeouts, and optimizing runs for Rust, Go, TypeScript, and JavaScript codebases.
npx claudepluginhub trailofbits/skills --plugin mutation-testingThis skill is limited to using the following tools:
> **Note**: muton and mewt share identical interfaces but target different languages — mewt for general-purpose languages (Rust, Solidity, Go, TypeScript, JavaScript), muton for TON smart contracts (Tact, Tolk, FunC). All examples use `mewt` commands, but they work exactly the same with `muton`. File names change accordingly: `mewt.toml` → `muton.toml`, `mewt.sqlite` → `muton.sqlite`.
Runs mutation testing workflow: mutates source code, executes tests per mutation, identifies survivors, generates tests for them, commits per module. Multi-session progress tracking in .test-mutations.json.
Runs mutation testing on test suites using stack-specific tools like Stryker (JS), Infection (PHP), Mutmut (Python), and go-mutesting (Go) to validate test quality. Use for verifying test effectiveness.
Runs mutation testing to verify tests catch bugs by introducing mutants into code and checking if tests fail. Extends ATDD workflow as third validation after green acceptance and unit tests.
Share bugs, ideas, or general feedback.
Note: muton and mewt share identical interfaces but target different languages — mewt for general-purpose languages (Rust, Solidity, Go, TypeScript, JavaScript), muton for TON smart contracts (Tact, Tolk, FunC). All examples use
mewtcommands, but they work exactly the same withmuton. File names change accordingly:mewt.toml→muton.toml,mewt.sqlite→muton.sqlite.
Use this skill when the user:
mewt run and needs help getting set up firstDo not use this skill when the user:
Load workflows/configuration.md — a 5-phase guide from mewt init to a validated, ready-to-run campaign.
General question or unfamiliar command?
Run mewt --help or mewt <subcommand> --help, then assist.
| File | Content |
|---|---|
| workflows/configuration.md | 5-phase guide: init, scope, optimize, validate, run |
| references/optimization-strategies.md | Per-file targeting, two-phase campaigns, mutation type filtering |
# Initialize and mutate
mewt init # Create mewt.toml and mewt.sqlite
mewt mutate [paths] # Generate mutants without running tests
mewt run [paths] # Run the full campaign
# Inspect configuration and scope
mewt print config # View effective configuration
mewt print targets # Table of all targeted files
mewt print mutations --language [lang] # Available mutation types
mewt status # Mutant count and per-file breakdown
# Investigate specific mutants
mewt print mutants --target [path] # All mutants for a file
mewt print mutants --severity high # Filter by severity
mewt print mutant --id [id] # View mutated code diff
mewt test --ids [ids] # Re-test specific mutants