mutation-test-suite-optimizer

Optimize test suites using mutation testing to maximize mutation kill rate with minimal tests. Use when you need to reduce test suite size while maintaining quality, identify redundant tests, improve mutation coverage, or validate test effectiveness. The skill analyzes test coverage, execution intervals, and redundancy using mutation operators, selects or generates a minimal subset of tests that maximizes mutation kill rate, and outputs an optimized test suite with detailed reports showing killed and surviving mutants. Supports multiple programming languages and mutation testing frameworks.

1.96x

Quality

76%

Does it follow best practices?

Impact

100%

1.96x

Average score across 3 eval scenarios

Securityby

Passed

No known issues

Optimize this skill with Tessl

npx tessl skill review --optimize ./skills/mutation-test-suite-optimizer/SKILL.md

Evaluation results

100%

63%

Optimize a Bloated Python Test Suite

Mutation test suite optimization workflow

Criteria

Without context

With context

Uses optimize.py script

100%

Correct repo and test args

100%

Uses --operators flag

100%

Uses --output flag

100%

Report has original_tests field

25%

100%

Report has optimized_tests field

25%

100%

Report has mutation_kill_rate field

25%

100%

Report has killed_mutants field

28%

100%

Report has surviving_mutants field

100%

Report has time_savings field

28%

100%

Redundant tests identified

100%

High-value tests retained

100%

38%

Improve Test Coverage for a Data Validation Library

Surviving mutants guiding new tests

Criteria

Without context

With context

Uses optimize.py script

90%

100%

Produces report.json

87%

100%

Report has surviving_mutants

37%

100%

Report has killed_mutants

100%

Report has mutation_kill_rate

14%

100%

Report has original_tests and optimized_tests

100%

Report has time_savings

100%

Uses --operators flag

100%

New tests derived from surviving mutants

100%

Surviving mutant rationale documented

100%

Kill rate improves after new tests

100%

Mutation operators applied

62%

100%

45%

Speed Up CI/CD by Integrating Mutation-Based Test Optimization

CI/CD pipeline integration

Criteria

Without context

With context

Uses optimize.py script

90%

100%

Uses --tests argument

100%

Uses --operators flag

100%

Uses --output flag

100%

Report has all required fields

20%

100%

Redundant tests removed

90%

100%

Pipeline runs optimized suite

100%

Execution time improvement shown

50%

100%

Balances score and time

87%

100%

Periodic re-optimization configured

100%

Pipeline is self-contained

85%

100%

High-value tests prioritized

40%

100%

Repository: ArabelaTso/Skills-4-SE
Commit: 0f00a4f

Evaluated: 29 days ago
Agent: Claude Code
Model: Claude Sonnet 4.6

Table of Contents

Optimize a Bloated Python Test Suite Improve Test Coverage for a Data Validation Library Speed Up CI/CD by Integrating Mutation-Based Test Optimization

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