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counterexample-generator

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Generate concrete counterexamples when formal verification, assertions, or specifications fail. Use this skill when debugging failed proofs, understanding why verification fails, creating minimal reproducing examples, analyzing assertion violations, investigating invariant breaks, or diagnosing specification mismatches. Produces concrete input values, execution traces, and state information that demonstrate the failure.

skills/counterexample-generator/SKILL.md

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# Counterexample Generator

Systematically generate counterexamples that demonstrate why verification fails. Provides concrete input values, execution traces, and diagnostic information to help understand and fix specification or implementation issues.

## Core Capabilities

### 1. Precondition Violation Detection

Generate inputs that violate preconditions:
- **Invalid parameter values** - Out-of-range inputs
- **Null/undefined references** - Missing required objects
- **State violations** - Invalid object states
- **Type mismatches** - Incorrect types
- **Constraint violations** - Broken business rules