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pact-invariants

Define Pact schema invariants and behavioral properties for smart-contract verification.

1|1|Updated Jun 9, 2026
Search Tags:#verification#model#invariants#pact#property-based-testing#defun#defschema
One-click install
npx skills add https://github.com/Pact-Community-Organization/github-marketplace --skill pact-invariants
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: pact-invariants
Source: https://github.com/Pact-Community-Organization/github-marketplace/tree/main/skills/pact-invariants
Command: npx skills add https://github.com/Pact-Community-Organization/github-marketplace --skill pact-invariants

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Pact invariants help teams decide which invariants and properties a module needs, guiding formal verification planning and ensuring contract correctness.

Core Features & Use Cases

  • Define data shape invariants with (invariant ...) tied to schemas.
  • Specify behavioral properties with (property ...) on defun and @model to enforce correctness.
  • Provide a reusable predicate (defproperty ...) for modular checks and ADR-style documentation.

Quick Start

Define a Pact module with a schema and attach an invariant and a property to enforce correctness.

Frequently Asked Questions about pact-invariants

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I verify Pact invariants for smart contracts?▼

To verify Pact invariants, you define data shape invariants tied to schemas and specify behavioral properties on defun using @model to enforce smart contract correctness.

What is the best way to attach properties to defun in a Pact module?▼

The best way to attach properties to defun in a Pact module is using the @model metadata to specify behavioral properties that enforce function correctness during verification.

How does property-based testing work with Pact schemas?▼

Property-based testing with Pact schemas works by attaching invariant checks directly to the schema definition, ensuring data shape correctness before function execution.

Can I create reusable predicates for modular checks across Pact modules?▼

Yes, you can create reusable predicates for modular checks across Pact modules by using defproperty, which also supports ADR-style documentation for formal verification planning.

When do I need formal verification planning for Pact smart contracts?▼

You need formal verification planning for Pact smart contracts when you must decide which data invariants and function behavior properties are required to guarantee contract correctness.

Does Pact property-based testing require external dependencies?▼

No, Pact property-based testing does not require external dependencies, utilizing built-in schema invariants, defun properties, and defproperty predicates for modular verification.

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