invariant-analysis

Extract and analyze smart contract protocol invariants to identify violation paths.

60|18|Updated Jan 21, 2026
One-click install
npx skills add https://github.com/PurpleAILAB/Vigilo --skill invariant-analysis-purpleailab
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: invariant-analysis
Source: https://github.com/PurpleAILAB/Vigilo/tree/main/packages/claude/skills/protocol-analysis/invariant-analysis
Command: npx skills add https://github.com/PurpleAILAB/Vigilo --skill invariant-analysis-purpleailab

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) and scripts (resource) components.

What problem does it solve?

This Skill systematically identifies critical conditions that must always hold true in a smart contract protocol and explores ways these conditions can be violated, uncovering potential vulnerabilities.

Core Features & Use Cases

  • Invariant Extraction: Identifies explicit (from code/docs) and implicit (inferred from code flow) invariants.
  • Violation Path Exploration: Simulates scenarios to break invariants, including single-function, multi-function, state transition, and edge-case violations.
  • Use Case: Auditing a DeFi lending protocol to ensure that the invariant totalBorrowed <= totalDeposited * utilizationCap cannot be broken, preventing users from borrowing more than is available or allowed.

Quick Start

Analyze the provided smart contract code to extract all protocol invariants and identify potential violation paths.

Frequently Asked Questions about invariant-analysis

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

FAQPage Schema
What is smart contract invariant analysis in protocol security auditing?

To extract protocol invariants from smart contract code, analyze the code and documentation to identify explicit conditions and infer implicit invariants from code flow. This process maps state variable relationships to establish conditions that must always hold true within the protocol.

How do I find violation paths for smart contract invariants during a security audit?

Finding violation paths involves simulating scenarios to break smart contract invariants, including single-function, multi-function, state transition, and edge-case violations. This systematic exploration uncovers potential vulnerabilities by testing if critical protocol conditions can be violated.

Can I use invariant analysis to audit DeFi lending protocols and prevent overborrowing vulnerabilities?

Yes, you can use invariant analysis to audit DeFi lending protocols by verifying that conditions like totalBorrowed <= totalDeposited * utilizationCap cannot be broken. This prevents users from borrowing more than is available or allowed, ensuring protocol security.

Does invariant analysis work with NFT and other blockchain protocols beyond DeFi?

Yes, invariant analysis applies to security auditing and vulnerability discovery in DeFi, NFTs, and other blockchain protocols. It requires code analysis, state variable relationship mapping, and simulation of violation scenarios to identify potential security issues across various protocol types.

What are the limitations of protocol invariant analysis for smart contract vulnerability discovery?

Protocol invariant analysis requires thorough code analysis, state variable relationship mapping, and violation scenario simulation. It is limited by the accuracy of extracting both explicit and implicit invariants, and may not cover all edge-case violations if the documentation or code flow is incomplete.