Plu-Stan Expands Cardano Smart Contract Checks

Input Output’s Cardano High Assurance team has delivered what the company describes as the first stable release of Plu-Stan. The development report for September 11, 2026, announces additional checks for common mistakes in decentralized application development, alongside an updated Visual Studio Code extension.

Plu-Stan Reviews Plinth Smart Contracts

Plu-Stan is a static analysis tool for Cardano smart contracts written in Plinth, a Haskell-based language. Built on the Stan analyzer, it examines code for patterns associated with security weaknesses and higher script execution costs.

The tool identifies specific code locations for review and provides recommendations to help developers investigate potential problems before deploying their contracts. Its rules address both contract behavior and the efficiency of the code used to execute it.

Checks Cover Calculations and Cardano Addresses

The documented rule set covers data handling, address comparisons, transaction validity windows and precision loss in integer calculations.

One example concerns division before multiplication. Early division can discard precision through rounding, affecting a fee calculation or another amount computed by a contract. The documented alternative multiplies first and divides afterward.

Another check flags comparisons involving only the payment credential of a Cardano address. Such comparisons can overlook differences in staking credentials. Where a contract requires a complete match, the documentation recommends comparing the full address.

Performance checks also identify repeated passes over the same lists, which can increase script execution costs. These examples come from the documented rule set; the weekly report does not specify which individual checks were added in this release.

VS Code and Cursor Track Findings and Fixes

The Plu-Stan extension organizes findings by severity, rule or module. Developers can inspect explanations, compare problematic code with suggested alternatives and record why a warning was dismissed.

Coverage varies across the rules. Some checks detect a narrower range of patterns, while other issues have no automated coverage. A review without warnings cannot establish contract security or replace an audit.

The project’s release information also remains inconsistent. Although Input Output reports a stable release, the repository README still describes Plu-Stan as a proof of concept that is not ready for production use.

During an active editor review, saving an on-chain module automatically reruns the analysis and updates which findings are fixed, new or unresolved. Dismissed warnings and optional explanations persist across sessions and can be shared with the team, preserving review decisions as the contract evolves.