circom

Reference circom language and compiler for circuits, constraints, signals, and templates.

4|1|Updated Jan 30, 2026
One-click install
npx skills add https://github.com/hairyf/blockchain-skills --skill circom
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: circom
Source: https://github.com/hairyf/blockchain-skills/tree/main/skills/circom
Command: npx skills add https://github.com/hairyf/blockchain-skills --skill circom

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill provides comprehensive guidance on the circom language and its compiler, enabling users to understand and effectively build circuits for zero-knowledge proofs.

Core Features & Use Cases

  • Language Semantics: Deep dives into signals, templates, components, and constraints.
  • Circuit Development: Practical advice on control flow, data types, and best practices for writing secure and efficient circuits.
  • Compilation & Optimization: Understanding compiler flags, optimization levels, and debugging tools.
  • Use Case: A developer new to zk-SNARKs can use this Skill to learn how to define a simple arithmetic circuit, compile it, and generate a witness.

Quick Start

Explain the concept of signal safety in circom, referencing the relevant documentation.

Frequently Asked Questions about circom

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

FAQPage Schema
How do I define arithmetic circuits and constraints for zero-knowledge proofs using circom?

To define arithmetic circuits in circom, you use signals, templates, and components to establish mathematical constraints, creating a structured circuit that a zk-SNARK compiler can process for proof generation.

What is signal safety in circom and how do I handle unknowns when writing circuits?

Signal safety in circom involves following best practices for assertion, logging, and simplification to prevent under-constrained circuits, ensuring that unknowns are handled correctly to maintain zero-knowledge proof security.

How does circom handle control flow, operators, and data types like buses and tags?

Circom handles control flow and data types through specialized operators, functions, and variables, allowing developers to use anonymous components, buses, and tags for complex circuit logic.

Can I use circom to compile a circuit and generate a witness for zk-SNARKs?

Yes, you can use circom to compile arithmetic circuits by understanding compiler flags and optimization levels, which allows you to generate a witness required for zk-SNARK applications.

What are the best practices for writing secure and efficient zero-knowledge circuits?

Best practices for secure zero-knowledge circuits include focusing on signal safety, proper assertion, logging, simplification, and carefully managing unknowns to avoid logical flaws and ensure efficient compilation.

When do I need to use templates and the main component in circom circuit development?

You need templates and the main component in circom when structuring circuit logic to define reusable constraints and signals, which is essential for building valid zero-knowledge proofs.