Can I validate existing JSON or YAML files with this skill?

Yes, Nickel allows you to import external JSON, YAML, or TOML files and apply validation contracts to ensure they meet your defined schema requirements.

Does Nickel require static typing?

No, Nickel features gradual typing. You can use static types for complex logic where checking is needed, while using dynamic validation (contracts) for configuration data.

What is the primary use case for Nickel?

Nickel is primarily used to generate static configuration files like JSON, YAML, and TOML while providing advanced features like type safety, validation, and reusable templates.

What makes Nickel's merging system different?

Nickel uses symmetric recursive merging, where both the base and the override contribute to the final result, allowing for complex metadata and priority management.

How do I export my Nickel configuration to other formats?

You can use the 'nickel export' command followed by the desired format (e.g., --format yaml) to convert your Nickel source into static configuration files.

Nickel Configuration Language

Name: Nickel Configuration Language
Author: vinnie357

byvinnie357

•

Deployment & DevOps

Generates and validates type-safe static configuration files using gradual typing and runtime contracts.

Nickel is a specialized configuration language designed to simplify the generation and management of static configuration formats like JSON, YAML, and TOML. This skill empowers Claude to define robust, reusable configuration schemas, apply runtime contracts for data validation, and execute complex merging logic. By combining the flexibility of dynamic typing with the reliability of static checking, Nickel is ideal for developers and DevOps engineers who need to maintain complex infrastructure-as-code or application settings while ensuring strict data integrity and consistency across multiple environments.

Key Features

01Runtime contracts for complex schema validation and custom predicates

02Symmetric recursive merging of configuration records and metadata

03Multi-format export capabilities for JSON, YAML, TOML, and XML

04Built-in CLI integration for evaluation, formatting, and validation

0511 GitHub stars

06Gradual typing system for mixing logic-heavy code with flexible data

Use Cases

01Managing environment-specific overrides using symmetric merge semantics

02Defining type-safe schemas for infrastructure-as-code and application settings

03Validating external YAML or JSON files against Nickel contract definitions

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add vinnie357/claude-skills nickel

For use in Claude.ai and ChatGPT