How should sensitive data like API keys be handled?

The skill provides a pattern for 'Sensitive Data' that ensures secrets are loaded exclusively from environment variables and skipped during file-based serialization to prevent accidental leakage.

How does the skill handle cross-platform directory standards?

It implements the XDG Base Directory specification using the 'directories' crate to ensure your application correctly uses ~/.config on Linux, Application Support on macOS, and AppData on Windows.

What is the recommended configuration file format for Rust CLIs?

This skill recommends TOML due to its balance of human readability, support for comments, and excellent error messaging, though it also provides patterns for YAML and JSON.

What is the order of configuration precedence?

The skill follows a high-to-low priority hierarchy: CLI arguments, then environment variables, followed by project-specific config, user config, system config, and finally hard-coded defaults.

Rust CLI Configuration

Name: Rust CLI Configuration
Author: geoffjay

bygeoffjay

•

Developer Tools

Implements robust configuration management systems for Rust command-line applications following industry standards and best practices.

This skill provides specialized patterns and implementation guidance for managing configuration in Rust CLI tools. It helps developers establish a standardized configuration precedence order—integrating hard-coded defaults, system and user-level config files, project-specific settings, environment variables, and CLI arguments. By leveraging industry-standard crates like config, directories, and clap, it ensures your application follows the XDG Base Directory specification for cross-platform compatibility while supporting multiple formats like TOML, YAML, and JSON. It also includes advanced patterns for configuration validation, automated default generation, and versioned migrations.

Key Features

01Multi-format support for TOML, YAML, and JSON configuration files

02Early-load configuration validation and versioned migration strategies

03XDG Base Directory specification support for cross-platform path management

04Integration patterns for environment variables and sensitive secret handling

052 GitHub stars

06Standardized configuration precedence logic (CLI > Env > File > Defaults)

Use Cases

01Building production-grade Rust CLI tools with persistent user settings

02Implementing environment-variable-based configuration for CI/CD and containerized environments

03Managing complex application states across Linux, macOS, and Windows using platform-native paths

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add geoffjay/claude-plugins cli-configuration

For use in Claude.ai and ChatGPT

Download Skill