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nginx-c-module-design

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nginx C module directive design guidelines for creating admin-friendly configuration interfaces. This skill should be used when designing nginx module directives — deciding what to expose vs hardcode, naming conventions, scope placement, default values, variable design, and validation patterns. Triggers on tasks involving ngx_command_t design, directive naming, configuration API design, nginx module public interface, or directive deprecation.

skills/.experimental/nginx-c-module-design/SKILL.md

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# nginx.org C Module Directive Design Best Practices

Comprehensive directive design guide for nginx C module authors, focused on creating clear, consistent, and admin-friendly configuration interfaces. Contains 46 rules across 8 categories, prioritized by impact to guide decisions about what to expose, how to name it, and how to evolve it safely.

## When to Apply

Reference these guidelines when:
- Deciding which values to expose as directives vs hardcode
- Naming new directives and choosing argument types
- Selecting scope placement (http, server, location)
- Setting default values and validation behavior
- Designing nginx variables for runtime data
- Deprecating or renaming existing directives
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