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nginx-c-module-design

nginx-c-module-design is a skill for Claude Code, Codex from pproenca/dot-skills. It costs 82 tokens per session (1,931 once invoked), scanned A, original, MIT.

A design guide for developers who create nginx modules in C, focused on the configuration options that administrators use to control those modules.

In plain words
What is it for?
Use it when deciding which settings to expose, naming directives, choosing where they apply, setting defaults, validating values, and deprecating or renaming options.
Why use it?
It helps make configuration options clear, consistent, validated, and safer to change over time instead of exposing confusing or fragile settings.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

not rated 205repo +4 24d ago A scan SkillSpector: pass 82 tokens original MIT

Good fit Use it when deciding which settings to expose, naming directives, choosing where they apply, setting defaults, validating values, and deprecating or renaming options.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/pproenca/dot-skills/nginx-c-module-design
View source ↗ pproenca/dot-skills
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add pproenca/dot-skills --skill nginx-c-module-design
Clone the repo
git clone --depth 1 https://github.com/pproenca/dot-skills

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for nginx-c-module-design

README.md
[![agentmods](https://agentmods.dev/badge/skills/pproenca/dot-skills/nginx-c-module-design/github.svg)](https://agentmods.dev/skills/pproenca/dot-skills/nginx-c-module-design)
Your own site
<a href="https://agentmods.dev/skills/pproenca/dot-skills/nginx-c-module-design"><img src="https://agentmods.dev/badge/skills/pproenca/dot-skills/nginx-c-module-design/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for nginx-c-module-design

Your own site · 80×15
<a href="https://agentmods.dev/skills/pproenca/dot-skills/nginx-c-module-design"><img src="https://agentmods.dev/badge/skills/pproenca/dot-skills/nginx-c-module-design.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 82 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,931 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00082 $0.01931
Opus 5 $0.00041 $0.00966
Sonnet 5 $0.00016 $0.00386
Haiku 4.5 $0.00008 $0.00193

Measured 5d ago against content hash 84f28b30e3b7, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

nginx-c-module-design scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/.experimental/nginx-c-module-design/SKILL.md · 126 lines

How it starts

The opening of the file, as written. The whole thing — 126 lines — stays where its author put it; the contents beside it link to each section on GitHub.

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

Companion Skills

This skill focuses on design decisions (the "what" and "why"). For implementation mechanics, see:

  • nginx-c-modules — C implementation: memory pools, request lifecycle, config parsing, handlers, filters
  • nginx-c-perf — Performance: buffers, connections, locks, caching, timeouts
  • nginx-c-debug — Debugging: crash diagnosis, GDB, tracing, sanitizers

Rule Categories by Priority

Priority Category Impact Prefix
1 Exposure Decisions CRITICAL expose-
2 Naming Conventions CRITICAL naming-
3 Directive Types HIGH type-
4 Scope Design HIGH scope-
5 Default Values MEDIUM-HIGH default-
6 Validation & Error Messages MEDIUM valid-
7 Variable Design MEDIUM var-
8 Evolution & Compatibility LOW-MEDIUM compat-

Quick Reference

1. Exposure Decisions (CRITICAL)

Read the full file on GitHub · 126 lines

Files

What ships with it

49 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 5d ago First seen · 126 lines · 82 tokens per session scan A 84f28b30e3b7

Subscribe to this mod's changes

nginx-c-module-design is a skill published in the GitHub repository pproenca/dot-skills (205 stars, last pushed 24d ago), licensed MIT. It adds 82 tokens to every session and 1,931 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

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