Claude Code Skills·Claude Skills·The open SKILL.md registry for Claude
ClaudSkills / Engineering / backend

Extension Development

Category: Engineering  ·  Sub-category: backend  ·  Last updated:
Build a PostgreSQL backend loadable extension (.so / contrib module) — covers the .control file, the foo--1.0.sql install script + foo--1.0--1.1.sql upgrade scripts, PGXS vs meson build wiring, the `_PG_init` entry point, shared_preload_libraries vs LOAD vs CREATE EXTENSION load timing, chained hook installation (ProcessUtility_hook, planner_hook, ExecutorStart_hook), trusted vs untrusted extensions, and SQL-callable C function declarations (PG_FUNCTION_INFO_V1, PG_RETURN_*). Use whenever a PG extension is being written or modified — wiring _PG_init, registering hooks, picking PGXS vs meson, writing install/upgrade SQL, declaring CREATE FUNCTION ... LANGUAGE C, or marking the extension trusted. Skip for VS Code / Chrome / Firefox / Safari / browser extensions, NPM / pip / RubyGems / Cargo packages, IntelliJ / Eclipse plugins, and shell completion scripts.
Security AStatic scan found no risk patternsHow grading works ›

From the source SKILL.md

Skill for shipping a loadable extension — what files to create, what each file declares, the two supported build paths, and the hook/GUC idioms that 90% of real extensions use.

What this skill does

Extension Development is a community-contributed Claude Code skill in the backend sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/extension-development/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use whenever a PG extension is being written or modified — wiring _PG_init, registering hooks, picking PGXS vs meson, writing install/upgrade SQL, declaring CREATE FUNCTION .

Who uses this skill

The Extension Development Claude Code skill is built for software engineers, backend developers, full-stack teams, and technical leads building and maintaining production systems. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 158,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/extension-development
curl -L https://claudskills.com/skills/extension-development/SKILL.md \
  -o ~/.claude/skills/extension-development/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/extension-development/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/extension-development/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\extension-development\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Telegram

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Extension Development Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/extension-development/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Extension Development skill do?
Build a PostgreSQL backend loadable extension (.so / contrib module) — covers the .control file, the foo--1.0.sql install script + foo--1.0--1.1.sql upgrade scripts, PGXS vs meson build wiring, the `_PG_init` entry point, shared_preload_libraries vs LOAD vs CREATE EXTENSION load timing, chained hook installation (ProcessUtility_hook, planner_hook, ExecutorStart_hook), trusted vs untrusted extensions, and SQL-callable C function declarations (PG_FUNCTION_INFO_V1, PG_RETURN_*). Use whenever a PG extension is being written or modified — wiring _PG_init, registering hooks, picking PGXS vs meson, writing install/upgrade SQL, declaring CREATE FUNCTION ... LANGUAGE C, or marking the extension trusted. Skip for VS Code / Chrome / Firefox / Safari / browser extensions, NPM / pip / RubyGems / Cargo packages, IntelliJ / Eclipse plugins, and shell completion scripts.
Is this skill free to install?
Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.
When should I use the Extension Development skill?
Use Extension Development when your Claude Code task falls under the Engineering category — specifically in the backend area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Extension Development" or describe the task and let Claude pick). Browse related skills at /category/engineering/.
What is a Claude Code skill and how does the Extension Development skill fit in?
A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Extension Development is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Engineering category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA
matejformanek. (2026). Extension Development [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/extension-development/
BibTeX
@misc{extension-development-2026,
  author    = {matejformanek},
  title     = {Extension Development [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/extension-development/}
}

Embed this skill

Promote, attribute, or link this skill from your own README, blog post, or documentation. All three snippets are free to use — no sign-up, no API key. More distribution surfaces →

Badge
[![ClaudSkills](https://claudskills.com/badge/extension-development.svg)](https://claudskills.com/skills/extension-development/?utm_source=badge&utm_medium=readme&utm_campaign=skill_badge)
<script>
<script src="https://claudskills.com/embed/extension-development.js" async></script>
<iframe>
<iframe src="https://claudskills.com/embed/extension-development.html" width="100%" height="160" frameborder="0" loading="lazy" title="ClaudSkills: Extension Development"></iframe>

Security scan

Grade A · scanned 2026-07-23 — free static scan against the OWASP Agentic Skills Top 10.

No risk patterns were found in any of the ten OWASP-aligned categories. How grading works ›

Show this grade on your repo (click to copy):

[![Security: A](https://img.shields.io/badge/Security-A-2e7d32)](https://claudskills.com/skills/extension-development/#security)

Free. No spam. Unsubscribe in one click.

More Engineering skills

Browse all Engineering skills in the ClaudSkills registry, or explore these other picks from the same category:

Browse all Engineering skills → Top 100 skills
Part of ClaudSkills — the open registry for Claude Skills & Claude Code Skills.  ·  What's New  ·  Install guide  ·  About  ·  llms.txt

Part of Acreator Store — Adam Lankamer's AI tools: PerfectStudio · Ucaption · UTagger · AutoXPoster · TestYourSkills · AutomationFlows · Au Naturel · Telegram @acreatorstore

Categories

Use cases

Popular tags

Learn

Site