Interface Over Conditionals

Q: What is a Claude Code skill and how does the Interface Over Conditionals 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. Interface Over Conditionals is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the General category. Learn more at https://claudskills.com/learn/what-is-skill-md/.

Category: General · Sub-category: general-misc · Last updated: 2026-06-18

Model behavioral variation as an interface with N implementations and select the right one for the context — instead of branching on a type/flag at every call site.

Security AStatic scan found no risk patternsHow grading works ›

From the source SKILL.md

When behavior varies by some type/mode/flag, the reflex is if/elif/else (or switch) at each call site. That scatters the variation across the codebase, and every new variant means editing every branch. Instead: define one interface, write one implementation per variant, and inject/select the right implementation for the context. Having the right implementation IS the answer — the conditional disappears.

What this skill does

Interface Over Conditionals is a community-contributed Claude Code skill in the general-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/interface-over-conditionals/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The Interface Over Conditionals Claude Code skill is built for Claude Code users and developers across all disciplines looking for general-purpose AI assistance. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 196,000+ 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/interface-over-conditionals
curl -L https://claudskills.com/skills/interface-over-conditionals/SKILL.md \
  -o ~/.claude/skills/interface-over-conditionals/SKILL.md

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

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

📱 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 Interface Over Conditionals Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/interface-over-conditionals/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.

What does the Interface Over Conditionals skill do?

Model behavioral variation as an interface with N implementations and select the right one for the context — instead of branching on a type/flag at every call site.

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 Interface Over Conditionals skill?

Use Interface Over Conditionals when your Claude Code task falls under the General category — specifically in the general misc 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 Interface Over Conditionals" or describe the task and let Claude pick). Browse related skills at /category/general/.

What is a Claude Code skill and how does the Interface Over Conditionals 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. Interface Over Conditionals is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the General category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Source: https://github.com/selamy-labs/agent-skills/blob/HEAD/skills/interface-over-conditionals/SKILL.md
License: MIT
Author: selamy-labs

Cite this skill

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

APA

selamy-labs. (2026). Interface Over Conditionals [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/interface-over-conditionals/

BibTeX

@misc{interface-over-conditionals-2026,
  author    = {selamy-labs},
  title     = {Interface Over Conditionals [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/interface-over-conditionals/}
}

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Badge

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Security scan

Grade A · scanned 2026-09-28 — 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 ›

✓ Prompt injection
✓ Data exfiltration
✓ Supply chain
✓ Reverse shell
✓ Credentials
✓ Execution
✓ Filesystem
✓ Persistence
✓ Obfuscation
✓ Network

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

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

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Part of ClaudSkills — the open registry for Claude Skills & Claude Code Skills. · What's New · Install guide · About · llms.txt

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