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Iada

Category: Engineering  ·  Sub-category: architecture  ·  Last updated:
type:review
Rank the parts of a system by how many parties must change when each part changes (Identifiers, then API, then Data, then Architecture) and catch inversions where a cheap-to-change layer has leaked into an expensive one. Use when designing or reviewing identifiers, REST or package APIs, schemas, storage, or a data model; when someone says "/iada" or asks whether a change is safe or a name is stable; or when a design question turns on "what would this cost to change later".
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From the source SKILL.md

A doctrine I worked under for years, restated from memory and in my own words. Four layers, ordered by the cost of changing them. The cost is measured in parties, not lines: how many people or systems outside this repo would have to act if this changed.

What this skill does

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

When to invoke it: Use when designing or reviewing identifiers, REST or package APIs, schemas, storage, or a data model; when someone says "/iada" or asks whether a change is safe or a name is stable; or when a design question turns on "what would this cost to change later".

Who uses this skill

The Iada 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 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/iada
curl -L https://claudskills.com/skills/iada/SKILL.md \
  -o ~/.claude/skills/iada/SKILL.md

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

Skills live at ~/.claude/skills/iada/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\iada\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 Iada Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/iada/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Iada skill do?
Rank the parts of a system by how many parties must change when each part changes (Identifiers, then API, then Data, then Architecture) and catch inversions where a cheap-to-change layer has leaked into an expensive one. Use when designing or reviewing identifiers, REST or package APIs, schemas, storage, or a data model; when someone says "/iada" or asks whether a change is safe or a name is stable; or when a design question turns on "what would this cost to change later".
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 Iada skill?
Use Iada when your Claude Code task falls under the Engineering category — specifically in the architecture 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 Iada" or describe the task and let Claude pick). Browse related skills at /category/engineering/.
What is a Claude Code skill and how does the Iada 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. Iada 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
mark-brannan. (2026). Iada [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/iada/
BibTeX
@misc{iada-2026,
  author    = {mark-brannan},
  title     = {Iada [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/iada/}
}

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Grade A · scanned 2026-09-28 — free static scan against the OWASP Agentic Skills Top 10.

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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

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