ClaudSkills / Engineering / architecture

Write Design Doc

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

Category: Engineering · Sub-category: architecture · Last updated: 2026-06-13

Assembles architecture, data modeling, and API design work into a structured, readable system design document. Focuses on writing quality, document structure, and completeness — the thinking work (decomposition, trade-offs, data modeling) happens in other skills and this skill pulls the results together into a single artifact that engineers and LLMs can implement from. Use when the user asks to write a design doc, document a design, write up the architecture, create a technical spec, assemble a system design, or says things like "write this up", "let's document the design", "create a design doc for this", or "turn this into a spec".

From the source SKILL.md

Assembles a system design into a structured document that engineers and LLMs can understand, implement from, and maintain. This skill is about the DOCUMENT — structure, sections, writing quality, completeness. The intellectual work of decomposing systems, analyzing trade-offs, modeling data, and designing APIs happens in other skills; this skill pulls their outputs together into a coherent, readable artifact.

What this skill does

Write Design Doc 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/write-design-doc/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when the user asks to write a design doc, document a design, write up the architecture, create a technical spec, assemble a system design, or says things like "write this up", "let's document the design", "create a design doc for this", or "turn this into a spec".

Who uses this skill

The Write Design Doc 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 116,000+ 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/write-design-doc
curl -L https://claudskills.com/skills/write-design-doc/SKILL.md \
  -o ~/.claude/skills/write-design-doc/SKILL.md

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

Skills live at ~/.claude/skills/write-design-doc/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\write-design-doc\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 Write Design Doc Claude Code skill?

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

What does the Write Design Doc skill do?

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 Write Design Doc skill?

Use Write Design Doc 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 Write Design Doc" or describe the task and let Claude pick). Browse related skills at /category/engineering/.

What is a Claude Code skill and how does the Write Design Doc 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. Write Design Doc 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

lucasilverentand. (2026). Write Design Doc [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/write-design-doc/

BibTeX

@misc{write-design-doc-2026,
  author    = {lucasilverentand},
  title     = {Write Design Doc [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/write-design-doc/}
}

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