Phase 1 Spec

Q: What is a Claude Code skill and how does the Phase 1 Spec 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. Phase 1 Spec 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: 2026-06-13

Write a functional specification for a new Tercen window/header widget. Use when starting a new widget, converting an existing one, or when the user asks for a spec, requirements, or functional design. Produces a complete spec document with no code.

From the source SKILL.md

READ-ONLY. Do NOT modify. Log gaps to _issues/session-log.md and continue.

What this skill does

Phase 1 Spec 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/phase-1-spec/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when starting a new widget, converting an existing one, or when the user asks for a spec, requirements, or functional design. Produces a complete spec document with no code.

Who uses this skill

The Phase 1 Spec 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 119,000+ 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/phase-1-spec
curl -L https://claudskills.com/skills/phase-1-spec/SKILL.md \
  -o ~/.claude/skills/phase-1-spec/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/phase-1-spec/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/phase-1-spec/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\phase-1-spec\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 Phase 1 Spec Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/phase-1-spec/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.

What does the Phase 1 Spec 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 Phase 1 Spec skill?

Use Phase 1 Spec 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 Phase 1 Spec" or describe the task and let Claude pick). Browse related skills at /category/general/.

What is a Claude Code skill and how does the Phase 1 Spec 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. Phase 1 Spec 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/tercen/tercen_ui_widgets/blob/a3fc9253ef8f31e41762bc0f2f3c71256c23e1f5/.claude/skills/phase-1-spec/SKILL.md
Author: tercen

Cite this skill

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

APA

tercen. (2026). Phase 1 Spec [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/phase-1-spec/

BibTeX

@misc{phase-1-spec-2026,
  author    = {tercen},
  title     = {Phase 1 Spec [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/phase-1-spec/}
}

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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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