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Feature Spec Writer (feature-spec)

Turns a one-line feature idea into a full product spec with acceptance criteria, scope, dependencies, and risks.

Docs & OfficeBeginner★ 3,569⑂ 543AI score 8/10Last updated: Sep 29, 2026

What it does

  • Generates a complete specification at docs/specs/{feature-name}.md from a short feature description.
  • Writes the problem statement, success metrics, and user stories with GIVEN/WHEN/THEN acceptance criteria.
  • Captures in-scope vs. out-of-scope items, dependencies, risks, and open questions.
  • Researches existing specs first to avoid conflicts, then produces handoff notes for the Dev agent.
  • Follows a checklist flow: SIGN IN → draft → TIME OUT (completion check) → SIGN OUT (memory update).

Who it's for

  • PMs and product owners who want a consistent PRD template instead of a blank page.
  • Team leads who need requirements pinned down before implementation starts.
  • Solo developers who want a clear, self-authored scope document.
  • Agile teams drafting user stories for the backlog quickly.

Examples

  1. /feature-spec user authentication with JWT tokens → spec covering login, refresh, and expiry with testable acceptance criteria.
  2. /feature-spec multi-tenant billing system with Stripe integration → document outlining payment flows, tenant isolation, and failure risks.
  3. /feature-spec webhook event system → creates docs/specs/webhook-event-system.md with success metrics and Dev handoff notes.

· · · Install guide · · ·

Try it now, no install

Paste this into Claude to use the skill without installing anything.

Read the instructions in this file and follow them to help me:
https://raw.githubusercontent.com/davepoon/buildwithclaude/HEAD/plugins/agent-triforce/skills/feature-spec/SKILL.md

What I want: (describe your task here)

If Claude can't open the link, open it yourself and paste the contents instead.

↓ If it works for you, download the ZIP below and install it. Then it runs on its own — no pasting each time.

Install in the Claude app (no terminal)
  1. Download the ZIP with the button below.
  2. In Claude, open Settings → Capabilities and turn on 'Code execution and file creation'. (one time)
  3. Go to Customize → Skills → + → 'Upload a skill' and upload the ZIP.
↓ Download ZIP
Install in Claude Code

Let Claude do it — paste this into Claude Code

Install the skill I found on Claude Skill Mart.
Copy the plugins/agent-triforce/skills/feature-spec folder from the GitHub repo davepoon/buildwithclaude into my ~/.claude/skills/feature-spec/.
When it's done, tell me in one line what this skill can do.

Install with a command instead

git clone https://github.com/davepoon/buildwithclaude.git && mkdir -p ~/.claude/skills && cp -r buildwithclaude/plugins/agent-triforce/skills/feature-spec ~/.claude/skills/

⚠ This is a third-party skill. Check the source repository before installing.

  1. Open your terminal.
  2. Clone the repository: git clone https://github.com/davepoon/buildwithclaude.git
  3. Create the skills folder if needed: mkdir -p ~/.claude/skills
  4. Copy the skill: cp -r buildwithclaude/plugins/agent-triforce/skills/feature-spec ~/.claude/skills/
  5. (Recommended) The skill delegates to the Prometeo (PM) agent from the agent-triforce plugin, so install the whole plugins/agent-triforce directory for full behavior.
  6. Restart Claude Code, then run /feature-spec <your feature description>.
  7. Review the generated file under docs/specs/ and edit it before handing it to implementation.
View source on GitHub ↗License: MIT