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OpenSpec Change Proposer

Creates an OpenSpec change and generates proposal, design and tasks artifacts in a single step.

Dev & CodingIntermediate★ 424⑂ 90AI score 7/10Last updated: Aug 11, 2026

What it does

  • Turns a plain-language feature request into a kebab-case change name and scaffolds it with openspec new change.
  • Reads openspec status --json for artifact dependency order and applyRequires, then uses openspec instructions templates/rules to write proposal.md (what & why), design.md (how) and tasks.md (implementation steps).
  • Tracks progress with TodoWrite, verifies each file exists after writing, and finishes with a status summary plus a prompt to run /opsx:apply.
  • Includes guardrails: never copy context/rules blocks into artifacts, always re-read dependency files from disk, ask before reusing an existing change name.

Who it's for

  • Teams already practicing spec-driven development with OpenSpec.
  • Developers who want standardized proposal/design/task docs before coding.
  • Users managing multiple registered OpenSpec stores (handles the --store flag).

Examples

  1. "Add user authentication" → creates add-user-auth and all three artifacts.
  2. If the change already exists, it asks whether to continue or start a new one.
  3. When a store is named, it resolves ids via openspec store list --json and keeps --store <id> on follow-up commands.

· · · 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/jabrena/plinth/HEAD/benchmarks/problem1/scenario3/.agents/skills/openspec-propose/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 benchmarks/problem1/scenario3/.agents/skills/openspec-propose folder from the GitHub repo jabrena/plinth into my ~/.claude/skills/openspec-propose/.
When it's done, tell me in one line what this skill can do.

Install with a command instead

git clone https://github.com/jabrena/plinth.git && mkdir -p ~/.claude/skills && cp -r plinth/benchmarks/problem1/scenario3/.agents/skills/openspec-propose ~/.claude/skills/

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

  1. Install the openspec CLI first and initialize it so an openspec/ root or registered store exists.
  2. Clone the repo: git clone https://github.com/jabrena/plinth.git
  3. Create the skills folder: mkdir -p ~/.claude/skills
  4. Copy the skill: cp -r plinth/benchmarks/problem1/scenario3/.agents/skills/openspec-propose ~/.claude/skills/
  5. Restart Claude Code, then describe the change you want to build to trigger the skill.
View source on GitHub ↗License: Apache-2.0