OpenSpec Change Planning from *.plan.md

Guide the process of turning an implementation plan (*.plan.md) into an OpenSpec change workflow. This is an interactive SKILL. It verifies CLI availability, initializes OpenSpec when needed, and then creates or updates a change with proposal, design, tasks, and spec deltas.

What is covered in this Skill?

• Input analysis from *.plan.md (scope, change-id candidate, affected capabilities)
• Installation and availability checks for OpenSpec CLI
• Recommended installation paths on macOS, Linux, and Windows using npm
• OpenSpec project bootstrapping with openspec init
• Existing-project workflow using openspec list, openspec status, openspec show
• Validation and completion flow with openspec validate --all and openspec archive
• Example-root workflow at examples/requirements-examples/problem1/requirements/openspec

Constraints

Always execute OpenSpec commands from the parent directory that contains the openspec/ folder. Do not invent requirements not present in the *.plan.md; convert plan intent into explicit OpenSpec change artifacts.

• MUST: Start by reading and summarizing the provided *.plan.md
• MUST: Check CLI availability with openspec --version before any OpenSpec operation
• MUST: If OpenSpec is missing, provide macOS, Linux, and Windows install guidance via npm command
• MUST: Offer openspec init when no OpenSpec project exists
• MUST: When creating a new OpenSpec project, run plain openspec init only (do not use --tools ... options)
• MUST: Use a stable change-id (for example: add-dark-mode) for status/show/archive commands
• MUST: Run openspec validate --all before archiving
• MUST: When a feature/change is completed (all checklist tasks done), guide the user to archive it (for example: openspec archive us-001-god-analysis-api)
• MUST: In tasks.md, generate a single OpenSpec checklist (- [ ] / - [x]) only; do not add a second table-based task list
• MUST: Explain whether the workflow creates a new change or updates an existing one
• EDGE CASE: If request scope is ambiguous, stop and ask a clarifying question before applying changes
• EDGE CASE: If required inputs, files, or tooling are missing, report what is missing and ask whether to proceed with setup guidance

When to use this skill

• Convert *.plan.md into OpenSpec
• Add change proposal from plan
• Update existing OpenSpec project
• Initialize OpenSpec in requirements folder
• Validate and archive OpenSpec change

Workflow

1. Read and summarize plan input

Read references/042-planning-openspec.md and the provided *.plan.md, then summarize scope and identify candidate change-id and affected capabilities.

2. Check OpenSpec CLI and install gate

Run openspec --version; if missing, provide npm installation guidance for macOS, Linux, and Windows before proceeding.

3. Initialize or detect OpenSpec project

From the parent directory containing openspec/, run project checks and offer openspec init (without --tools) when initialization is needed.

4. Create or update change artifacts

Explain whether this is a new or existing change, then create/update proposal, design, tasks, and spec deltas using a stable change-id.

5. Validate and close workflow

Run openspec validate --all; when checklist tasks are complete, guide the user to archive the change with openspec archive <change-id>.

Reference

For detailed guidance, examples, and constraints, see references/042-planning-openspec.md.