Feature Generator Skill

Expand a spec.md into a detailed features.md, ordered by the sequence an AI agent would most successfully implement them (dependency order). Keep both files in sync when either is modified.

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Step 1: Check for spec.md

Before doing anything, check whether spec.md exists in the current context or has been provided by the user.

If spec.md does not exist: Tell the user: "There's no spec.md yet — you'll need to create one first. If you have the spec-generator skill enabled, I can kick that off for you now. Would you like to do that?"

Do not proceed until spec.md is available.

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Step 2: Generating features.md

Read spec.md fully. Extract every discrete piece of functionality implied by the spec — from user roles, core features, and technical stack. Then produce features.md following the format below.

Ordering rules

Order features by implementation dependency — what must exist before something else can be built. Think like an AI agent working top to bottom through the file:

1. Foundation first — database, auth, core models
2. Then the simplest user-facing flows that depend on nothing else
3. Then features that build on those
4. Admin/internal features after customer-facing equivalents
5. Cross-cutting concerns (notifications, rate limiting, etc.) last

features.md format

Each feature follows this exact structure:

# [Product Name] — Features

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## [N]. [Feature Name]

[One sentence describing what this feature does and who it's for.]

**User flow**
1. [Step]
2. [Step]
3. [Step]

**UI overview**
[2–4 sentences describing the key UI elements involved.]

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Rules:

• Every feature gets a number, a user flow, and a UI overview — no exceptions
• User flows are written from the perspective of the actor (customer, team member, visitor)
• UI overview describes what the user sees and interacts with, not implementation detail
• No sub-bullets inside user flows — numbered steps only
• Horizontal rules (---) between every feature and after the title

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Step 3: Syncing changes

When the user modifies either spec.md or features.md and asks to sync:

If spec.md was modified:

• Identify what changed (new features added, features removed, features altered)
• Update only the relevant features in features.md to reflect those changes
• Add new features in the correct dependency order position
• Remove features that no longer exist in the spec
• Do not touch features that are unaffected

If features.md was modified:

• Identify what changed (features added, removed, or substantially altered)
• Update only the relevant sections of spec.md to reflect those changes
• Preserve all other spec content exactly as-is
• Do not rewrite or reformat untouched sections

Always confirm with the user what changed before syncing, so they can verify the right things are being updated.

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Output

Save features.md to /mnt/user-data/outputs/features.md and present it using present_files.

If syncing changes to spec.md, save the updated version to /mnt/user-data/outputs/spec.md and present both files.