Skill 007

Feature Specification Generator

Create structured feature specifications from natural language descriptions.

SpecKit Workflow

This skill is Step 1 of 6 in the Relentless workflow:

specify → plan → tasks → analyze → implement (task by task) or relentless run --feature [FEATURE NAME] --tui

What flows to next step:

• User requirements → plan will create technical approach
• Routing preference → carried through all artifacts
• Acceptance criteria → basis for TDD in implementation

TDD is MANDATORY

The specification MUST include testable acceptance criteria:

• Every user requirement should be verifiable with tests
• Test scenarios should be part of each story
• Edge cases should be documented for test coverage

All acceptance criteria must be written in Given/When/Then format to enable direct test implementation.

The Job

1. Receive feature description from user
2. Confirm routing preference (Step 0)
3. Generate short name and feature number
4. Create branch and feature directory in relentless/features/NNN-feature-name/
5. Generate specification using template
6. Validate specification quality (including TDD readiness)
7. Save to spec.md

Step 0: Confirm Routing Preference (BEFORE generating spec)

Ask the user these specific questions:

1. "Which routing mode?" (free/cheap/good/genius) - Default: good
2. "Allow free models in fallback?" - Default: yes
3. "Specific harness/model preference?" - Default: auto

Record the answer in spec.md metadata:

**Routing Preference**: auto: good | allow free: yes
<!-- Options: auto: free|cheap|good|genius | allow free: yes|no | OR specific: harness/model -->

Step 1: Create Feature Structure

Run the create-new-feature script to set up the branch and directory:

.claude/skills/specify/scripts/bash/create-new-feature.sh --json "FEATURE_DESCRIPTION"

This will output JSON with:

• BRANCH_NAME: e.g., "003-user-auth"
• SPEC_FILE: Full path to spec.md
• FEATURE_DIR: Full path to feature directory
• FEATURE_NUM: e.g., "003"

Important: Parse this JSON and use these paths for all subsequent operations.

Step 2: Load Constitution & Context

1. Read relentless/constitution.md for project governance
2. Note any MUST/SHOULD rules that apply to specifications
3. Keep these principles in mind while generating the spec
4. Pay special attention to TDD requirements - all features must be testable

Step 3: Generate Specification

Using the template at templates/spec.md, create a specification with:

Required Sections:

1. Feature Overview

• One-paragraph summary
• User value proposition
• Problem being solved

2. User Scenarios & Testing

• Concrete user stories with priorities (P1, P2, P3...)
• Step-by-step flows
• Expected outcomes
• Given/When/Then acceptance scenarios (MANDATORY)
• Independent testability explanation for each story

3. Functional Requirements

• What the system must do
• Testable requirements (no implementation details)
• Clear success criteria

4. Test Strategy (MANDATORY)

• Unit test approach
• Integration test scenarios
• Edge case tests
• Test data requirements

5. Success Criteria

• Measurable, technology-agnostic outcomes
• Quantitative metrics (time, performance, volume)
• Qualitative measures (user satisfaction, task completion)

6. Key Entities (if applicable)

• Data models and relationships
• Fields and types (logical, not implementation)

7. Dependencies & Assumptions

• External systems required
• Prerequisites
• Assumptions made

8. Out of Scope

• What this feature explicitly does NOT include
• Future considerations

Step 4: Handle Ambiguities

If aspects are unclear:

• Interview the user first with questions to clarify any doubts, concerns or about his opinion on eventual ideas to improve the feature.
• Only mark [NEEDS CLARIFICATION: specific question] if:
  • Choice significantly impacts scope or UX
  • Multiple reasonable interpretations exist
  • No reasonable default exists
  • Question not already solved by interview
• LIMIT: Maximum 3 clarifications

If clarifications needed, present to user:

## Clarification Needed

**Q1: [Topic]**
Context: [Quote spec section]
Question: [Specific question]

Options:
A. [Option 1] - [Implications]
B. [Option 2] - [Implications]
C. Custom - [Your answer]

Your choice: _

Step 5: Validate Quality

Check the specification against:

General Quality

• No implementation details (languages, frameworks, APIs)
• Focused on user value and business needs
• All requirements are testable
• Success criteria are measurable
• User scenarios cover primary flows
• Dependencies identified
• Scope clearly bounded
• No more than 3 [NEEDS CLARIFICATION] markers

TDD Readiness (MANDATORY)

• Every user story has Given/When/Then acceptance criteria
• Acceptance criteria are specific enough to write tests against
• Edge cases are documented for test coverage
• Test strategy section is complete

Routing Compliance

• Routing preference is recorded in metadata
• Routing choice is reasonable for feature complexity

If validation fails, revise and re-check (max 3 iterations).

Step 6: Save & Report

1. Write complete specification to SPEC_FILE from JSON output

2. Create progress.txt if it doesn't exist:

   ---
   feature: FEATURE_NAME
   started: DATE
   last_updated: DATE
   stories_completed: 0
   routing_preference: [auto: mode | allow free: yes/no]
   ---
   
   # Progress Log: FEATURE_NAME
   

3. Report to user:

   • Branch created: BRANCH_NAME
   • Spec saved: SPEC_FILE
   • Quality validation: PASSED/FAILED
   • TDD readiness: PASSED/FAILED
   • Routing preference: [recorded value]
   • Next step: /relentless.plan or /relentless.clarify

Example Output

# Feature: User Authentication

**Routing Preference**: auto: good | allow free: yes

## Overview
Enable users to create accounts and log in securely using email/password.

## User Scenarios

### User Story 1: New User Registration (Priority: P1)

User visits signup page, enters email and password, and creates an account.

**Why this priority**: Core functionality, blocks all other auth features.

**Independent Test**: Can be fully tested by registering a new account and verifying the account exists.

**Acceptance Scenarios**:

1. **Given** a visitor on the signup page, **When** they submit valid email and password, **Then** the account is created and confirmation email sent
2. **Given** an email already in use, **When** visitor tries to register, **Then** error message shown without revealing account exists

## Functional Requirements

**REQ-1:** System must validate email format
**REQ-2:** System must require passwords ≥ 8 characters
**REQ-3:** System must send confirmation email within 1 minute
**REQ-4:** System must hash passwords before storage

## Test Strategy (MANDATORY)

### Unit Test Approach
- Email validation logic
- Password strength validation
- Password hashing utility

### Integration Test Scenarios
- Full registration flow (submit form → create account → send email)
- Duplicate email rejection

### Edge Case Tests
- Invalid email formats (missing @, invalid domain)
- Password too short
- Unicode in email/password

### Test Data Requirements
- Valid test email addresses
- Various invalid email formats
- Password examples at boundary conditions

## Success Criteria

1. 95% of signups complete within 60 seconds
2. Zero plaintext passwords in database
3. Email confirmation rate > 80%

## Key Entities

**User**
- email: string (unique)
- password_hash: string
- confirmed: boolean
- created_at: timestamp

## Dependencies

- Email service provider (e.g., SendGrid, Mailgun)
- Session management system

## Out of Scope

- Social login (OAuth)
- Two-factor authentication
- Password reset (separate feature)

Notes

• Always run the script first to get proper paths
• Use absolute paths from JSON output
• Validate before marking complete
• Keep specification technology-agnostic
• Focus on WHAT, not HOW
• TDD readiness is non-negotiable - all acceptance criteria must be testable