Imported from jeremylongshore/tons-of-skills-marketplace (skills/.curated/spec-writing/SKILL.md). Install upstream with npx skills add jeremylongshore/tons-of-skills-marketplace --skill spec-writing. Copyright stays with the author (MIT).

Spec Writing

Overview

Spec Writing provides guidance on authoring effective specs.md files that drive the Sprint plugin's autonomous development workflow. A well-written specification determines the quality of agent output by clearly defining goals, scope boundaries, and testing requirements.

Prerequisites

• Sprint plugin installed (/plugin install sprint)
• Project onboarding completed via /sprint:setup (creates project-goals.md and project-map.md)
• Sprint directory created via /sprint:new (generates .claude/sprint/[N]/specs.md)
• Understanding of the sprint phase lifecycle (see the sprint-workflow skill)

Instructions

1. Open the generated specs.md file at .claude/sprint/[N]/specs.md and define a concise goal statement at the top. State what the sprint delivers in one sentence (e.g., "Add user authentication with email/password login").
2. Define explicit scope boundaries using In Scope and Out of Scope sections. List specific features, endpoints, or components in each. Agents only implement what appears in scope; ambiguity leads to drift.
3. Add the Testing section to control which testing agents run and how. Configure three settings as documented in ${CLAUDE_SKILL_DIR}/references/testing-configuration.md:
   • QA: required | optional | skip -- Controls API and unit test execution
   • UI Testing: required | optional | skip -- Controls browser-based E2E tests
   • UI Testing Mode: automated | manual -- Auto-run or user-driven testing
4. Set QA to required for new API endpoints, business logic changes, and data validation rules. Set QA to skip for frontend-only changes, documentation updates, or configuration changes.
5. Set UI Testing to required for user-facing features, form submissions, and navigation flows. Choose automated mode for regression testing and standard CRUD flows; choose manual mode for complex interactions, visual verification, or exploratory testing.
6. Keep specifications minimal but precise. The architect expands high-level specs into detailed implementation files (backend-specs.md, frontend-specs.md, api-contract.md). Over-specifying implementation details in specs.md constrains the architect unnecessarily.
7. For iterative sprints, review status.md from the previous iteration. Remove completed items from specs and add any new requirements or bug fixes discovered during testing.

Output

• A complete specs.md file with goal, scope (in/out), and testing configuration
• Clear scope boundaries that prevent agent drift during implementation
• Testing configuration that selects appropriate QA and UI testing agents
• Iteratively refined specs where completed work is removed and remaining work is focused

Error Handling

Examples

Minimal but effective spec:

# Sprint 1: User Authentication

## Goal
Add user authentication with email/password login

## Scope
### In Scope
- Registration endpoint (POST /auth/register)
- Login endpoint (POST /auth/login)
- JWT token generation and validation
- Password hashing with bcrypt

### Out of Scope
- OAuth providers (Google, GitHub)
- Password reset flow
- Email verification

## Testing
- QA: required
- UI Testing: required
- UI Testing Mode: automated

Frontend-only sprint (no QA needed):

# Sprint 3: Dashboard Redesign

## Goal
Redesign the admin dashboard with responsive layout

## Scope
### In Scope
- Responsive grid layout for dashboard widgets
- Dark mode toggle
- Mobile navigation drawer

### Out of Scope
- New API endpoints
- Database changes
- Authentication changes

## Testing
- QA: skip
- UI Testing: required
- UI Testing Mode: manual

Resources

• ${CLAUDE_SKILL_DIR}/references/testing-configuration.md -- Testing section options with guidance on when to use each setting
• Sprint workflow skill for understanding how specs feed into the phase lifecycle
• API contract skill for designing endpoint contracts referenced by specs