Technical Specification Writing
Write detailed technical specifications with requirements, architecture decisions, interface definitions, and implementation plans.
The team started coding before the spec was written — again. Now two engineers built conflicting implementations, the API contract doesn't match what the frontend expected, and the database schema can't handle the edge cases nobody discussed. A good technical spec prevents weeks of rework by forcing clarity before code.
Who it's for: senior engineers writing design documents for complex features, technical leads defining architecture for new systems, staff engineers creating specs that align multiple teams, engineering managers establishing spec-writing culture, platform engineers documenting API contracts and interface definitions
Example
"Write a technical spec for our new notification system" → Complete spec: problem statement and goals, architecture decision with alternatives considered, API interface definitions with request/response schemas, database schema design, sequence diagrams for key flows, edge case analysis, rollout plan, and success metrics
CLAUDE.md Template
New here? 3-minute setup guide → | Already set up? Copy the template below.
# Technical Specification Writing
## Your Role
You are an expert software architect. Your job is to write clear technical specifications that reduce ambiguity, document decisions, and guide implementation with enough detail to avoid rework.
## Core Principles
- Problem statement makes the solution feel inevitable
- Show alternatives considered with honest pros/cons
- Be explicit about trade-offs and costs
- Include rollback plan for every significant change
- Core spec fits 2-3 pages; details go in appendices
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What This Does
Creates detailed technical specifications that define the problem, propose solutions, document architecture decisions, specify interfaces, and outline implementation plans — reducing ambiguity before engineering begins.
Quick Start
Step 1: Download the Template
Click Download above to get the CLAUDE.md file.
Step 2: Define the Problem
Describe the feature, system change, or technical challenge that needs a specification.
Step 3: Start Using It
claude
Say: "Write a technical spec for migrating our authentication from session-based to JWT. Include alternatives considered, security implications, and rollback plan."
Spec Structure
| Section | Content |
|---|---|
| Problem Statement | What problem this solves and why it matters |
| Proposed Solution | Recommended approach with architecture |
| Alternatives Considered | Other options and why they were rejected |
| Technical Design | Data models, APIs, sequences, components |
| Security & Privacy | Implications and mitigations |
| Rollout Plan | Phases, feature flags, rollback procedures |
| Open Questions | Unresolved decisions for team discussion |
Tips
- Start with "why": The problem statement should make the solution feel inevitable
- Show your work: Alternatives considered with pros/cons builds trust in the recommendation
- Be specific about trade-offs: Every architectural choice has costs — document them
- Include rollback plan: How to undo this change if something goes wrong
Commands
"Write a technical spec for [feature/change]"
"Document the architecture for [system component]"
"Compare approaches for [technical decision]"
"Create a rollout plan with feature flags and rollback"
Troubleshooting
Spec too long Say: "Keep the core spec to 2-3 pages. Move detailed designs to appendices."
Too many open questions Ask: "Categorize: blocking (must resolve before starting) vs. deferrable (can decide during implementation)."
Spec not being reviewed Specify: "Add a TL;DR at the top with the key decision and 3 most important trade-offs."