tech-spec-writer

Draft technical specifications with architecture, API contracts, and data models.

1|Updated Feb 5, 2026

Search Tags:#template #architecture #documentation #specification #api-design #technical-writing #data-model

Ready to run

npx skills add https://github.com/tygwan/ultra-codex-init --skill tech-spec-writer-tygwan

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: tech-spec-writer
Source: https://github.com/tygwan/ultra-codex-init/tree/main/.codex/skills/tech-spec-writer
Command: npx skills add https://github.com/tygwan/ultra-codex-init --skill tech-spec-writer-tygwan

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill helps teams convert vague requirements into precise technical specifications, including architecture diagrams, API contracts, and data models, enabling faster alignment and reducing rework.

Core Features & Use Cases

Architecture drafting and documentation
API design and contract specifications
Data model definition with entity relationships
Template-guided workflows and PRD alignment

Quick Start

Open a new spec using the TECH-SPEC-TEMPLATE.md and begin by outlining the architecture, then document the data models and API endpoints in separate sections.

Frequently Asked Questions about tech-spec-writer

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I write a technical specification for software architecture and API design?▼

Draft a technical specification by applying a template-driven approach to document software architecture, API contracts, and data models. This process converts vague requirements into precise technical specs with ASCII diagrams and explicit entity relationships.

What is the best way to document data models and API contracts for a new feature?▼

The best way to document data models and API contracts is using a structured template. Outline the architecture first, then define explicit data models with entity relationships and document API endpoints in separate sections.

How do I align teams on software architecture and data flows before implementation?▼

Align teams on software architecture by drafting comprehensive technical specifications that include ASCII diagrams, explicit data models, and API contracts. Precise project-level and feature-level documents reduce rework and enable faster team alignment.

Can I use a template-driven approach for both project-level and feature-level technical specs?▼

Yes, a template-driven approach supports both project-level and feature-level technical specifications. It applies across architectures, services, and data flows to ensure consistent documentation of API design and data models.

When do I need a technical specification document with ASCII diagrams and explicit data models?▼

You need a technical specification document when converting vague requirements into precise architecture, API, and data model definitions. This is required to align teams and reduce development rework before implementation begins.

How do I structure a technical specification to align with a PRD?▼

Structure a technical specification to align with a PRD by opening a new spec using a template, then documenting the architecture, data models, and API endpoints in dedicated sections to ensure full technical coverage.