lld-writer

Translate PRD, HLD, and Contract inputs into detailed Low-Level Design documents.

79|23|Updated Jan 6, 2026
One-click install
npx skills add https://github.com/TestAny-io/testany-agent-skills --skill lld-writer
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: lld-writer
Source: https://github.com/TestAny-io/testany-agent-skills/tree/main/plugins/testany-eng/skills/lld-writer
Command: npx skills add https://github.com/TestAny-io/testany-agent-skills --skill lld-writer

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

The LLD-writer turns high-level design decisions from PRD/HLD/Contract into precise, implementable Low-Level Design documents that guide developers and ensure consistency across modules.

Core Features & Use Cases

  • Interface & module design: Generates core module structures, interface signatures, and error handling ready for implementation.
  • Guardrails & traceability: Incorporates project guardrails and creates a traceability map from upstream documents to LLD.
  • Use Case: Given a PRD and HLD, produces an LLD that details core components, add-ons, and testing strategy.

Quick Start

  • Provide PRD/HLD/Contract inputs and request a complete LLD draft.
  • Example: lld-writer generate --prd docs/prd-login.md --hld docs/hld-login.md --contract docs/contract-login.json --output lld-login.md

Frequently Asked Questions about lld-writer

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

FAQPage Schema
How do I translate a PRD and HLD into implementable low-level design documentation?

Low-level design documentation translates high-level designs like PRD and HLD into precise interface signatures, error handling, and validation rules ready for implementation. It generates core module structures and testing strategies to ensure consistency across software modules.

What is the difference between HLD and LLD in software design documentation?

HLD defines overall system architecture and goals, while LLD details precise interface signatures, module structures, error handling, and testing considerations. LLD satisfies upstream baselines by creating a traceability map from PRD and HLD documents to implementable components.

Can I generate a low-level design draft directly from a PRD and a contract file?

Yes, you can generate a complete LLD draft by providing PRD, HLD, and contract inputs. The process outputs detailed documentation covering core components, add-ons, and testing strategy while incorporating project guardrails and traceability.

What should be included in interface design and module documentation for software engineering?

Interface design and module documentation should include core module structures, interface signatures, error handling, and validation rules. It must also incorporate project guardrails and a traceability map from upstream PRD and HLD baselines to ensure design consistency.

Does low-level design documentation need to include testing strategy and validation rules?

Yes, low-level design documentation includes testing considerations and validation rules as core components. It details testing strategies across core modules, add-ons, and guardrails to ensure the implementation satisfies upstream design goals and traceability requirements.