design-an-interface is agent-read markdown (skill) from chinkan/rustfox: Generate multiple radically different interface designs for a module using parallel sub-agents. Use when user wants to design an API, explore interface options, compare module shapes, or mentions "design it twice"..
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What the file says
# Design an Interface
Based on "Design It Twice" from "A Philosophy of Software Design": your first idea is unlikely to be the best. Generate multiple radically different designs, then compare.
## Workflow
### 1. Gather Requirements
Before designing, understand:
- [ ] What problem does this module solve?
- [ ] Who are the callers? (other modules, external users, tests)
- [ ] What are the key operations?
- [ ] Any constraints? (performance, compatibility, existing patterns)
- [ ] What should be hidden inside vs exposed?
Ask: "What does this module need to do? Who will use it?"
### 2. Generate Designs (Parallel Sub-Agents)
Spawn 3+ sub-agents simultaneously using Task tool. Each must produce a **radically different** approach.
```
Prompt template for each sub-agent:
Design an interface for: [module description]
Requirements: [gathered requirements]
Constraints for this design: [assign a different constraint to each agent]
- Agent 1: "Minimize method count - aim for 1-3 methods max"
- Agent 2: "Maximize flexibility - support many use cases"
- Agent 3: "Optimize for the most common case"
- Agent 4: "Take inspiration from [specific paradigm/library]"
Output format:
…
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Source
GitHub
chinkan/rustfox · 9 stars · license MIT · pushed 2026-09-24 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_j6sl5ubvrh7757gb
GET https://markdownregistry.com/api/v1/resolve?ref=chinkan/rustfox/design-an-interface
GET https://markdownregistry.com/api/v1/blob/a2596e9fa2d50e23ba014f64a5b8f9df4eb56b846a52cad152899ef5eb97b085
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