Developer sandbox

Interactive Playgrounds and Demo Environments

When to Use

Use this skill when you need design and build interactive playgrounds that let developers experience your product without commitment. This skill covers playground architecture, pre-populated examples, embedding strategies, gating decisions, and converting playground users to signups. Trigger phrases: "developer...

Let developers experience your product before they commit. A great playground removes the biggest barrier to adoption: uncertainty about whether your product solves their problem.

Overview

Developer playgrounds serve multiple purposes:

• Evaluation: Let developers test before investing setup time
• Learning: Interactive environment for understanding concepts
• Marketing: Demonstrate capabilities without sales calls
• Support: Reproducible environment for debugging issues

This skill covers designing playgrounds that convert curious visitors into active users.

Before You Start

Review the developer-audience-context skill to understand:

• What do developers want to validate before signing up?
• What's the typical evaluation workflow in your space?
• What competing products offer playgrounds?
• What's the minimum viable experience that demonstrates value?

Your playground should answer the questions developers have when evaluating.

Playground Design Principles

Principle 1: Instant Gratification

Developers should see something meaningful within 10 seconds of landing.

Good: Page loads with a working example already running Bad: Empty editor with "Type your code here" placeholder

<!-- Good: Pre-loaded, running example -->
<div class="playground">
  <div class="editor">
    <pre><code>// Analyze sentiment of this text
const result = await api.analyze("I love this product!");
console.log(result.sentiment); // "positive"</code></pre>
  </div>
  <div class="output">
    <pre>{ "sentiment": "positive", "confidence": 0.94 }</pre>
  </div>
  <button class="run-btn">Run ▶️</button>
</div>

Principle 2: Progressive Complexity

Start simple, let developers go deeper as curiosity grows.

Level 1: One-Click Demo

[Analyze Text] → See result immediately

Level 2: Editable Input

[Edit the text] → [Run] → See result

Level 3: Full API Access

Edit code → Modify parameters → See raw request/response

Level 4: Full Playground

Multiple files → Import SDK → Build mini-app

Principle 3: Real API, Real Results

Never fake the results. Use your actual API with sandbox credentials.

Why real matters:

• Builds trust (not a demo, but actual product)
• Shows real performance characteristics
• Demonstrates actual error handling
• No surprises when they sign up

Principle 4: Zero Friction

No signup required for basic playground. No installation. No configuration.

❌ Bad: "Sign up to try the playground"
❌ Bad: "Install our CLI to continue"
❌ Bad: "Configure your environment..."

✅ Good: Works immediately in browser

Pre-Populated Examples

Example Selection Strategy

Choose examples that:

1. Show core value in 30 seconds
2. Solve real problems developers have
3. Demonstrate differentiation from competitors
4. Scale in complexity from simple to advanced

Example Categories

"Hello World" Example

• Simplest possible use of your API
• Should work with zero modification
• Proves the system is working

// Example: Text Analysis API
const result = await api.analyze("Hello, world!");
// Output: { words: 2, characters: 13 }

"Aha Moment" Example

• Shows unique capability of your product
• Creates the "wow, that was easy" reaction
• This is your most important example

// Example: Shows AI doing something impressive
const result = await api.summarize(longArticle);
// Output: A perfect 3-sentence summary

"Real Use Case" Examples

• Actual scenarios developers encounter
• Shows how to solve specific problems
• Multiple examples for different use cases

// Example 1: E-commerce - Analyze product reviews
// Example 2: Support - Classify incoming tickets
// Example 3: Social - Detect spam comments

"Integration" Examples

• Shows product working with popular tools
• Addresses "will this work with my stack?" concern

// Example: Integration with Express.js
app.post('/analyze', async (req, res) => {
  const result = await api.analyze(req.body.text);
  res.json(result);
});

Example Quality Checklist

• Example runs without modification
• Output is interesting/impressive
• Code follows language best practices
• Comments explain what's happening
• Real-world use case is obvious
• Leads to natural "what else can it do?" curiosity

Sharing and Embedding

Shareable Playground URLs

Enable developers to share their playground state:

https://playground.example.com/?code=BASE64_ENCODED_CODE
https://playground