clade-local-dev-loop
Set up a fast local development loop for building with the Anthropic API — Use when working with local-dev-loop patterns. hot reload, cost-saving tips, and test patterns. Trigger with "anthropic dev setup", "claude local development", "anthropic test locally", "claude dev workflow".
What this skill does
# Anthropic Local Dev Loop
## Overview
Set up a fast, cheap development workflow for building with Claude.
## Prerequisites
- Node.js 18+ or Python 3.10+
- `ANTHROPIC_API_KEY` environment variable set
- npm or pip package manager
## Instructions
### Step 1: Project Setup
```bash
mkdir my-claude-app && cd my-claude-app
npm init -y
npm install @claude-ai/sdk dotenv tsx
# Create .env (never commit this)
echo 'ANTHROPIC_API_KEY=sk-ant-api03-...' > .env
echo '.env' >> .gitignore
```
### Step 2: Create a Test Script
```typescript
// src/test-prompt.ts
import 'dotenv/config';
import Anthropic from '@claude-ai/sdk';
const client = new Anthropic();
async function main() {
const message = await client.messages.create({
model: 'claude-haiku-4-5-20251001', // Use Haiku for dev — 20x cheaper than Opus
max_tokens: 512,
messages: [{ role: 'user', content: 'Summarize this in one sentence: ...' }],
});
console.log(message.content[0].text);
console.log(`Cost: ~$${((message.usage.input_tokens * 0.80 + message.usage.output_tokens * 4) / 1_000_000).toFixed(4)}`);
}
main();
```
### Step 3: Run with Hot Reload
```bash
# Watch mode — re-runs on file changes
npx tsx watch src/test-prompt.ts
# Or one-shot
npx tsx src/test-prompt.ts
```
## Cost-Saving Dev Tips
| Tip | Savings |
|-----|---------|
| Use `claude-haiku-4-5-20251001` during development | 20x cheaper than Opus |
| Set `max_tokens: 256` for testing | Fewer output tokens billed |
| Cache your system prompt with prompt caching beta | 90% off cached input tokens |
| Use Message Batches for bulk testing (50% off) | Half price, 24h turnaround |
| Log responses locally so you don't re-call for the same input | 100% savings on repeats |
## Mock Client for Unit Tests
```typescript
// tests/mock-anthropic.ts
export function createMockClient() {
return {
messages: {
create: async (params: any) => ({
id: 'msg_test',
type: 'message',
role: 'assistant',
model: params.model,
content: [{ type: 'text', text: 'Mock response for testing' }],
stop_reason: 'end_turn',
usage: { input_tokens: 10, output_tokens: 5 },
}),
},
};
}
// In your test:
import { createMockClient } from './mock-anthropic';
const client = process.env.MOCK ? createMockClient() : new Anthropic();
```
## Python Dev Loop
```text
pip install anthropic python-dotenv ipython
# Interactive exploration
ANTHROPIC_API_KEY=sk-ant-... ipython
>>> import anthropic
>>> c = anthropic.Anthropic()
>>> r = c.messages.create(model="claude-haiku-4-5-20251001", max_tokens=100, messages=[{"role":"user","content":"hello"}])
>>> r.content[0].text
```
## Output
- Project scaffolded with SDK, dotenv, and tsx for hot reload
- Test script running against Claude Haiku (cheapest model)
- Mock client available for unit tests without API calls
- Cost estimate printed per request
## Error Handling
| Issue | Fix |
|-------|-----|
| `ANTHROPIC_API_KEY` not loading | Make sure `dotenv/config` is imported first |
| Slow iteration | Use Haiku, reduce max_tokens |
| High dev costs | Log responses, use mocks for unit tests |
## Examples
See Step 1 (project setup), Step 2 (test script with cost tracking), Step 3 (hot reload), Mock Client section, and Python Dev Loop section above.
## Resources
- [Quickstart Guide](https://docs.anthropic.com/en/docs/initial-setup)
- TypeScript SDK
## Next Steps
See `clade-sdk-patterns` for production client configuration.
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