perplexity-multi-env-setup

What this skill does

# Perplexity Multi-Environment Setup

## Overview

Configure Perplexity Sonar API across dev/staging/prod. Key decisions per environment: which models are allowed (sonar vs sonar-pro), rate limits, and cost caps. All environments use the same base URL (`https://api.perplexity.ai`) but different API keys with different budget limits.

## Environment Strategy

| Environment | Model | Rate Limit | Key Source | Monthly Budget |
|-------------|-------|-----------|------------|----------------|
| Development | `sonar` only | 5 RPM self-imposed | `.env.local` | $10 |
| Staging | `sonar` only | 20 RPM | CI secrets | $50 |
| Production | `sonar` + `sonar-pro` | 50 RPM | Secret manager | $500+ |

## Prerequisites

- Separate Perplexity API keys per environment
- `openai` package installed
- Secret management (env files for dev, vault/KMS for prod)

## Instructions

### Step 1: Configuration Structure

```
config/
  perplexity/
    base.ts           # OpenAI client + base URL
    development.ts    # Dev: sonar only, low limits
    staging.ts        # Staging: sonar only, moderate limits
    production.ts     # Prod: full model access
    index.ts          # Environment resolver
```

### Step 2: Base Configuration

```typescript
// config/perplexity/base.ts
import OpenAI from "openai";

export const PERPLEXITY_BASE_URL = "https://api.perplexity.ai";

export function createPerplexityClient(apiKey: string): OpenAI {
  if (!apiKey) throw new Error("Perplexity API key is required");
  if (!apiKey.startsWith("pplx-")) throw new Error("Invalid Perplexity API key format");

  return new OpenAI({ apiKey, baseURL: PERPLEXITY_BASE_URL });
}
```

### Step 3: Environment Configs

```typescript
// config/perplexity/development.ts
export const devConfig = {
  apiKey: process.env.PERPLEXITY_API_KEY!,
  defaultModel: "sonar" as const,
  deepModel: "sonar" as const,       // No sonar-pro in dev (cost)
  maxTokens: 512,
  maxConcurrentRequests: 1,
  cacheTTLMs: 24 * 3600_000,         // Long cache in dev
};

// config/perplexity/staging.ts
export const stagingConfig = {
  apiKey: process.env.PERPLEXITY_API_KEY_STAGING!,
  defaultModel: "sonar" as const,
  deepModel: "sonar" as const,       // Keep sonar in staging
  maxTokens: 1024,
  maxConcurrentRequests: 2,
  cacheTTLMs: 4 * 3600_000,
};

// config/perplexity/production.ts
export const productionConfig = {
  apiKey: process.env.PERPLEXITY_API_KEY_PROD!,
  defaultModel: "sonar" as const,    // Fast queries use sonar
  deepModel: "sonar-pro" as const,   // Research queries use sonar-pro
  maxTokens: 4096,
  maxConcurrentRequests: 10,
  cacheTTLMs: 1 * 3600_000,          // Shorter cache in prod (freshness)
};
```

### Step 4: Environment Resolver

```typescript
// config/perplexity/index.ts
import { createPerplexityClient } from "./base";
import { devConfig } from "./development";
import { stagingConfig } from "./staging";
import { productionConfig } from "./production";

type SearchDepth = "quick" | "deep";

const configs = {
  development: devConfig,
  staging: stagingConfig,
  production: productionConfig,
};

export function getConfig() {
  const env = process.env.NODE_ENV || "development";
  const config = configs[env as keyof typeof configs];
  if (!config) throw new Error(`Unknown environment: ${env}`);
  if (!config.apiKey) throw new Error(`PERPLEXITY_API_KEY not set for ${env}`);
  return config;
}

export function getClient() {
  return createPerplexityClient(getConfig().apiKey);
}

export function getModelForDepth(depth: SearchDepth): string {
  const cfg = getConfig();
  return depth === "deep" ? cfg.deepModel : cfg.defaultModel;
}
```

### Step 5: Usage with Environment-Aware Search

```typescript
// lib/search.ts
import { getClient, getModelForDepth, getConfig } from "../config/perplexity";

export async function search(query: string, depth: "quick" | "deep" = "quick") {
  const client = getClient();
  const model = getModelForDepth(depth);
  const config = getConfig();

  const result = await client.chat.completions.create({
    model,
    messages: [
      { role: "system", content: "Provide accurate, well-sourced answers." },
      { role: "user", content: query },
    ],
    max_tokens: depth === "deep" ? config.maxTokens : Math.min(512, config.maxTokens),
  });

  return {
    answer: result.choices[0].message.content,
    citations: (result as any).citations || [],
    model,
    environment: process.env.NODE_ENV,
    usage: result.usage,
  };
}
```

### Step 6: Secret Manager Integration (Production)

```bash
set -euo pipefail
# Google Cloud Secret Manager
gcloud secrets create perplexity-api-key-prod \
  --data-file=<(echo -n "$PERPLEXITY_API_KEY_PROD")

# AWS Secrets Manager
aws secretsmanager create-secret \
  --name perplexity/api-key-prod \
  --secret-string "$PERPLEXITY_API_KEY_PROD"

# HashiCorp Vault
vault kv put secret/perplexity api_key="$PERPLEXITY_API_KEY_PROD"
```

## Error Handling

| Issue | Cause | Solution |
|-------|-------|----------|
| `401` in staging | Wrong API key for environment | Verify `PERPLEXITY_API_KEY_STAGING` |
| `429` in dev | Exceeding self-imposed limit | Add request queuing |
| sonar-pro in dev | Config not restricting models | Set `deepModel: "sonar"` in dev config |
| High dev costs | Using production config locally | Ensure `NODE_ENV=development` is set |

## Output

- Environment-specific Perplexity configurations
- Model routing by environment and query depth
- Secret manager integration for production keys
- Cost controls per environment

## Resources

- [Perplexity API Documentation](https://docs.perplexity.ai)
- [Perplexity Pricing](https://docs.perplexity.ai/docs/getting-started/pricing)

## Next Steps

For deployment configuration, see `perplexity-deploy-integration`.