SDK vs CLI System Prompts

import Anthropic from "@anthropic-ai/sdk";

const client = new Anthropic();

// Option 1: Use claude_code preset
const response = await client.messages.create({
  model: "claude-sonnet-4-20250514",
  max_tokens: 1024,
  // Match CLI system prompt as closely as possible
  system: "Your exact system prompt matching CLI",
  messages: [
    { role: "user", content: "What is the capital of Norway?" }
  ],
  // Use greedy decoding for maximum consistency
  temperature: 0
});

// Option 2: With Agent SDK query function
import { query } from "@anthropic-ai/agent-sdk";

for await (const message of query({
  prompt: "What is the capital of Norway?",
  options: {
    systemPrompt: {
      type: "preset",
      preset: "claude_code"
    },
    temperature: 0,
    model: "claude-sonnet-4-20250514",
    // Load project context like CLI does
    settingSources: ["project"]
  }
})) {
  // Process response
}