---
name: clade-hello-world-3189aba861b7
description: 'Send your first message to Claude using the Anthropic SDK.

  Use when starting a new Claude integration, testing your setup,

  or learning the Messages API basics.

  Trigger with phrases like "anthropic hello world", "claude api example",

  "first claude call", "anthropic quick start".

  '
allowed-tools: Read, Write, Edit
version: 1.1.0
license: MIT
author: Jeremy Longshore <jeremy@intentsolutions.io>
tags:
- saas
- anthropic
- claude
- messages-api
compatibility: Designed for Claude Code
---
# Anthropic Hello World

## Overview

Send your first message to Claude and get a response using the Messages API.

## Prerequisites

- Completed `clade-install-auth` setup
- `ANTHROPIC_API_KEY` environment variable set

## Instructions

### Step 1: Basic Message

```typescript
import Anthropic from '@claude-ai/sdk';

const client = new Anthropic();

const message = await client.messages.create({
  model: 'claude-sonnet-4-20250514',
  max_tokens: 1024,
  messages: [
    { role: 'user', content: 'What is the capital of France?' }
  ],
});

console.log(message.content[0].text);
// "The capital of France is Paris."
```

### Step 2: Add a System Prompt

```typescript
const message = await client.messages.create({
  model: 'claude-sonnet-4-20250514',
  max_tokens: 1024,
  system: 'You are a helpful geography expert. Be concise.',
  messages: [
    { role: 'user', content: 'What is the capital of France?' }
  ],
});
```

### Step 3: Multi-Turn Conversation

```typescript
const message = await client.messages.create({
  model: 'claude-sonnet-4-20250514',
  max_tokens: 1024,
  messages: [
    { role: 'user', content: 'What is the capital of France?' },
    { role: 'assistant', content: 'The capital of France is Paris.' },
    { role: 'user', content: 'What is its population?' },
  ],
});
```

## Python Example

```python
import anthropic

client = anthropic.Anthropic()

message = client.messages.create(
    model="claude-sonnet-4-20250514",
    max_tokens=1024,
    messages=[
        {"role": "user", "content": "What is the capital of France?"}
    ],
)
print(message.content[0].text)
```

## Output

- `message.content[0].text` — Claude's text response
- `message.model` — model ID used
- `message.usage.input_tokens` / `message.usage.output_tokens` — token counts
- `message.stop_reason` — `end_turn`, `max_tokens`, or `tool_use`

## Error Handling

| Error | Cause | Solution |
|-------|-------|----------|
| `authentication_error` | Bad API key | Check `ANTHROPIC_API_KEY` |
| `invalid_request_error` | Missing required field | Both `messages` and `max_tokens` are required |
| `not_found_error` | Invalid model ID | Use a valid model like `claude-sonnet-4-20250514` |

## Available Models

| Model | Best For | Context | Cost (input/output per MTok) |
|-------|----------|---------|------------------------------|
| `claude-opus-4-20250514` | Complex reasoning | 200K | $15 / $75 |
| `claude-sonnet-4-20250514` | Balanced quality + speed | 200K | $3 / $15 |
| `claude-haiku-4-5-20251001` | Fast, cheap tasks | 200K | $0.80 / $4 |

## Examples

See Step 1 (basic message), Step 2 (system prompt), and Step 3 (multi-turn) above. Python example included in its own section.

## Resources

- [Messages API Reference](https://platform.claude.com/docs/en/api/messages)
- [Model Overview](https://platform.claude.com/docs/en/models/overview)

## Next Steps

Proceed to `clade-model-inference` for streaming and advanced patterns.


---
Source attribution: jeremylongshore
Original project: https://github.com/jeremylongshore/claude-code-plugins-plus-skills/blob/ab85a061f7bcc039dac13ee193de7a4cd4388571/plugins/saas-packs/claude-pack/skills/clade-hello-world/SKILL.md
License: MIT
License information: https://opensource.org/license/mit
Original upstream instructions; downloaded from Mega AI Hub.

## Upstream license notice

MIT License

Copyright (c) 2025 Jeremy Longshore

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.



# Mega AI Hub resource metadata

Creator / publisher: jeremylongshore
Original project: https://github.com/jeremylongshore/claude-code-plugins-plus-skills/blob/ab85a061f7bcc039dac13ee193de7a4cd4388571/plugins/saas-packs/claude-pack/skills/clade-hello-world/SKILL.md
Attribution basis: Source repository record

Fields of work: Content & Media, Development & Engineering, Product Management
Roles: ML / AI Engineer, Product Manager, Technical Writer
Specialties: API, Backend, Design, Frontend, Testing
Tools: Anthropic Sdk
Country applicability: Country not specified
Classification basis: Source catalog labels
Instruction SHA-256: 5c472c6d2b45d20ca293e59fa08c292f2df5ebceb77be0cc38e2a4151bce3d46