Agent skill
clade-hello-world
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".
Install this agent skill to your Project
npx add-skill https://github.com/jeremylongshore/claude-code-plugins-plus-skills/tree/main/plugins/saas-packs/claude-pack/skills/clade-hello-world
SKILL.md
Anthropic Hello World
Overview
Send your first message to Claude and get a response using the Messages API.
Prerequisites
- Completed
clade-install-authsetup ANTHROPIC_API_KEYenvironment variable set
Instructions
Step 1: Basic Message
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
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
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
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 responsemessage.model— model ID usedmessage.usage.input_tokens/message.usage.output_tokens— token countsmessage.stop_reason—end_turn,max_tokens, ortool_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
Next Steps
Proceed to clade-model-inference for streaming and advanced patterns.
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