claude-api

Files (2)

• SKILL.md
• openai.yaml · agents/

SKILL.md (first lines)

---
name: claude-api
description: Anthropic Claude API patterns for Python and TypeScript. Covers Messages API, streaming, tool use, vision, extended thinking, batches, prompt caching, and Claude Agent SDK. Use when building applications with the Claude API or Anthropic SDKs.
origin: ECC
---

# Claude API

Build applications with the Anthropic Claude API and SDKs.

## When to Activate

- Building applications that call the Claude API
- Code imports `anthropic` (Python) or `@anthropic-ai/sdk` (TypeScript)
- User asks about Claude API patterns, tool use, streaming, or vision
- Implementing agent workflows with Claude Agent SDK
- Optimizing API costs, token usage, or latency

## Model Selection

| Model | ID | Best For |
|-------|-----|----------|
| Opus 4.6 | `claude-opus-4-6` | Complex reasoning, architecture, research |
| Sonnet 4.6 | `claude-sonnet-4-6` | Balanced coding, most development tasks |
| Haiku 4.5 | `claude-haiku-4-5-20251001` | Fast responses, high-volume, cost-sensitive |

Default to Sonnet 4.6 unless the task requires deep reasoning (Opus) or speed/cost optimization (Haiku).

## Python SDK

### Installation

```bash
pip install anthropic
```

### Basic Message

```python
import anthropic

client = anthropic.Anthropic()  # reads ANTHROPIC_API_KEY from env

message = client.messages.create(
    model="claude-sonnet-4-6",
    max_tokens=1024,
    messages=[
        {"role": "user", "content": "Explain async/await in Python"}
    ]
)
print(message.content[0].text)
```

### Streaming

```python
with client.messages.stream(
    model="claude-sonnet-4-6",
    max_tokens=1024,
    messages=[{"role": "user", "content": "Write a haiku about coding"}]
) as stream:
    for text in stream.text_stream:
        print(text, end="", flush=True)
```

### System Prompt

```python
message = client.messages.create(
    model="claude-sonnet-4-6",
    max_tokens=1024,
    system="You are a senior Python developer. Be concise.",
    messages=[{"role": "user", "content": "Review this function"}]
)
```

## TypeScript SDK

### Installation

```bash
npm install @anthropic-ai/sdk
```

### Basic Message

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

const client = new Anthropic(); // reads ANTHROPIC_API_KEY from env

const message = await client.messages.create({
  model: "claude-sonnet-4-6",
  max_tokens: 1024,
  messages: [
    { role: "user", content: "Explain async/await in TypeScript" }
  ],
});
console.log(message.content[0].text);
```

### Streaming

```typescript
const stream = client.messages.stream({
  model: "claude-sonnet-4-6",
  max_tokens: 1024,
  messages: [{ role: "user", content: "Write a haiku" }],
});

for await (const event of stream) {
  if (event.type === "content_block_delta" && event.delta.type === "text_delta") {
    process.stdout.write(event.delta.text);
  }
}
```

## Tool Use

Define tools and let Claude call them:

From niloykumarbarman/EVERYTHING-CLAUDE-CODE, MIT.

More from niloykumarbarman/EVERYTHING-CLAUDE-CODE