anthropic

name	anthropic
title	Anthropic API
category	AI APIs
description	Use to build with Claude through the Messages API, including streaming, system prompts, token controls, and schema-validated tool use.
tags	["anthropic","claude","messages-api","streaming","tool-use"]
official_docs	https://platform.claude.com/docs
sources	["https://platform.claude.com/docs/en/api/getting-started","https://platform.claude.com/docs/en/api/messages","https://platform.claude.com/docs/en/build-with-claude/streaming","https://platform.claude.com/docs/en/agents-and-tools/tool-use/overview"]
last_verified	2026-08-10T00:00:00.000Z

Anthropic API - Skillship

Build Claude-powered applications with the stateless Messages API, typed content blocks, streaming, token accounting, and tools that run either in your application or on Anthropic's infrastructure.

🧭 When to use this skill

• Use when: adding Claude for generation, analysis, coding, document work, or agentic tool use.
• Use when: you need long-form streaming and explicit client/server tool execution boundaries.
• Don't use for: deterministic transformations or rules that ordinary code can perform reliably.

⚡ Quickstart

1. Install

npm install @anthropic-ai/sdk

2. Configure (server only)

ANTHROPIC_API_KEY=sk-ant-...
ANTHROPIC_MODEL=claude-sonnet-5

The SDK reads ANTHROPIC_API_KEY and sends required API headers automatically.

3. Create a message

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

const anthropic = new Anthropic();

const message = await anthropic.messages.create({
  model: process.env.ANTHROPIC_MODEL ?? "claude-sonnet-5",
  max_tokens: 1024,
  system: "Answer accurately and say when you do not know.",
  messages: [{ role: "user", content: "Explain vector databases in two sentences." }],
});

const text = message.content.find((block) => block. === );
 (text?. === ) .(text.);