Development & Testing

Claude API Reference

by Anthropic 161k GitHub stars

Reference for the Claude API and Anthropic SDK — model ids, pricing, params, streaming, tool use, MCP, caching, and tokens.

#claude#api#sdk#reference

Claude Code Codex

Overview

The Claude API skill is an authoritative reference for building with the Claude API and Anthropic SDK, covering model ids, pricing, parameters, streaming, tool use, MCP, prompt caching, token counting, and migration. It keeps LLM integration details accurate rather than guessed from memory.

What it is good for

Choosing the right model and params
Implementing streaming and tool use
Setting up prompt caching
Estimating pricing and token usage

Install

Install in Claude Code

# Add the marketplace, then install the skill in Claude Code:
/plugin marketplace add anthropics/skills
/plugin install claude-api

# Or install manually into ~/.claude/skills:
git clone https://github.com/anthropics/skills.git
cp -r skills/claude-api ~/.claude/skills/claude-api

Install in Codex

# Codex reads SKILL.md skills from ~/.codex/skills (auto-detected):
git clone https://github.com/anthropics/skills.git
cp -r skills/claude-api ~/.codex/skills/claude-api

# Then reference the skill in Codex — it loads on demand.

Visit Source (GitHub)

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