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Claude API

Claude API is an agent skill (a SKILL.md file) from anthropics/skills. Reference for the Claude API / Anthropic SDK — model ids, pricing, params, streaming, tool use, MCP, agents, caching, token counting, model migration. It works with Claude Code and has 183,836 GitHub stars across a repository of 9 listed skills.

github.com/anthropics/skills/skills/claude-api (opens in a new tab)

Data as of from the GitHub API and skills.sh; description from the skill's SKILL.md. Report an error

View on GitHub (opens in a new tab)View on skills.sh (opens in a new tab)

Add this skill

Claude

This repository is a Claude Code plugin marketplace. In Claude Code:

/plugin marketplace add anthropics/skills
/plugin   # browse anthropic-agent-skills and install the plugin that contains claude-api

In the Claude apps, zip the claude-api folder and upload it under Customize > Skills > + > Upload a skill (code execution must be on).

ChatGPT / Codex

Codex reads skills from .agents/skills/ in a repo or ~/.agents/skills/ for every project:

git clone --depth 1 https://github.com/anthropics/skills.git
cp -r skills/skills/claude-api .agents/skills/claude-api   # repo; ~/.agents/skills for all projects

Standalone skills also load in the ChatGPT desktop app.

Cursor

Cursor loads skills from .cursor/skills/ (or ~/.cursor/skills/) and also reads .claude/skills/:

git clone --depth 1 https://github.com/anthropics/skills.git
cp -r skills/skills/claude-api .cursor/skills/claude-api   # project; ~/.cursor/skills for all projects

Source (checked Oct 7, 2026): code.claude.com/docs/en/skills (opens in a new tab), code.claude.com/docs/en/plugin-marketplaces (opens in a new tab), support.claude.com/en/articles/12512180-using-skills-in-claude (opens in a new tab), learn.chatgpt.com/docs/build-skills (opens in a new tab), cursor.com/docs/context/skills (opens in a new tab)

What this skill does

Reference for the Claude API / Anthropic SDK — model ids, pricing, params, streaming, tool use, MCP, agents, caching, token counting, model migration. TRIGGER — read BEFORE opening the target file; don't skip because it "looks like a one-liner" — whenever: the prompt names Claude/Anthropic in any form (Claude, Anthropic, Fable, Opus, Sonnet, Haiku, anthropic, @anthropic-ai, claude-, us.anthropic., [1m]); the user asks about an LLM (pricing/model choice/limits/caching) — never answer from…

When it triggers

  • "looks like a one-liner"

More skills in anthropics/skills

9 skills are listed from this repository.

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FAQ

Claude API FAQ

Still curious? Email info@appsgit.com.

How do I install the Claude API skill?

In Claude Code, run /plugin marketplace add anthropics/skills, then install its plugin from /plugin. For Codex or Cursor, copy the claude-api folder into .agents/skills/ or .cursor/skills/.

Is the Claude API skill free?

Yes. The repository is open source under the Apache-2.0 license. The skill mentions an API key or token for an external service, which may need its own account.

Is Claude API maintained?

The repository's most recent commit was on Oct 9, 2026. appsgit only lists skills from repositories with a commit in the last six months.