Claude API ReferenceSkill

Added to Onei Jul 22, 2026

1 views

markdown

Summary

Authoritative reference for the Claude API and Anthropic SDKs — model IDs, pricing, parameters, streaming, tool use, MCP, agents, prompt caching, and token counting.

Install This Skill

Add this skill to your favorite AI agent in a few steps.

Any AI agent

This skill is plain instructions — it works with any assistant that accepts custom instructions or system prompts.

Copy the skill content with the button below.
Paste it into your agent's instruction file or system prompt (for example AGENTS.md, .cursorrules, or a custom instructions field).
Ask the agent to apply the skill whenever the task matches.

Claude Code & Claude apps

Claude loads skills automatically from its skills directory.

Claude Code

Create a skill folder — personal: ~/.claude/skills/claude-api/, or per-project: .claude/skills/claude-api/
Save the skill content as SKILL.md inside that folder.
Claude Code picks it up automatically and invokes it when relevant.

mkdir -p ~/.claude/skills/claude-api

Claude.ai / Claude Desktop

Enable Skills under Settings → Capabilities, then upload the skill (a folder or zip containing SKILL.md).

One-prompt install

Paste this prompt into any agent with web access and it will install the skill for you.

Install the "Claude API Reference" skill from Onei AI. Fetch https://onei.ai/skills/claude-api, extract the full skill content from the page, and save it where you load skills from (for Claude Code: .claude/skills/claude-api/SKILL.md). From now on, apply this skill whenever it is relevant to my request.

Skill Content

Markdown Content

Copy this content and use it with your preferred AI agent

# Claude API Reference

Use this skill whenever you are writing code against the Claude API or Anthropic SDK, or answering questions about models, pricing, limits, or caching.

## Covers
- Model IDs and pricing for the current Claude lineup
- Messages API parameters, streaming, and stop reasons
- Tool use, the Tool Runner loop, and MCP
- Managed agents, prompt caching, and token counting
- Migrating between model versions

## Why use it
LLM details change often; answering from memory produces stale model names and wrong prices. This skill grounds answers in current reference material.

Description

A reference skill for building on the Claude API and the Anthropic SDKs. It covers current model IDs and pricing, request parameters, streaming, tool use, the Model Context Protocol, agent patterns, prompt caching, token counting, and model-migration guidance — so integrations use accurate, up-to-date details instead of guesses from memory.

Related Skills

Skill: PlanetScale Safe Orchestrator

by PlanetScale

New

The master skill in PlanetScale's official pack: runs a full read-only best-practices assessment of a database or org, then produces one evidence-backed report.

Development

Skill: Inngest Agents

by Inngest

New

Build crash-safe AI agents on AgentKit and step.ai — durable tool calls, human-in-the-loop approval, realtime progress, and when not to reach for an agent loop at all.

Development

Skill: Inngest Durable Functions

by Inngest

New

Inngest's durable-execution playbook as an agent skill — steps and memoisation, event and cron triggers, idempotency, cancellation, retries and non-retriable errors.

Development

Skill: Temporal Developer

by Temporal

New

Temporal's official skill for building durable workflows — SDK patterns across seven languages, plus the determinism rules that decide whether a workflow survives a replay.

Development

Browse all skills →