# Anthropic Tool Use API

**Canonical:** https://apis.io/apis/agent-skills/anthropic-tool-use-api/  
**Provider:** Agent Skills — https://apis.io/providers/agent-skills/  
**Base URL:** https://api.anthropic.com  
**Documentation:** https://platform.claude.com/docs/en/docs/agents-and-tools/tool-use/overview

Anthropic Tool Use API is one of 3 APIs that [Agent Skills](https://apis.io/providers/agent-skills/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include Anthropic, Tool Use, Function Calling, Claude, and AI Agents. The published artifact set on APIs.io includes API documentation, an API reference, and a getting-started guide.

The Anthropic Tool Use API allows AI agents built on Claude to call client-defined functions or Anthropic-provided server tools such as web search, code execution, and web fetch. Tools are declared in the API request and Claude decides when to invoke them based on context. Server tools run on Anthropic infrastructure while client tools execute in the calling application.

## Machine-readable artifacts (4)

- **Documentation** — https://platform.claude.com/docs/en/docs/agents-and-tools/tool-use/overview
- **APIReference** — https://platform.claude.com/docs/en/docs/agents-and-tools/tool-use/tool-reference
- **GettingStarted** — https://platform.claude.com/docs/en/docs/agents-and-tools/tool-use/build-a-tool-using-agent
- **APIsJSON** — https://raw.githubusercontent.com/api-evangelist/agent-skills/refs/heads/main/apis.yml

## Other Agent Skills APIs (2)

- [Google Agent Development Kit (ADK)](https://apis.io/apis/agent-skills/google-agent-development-kit-adk/)
- [Model Context Protocol (MCP)](https://apis.io/apis/agent-skills/model-context-protocol-mcp/)

## Tags

Anthropic, Tool Use, Function Calling, Claude, AI Agents

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/agent-skills/anthropic-tool-use-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/agent-skills/.