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Tool Use in Claude: Official Course — AI Academy

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IntermediateИнженерияclaude

Tool Use in Claude: Official Course

Anthropic's official tool use course: from your first tool to a complex multi-tool chatbot. Real code from Anthropic's production examples.

3modules

6lessons

150 mintotal time

Developers building Claude agents with toolsaudience

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Module 1

Tool Use Fundamentals

What tool use is, why it matters, and how the complete 4-step cycle works between your code and Claude.

Tool Use Overview

What function calling is, why you'd extend Claude with tools, and how the 4-step tool use cycle works end to end.

Your First Simple Tool

Build a calculator tool, define it with JSON Schema, pass it to Claude, and handle the ToolUseBlock response to get accurate arithmetic results.

Module 2

Structured Outputs and Tool Choice

Using tool use to force structured JSON output and controlling tool selection with the tool_choice parameter.

Structured Outputs via Tool Use

The fake-tool trick for guaranteed JSON: sentiment analysis, entity extraction, and article classification using tool input_schema as a response schema.

Controlling Tool Selection: tool_choice

Three tool_choice modes: auto (Claude decides), any (must call one), tool (always call a specific one). SMS chatbot and sentiment analyzer as practical examples.

Module 3

Complete Workflow and Agentic Patterns

The full 4-step cycle with tool_result, a multi-tool support chatbot, and production patterns.

Complete Workflow: tool_result and Data Return

The correct tool_result message format, updating the messages list, and building a Wikipedia Q&A chatbot with a system prompt to prevent unnecessary tool calls.

Chatbot with Multiple Tools

TechNova support chatbot with 4 tools (get_user, get_order_by_id, get_customer_orders, cancel_order), a processing loop, system prompt, and extracting responses from reply tags.

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Updated · May 14, 2026