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10 pages in this section.
Learn how the Claude Messages API uses alternating user and assistant roles within a messages array and a separate system prompt to structure conversations.
Learn to send single-turn and multi-turn requests, add system prompts, and manage conversation history using the Anthropic Messages API.
Learn to build multi-turn conversations with the Anthropic Messages API. Maintain conversation history by managing and resending the full messages array.
Explore Messages API roles and content block types. Learn about user, assistant, and system roles, plus text, image, tool_use, and tool_result blocks.
Learn to write effective system prompts for Claude to define persona, constraints, and output format for consistent, predictable AI behavior.
Learn best practices for structuring roles, turns, and content blocks in the Messages API to build reliable conversational AI applications.
A single-page roundup of every highlight bullet from the 9 pages in the Messages API section, grouped by source page so you can scan all 52 takeaways without opening each article individually.