Anthropic's HTTP API for programmatic access to Claude AI models

Official Python/TypeScript library wrapping the Claude API

Pattern where an AI model iteratively calls tools and processes results until done

Claude API feature where the model requests external function calls during reasoning

JSON Schema definition of a tool's name, description, and input parameters

Instructions given to Claude before the conversation to define its role/behavior

Maximum token count Claude can process in a single API call

Receiving Claude's response token-by-token via SSE instead of waiting for completion

Sampling parameter (0-1) controlling randomness; lower = more deterministic

Conversation involving multiple user-assistant message pairs passed as history

Automated cycle: prompt to Claude decides to tool call to result to next prompt

Python library for data validation using type annotations; used for tool input schemas

Older term for Tool Use - Claude requesting a specific function be executed

API constraint on requests-per-minute or tokens-per-minute for a tier

Claude model tiers - Haiku (fast/cheap), Sonnet (balanced), Opus (most capable)