Building a capable AI agent in 2026 requires a stack of tools. Here's every category you need to know, including the physical-world layer that most guides miss.
Foundation Models
Claude (Anthropic), GPT-4o (OpenAI), Gemini (Google), Llama (Meta), the brains of your agent. Choose based on your use case: Claude for reasoning, GPT-4o for versatility, Gemini for multimodal, Llama for open-source.
Agent Frameworks
LangChain, CrewAI, AutoGPT, OpenAI Agents SDK, Vercel AI SDK, the scaffolding that turns a model into an agent with tools, memory, and planning capabilities.
Digital Tools
Web search, code execution, file management, database access, email, the standard toolkit for digital tasks.
Physical World Access
This is the category most guides miss entirely. Your agent needs humans for physical tasks: deliveries, inspections, research, photography, events, and more.
Payments and Finance
Stripe for payments, RentAHuman for escrow, crypto wallets for on-chain transactions. Your agent needs the ability to send and receive money.
A complete AI agent stack includes physical-world access. Don't build half an agent, give it the full toolkit.
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