Short answer. Most working agentic systems are built from a few repeatable patterns. Five that hold up in practice: (1) a single agent with tools, (2) a human-approval gate, (3) an orchestrator with specialist sub-agents, (4) a retrieval-grounded agent, and (5) a guardrailed, compliance-checked agent. Most real builds combine several.
The five patterns
- Single agent with tools. One agent that can search, read files, run code, or call an API. Simple, transparent, and enough for most tasks.
- Human-approval gate (keeper in the loop). The agent prepares; a human reviews and approves before anything is sent, published, or acted on. The default for anything consequential.
- Orchestrator + specialists. A lead agent breaks a goal into parts and hands each to a focused sub-agent (research, modeling, drafting), then assembles the result.
- Retrieval-grounded (RAG). The agent answers from your verified documents and data rather than from memory, which sharply reduces ‘hallucination’ on facts that matter.
- Guardrailed / compliance-checked. A monitoring layer that flags where a licensed professional or a human decision is legally required, and that enforces disclosures and boundaries before output ships.
How to choose
Start with the simplest pattern that does the job (often #1 + #2), and add orchestration, retrieval, or guardrails only where the work demands it. Complexity is a cost; add it deliberately.
Related: What is an agentic AI audit? · The A.G.E.N.T. framework
About this resource. Written and human-reviewed by George Howell Ward, who builds with agentic AI in real estate, finance, and construction and treats compliance as the cornerstone of how a digital persona faces the world. He is a licensed Arizona real estate agent (Salesperson SA528635000, Landmark ACM, LLC); he is not an attorney, CPA, registered investment adviser, securities broker, or clinician. The A.G.E.N.T. framework referenced here is the work of Dr. Ulla Kruhse-Lehtonen and Dirk Hofmann (DAIN Studios), used with the authors’ permission; reference does not imply their endorsement.
Important — please read. General educational and operational information only — not legal, financial, tax, accounting, or investment advice, and not a substitute for a licensed professional in your jurisdiction. George Howell Ward does not solicit investors and takes no transaction-based or finder compensation; Series 82 is a future-targeted credential (~2027) that is NOT currently held. AI-assisted content, human-reviewed (EU AI Act Article 50 posture).