OpenAI Agents Developer: Build Custom AI Agents (2026)

An OpenAI agents developer builds AI that takes actions—tool calling, CRM updates, knowledge retrieval—not just a chat box that hallucinates answers.

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Agent Patterns That Ship

| Pattern | Example | | --- | --- | | Tool-calling agent | Book, lookup, create ticket | | RAG knowledge agent | Answer from your docs / FAQ | | Voice + LLM agent | AI receptionist with Vapi/Retell | | Ops agent | Summarize calls → HubSpot note |

Related services: AI developer, AI receptionist.

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Stack I Use

• OpenAI (and Claude/Gemini where they fit)
• LangChain / custom tool routers
• Next.js product surfaces
• n8n or NestJS for side effects
• Vector search for RAG when needed

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Scoping Questions

• What actions can the agent take?
• What must it never do?
• Where does truth live (CRM, docs, DB)?
• Human approval required?
• Latency and cost budget?

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Next Step

Need product AI or a voice agent backed by OpenAI tools? Contact or read voice AI agent for business.