New tools for building agents

Source: OpenAI Date: 2025-03-11 URL: https://openai.com/index/new-tools-for-building-agents

Summary

Summary

OpenAI announced new developer tools for building agents in March 2025 — including the Responses API (which combined chat completions with built-in tool use), the Agents SDK for orchestrating multi-agent workflows, and built-in tools for web search and file analysis. This was a significant API infrastructure expansion designed to make agentic application development more structured and reliable.

Implications

Agentic engineering thread. The March 2025 agent tooling announcement is the most important OpenAI developer platform update since the Assistants API. The Responses API with native tool use, the Agents SDK, and built-in tools represent OpenAI taking over orchestration concerns that developers had been building themselves with frameworks like LangChain and LlamaIndex. This is a platform consolidation move: by providing the agent infrastructure at the API layer, OpenAI makes it easier to build agents on their platform than on open alternatives. The built-in web search and file tools also reduce the number of third-party integrations developers need, increasing OpenAI’s share of the value chain in agentic applications.