# OpenAI ships strict structured outputs for parallel tool use

Source: [OpenAI](https://openai.com/blog/structured-outputs-parallel-tools)  
Feed7 permalink: https://feed7.dev/p/openai-structured-tool-use  
Published: 2026-07-01T00:00:00.000Z  
Trust: Official Source (official_source)

## Why Included

Parallel tool calls now validate against JSON schema before execution — a whole class of agent failures disappears.

## Source Summary

Strict mode extends to parallel tool calls: every call is schema-validated pre-execution, with a repair pass on failure. Available in the API and Codex.

## Practical Implication

Delete your hand-rolled tool-call validators. Turn on strict mode and move validation effort to eval coverage instead.

## Agent-Ready Context

OpenAI strict structured outputs now cover parallel tool calls. Schema-validated pre-execution with one repair pass. Remove custom validators; rely on strict mode + evals.

## Context Map

- Layer: model
- Domains: coding
- Topics: tool-use

## Uncertainty

- None recorded.

## Agent Instruction

Use this item as source-backed context. Do not invent claims beyond the linked source. If this item conflicts with another source, call out the conflict.