---
id: api-openapi-arazzo-workflows-and-overlays
title: 'API OpenAPI Arazzo Workflows and Overlays'
schema_type: TechArticle
category: computer-science
language: en
confidence: medium
last_verified: '2026-06-03'
created_date: '2026-06-03'
generation_method: ai_structured
derived_from_human_seed: true
conflict_of_interest: none_declared
is_live_document: false
data_period: static
atomic_facts:
  - id: fact-cs-api-openapi-arazzo-workflows-and-overlays-1
    statement: >-
      The Arazzo Specification provides a mechanism for defining sequences of API
      calls and their dependencies in the context of API descriptions.
    source_title: Arazzo Specification
    source_url: https://spec.openapis.org/arazzo/latest.html
    confidence: medium
  - id: fact-cs-api-openapi-arazzo-workflows-and-overlays-2
    statement: >-
      The Arazzo Specification says an Arazzo description must contain at least
      one workflow in its workflows fixed field.
    source_title: Arazzo Specification
    source_url: https://spec.openapis.org/arazzo/latest.html
    confidence: medium
  - id: fact-cs-api-openapi-arazzo-workflows-and-overlays-3
    statement: >-
      The OpenAPI Overlay Specification defines a document format for updating an
      OpenAPI description through structured overlay actions.
    source_title: OpenAPI Overlay Specification
    source_url: https://spec.openapis.org/overlay/latest.html
    confidence: medium
completeness: 0.82
known_gaps:
  - Workflow descriptions and overlays still need runtime auth, environment variables, secret handling, idempotency, rollback behavior, and test fixtures before agents can execute API flows safely.
disputed_statements: []
primary_sources:
  - title: Arazzo Specification
    type: standard
    year: 2026
    url: https://spec.openapis.org/arazzo/latest.html
    institution: OpenAPI Initiative
  - title: OpenAPI Overlay Specification
    type: standard
    year: 2026
    url: https://spec.openapis.org/overlay/latest.html
    institution: OpenAPI Initiative
secondary_sources: []
updated: '2026-06-03'
ai_models:
  - gpt-5-codex
---

## TL;DR

Arazzo workflows and OpenAPI overlays give API agents machine-readable context beyond single endpoint schemas.

## Core Explanation

OpenAPI describes operations, but agents often need to perform multi-step workflows: create a resource, poll status, fetch output, and handle failure. Arazzo can describe those steps and dependencies. Overlays can layer metadata or changes onto an existing OpenAPI description without rewriting the source file.

Agents should treat these artifacts as planning evidence, not permission to act. They still need scoped credentials, environment selection, idempotency rules, retry policy, and human approval for high-impact operations.

## Source-Mapped Facts

- The Arazzo Specification provides a mechanism for defining sequences of API calls and their dependencies in the context of API descriptions. ([source](https://spec.openapis.org/arazzo/latest.html))
- The Arazzo Specification says an Arazzo description must contain at least one workflow in its workflows fixed field. ([source](https://spec.openapis.org/arazzo/latest.html))
- The OpenAPI Overlay Specification defines a document format for updating an OpenAPI description through structured overlay actions. ([source](https://spec.openapis.org/overlay/latest.html))

## Further Reading

- [Arazzo Specification](https://spec.openapis.org/arazzo/latest.html)
- [OpenAPI Overlay Specification](https://spec.openapis.org/overlay/latest.html)