# OpenAPI

A standard file that describes every route of an API: its paths, inputs and answers. An agent can read it to learn the API without reading the docs.

Also called OpenAPI spec, Swagger.

Source: https://agentdrives.com/glossary/openapi · as data: https://agentdrives.com/glossary/openapi.json · licence CC BY 4.0

## In our drives

Each drive records whether the product publishes one, and whether the API answered the way its docs say.

How many sites publish one, month by month: https://agentdrives.com/research/adoption?via=md

From the source: Latest OpenAPI Specification release: 3.2.1. (OpenAPI Specification, checked 3 Oct 2026: https://spec.openapis.org/oas/)

## Products with an OpenAPI document

104 of the 151 products we drove.

- [AgentMail](https://agentdrives.com/tools/agentmail.md?via=md): L4 Runs on its own
- [Anchor Browser](https://agentdrives.com/tools/anchorbrowser.md?via=md): L4 Runs on its own
- [Attio](https://agentdrives.com/tools/attio.md?via=md): L4 Runs on its own
- [Browserless](https://agentdrives.com/tools/browserless.md?via=md): L4 Runs on its own
- [Buttondown](https://agentdrives.com/tools/buttondown.md?via=md): L4 Runs on its own
- [ClickHouse Cloud](https://agentdrives.com/tools/clickhouse.md?via=md): L4 Runs on its own
- [Craft](https://agentdrives.com/tools/craft.md?via=md): L4 Runs on its own
- [DocuSeal](https://agentdrives.com/tools/docuseal.md?via=md): L4 Runs on its own

## Related terms

- [MCP](https://agentdrives.com/glossary/mcp.md): Model Context Protocol: an open standard for connecting AI agents to a product's tools and data. A product runs an MCP server, and an agent calls its tools.
- [llms.txt](https://agentdrives.com/glossary/llms-txt.md): A Markdown file on a site that points AI models and agents to the pages that matter, often with plain-text versions of the docs.
- [API key](https://agentdrives.com/glossary/api-key.md): The secret an agent sends with each call to a product's API. Without one, most APIs answer nothing useful.

Every term: https://agentdrives.com/glossary.md