--- title: "OpenAPI articles and guides — Elva blog · Elva" description: "OpenAPI is the standard machine-readable description of a REST API; most production APIs have none, or one that drifted. 5 guides, newest first." canonical: "https://getelva.ai/blog/tag/openapi" lastModified: "2026-09-02T16:58:18.662Z" --- 1. [Blog](https://getelva.ai/blog.md) 2. OpenAPI # OpenAPI articles and guides OpenAPI is the standard machine-readable description of a REST API; most production APIs have none, or one that drifted. These guides cover generating a spec from an existing codebase, keeping it true on every commit, and what a spec does and does not tell an agent. 5 posts, newest first · Updated 2026-09-01 [ API Documentation Sep 1, 2026 Automated API documentation without an OpenAPI spec Most API doc platforms assume you already have an OpenAPI file. A researched map of what actually produces a reference doc when you don't: collection imports, AI write-ups, traffic discovery, and code-derived catalogs. 7 min read ](https://getelva.ai/blog/automated-api-documentation-without-openapi-specs.md)[ AI Agents Aug 29, 2026 API discovery platforms and marketplaces for AI agents in 2026 A researched map of how AI agents and the teams building them find and call APIs at scale outside of MCP: public marketplaces, unified-API platforms, and OpenAPI-driven agent tool generation, and where each one stops short of governing who gets to call what. 8 min read ](https://getelva.ai/blog/api-discovery-platforms-for-ai-agents.md)[ Contracts Aug 28, 2026 How teams maintain API contracts without a manual spec A precise map of the tools people reach for to keep an API contract true without hand-writing one: schema-first frameworks, code-reading generators, contract testing, and drift detection, and where each one actually stops. 8 min read ](https://getelva.ai/blog/automatic-api-contracts-without-manual-specs.md)[ OpenAPI Aug 27, 2026 How to generate an OpenAPI spec from existing code Four working ways to get an OpenAPI 3.1 spec out of a codebase that never had one, what each approach misses, and how to keep the result true. 4 min read ](https://getelva.ai/blog/generate-openapi-spec-from-code.md)[ Engineering Jul 2, 2026 How Elva reads a repo: from route handlers to OpenAPI 3.1 Static analysis, framework fingerprints, and the messy middle where code and spec disagree. 11 min read ](https://getelva.ai/blog/how-elva-reads-a-repo.md) ALL TOPICS [MCP9](https://getelva.ai/blog/tag/mcp.md) [Governance7](https://getelva.ai/blog/tag/governance.md) [AI Agents5](https://getelva.ai/blog/tag/ai-agents.md) [OpenAPI5](https://getelva.ai/blog/tag/openapi.md) [Contracts4](https://getelva.ai/blog/tag/contracts.md) [Engineering4](https://getelva.ai/blog/tag/engineering.md) [Observability4](https://getelva.ai/blog/tag/observability.md) [Product3](https://getelva.ai/blog/tag/product.md) [Infrastructure2](https://getelva.ai/blog/tag/infrastructure.md) ## Ship notes, monthly One email with what shipped and what we learned. Unsubscribe anytime. ## Ship APIs anything can call Humans, tests, partners, agents. One catalog, one contract, one place. [Sign up free](https://app.getelva.ai/signup) [Read the blog](https://getelva.ai/blog.md)