OpenAPI articles and guides | Evlio blog · Evlio

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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.
6
posts
, newest first · Updated
2026-09-02
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OpenAPI
Sep 2, 2026
OpenAPI spec and API design editor tools, compared
Swagger Editor, SwaggerHub, Stoplight's tooling, Postman Spec Hub, Insomnia, Apidog, and Redocly all edit an API spec, but they start from different inputs and stop at different points. A researched map of each, sourced.
8
min read
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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
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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
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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
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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
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Engineering
Jul 2, 2026
How Evlio 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
ALL TOPICS
MCP
9
Governance
7
AI Agents
6
OpenAPI
6
Observability
5
Contracts
4
Engineering
4
Product
3
Infrastructure
2
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