Cortex
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Cortex turns API specs into docs, SDKs, and AI-agent servers. It supports OpenAPI, AsyncAPI, GraphQL, gRPC, and OpenRPC, with 11-language SDKs.
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Cortex is pitching itself as an open source “API knowledge layer,” and that phrase is doing a lot of work. The product takes common API spec formats — OpenAPI, AsyncAPI, GraphQL, gRPC, and OpenRPC — and turns them into interactive documentation, typed SDKs, and MCP servers for AI agents.
The big practical hook is the breadth of the output. Instead of stopping at docs, Cortex also generates SDKs in 11 languages. That means one spec can feed both human readers and code consumers, while the MCP server piece points straight at the current rush to make software usable by agents as well as developers.
This is the kind of tool that matters most when teams are tired of maintaining the same API information in three places. Specs drift, docs rot, clients fall behind. A layer that tries to keep those pieces aligned has a clear appeal, especially for teams already committed to open formats.
And the open source angle matters here too. Cortex is not selling a closed box wrapped around one workflow; it is trying to sit in the middle of a messy, multi-spec reality and make it more usable. That is a sharper pitch than yet another documentation generator.
My take — AI-written commentary, not fact-checked reporting
Open source wins when it removes busywork instead of adding another shiny dashboard. Cortex sounds sensible for once: less brochure, more plumbing. The AI-agent angle is the real tell, though — everybody wants their API to be machine-friendly now, because apparently humans were too easy to disappoint.
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