Curate a CMS API into 7 Governed Agent Skills with NodeJS

A production CMS is a sprawl of endpoints: content types, entries, media, users, webhooks, plugins, settings, admin routes. Hand an agent all of it and the agent gets worse, not better. The model's tool selection drifts as the list grows, and half the tools are things a publishing assistant should never be able to call. The point of this post is the opposite move. Instead of exposing an API and hoping the agent behaves, you curate a small, labeled surface up front. HazelJS Skillgate does that curation from an OpenAPI spec, and that is the part we actually build and run here. Scope, up front This post is about curation and classification: taking a spec with many endpoints and turning a chosen slice of it into governed skills. Skillgate selects the surface, marks read versus write, and would deny destructive methods if they ever entered that surface. Turning a write's approval flag into a real human-approval pause, and enabling an LLM to drive the skills, are runtime concerns handled elsewhere in Agent OS. This demo does not implement them, and this post does not claim it does. What it does show is the curation, and that stands on its own. The tool-explosion problem Point an LLM at a full CMS API and you hit four problems at once: tool selection degrades as options pile up, throughput drops while the model reasons over a long list, you lose visibility into what the agent can actually do, and dangerous operations sit one bad call away. The demo spec here is deliberately smaller than a real CMS, 27 endpoints rather than hundreds, but the problem is identical. Even 27 is too many, and most of them are things a publishing agent has no business touching. From REST endpoint to agent skill Skillgate's input is an ordinary REST API described by an OpenAPI spec: the same entries, media, and user routes a CMS already exposes. Each endpoint is described in the standard OpenAPI shape, a method, a path, parameters, a description, and tags. Two representative operations from the sp