Tried cursor/plugins: A Quick Look at Cursor’s Plugin Ecosystem

The cursor/plugins repository is quickly becoming a useful reference point for AI IDE integrations. It contains Cursor’s plugin specification alongside official plugins, giving developers a more structured way to package reusable tools, workflows, and project-aware automation.

The repository gained +257 stars today, which makes sense: AI coding workflows are moving beyond one-off prompts. Developers want installable, shareable capabilities that can be versioned like normal software.

My quick test-drive setup used Cursor as the client and claude-fable-5 as the primary gateway model through an OpenAI-compatible relay:

{
  "provider": "custom-openai",
  "baseURL": "https://b-lost.com/v1",
  "apiKey": "${B_LOST_API_KEY}",
  "model": "claude-fable-5",
  "temperature": 0.2
}

In Cursor, the same idea is configured through the custom model/provider settings. The important pieces are the /v1 base URL, an API-compatible key, and the exact model identifier exposed by the gateway.

A practical architecture looks like this:

Cursor
  └─ Plugin workflow
      └─ Custom OpenAI-compatible endpoint
          └─ claude-fable-5
              └─ Project context + tool calls

For Anthropic-native integrations, B-Lost’s Universal Relay Core also supports /v1/messages with full prompt caching. That can matter for plugin-heavy workflows where the same repository instructions, schemas, or tool definitions are sent repeatedly: cache hits receive a 90% discount, while the relay lists a 20% discount against official pricing.

The main value of cursor/plugins is not just the current plugin collection. It is the direction: consistent packaging, easier discovery, and a path toward composable AI IDE extensions. If you are building internal developer tools, this is worth watching—and worth testing against your own API gateway rather than relying only on default provider settings.