# Registry

The Ren registry is the public catalog where organizations publish reusable [agents](/docs/deep-dives/concepts/agents/agents/), [skills](/docs/deep-dives/concepts/agents/skills/), [MCPs](/docs/deep-dives/concepts/agents/mcps/), and [blueprints](/docs/deep-dives/concepts/sharing/blueprints/) for anyone to discover and install. It's how a capability moves from a single organization to shared infrastructure.

It's a publishing system, not a marketplace: no ratings or reviews. Organizations publish what they build; others find it by slug and install it.

## Publishers

Every published resource is attributed to a **publisher**: your organization's namespace on the registry, with a unique slug (e.g. `acme-corp`) that prefixes everything you publish. There's one publisher per organization, created automatically the first time you publish.

## Publishing

Publishing makes a resource public and discoverable. When you publish an agent, Ren first publishes everything it depends on (the skills and MCPs on its latest version), so a published resource never has a missing dependency. Publishing a [blueprint](/docs/deep-dives/concepts/sharing/blueprints/) works the same way for the agents, skills, MCPs, and replays it references.

## Deprecation, not deletion

Published resources can't be unpublished. Projects depending on them would break. Instead you **deprecate**: the resource drops out of registry search but stays reachable by direct slug or ID, so existing installs keep working. A deprecation message can point users to a replacement. Deprecation is reversible.

## Discovering

Browse published resources from the CLI, one type at a time:

```bash
ren registries agents list   # browse published agents
ren registries skills list   # browse published skills
ren registries mcps list     # browse published MCPs
ren publishers me            # show your organization's publisher
```

## Where to go next

- [Scopes](/docs/deep-dives/concepts/sharing/scopes/): how publishing changes a resource's visibility.
- [Blueprints](/docs/deep-dives/concepts/sharing/blueprints/): installable setups that bundle agents, skills, and MCPs.
- [Agents](/docs/deep-dives/concepts/agents/agents/): the main resource type published to the registry.