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MCP Catalog Overview

The MCP Catalog is Velerion’s registry of Model Context Protocol servers. It answers two questions that every team hits once more than one agent is in production: which tools are approved here, and who is allowed to attach them to what.

How it is organised

Section titled “How it is organised”
  • Public catalog — servers published and maintained by Velerion and by verified vendors.
  • Workspace catalog — servers your organisation has approved, including private forks of public entries and internal servers that are never published outside the workspace.
  • Pinned versions — every attachment records an exact server version. Catalog updates never change a running agent until you promote the new version.

Anatomy of a catalog entry

Section titled “Anatomy of a catalog entry”
Field Meaning
id Stable identifier, for example velerion/postgres.
version Semantic version of the server implementation.
transport stdio, streamable-http or sse.
tools Declared tool names, argument schemas and side-effect class.
scopes Credentials the server requires from the connection it is bound to.
review Velerion security review status and the date it was last re-checked.

Read-only by default

Section titled “Read-only by default”

Every tool in a catalog entry declares whether it mutates state. Newly attached servers are exposed to agents with mutating tools disabled; an admin enables them explicitly per environment.

Next steps

Section titled “Next steps”