Packaging

MCPB

Understand MCPB, the MCP Bundle format for packaging local MCP servers with a manifest for one-click installation.

Definition

MCPB is the MCP Bundle packaging format. An MCPB file is a zip-style archive that contains a local MCP server and a manifest describing the server and its capabilities.

How Astrail Uses It

Astrail focuses on hosted endpoints and owned SDK bundles, but MCPB matters when a team wants a portable local server package for desktop clients instead of a hosted HTTP endpoint.

Implementation Checklist

Include a manifest that accurately describes the local server.

Package only the files required to run the server.

Treat install commands and startup commands as a security boundary.

Prefer hosted endpoints when server-side auth, tenancy, or centralized rate limits are required.

FAQ

Is MCPB the same as a hosted MCP endpoint?

No. MCPB packages a local server for installation. A hosted MCP endpoint is a remote HTTP server URL that clients call over the network.

When should I choose MCPB?

Choose MCPB when the integration must run locally, ship as a one-click desktop extension, or access local-only resources under user control.