{"id":"modelcontextprotocol-mcpb","name":"mcpb","af_score":50.0,"security_score":20.2,"reliability_score":38.8,"what_it_does":"MCP Bundles (MCPB) is a TypeScript/Node.js toolchain and bundle format for packaging a local MCP server into a single .mcpb (zip) archive with a manifest.json describing server entrypoints and capabilities. It includes a CLI (mcpb init/pack) and reference code used by Claude for macOS/Windows to load, verify, and provide single-click installation with related end-user features like updates and configuration.","best_when":"You want to ship a local MCP server to desktop users and have host apps implement MCPB bundle installation and configuration.","avoid_when":"You need a hosted, network-accessible service with server-side authentication, rate limiting, and SLAs; MCPB primarily targets local execution and distribution format interoperability.","last_evaluated":"2026-03-30T13:23:16.536050+00:00","has_mcp":false,"has_api":false,"auth_methods":[],"has_free_tier":false,"known_gotchas":["mcpb bundles are zip archives; incorrect manifest.json fields or mismatched server.entry_point/runtime.type may cause host verification/install failures","Host apps (e.g., Claude for macOS/Windows) implement installation/verification logic; behavior and constraints may differ across hosts and bundle types","Packaging entire node_modules into a bundle can increase size and may cause unexpected runtime issues on the host if dependencies or binaries are incompatible with the platform"],"error_quality":0.0}