muster
An aggregating Model Context Protocol server that exposes every MCP server an organization runs through one authenticated endpoint, with meta-tool discovery, OAuth 2.1 single sign-on and Kubernetes custom resources.
muster is an aggregating MCP server that connects to the MCP servers an organization already runs, such as a factory's maintenance system, a service desk, a CRM and ERP, Kubernetes and Prometheus, or other in-house tools, and serves all of their tools through one MCP endpoint. Rather than loading hundreds of tool definitions, an AI agent connects once and discovers tools through a small set of meta-tools such as list_tools, filter_tools, describe_tool and call_tool, with listings paged and ranked by relevance so finding the right tool costs only a few hundred tokens.
A request declares which tools it may see and call through a toolset header, using built-in presets, operator-defined presets, or inline selectors by server, pattern, workflow or label, so an agent runs with exactly the surface it was given. muster protects its endpoint as an OAuth 2.1 resource server in front of Dex, keeping one session per person and forwarding that person's identity token to downstream MCP servers so every call is made under their own identity. It runs as a single binary on a laptop bridging an IDE to local and remote MCP servers, or as a Kubernetes service with custom resources and a Helm chart, and can turn multi-step procedures into deterministic workflow tools.
It is written in Go and licensed under Apache-2.0.