Treg is a registry and proxy for agent tools, developed by Superdesign. It gives an agent one base URL and token for discovering and calling catalogued endpoints from multiple providers, while also allowing teams to register their own APIs, OAuth connections, vendor CLIs, and SKILL.md bundles. Catalogued calls can use Treg's provider credentials, a team's credentials, or a verified public route; calls are priced per use when Treg's credentials are used.
Its proxy resolves a tool by name or upstream URL, decrypts stored secrets, injects credentials using environment, secret-file, OAuth, or CLI-auth bindings, relays the request, and records an audit event. The proxy is designed to leave upstream requests and responses intact apart from transport and Treg control headers and the injected credentials. The `treg` CLI supports catalog search, tool calls, credential health checks, tool and skill registration, CLI execution, OAuth connections, organizations, and team access controls. It also exposes MCP surfaces for compatible agents and provides a hosted service at treg.to; the server can be self-hosted with the server installation extra. The repository is licensed under Apache 2.0 with additional terms restricting redistribution as a competing hosted registry service.