DanLevy Consulting This document defines the "llm" Uniform Resource Identifier (URI) scheme for identifying Large Language Model (LLM) endpoints and their configuration. The scheme encodes provider host, model identifier, authentication credentials, and inference parameters into a single, portable connection string, analogous to database connection URIs such as those used by PostgreSQL and MongoDB. This document registers the scheme name in the IANA "Uniform Resource Identifier (URI) Schemes" registry as a provisional registration per RFC 7595.