rover

From README

Apollo Rover CLI Guide Rover is the official CLI for Apollo GraphOS. It helps you manage schemas, run composition locally, publish to GraphOS, and develop supergraphs on your local machine. Step 1: Step 2: Authenticate Step 3: Verify Step 4: Initialize a Project (optional) Explore a Graph's Schema (start here for schema questions) To answer "what's in this graph?", find a field, or write a query against a GraphOS graph, fetch the API schema and pipe it into rover schema — this keeps the SDL out of your context and returns only what you need: Three rules that keep this correct: Use rover graph fetch (the API schema) — not rover supergraph fetch (that returns composition SDL with federation internals like join/link). Pipe it in — never run rover graph fetch alone and read the raw SDL (a large schema floods your context; that's exactly what rover schema avoids). The schema commands read piped SDL, not a graph ref — rover schema describe fails; you must fetch first and pipe.