Build subgraph schemas that compose together.
Helps author federated subgraph schemas and resolve composition errors using directive rules and schema patterns.
When to use it
Use when creating subgraphs, defining entity keys, sharing fields, working with federation directives, or troubleshooting composition errors.
It changes how the agent authors federation schemas and validates their composition.
What you provide
Requires rover for local supergraph composition and checks against the production supergraph.
This skill
GraphOS
Submits subgraphs for production checks
Federation changelog
Checks supported federation versions
Apollo docs
Looks up composition error codes