Execute GraphQL operations (queries and mutations) against the federated system. WARNING: This tool performs remote operations. 'Mutation' operations will modify persistent state; execute these only when a state change is intended. Prerequisites: Verify schema structure using 'introspect-schema' before executing complex queries. Security: Inherits environment-based authentication. Returns: A JSON object containing the execution result ('data') or a list of 'errors' in case of failure.

Retrieve the full GraphQL schema and type definitions. READ-ONLY: This tool is strictly non-destructive. It fetches schema metadata and performs internal conflict resolution based on timestamps in memory. It does not modify, delete, or create data on the remote GraphQL endpoint. Use this for initial discovery and schema analysis before calling 'query-graphql'. Returns a structured JSON object containing type definitions and field specifications. If 'typeNames' is provided, it restricts output to those specific types. CAUTION: For large-scale schemas (e.g., GitHub GraphQL API or @neo4j/graphql models), the response may be truncated or empty if requested without filtering. Always use 'typeNames' to target specific segments when working with complex production schemas.