MCP Gateway with Curated GraphQL Persisted Operations

Connecting APIs to Large Language Models (LLMs) through the Model Context Protocol (MCP) is more efficient and secure when using a GraphQL facade with Persisted Operations (POs) rather than raw REST endpoints. REST APIs, while beneficial for developers and internal services, pose challenges for LLMs due to their granular and sprawling nature, leading to inefficiencies, context overload, and security risks. GraphQL, on the other hand, offers a unified schema and task-oriented approach, addressing these issues by combining microservices into a single, machine-readable schema and allowing precise data fetching. Persisted Operations enhance security and predictability by allowing only predefined queries and mutations, ensuring task-level granularity, controlled context, and governance, which are crucial for stable tool usage and consistent operation contracts. This approach abstracts complexity and provides a stable, predictable interface, making it particularly effective for connecting APIs to LLMs via MCP.