The only schema language AI speaks is JSON Schema (www.sourcemeta.com)

In a significant development for the AI/ML community, all major language model (LLM) providers, including OpenAI, Google, Anthropic, and others, have converged on JSON Schema as the primary schema language for their APIs. This decision underscores the centrality of APIs in AI deployment, with 73% year-over-year growth in AI-related API traffic highlighting their importance. The Structured Outputs feature introduced by OpenAI in August 2024 allows LLMs to produce outputs that conform to a specified JSON Schema, eliminating previous engineering pain points associated with generating valid JSON responses. The shift to JSON Schema enables streamlined communication between AI models and various applications, making it the de facto contract language for AI systems. However, challenges remain as each provider supports different aspects of JSON Schema, leading to inconsistencies and limiting interoperability. The establishment of the Model Context Protocol (MCP) aims to unify tool input definitions under JSON Schema, which is expected to enhance the functionality and efficiency of AI agents. Overall, the adoption of JSON Schema across LLM APIs and related tool frameworks signifies a foundational shift in how AI systems will interact and function, potentially transforming the development landscape for AI applications.