Model Context Protocol (MCP) represents a significant advancement in interfacing software with AI models, particularly large language models (LLMs) and autonomous agents, by evolving from traditional API frameworks like SOAP, REST, and GraphQL. MCP adapts these frameworks for a dynamic environment where language models interpret and enact capabilities, raising concerns about safety, precision, and scalability. Unlike deterministic APIs, MCP relies on probabilistic reasoning, requiring meticulous design to ensure reliability and efficient resource use, as poorly defined tools can lead to excessive operational costs. Key considerations include the granularity of tools, the quality of tool descriptions for model comprehension, and the importance of consistent semantics to prevent reasoning failures. The parallels with API management, such as rate limiting and circuit breaking, remain relevant but need adaptation to fit MCP’s unique challenges. Testing MCP tools involves synthetic test suites and human oversight due to the variability in model reasoning. Thoughtful design, observability, and well-defined capabilities are crucial for building robust MCP systems that are cost-effective and reliable, emphasizing the need for clear communication of tool intent to autonomous agents.