MCP (Model-Client-Protocol) sampling flips the traditional flow of language model requests by allowing servers to initiate requests to clients for completions, creating a more powerful and programmable pattern for using AI inside systems. This protocol enables structured, repeatable AI use with human oversight, bringing transparency, controllability, and audibility to workflows. Key benefits include server-initiated reasoning, human review, and structured, repeatable AI use. MCP sampling works by having the server send a request to the client, which acts as an intermediary between the server, user, and model, allowing humans to preview, edit, and approve requests before they are sent to the model. This process enables automated workflows with manual checkpoints, reproducible, auditable AI decisions, and human + AI collaboration on a per-task basis. MCP sampling is suitable for use cases such as content moderation, customer support, decision-making systems, structured data extraction, and form completion, offering a scalable way to combine AI speed with human judgment without bottlenecks or blind trust. By giving servers the power to think and ask, humans the ability to observe and approve, and teams the ability to build AI flows that are scalable, transparent, and accountable, MCP sampling transforms how AI interacts with systems.