Agents increasingly draw on specialized human knowledge at inference time, and the infrastructure delivering it is converging around Skills, MCP, and very often a mix of the two. That makes these standards a decision point: provenance either travels with the knowledge or its absence becomes the default.

The MCP community is standardizing two complementary efforts: Interceptors (deterministic hooks in clients, servers, and gateways) and how, why, and when to serve Skills over MCP. This talk shows how the two fit together to standardize attribution for human expertise and other content encoded as Skills and related inference-time formats.