Structured Authority Injection: Persistent Human Control for LLM Agents via Typed MCP Overrides

Structured Authority Injection (SAI) is a protocol that enables human operators to inject binding directives into LLM agents through typed, schema-validated Model Context Protocol (MCP) tool calls, maintaining a ranked authority context prepended to each prompt. SAI defines three override classes—Constraint, Priority, and Strategy—with distinct persistence semantics and an explicit precedence order enforced via a directed authority channel inaccessible to the planning process. The method requires no model fine-tuning or access to model weights and applies to instruction-tuned LLMs supporting MCP tool use.