Struct PolicyState 

pub struct PolicyState { /* private fields */ }

A policy whose per-tool JSON Schema validators are compiled ONCE, so a caller evaluating many tool calls against the same policy does not recompile per call (jsonschema::validator_for is the expensive step). evaluate_tool_args stays the one-shot convenience that compiles on the fly; this is the compile-once path for hot loops, matching how the MCP proxy compiles all schemas at policy load. Verdicts are identical to evaluate_tool_args for the same policy and call.

Implementations

impl PolicyState

pub fn compile(policy: &Value) -> Self

Compile every tool schema in the policy once. A tool whose schema fails to compile is recorded as an error and only surfaces (as E_SCHEMA_COMPILE) if that tool is later evaluated, matching the one-shot evaluate_tool_args behavior of only compiling the requested tool’s schema.

pub fn evaluate(&self, tool_name: &str, tool_args: &Value) -> Verdict

Evaluate one tool call against the pre-compiled validators.