Struct PolicyEngine 

pub struct PolicyEngine { /* private fields */ }

Combines multiple ActionPolicy instances with a ContextMinimizer into a single evaluation engine.

Policies are evaluated in order. The first deny verdict wins; if none deny, the last warn wins; if none warn, the action is allowed. Session action counters track per-session usage for rate limiting.

Implementations

impl PolicyEngine

pub fn new() -> Self

Create a new policy engine with default context minimization and no policies.

pub fn with_context_minimizer(context_minimizer: ContextMinimizer) -> Self

Create a new policy engine with a custom context minimizer.

pub fn add_policy(&mut self, policy: ActionPolicy)

Add a policy to the engine. Policies are evaluated in insertion order.

pub fn policy_count(&self) -> usize

Return the number of configured policies.

pub fn evaluate_action( &self, action: &AgentAction, tool_def: Option<&ToolDefinition>, session_id: &str, ) -> PolicyDecision

Evaluate an action against all configured policies.

Returns a combined PolicyDecision:

• First deny verdict wins (short-circuit).
• If no deny, the last warn verdict is returned.
• If no violations at all, allow is returned.

Also checks session-level rate limits if any policy has max_actions_per_session configured.

pub fn minimize_context(&self, messages: &[Message]) -> Vec<Message>

Minimize a sequence of messages using the configured context minimizer.

pub fn record_action(&self, session_id: &str)

Record an action for a session (increment counter).

pub fn reset_session(&self, session_id: &str)

Reset the action counter for a session.

Trait Implementations

impl Debug for PolicyEngine

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for PolicyEngine

fn default() -> Self

Returns the “default value” for a type.