Struct PolicyEngine 

pub struct PolicyEngine {
    pub max_retries: u32,
    pub min_delay_ms: u32,
    pub max_delay_ms: u32,
    /* private fields */
}

Internal policy engine that unifies retry / fallback behavior.

Important constraints:

• Keep this internal (no public API commitments yet).
• Prefer deterministic, explainable behavior over clever heuristics.

Fields

max_retries: u32

min_delay_ms: u32

max_delay_ms: u32

Implementations

impl PolicyEngine

pub fn new(manifest: &ProtocolManifest) -> PolicyEngine

pub fn validate_capabilities( &self, request: &UnifiedRequest, ) -> Result<(), Error>

Validates if the manifest supports all capabilities required by the request.

This is a pre-flight guard that validates user intent against protocol capabilities before making any network requests, saving latency and cost.

pub fn pre_decide( &self, signals: &SignalsSnapshot, has_fallback: bool, ) -> Option<Decision>

Optional pre-decision based on current runtime signals (facts), before attempting a call.

Keep this conservative: only skip work that is known to fail right now.

pub fn decide( &self, err: &Error, attempt: u32, has_fallback: bool, ) -> Result<Decision, Error>

Decide what to do next after an attempt failed.

• attempt is 0-based (first failure => attempt=0).
• has_fallback indicates there is another candidate to try.