Struct SpawnerHints 

pub struct SpawnerHints {
    pub layers: Vec<String>,
}

Set of capability hint keys for the SpawnerLayer required by a Blueprint.

Design rationale (= for the person who will reconstruct this later)

A Blueprint is a pure layer of flow.ir + agent name binding and holds no middleware implementation. Nevertheless there are cases where the caller must be told the BP needs certain capabilities — e.g. “MainAI hook required”, “Operator delegate path required”, operator role mode switching, presence/absence of senior escalation, and so on.

spawner_hints.layers is the place where those capabilities are declared as string keys. The engine-side LayerRegistry (= consumer crate) resolves key → factory and wraps the compiled routes with a SpawnerStack. The Blueprint does not import the concrete MainAIMiddleware type; it exposes intent through strings such as "main_ai" (= separates the pure Flow layer from implementation details).

Canonical hint keys

• "main_ai" → MainAIMiddleware (= fires SpawnHook before/after when kind is MainAi/Composite)
• "senior_escalation" → SeniorEscalationMiddleware (= fires SeniorBridge.ask on worker ok=false)
• "operator_delegate" → OperatorDelegateMiddleware (= delegates the entire spawn to an external Operator.execute)

Behavior of unregistered keys

If the engine-side LayerRegistry has no matching factory, the key is silently skipped (= lenient default). This preserves Blueprint portability (= an unsupported capability in another deployment falls back gracefully).

Fields

layers: Vec<String>

Ordered list of layer hint keys to wrap around the SpawnerStack.

Trait Implementations

impl Clone for SpawnerHints

fn clone(&self) -> SpawnerHints

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for SpawnerHints

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

Formats the value using the given formatter.

impl Default for SpawnerHints

fn default() -> SpawnerHints

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for SpawnerHints

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl JsonSchema for SpawnerHints

fn schema_name() -> Cow<'static, str>

The name of the generated JSON Schema.

fn schema_id() -> Cow<'static, str>

Returns a string that uniquely identifies the schema produced by this type.

fn json_schema(generator: &mut SchemaGenerator) -> Schema

Generates a JSON Schema for this type.

fn inline_schema() -> bool

Whether JSON Schemas generated for this type should be included directly in parent schemas, rather than being re-used where possible using the $ref keyword.

impl PartialEq for SpawnerHints

fn eq(&self, other: &SpawnerHints) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for SpawnerHints

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for SpawnerHints