Struct DelegateDescriptor 

pub struct DelegateDescriptor {
    pub agent_id: String,
    pub instructions: Option<String>,
    pub provider: Arc<DynProvider>,
    pub provider_name: String,
    pub model: String,
    pub tool_specs: Vec<ToolSpec>,
    pub max_steps: usize,
    pub native_search_allowed: bool,
}

A resolved, self-contained worker configuration for one can_delegate_to target (#870).

Built by the control plane at turn dispatch — NEVER by this crate — and threaded down through the wire (TurnInput.delegate_descriptors) and the harness’s tool-executor composition (polyc_turn_runner::resolve_delegate_descriptors) into crate::RunTurnOptions::delegate_descriptors. See crates/control-plane/src/delegate.rs for how the fields here are resolved (provider/model fallback, connector-scope intersection, the read-only-by-default built-in allowlist).

Fields

agent_id: String

The target Agent resource name — matched (trailing-name, mirroring crate::HandoffRequest::child_agent_id’s resolution) against the model’s __delegate_to(target_agent_id, ...) argument to pick this descriptor. See find_descriptor.

instructions: Option<String>

System instructions for the worker’s nested turn. None ⇒ no agent-specific instructions.

provider: Arc<DynProvider>

The worker’s resolved backend, already picked from the deployment’s registered providers — this crate never resolves a provider selector string itself.

provider_name: String

The registry key of Self::provider (e.g. "vertex", "stub") — carried alongside the erased backend so a forensic record (#872, DelegateRecord::resolved_provider) can name the provider without this crate needing a Debug/name accessor on DynProvider itself.

model: String

The worker’s resolved model id.

tool_specs: Vec<ToolSpec>

The worker’s advertised tool specs. Never includes DELEGATE_TOOL_NAME — this is what caps delegation depth at one, since crate::run_turn_with only advertises the delegate tool when its OWN delegate_descriptors option is non-empty, and a nested turn always runs with that option empty.

max_steps: usize

The worker’s step budget, applied to the nested turn’s RunTurnOptions::max_steps.

native_search_allowed: bool

Whether the worker’s nested turn may ground on the provider’s native web-search primitive (RunTurnOptions::native_search_allowed). Derived the same way the parent turn’s own scoping is (#1226): the resolved descriptor’s builtin_tools named polyc_tools::web::NATIVE_SEARCH_GROUNDING — never hardcoded true, since that would hand every worker a capability its own agent manifest never granted.

Trait Implementations

impl Clone for DelegateDescriptor

fn clone(&self) -> DelegateDescriptor

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for DelegateDescriptor

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

Hand-rolled: DynProvider carries no Debug impl (the LlmProvider trait doesn’t require one), so this can’t be #[derive(Debug)]d. Prints tool names, not full specs, to stay short in a turn-level log.