Struct WorkflowNode 

pub struct WorkflowNode {
    pub task: RuntimeTask,
    pub role: AgentRole,
    pub isolation: AgentIsolation,
    pub context_inheritance: ContextInheritance,
    pub model_hint: Option<String>,
    pub trust: NodeTrust,
    pub output_schema: Option<Value>,
    pub kind: NodeKind,
    pub token_budget: Option<u64>,
    pub max_turns: Option<u32>,
    pub max_wall_ms: Option<u64>,
    pub depends_on: Vec<usize>,
}

One node in a workflow DAG: a task plus the contract its agent runs under.

Fields

task: RuntimeTask

role: AgentRole

isolation: AgentIsolation

context_inheritance: ContextInheritance

model_hint: Option<String>

Optional model preference (e.g. “opus” / “sonnet”); the SDK resolves it. See W4.

trust: NodeTrust

W3 trust level. Default Trusted.

output_schema: Option<Value>

G3 structured output: an optional JSON Schema the node’s agent output must conform to. The kernel is zero-I/O and never validates it — it carries the schema verbatim to the spawn descriptor so the SDK can instruct the agent and validate/retry on its result (the structured “summary only” contract from image 8 is enforced SDK-side; the kernel owns the contract). Additive: omitted on the wire when absent.

kind: NodeKind

Control-flow kind. Default Spawn (run once).

token_budget: Option<u64>

M4/G5: optional per-node cumulative token cap. The kernel carries it to the spawn descriptor; the SDK sets the node’s child-run max_total_tokens to it, so an expensive node self-terminates at the cap (the “use N tokens” budget, applied per node). Additive: omitted on the wire when None.

max_turns: Option<u32>

O3 per-node turn cap: the SDK sets the child run’s max_turns (falls back to the parent’s). Mirrors token_budget — same hop chain, additive ABI.

max_wall_ms: Option<u64>

O3 per-node wall-clock cap (ms): the SDK sets the child run’s timeout. Additive ABI.

depends_on: Vec<usize>

Indices into WorkflowSpec::nodes this node depends on.

Implementations

impl WorkflowNode

pub fn new(task: RuntimeTask, role: AgentRole) -> WorkflowNode

A node with role-default isolation/inheritance and no dependencies.

pub fn with_token_budget(self, tokens: u64) -> WorkflowNode

M4/G5: cap this node’s child run at tokens cumulative tokens.

pub fn with_max_turns(self, turns: u32) -> WorkflowNode

O3: cap this node’s child run at turns provider turns.

pub fn with_max_wall_ms(self, ms: u64) -> WorkflowNode

O3: cap this node’s child run at ms wall-clock milliseconds.

pub fn with_loop(self, max_iters: usize) -> WorkflowNode

Make this a loop node: re-run the agent up to max_iters times before completing. Dependents wait for the whole loop to finish.

pub fn with_classify(self, branches: Vec<ClassifyBranch>) -> WorkflowNode

Make this a classify node: its result selects one of branches to run; the rest are pruned.

pub fn with_tournament(self, entrants: Vec<RuntimeTask>) -> WorkflowNode

Make this a tournament controller node: it spawns no agent of its own but generates each of entrants (in parallel), then pairwise-judges them to a single winner. The node’s own task.goal is the judging criterion handed to every judge. Requires ≥2 entrants.

pub fn with_reduce(self, reducer: impl Into<String>) -> WorkflowNode

G2: make this a deterministic reduce node — it runs no LLM agent; the SDK routes it to the registered reducer function over its dependencies’ outputs (dedupe / filter / merge). Give it depends_on the nodes whose outputs it consumes.

pub fn with_depends_on(self, depends_on: Vec<usize>) -> WorkflowNode

pub fn with_isolation(self, isolation: AgentIsolation) -> WorkflowNode

pub fn with_model_hint(self, hint: impl Into<String>) -> WorkflowNode

pub fn with_trust(self, trust: NodeTrust) -> WorkflowNode

W3: mark this node’s trust level. Quarantined nodes read untrusted content and are kernel-enforced to read-only (a quarantined node declaring write isolation is denied).

pub fn quarantined(self) -> WorkflowNode

Mark this node as quarantined (reads untrusted content, runs without privileges).

pub fn with_output_schema(self, schema: Value) -> WorkflowNode

G3: require this node’s output to conform to a JSON Schema. The kernel carries it verbatim to the spawn descriptor; the SDK instructs the agent and validates/retries on its result.

Trait Implementations

impl Clone for WorkflowNode

fn clone(&self) -> WorkflowNode

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for WorkflowNode

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for WorkflowNode

fn deserialize<__D>( __deserializer: __D, ) -> Result<WorkflowNode, <__D as Deserializer<'de>>::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for WorkflowNode

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

where __S: Serializer,

Serialize this value into the given Serde serializer.