Struct Step 

pub struct Step {

    pub id: String,
    pub step_index: u32,
    pub type: StepType,
    pub source: StepSource,
    pub target: StepTarget,
    pub status: StepStatus,
    pub content: String,
    pub content_delta: String,
    pub thinking: String,
    pub thinking_delta: String,
    pub tool_calls: Vec<ToolCall>,
    pub error: String,
    pub is_complete_response: Option<bool>,
    pub structured_output: Option<Value>,
    pub usage_metadata: Option<UsageMetadata>,
    pub cascade_id: String,
    pub trajectory_id: String,
    pub http_code: u32,
}

Individual step event recording an action in the agent’s history trajectory.

Fields

id: String

Unique identifier for this step.

step_index: u32

Positional index in the trajectory sequence.

type: StepType

Functional type of the step.

source: StepSource

Originating author.

target: StepTarget

Destination target.

status: StepStatus

Execution status.

content: String

Main text/markdown content associated with the step.

content_delta: String

Text difference delta relative to previous steps.

thinking: String

Reasoning thoughts generated for this step.

thinking_delta: String

Thinking reasoning difference delta relative to previous steps.

tool_calls: Vec<ToolCall>

Custom tool executions registered in this step.

error: String

Captured execution errors.

is_complete_response: Option<bool>

True if this represents the final response segment from the model.

structured_output: Option<Value>

Parsed structured JSON output.

usage_metadata: Option<UsageMetadata>

Token usage details.

cascade_id: String

Unique identifier of the execution cascade grouping subagents.

trajectory_id: String

Sub-agent trajectory grouping identifier.

http_code: u32

HTTP status code (if from a network action).

Trait Implementations

impl Clone for Step

fn clone(&self) -> Step

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Step

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

Formats the value using the given formatter.

impl Default for Step

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for Step

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for Step

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

where __S: Serializer,

Serialize this value into the given Serde serializer.