Struct ReActStep 

pub struct ReActStep {
    pub thought: String,
    pub action: String,
    pub observation: String,
    pub step_duration_ms: u64,
}

A single ReAct step: Thought → Action → Observation.

Fields

thought: String

Agent’s reasoning about the current state.

action: String

The action taken (tool name + JSON arguments, or “FINAL_ANSWER”).

observation: String

The result of the action.

step_duration_ms: u64

Wall-clock duration of this individual step in milliseconds. Covers the time from the start of the inference call to the end of the tool invocation (or FINAL_ANSWER detection). Zero for steps that were constructed outside the loop (e.g., in tests).

Implementations

impl ReActStep

pub fn new( thought: impl Into<String>, action: impl Into<String>, observation: impl Into<String>, ) -> Self

Construct a step with zero step_duration_ms.

Primarily useful in tests that need to build [AgentSession] values without running the full ReAct loop.

pub fn is_final_answer(&self) -> bool

Returns true if this step’s action is a FINAL_ANSWER.

pub fn is_tool_call(&self) -> bool

Returns true if this step’s action is a tool call (not a FINAL_ANSWER).

pub fn with_duration(self, ms: u64) -> Self

Set the step_duration_ms field, returning self for chaining.

Useful in tests and benchmarks that need to build AgentSession values with realistic timings without running the full ReAct loop.

pub fn is_empty(&self) -> bool

Return true if all three text fields are empty strings.

pub fn observation_is_empty(&self) -> bool

Return true if the observation string is empty.

Useful for identifying steps where the tool produced no output.

Trait Implementations

impl Clone for ReActStep

fn clone(&self) -> ReActStep

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ReActStep

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for ReActStep

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for ReActStep

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

where __S: Serializer,

Serialize this value into the given Serde serializer.