Struct ExecutionStep 

pub struct ExecutionStep {
    pub step_number: usize,
    pub timestamp: DateTime<Utc>,
    pub tool: String,
    pub action: String,
    pub parameters_json: String,
    pub result: Option<ExecutionResult>,
    pub latency_ms: u64,
    pub tokens_used: Option<usize>,
    pub metadata: HashMap<String, String>,
}

A single execution step within an episode.

Represents one discrete action or operation performed during task execution.

Postcard Compatibility

The parameters_json field stores JSON as a String to ensure postcard deserialization works correctly. Postcard cannot deserialize serde_json::Value directly. Use parameters() and set_parameters() for JSON value access.

Fields

step_number: usize

Step number in sequence (1-indexed)

timestamp: DateTime<Utc>

When this step was executed

tool: String

Tool or function used

action: String

Description of action taken

parameters_json: String

Input parameters as JSON string (postcard-compatible) Use parameters() to get as serde_json::Value

result: Option<ExecutionResult>

Result of execution

latency_ms: u64

Execution time in milliseconds

tokens_used: Option<usize>

Number of tokens used (if applicable)

metadata: HashMap<String, String>

Additional metadata

Implementations

impl ExecutionStep

pub fn new(step_number: usize, tool: String, action: String) -> Self

Create a new execution step with default values.

pub fn parameters(&self) -> Value

Get parameters as serde_json::Value.

Returns Value::Null if JSON parsing fails.

pub fn set_parameters(&mut self, value: Value)

Set parameters from serde_json::Value.

Converts to JSON string. If serialization fails, sets to empty object.

pub fn with_parameters(self, params: Value) -> Self

Create step with parameters value (builder pattern).

pub fn is_success(&self) -> bool

Check if this step was successful.

impl ExecutionStep

pub fn validate(&self) -> Result<(), String>

Validate that the step has required fields set.

pub fn validate_result(&self) -> Result<(), String>

Validate that the step has a valid result if present.

Trait Implementations

impl Clone for ExecutionStep

fn clone(&self) -> ExecutionStep

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ExecutionStep

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for ExecutionStep

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for ExecutionStep

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for ExecutionStep

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 ExecutionStep