Struct ExecutionError 

pub struct ExecutionError {
    pub category: ExecutionErrorCategory,
    pub message: String,
    pub retry_policy: RetryPolicy,
    pub code: Option<String>,
    pub attempt: u32,
    pub step_id: Option<StepId>,
    pub provider: Option<String>,
    pub http_status: Option<u16>,
    pub details: Option<Value>,
    pub occurred_at: i64,
}

The primary error type for all execution failures

This structured error enables:

1. Deterministic retry decisions
2. Accurate billing (distinguishes user errors from system errors)
3. Compliance narratives (full audit trail)
4. HTTP/gRPC status code mapping

Fields

category: ExecutionErrorCategory

High-level error category

message: String

Human-readable error message

retry_policy: RetryPolicy

Retry policy for this error

code: Option<String>

Specific error code within the category

attempt: u32

Attempt number (1-indexed, for tracking retries)

step_id: Option<StepId>

Step ID where the error occurred

provider: Option<String>

Provider name (for LLM/Tool errors)

http_status: Option<u16>

HTTP status code (if applicable)

details: Option<Value>

Additional structured details

occurred_at: i64

Timestamp when error occurred (milliseconds since epoch)

Implementations

impl ExecutionError

pub fn new(category: ExecutionErrorCategory, message: impl Into<String>) -> Self

Create a new ExecutionError with default retry policy for the category

pub fn with_code(self, code: impl Into<String>) -> Self

Set the error code

pub fn with_attempt(self, attempt: u32) -> Self

Set the attempt number

pub fn with_step_id(self, step_id: StepId) -> Self

Set the step ID

pub fn with_provider(self, provider: impl Into<String>) -> Self

Set the provider name

pub fn with_http_status(self, status: u16) -> Self

Set the HTTP status code

pub fn with_details(self, details: Value) -> Self

Set additional details

pub fn with_retry_policy(self, policy: RetryPolicy) -> Self

Override the retry policy

pub fn llm(code: LlmErrorCode, message: impl Into<String>) -> Self

Create an LLM error

pub fn tool(code: ToolErrorCode, message: impl Into<String>) -> Self

Create a tool error

pub fn policy_violation(message: impl Into<String>) -> Self

Create a policy violation error

pub fn timeout(message: impl Into<String>) -> Self

Create a timeout error

pub fn quota_exceeded(message: impl Into<String>) -> Self

Create a quota exceeded error

pub fn kernel_internal(message: impl Into<String>) -> Self

Create a kernel internal error

pub fn validation(message: impl Into<String>) -> Self

Create a validation error

pub fn network(message: impl Into<String>) -> Self

Create a network error

pub fn is_retryable(&self) -> bool

Check if this error is retryable

pub fn is_fatal(&self) -> bool

Check if this error is fatal (will never be retried)

pub fn should_retry(&self) -> bool

Check if a retry should be attempted

pub fn retry_delay(&self) -> Duration

Get the delay before the next retry attempt

pub fn next_attempt(self) -> Self

Create a new error for the next retry attempt

pub fn to_http_status(&self) -> u16

Map to HTTP status code

Trait Implementations

impl Clone for ExecutionError

fn clone(&self) -> ExecutionError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ExecutionError

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for ExecutionError

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for ExecutionError

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

Formats the value using the given formatter.

impl Error for ExecutionError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0: use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0: replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl From<Error> for ExecutionError

fn from(err: Error) -> Self

Converts to this type from the input type.

impl From<Error> for ExecutionError

fn from(err: Error) -> Self

Converts to this type from the input type.

impl From<Error> for ExecutionError

fn from(err: Error) -> Self

Converts to this type from the input type.

impl Serialize for ExecutionError

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

where __S: Serializer,

Serialize this value into the given Serde serializer.