Enum EngineError 

pub enum EngineError {
    Http(Error),
    Json(Error),
    MissingField(&'static str),
    InvalidField(&'static str),
    Remote(String),
    RemoteStatus(u16, String),
    Unsupported(&'static str),
}

Errors produced by the remote multimodal engine.

This error type is intentionally lightweight and is suitable for surfacing from public APIs.

It covers:

• transport failures when calling the remote endpoint,
• JSON serialization/deserialization failures,
• schema mismatches in OpenAI-compatible responses,
• non-success responses returned by the remote provider,
• unsupported operations due to compile-time feature flags.

Variants

Http(Error)

HTTP-layer failure (request could not be sent, connection error, timeout, etc.).

Json(Error)

JSON serialization/deserialization failure when building or parsing payloads.

MissingField(&'static str)

A required field was missing in a parsed JSON payload.

Example: missing "choices[0].message.content" in an OpenAI-compatible response.

InvalidField(&'static str)

A field was present but had an unexpected type or shape.

Example: "steps" exists but is not an array.

Remote(String)

The remote endpoint returned a non-success status or a server-side error.

The contained string should be a human-readable explanation suitable for logs.

RemoteStatus(u16, String)

The remote endpoint returned a non-success HTTP status with a known status code.

Carries the numeric status code (e.g. 502, 429) so retry logic can distinguish transient/retryable errors from permanent ones.

Unsupported(&'static str)

The operation is not supported in the current build configuration.

Example: calling browser automation without the chrome feature.

Implementations

impl EngineError

pub fn is_retryable_on_different_model(&self) -> bool

Whether this error is transient and warrants retrying on a different model.

Returns true for server errors (500, 502, 503), rate limits (429), and transport-level failures (timeouts, connection resets).

Trait Implementations

impl Debug for EngineError

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

Formats the value using the given formatter.

impl Display for EngineError

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

Formats the value using the given formatter.

impl Error for EngineError

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 EngineError

fn from(e: Error) -> Self

Converts to this type from the input type.

impl From<Error> for EngineError

fn from(e: Error) -> Self

Converts to this type from the input type.