Enum A2AError 

pub enum A2AError {
    JsonRpc {
        code: i32,
        message: String,
        data: Option<Value>,
    },
    JsonParse(Error),
    InvalidRequest(String),
    InvalidParams(String),
    MethodNotFound(String),
    TaskNotFound(String),
    TaskNotCancelable(String),
    PushNotificationNotSupported,
    UnsupportedOperation(String),
    ContentTypeNotSupported(String),
    InvalidAgentResponse(String),
    AuthenticatedExtendedCardNotConfigured,
    Internal(String),
    ValidationError {
        field: String,
        message: String,
    },
    VersionConflict {
        id: String,
        expected: u64,
        actual: u64,
    },
    DatabaseError(String),
    Io(Error),
}

Error type for the A2A protocol operations

Variants

JsonRpc

Fields

code: i32

message: String

data: Option<Value>

JsonParse(Error)

InvalidRequest(String)

InvalidParams(String)

MethodNotFound(String)

TaskNotFound(String)

TaskNotCancelable(String)

PushNotificationNotSupported

UnsupportedOperation(String)

ContentTypeNotSupported(String)

InvalidAgentResponse(String)

AuthenticatedExtendedCardNotConfigured

Internal(String)

ValidationError

Fields

field: String

message: String

VersionConflict

Fields

id: String

expected: u64

actual: u64

DatabaseError(String)

Io(Error)

Implementations

impl A2AError

pub fn to_jsonrpc_error(&self) -> Value

Convert an A2AError to a JSON-RPC error value

pub fn reason_code(&self) -> &'static str

Stable, machine-readable reason code for this error (SCREAMING_SNAKE_CASE, used as the ErrorInfo.reason on the wire).

pub fn error_details(&self) -> Vec<ErrorDetail>

Typed details for the JSON-RPC error.data array.

Validation failures surface as a Google-RPC BadRequest with field violations; version conflicts attach the expected/actual versions as ErrorInfo metadata; every other variant carries at least its stable reason_code as an ErrorInfo, so a client can branch on a machine code instead of parsing the message string.

Trait Implementations

impl Debug for A2AError

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

Formats the value using the given formatter.

impl Display for A2AError

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

Formats the value using the given formatter.

impl Error for A2AError

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 A2AError

fn from(source: Error) -> Self

Converts to this type from the input type.

impl From<Error> for A2AError

fn from(source: Error) -> Self

Converts to this type from the input type.

impl From<HttpClientError> for A2AError

Available on crate features http-client or jsonrpc-client only.

fn from(error: HttpClientError) -> Self

Converts to this type from the input type.

impl From<HttpServerError> for A2AError

Available on crate feature http-server only.

fn from(error: HttpServerError) -> Self

Converts to this type from the input type.