Struct JsonRpcError 

pub struct JsonRpcError {
    pub code: i64,
    pub message: String,
    pub data: Option<Value>,
}

The error member of a failed JsonRpcResponse.

Protocol-level failure (unknown method, bad params, panic). A tool that fails still returns a successful response carrying a ToolCallResult with is_error: true — that distinction is MCP’s, not ours: the model sees tool errors, the client sees protocol ones.

Fields

code: i64

Numeric error code; see METHOD_NOT_FOUND, INVALID_PARAMS, INTERNAL_ERROR.

message: String

Human-readable description of what went wrong.

data: Option<Value>

Optional structured detail; this server never sets it.

Trait Implementations

impl Debug for JsonRpcError

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

Formats the value using the given formatter.

impl Serialize for JsonRpcError

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

where __S: Serializer,

Serialize this value into the given Serde serializer.