Class JsonRpcMessage

Namespace

ModelContextProtocol.Protocol

Assembly

ModelContextProtocol.Core.dll

Represents any JSON-RPC message used in the Model Context Protocol (MCP).

[JsonConverter(typeof(JsonRpcMessage.Converter))]
public abstract class JsonRpcMessage

Inheritance

object

JsonRpcMessage

Derived

JsonRpcMessageWithId

JsonRpcNotification

Inherited Members

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.MemberwiseClone()

object.ReferenceEquals(object, object)

object.ToString()

Remarks

This interface serves as the foundation for all message types in the JSON-RPC 2.0 protocol used by MCP, including requests, responses, notifications, and errors. JSON-RPC is a stateless, lightweight remote procedure call (RPC) protocol that uses JSON as its data format.

Properties

Context

Gets or sets the contextual information for this JSON-RPC message.

[JsonIgnore]
public JsonRpcMessageContext? Context { get; set; }

Property Value

JsonRpcMessageContext

Remarks

This property contains transport-specific and runtime context information that accompanies JSON-RPC messages but is not serialized as part of the JSON-RPC payload. This includes transport references, execution context, and authenticated user information.

This property should only be set when implementing a custom ITransport that needs to pass additional per-message context or to pass a User to HandlePostRequestAsync(JsonRpcMessage, Stream, CancellationToken) or OnMessageReceivedAsync(JsonRpcMessage, CancellationToken) .

JsonRpc

Gets or sets the JSON-RPC protocol version used.

[JsonPropertyName("jsonrpc")]
public string JsonRpc { get; set; }

Property Value

string