Namespace ModelContextProtocol.Protocol
Classes
- Annotations
Represents annotations that can be attached to content, resources, and resource templates.
- Argument
Represents an argument used in completion requests to provide context for auto-completion functionality.
- AudioContentBlock
Represents audio provided to or from an LLM.
- BlobResourceContents
Represents the binary contents of a resource in the Model Context Protocol.
- CallToolRequestParams
Represents the parameters used with a ToolsCall request from a client to invoke a tool provided by the server.
- CallToolResult
Represents the result of a ToolsCall request from a client to invoke a tool provided by the server.
- CancelTaskRequestParams
Represents the parameters for a
tasks/cancelrequest to signal intent to cancel an in-progress task.
- CancelTaskResult
Represents the result of a
tasks/cancelrequest. This is an empty acknowledgement.
- CancelledNotificationParams
Represents a notification indicating that a request has been cancelled by the client, and that any associated processing should cease immediately.
- CancelledTaskNotificationParams
Task notification for a task that was cancelled.
- CancelledTaskResult
Represents a task that was cancelled before completion.
- ClientCapabilities
Represents the capabilities that a client supports.
- CompleteContext
Represents additional context information for completion requests.
- CompleteRequestParams
Represents the parameters used with a CompletionComplete request from a client to ask a server for auto-completion suggestions.
- CompleteResult
Represents the server's response to a CompletionComplete request, containing suggested values for a given argument.
- CompletedTaskNotificationParams
Task notification for a task that has completed successfully.
- CompletedTaskResult
Represents a task that has completed successfully, carrying the final result.
- Completion
Represents a completion object in the server's response to a CompletionComplete request.
- CompletionsCapability
Represents the completions capability for providing auto-completion suggestions for prompt arguments and resource references.
- ContentBlock
Represents content within the Model Context Protocol (MCP).
- CreateMessageRequestParams
Represents the parameters used with a SamplingCreateMessage request from a server to sample an LLM via the client.
- CreateMessageResult
Represents a client's response to a SamplingCreateMessage from the server.
- CreateTaskResult
Represents the result returned by a server when it creates a task in lieu of a standard result.
- DiscoverRequestParams
Represents the parameters used with a ServerDiscover request.
- DiscoverResult
Represents the result returned from a ServerDiscover request.
- ElicitRequestParams
Represents a message issued from the server to elicit additional information from the user via the client.
- ElicitRequestParams.BooleanSchema
Represents a schema for a Boolean type.
- ElicitRequestParams.EnumSchemaOption
Represents a single option in a titled enum schema with a constant value and display title.
- ElicitRequestParams.LegacyTitledEnumSchema
Represents a legacy schema for an enum type with enumNames.
- ElicitRequestParams.NumberSchema
Represents a schema for a number or integer type.
- ElicitRequestParams.PrimitiveSchemaDefinition
Represents a restricted subset of JSON Schema: ElicitRequestParams.StringSchema, ElicitRequestParams.NumberSchema, ElicitRequestParams.BooleanSchema, ElicitRequestParams.UntitledSingleSelectEnumSchema, ElicitRequestParams.TitledSingleSelectEnumSchema, ElicitRequestParams.UntitledMultiSelectEnumSchema, ElicitRequestParams.TitledMultiSelectEnumSchema, or ElicitRequestParams.LegacyTitledEnumSchema (deprecated).
- ElicitRequestParams.RequestSchema
Represents a request schema used in a form mode elicitation request.
- ElicitRequestParams.StringSchema
Represents a schema for a string type.
- ElicitRequestParams.TitledEnumItemsSchema
Represents the items schema for titled multi-select enum arrays.
- ElicitRequestParams.TitledMultiSelectEnumSchema
Represents a schema for multiple-selection enumeration with display titles for each option.
- ElicitRequestParams.TitledSingleSelectEnumSchema
Represents a schema for single-selection enumeration with display titles for each option.
- ElicitRequestParams.UntitledEnumItemsSchema
Represents the items schema for untitled multi-select enum arrays.
- ElicitRequestParams.UntitledMultiSelectEnumSchema
Represents a schema for multiple-selection enumeration without display titles for options.
- ElicitRequestParams.UntitledSingleSelectEnumSchema
Represents a schema for single-selection enumeration without display titles for options.
- ElicitResult
Represents the client's response to an elicitation request.
- ElicitResult<T>
Represents the client's response to an elicitation request, with typed content payload.
- ElicitationCapability
Represents the capability for a client to provide server-requested additional information during interactions.
- ElicitationCompleteNotificationParams
Represents the parameters used with a ElicitationCompleteNotification notification emitted after a URL-mode elicitation finishes out-of-band.
- EmbeddedResourceBlock
Represents the contents of a resource, embedded into a prompt or tool call result.
- EmptyResult
Represents an empty result object for operations that need to indicate successful completion but don't need to return any specific data.
- FailedTaskNotificationParams
Task notification for a task that failed.
- FailedTaskResult
Represents a task that failed due to a JSON-RPC error during execution.
- FormElicitationCapability
Represents the capability for form-based (in-band) elicitation.
- GetPromptRequestParams
Represents the parameters used with a PromptsGet request from a client to get a prompt provided by a server.
- GetPromptResult
Represents a server's response to a PromptsGet request from the client.
- GetTaskRequestParams
Represents the parameters for a
tasks/getrequest to poll for task completion.
- GetTaskResult
Represents the result of a
tasks/getrequest, containing the full task state.
- Icon
Represents an icon that can be used to visually identify an implementation, resource, tool, or prompt.
- ImageContentBlock
Represents an image provided to or from an LLM.
- Implementation
Provides the name and version of an MCP implementation.
- InitializeRequestParams
Represents the parameters used with a Initialize request sent by a client to a server during the protocol handshake.
- InitializeResult
Represents the result of a Initialize request sent to the server during connection establishment.
- InitializedNotificationParams
Represents the parameters used with a InitializedNotification sent from the client to the server after initialization has finished.
- InputRequest
Represents a server-initiated request that the client must fulfill as part of an MRTR (Multi Round-Trip Request) flow.
- InputRequest.Converter
Provides JSON serialization support for InputRequest.
- InputRequiredException
The exception that is thrown by a server handler to return an InputRequiredResult to the client, signaling that additional input is needed before the request can be completed.
- InputRequiredResult
Represents an input-required result sent by the server to indicate that additional input is needed before the request can be completed.
- InputRequiredTaskNotificationParams
Task notification for a task that requires input from the client.
- InputRequiredTaskResult
Represents a task that requires input from the client before it can proceed.
- InputResponse
Represents a client's response to a server-initiated InputRequest as part of an MRTR (Multi Round-Trip Request) flow.
- InputResponse.Converter
Provides JSON serialization support for InputResponse.
- JsonRpcError
Represents an error response message in the JSON-RPC protocol.
- JsonRpcErrorDetail
Represents detailed error information for JSON-RPC error responses.
- JsonRpcMessage
Represents any JSON-RPC message used in the Model Context Protocol (MCP).
- JsonRpcMessageContext
Contains contextual information for JSON-RPC messages that is not part of the JSON-RPC protocol specification.
- JsonRpcMessageWithId
Represents a JSON-RPC message used in the Model Context Protocol (MCP) and that includes an ID.
- JsonRpcNotification
Represents a notification message in the JSON-RPC protocol.
- JsonRpcRequest
Represents a request message in the JSON-RPC protocol.
- JsonRpcResponse
Represents a successful response message in the JSON-RPC protocol.
- ListPromptsRequestParams
Represents the parameters used with a PromptsList request from a client to request a list of prompts available from the server.
- ListPromptsResult
Represents a server's response to a PromptsList request from the client, containing available prompts.
- ListResourceTemplatesRequestParams
Represents the parameters used with a ResourcesTemplatesList request from a client to request a list of resource templates available from the server.
- ListResourceTemplatesResult
Represents a server's response to a ResourcesTemplatesList request from the client, containing available resource templates.
- ListResourcesRequestParams
Represents the parameters used with a ResourcesList request from a client to request a list of resources available from the server.
- ListResourcesResult
Represents a server's response to a ResourcesList request from the client, containing available resources.
- ListRootsRequestParams
Represents the parameters used with a RootsList request from a server to request a list of roots available from the client.
- ListRootsResult
Represents a client's response to a RootsList request from the server, containing available roots.
- ListToolsRequestParams
Represents the parameters used with a ToolsList request from a client to request a list of tools available from the server.
- ListToolsResult
Represents a server's response to a ToolsList request from the client, containing available tools.
- LoggingCapability
Represents the logging capability configuration for a Model Context Protocol server.
- LoggingMessageNotificationParams
Represents the parameters used with a LoggingMessageNotification notification sent whenever a log message is generated.
- McpExtensions
Provides constants for well-known MCP extension identifiers.
- McpHeaderEncoder
Encodes and decodes parameter values for use in MCP HTTP headers according to the HTTP Standardization SEP.
- MetaKeys
Provides constants for well-known
_metafield keys defined by the MCP protocol and its extensions.
- MissingRequiredClientCapabilityErrorData
Represents the payload for the MissingRequiredClientCapability JSON-RPC error.
- ModelHint
Provides hints to use for model selection.
- ModelPreferences
Represents a server's preferences for model selection, requested of the client during sampling.
- NotificationMethods
Provides constants with the names of common notification methods used in the MCP protocol.
- NotificationParams
Provides a base class for notification parameters.
- PaginatedRequestParams
Provides a base class for paginated requests.
- PaginatedResult
Provides a base class for result payloads that support cursor-based pagination.
- PingRequestParams
Represents the parameters used with a Ping request to verify server connectivity.
- PingResult
Represents the result of a Ping request in the Model Context Protocol.
- ProgressNotificationParams
Represents an out-of-band notification used to inform the receiver of a progress update for a long-running request.
- Prompt
Represents a prompt that the server offers.
- PromptArgument
Represents an argument that a prompt can accept for templating and customization.
- PromptListChangedNotificationParams
Represents the parameters used with a PromptListChangedNotification notification from the server to the client, informing it that the list of prompts it offers has changed.
- PromptMessage
Represents a message within the Model Context Protocol (MCP) system, used for communication between clients and AI models.
- PromptReference
Represents a reference to a prompt, identified by its name.
- PromptsCapability
Represents the server's capability to provide predefined prompt templates that clients can use.
- ReadResourceRequestParams
Represents the parameters used with a ResourcesRead request from a client to get a resource provided by a server.
- ReadResourceResult
Represents a server's response to a ResourcesRead request from the client.
- Reference
Represents a reference to a resource or prompt in the Model Context Protocol.
- RequestMethods
Provides constants with the names of common request methods used in the MCP protocol.
- RequestParams
Provides a base class for all request parameters.
- RequestParamsMetadata
Provides metadata related to the request that provides additional protocol-level information.
- Resource
Represents a known resource that the server is capable of reading.
- ResourceContents
Provides a base class representing contents of a resource in the Model Context Protocol.
- ResourceLinkBlock
Represents a resource that the server is capable of reading, included in a prompt or tool call result.
- ResourceListChangedNotificationParams
Represents the parameters used with a ResourceListChangedNotification notification from the server to the client, informing it that the list of resources it can read from has changed.
- ResourceTemplate
Represents a known resource template that the server is capable of reading.
- ResourceTemplateReference
Represents a reference to a resource or resource template definition.
- ResourceUpdatedNotificationParams
Represents the parameters used with a ResourceUpdatedNotification notification sent whenever a subscribed resource changes.
- ResourcesCapability
Represents the resources capability configuration.
- Result
Provides a base class for result payloads.
- ResultOrCreatedTask<TResult>
Represents the result of a request that supports task-augmented execution, which may be either the standard result or a CreateTaskResult indicating asynchronous processing.
- Root
Represents a root URI and its metadata in the Model Context Protocol.
- RootsCapability
Represents a client capability that enables root resource discovery in the Model Context Protocol.
- RootsListChangedNotificationParams
Represents the parameters used with a RootsListChangedNotification notification from the client to the server, informing it that the list of roots has changed.
- SamplingCapability
Represents the capability for a client to generate text or other content using an AI model.
- SamplingContextCapability
Represents the sampling context capability.
- SamplingMessage
Represents a message issued to or received from an LLM API within the Model Context Protocol.
- SamplingToolsCapability
Represents the sampling tools capability.
- ServerCapabilities
Represents the capabilities that a server supports.
- SetLevelRequestParams
Represents the parameters used with a LoggingSetLevel request from a client to enable or adjust logging.
- StreamClientTransport
Provides an IClientTransport implemented around a pair of input/output streams.
- SubscribeRequestParams
Represents the parameters used with a ResourcesSubscribe request from a client to request real-time notifications from the server whenever a particular resource changes.
- SubscriptionsAcknowledgedNotificationParams
Represents the parameters sent with a SubscriptionsAcknowledgedNotification.
- SubscriptionsListenNotifications
Describes the set of notification types a client wants to receive (or that a server has agreed to deliver) for a SubscriptionsListen subscription.
- SubscriptionsListenRequestParams
Represents the parameters used with a SubscriptionsListen request.
- TaskStatusNotificationParams
Represents the parameters for a
notifications/tasksnotification sent by the server to push task status updates to the client.
- TextContentBlock
Represents text provided to or from an LLM.
- TextResourceContents
Represents text-based contents of a resource in the Model Context Protocol.
- Tool
Represents a tool that the server is capable of calling.
- ToolAnnotations
Represents additional properties describing a Tool to clients.
- ToolChoice
Controls tool selection behavior for sampling requests.
- ToolListChangedNotificationParams
Represents the parameters used with a ToolListChangedNotification notification from the server to the client, informing it that the list of tools it offers has changed.
- ToolResultContentBlock
Represents the result of a tool use, provided by the user back to the assistant.
- ToolUseContentBlock
Represents a request from the assistant to call a tool.
- ToolsCapability
Represents the tools capability configuration. See the schema for details.
- TransportBase
Provides a base class for implementing ITransport.
- UnsubscribeRequestParams
Represents a message sent from the client to cancel resource update notifications from the server for a specific resource.
- UnsupportedProtocolVersionErrorData
Represents the payload for the UnsupportedProtocolVersion JSON-RPC error.
- UpdateTaskRequestParams
Represents the parameters for a
tasks/updaterequest to provide input responses to outstanding server-to-client requests on a task.
- UpdateTaskResult
Represents the result of a
tasks/updaterequest. This is an empty acknowledgement.
- UrlElicitationCapability
Represents the capability for URL mode (out-of-band) elicitation.
- UrlElicitationRequiredErrorData
Represents the payload for the
URL_ELICITATION_REQUIREDJSON-RPC error.
- WorkingTaskNotificationParams
Task notification for a task that is currently being processed.
- WorkingTaskResult
Represents a task that is currently being processed by the server.
Structs
- ProgressToken
Represents a progress token, which can be either a string or an integer.
- RequestId
Represents a JSON-RPC request identifier, which can be either a string or an integer.
Interfaces
- IBaseMetadata
Provides a base interface for metadata with name (identifier) and title (display name) properties.
- ICacheableResult
Represents a result that carries time-to-live (TTL) caching hints, allowing clients to cache the response for a period of time before re-fetching.
- ITransport
Represents a transport mechanism for MCP (Model Context Protocol) communication between clients and servers.
Enums
- CacheScope
Indicates the intended scope of a cached response, analogous to the HTTP
Cache-Control: publicandCache-Control: privatedirectives.
- ContextInclusion
Specifies the context inclusion options for a request in the Model Context Protocol (MCP).
- LoggingLevel
Indicates the severity of a log message.
- McpTaskStatus
Represents the status of an MCP task.
- Role
Represents the type of role in the Model Context Protocol conversation.