Module types

Expand description

Complete MCP Protocol Types for 2025-06-18 Specification

This module contains all the core types defined by the Model Context Protocol specification version 2025-06-18, with simplified JSON-RPC (no batching) and enhanced metadata handling.

Modules§

error_codes: Standard JSON-RPC error codes

Structs§

Annotations: Optional annotations for the client. The client can use annotations to inform how objects are used or displayed.
AudioContent: Audio content (2025-06-18)
BaseMetadata: Base interface for metadata with name (identifier) and title (display name) properties.
CallToolResult: Result of a tool execution (2025-06-18 with structured content)
ClientCapabilities: Client capabilities for 2025-06-18
CompletionsCapability: Autocompletion capabilities (2025-03-26)
CreateMessageResult: Result of sampling/createMessage (2025-06-18)
ElicitationCapability: Elicitation capabilities (2025-06-18 NEW)
ElicitationSchema: Restricted schema for elicitation (only top-level properties allowed)
EmbeddedResource: Embedded resource content (2025-06-18)
ErrorObject: Error object
GetPromptResult: Result of prompt execution (2025-06-18 with metadata)
ImageContent: Image content
Implementation: Information about an MCP implementation (2025-06-18 with title support)
JsonRpcError: JSON-RPC error message
JsonRpcNotification: JSON-RPC notification message
JsonRpcRequest: JSON-RPC request message
JsonRpcResponse: JSON-RPC response message
LoggingCapability: Logging capabilities (2025-03-26)
ModelHint: Model hint for model selection (2025-06-18)
ModelPreferences: Model preferences for sampling (2025-06-18 enhanced)
Notification: Base notification with metadata support
NotificationParams: Notification parameters with metadata
PaginatedRequest: Base for paginated requests
PaginatedResult: Base for paginated results
Prompt: Prompt definition
PromptArgument: Argument for a prompt
PromptMessage: Message in a prompt result (2025-06-18 with ContentBlock support)
PromptsCapability: Prompt-related server capabilities
Request: Base request with metadata support
RequestMeta: Request metadata
RequestParams: Request parameters with metadata
Resource: Resource definition
ResourceLink: ResourceLink content (2025-06-18 NEW)
ResourceTemplate: Resource template for URI patterns
ResourcesCapability: Resource-related server capabilities
RootsCapability: Roots capability for clients (2025-06-18)
SamplingCapability: Sampling-related capabilities
SamplingMessage: A message in a sampling conversation (2025-06-18 with ContentBlock)
ServerCapabilities: Server capabilities for 2025-06-18
TextContent: Text content
Tool: Tool definition with annotations and title (2025-06-18)
ToolAnnotations: Tool-specific annotations (2025-06-18 Schema Compliance)
ToolInputSchema: Tool input schema
ToolsCapability: Tool-related server capabilities

Enums§

AnnotationAudience: Annotation audience for content targeting (legacy)
ContentBlock: ContentBlock union type (2025-06-18 complete with ResourceLink)
DangerLevel: Danger level for tool safety annotations (legacy)
ElicitationAction: Elicitation user action
JsonRpcId: JSON-RPC ID type for better type safety
JsonRpcMessage: Complete JSON-RPC message types (2025-06-18)
JsonRpcRequestOrNotification: Request or notification union for compatibility
JsonRpcResponseOrError: Response or error union for compatibility
LoggingLevel: Logging level enumeration (2025-06-18)
PrimitiveSchemaDefinition: Primitive schema definition for elicitation
ResourceContents: Content of a resource (2025-06-18)
Role: Message role
SamplingContent: Content types allowed in sampling (subset of ContentBlock)
StopReason: Reasons why sampling stopped

Constants§

JSONRPC_VERSION
LATEST_PROTOCOL_VERSION: MCP Protocol version (2025-06-18)
PROTOCOL_VERSION

Type Aliases§

ClientInfo
Content
Cursor: Cursor for pagination
JsonRpcBatchRequest: Batch request type alias for compatibility
JsonRpcBatchResponse: Batch response type alias for compatibility
ProgressToken: Progress token for associating notifications with requests
PromptInfo
PromptResult
RequestId: Request ID for JSON-RPC correlation
ResourceInfo
ServerInfo
ToolInfo
ToolResult