Module tools 

Core MCP protocol types and error handling MCP Tools Protocol Types

This module defines the types used for the MCP tools functionality.

Structs

CallToolParams

Parameters for tools/call request (matches TypeScript CallToolRequest.params)

CallToolRequest

Complete tools/call request (matches TypeScript CallToolRequest interface)

CallToolResult

Result for tools/call (per MCP spec)

ListToolsParams

Parameters for tools/list request

ListToolsRequest

Complete tools/list request (matches TypeScript ListToolsRequest interface)

ListToolsResult

Result for tools/list (per MCP spec) - extends PaginatedResult

Tool

Tool definition

ToolAnnotations

Tool annotations structure (matches TypeScript ToolAnnotations) NOTE: all properties in ToolAnnotations are hints. They are not guaranteed to provide a faithful description of tool behavior. Clients should never make tool use decisions based on ToolAnnotations from untrusted servers.

ToolSchema

JSON Schema definition for tool input/output (matches TypeScript spec exactly) Must be an object with type: “object”, properties, and required fields

Type Aliases

ToolResult

Tool result type - an alias for ContentBlock to maintain backward compatibility while ensuring MCP 2025-06-18 specification compliance