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ContentItem

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Content item for MCP tool results

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JsonRpcRequest

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JsonRpcResponse

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JsonSchema

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MCPError

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MCP protocol-level errors These follow the JSON-RPC 2.0 error code conventions.

Error code allocation (per 2026-07-28 spec):
  • -32700, -32600..-32603: standard JSON-RPC 2.0
  • -32000..-32019: legacy/implementation-defined (no new allocations)
  • -32020..-32099: reserved for the MCP specification

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ParamDef

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Parameter definition for tool schema

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Params

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ServerCapabilities

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ServerInfo

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Tool

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Core Tool trait following MCP protocol

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ToolDefinition

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ToolError

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ToolResult

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Tool execution result following MCP protocol format

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TransportError

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Transport-level errors These occur at the communication layer (network, IO, etc.)

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get_number

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fn get_number(json : Json, key : String) -> Result[Double, 
ToolResult]

Extract number from JSON, returning error ToolResult on failure

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get_optional_number

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fn get_optional_number(json : Json, key : String) -> Result[Double?, 
ToolResult]

Extract optional number from JSON

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get_optional_string

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fn get_optional_string(json : Json, key : String) -> Result[String?, 
ToolResult]

Extract optional string from JSON

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get_string

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fn get_string(json : Json, key : String) -> Result[String, 
ToolResult]

Extract string from JSON, returning error ToolResult on failure

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simple_tool

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fn simple_tool(name : String, description : String, handler : (Json) -> 
ToolResult) -> 
ToolWrapper

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tool_fn

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fn[Args : 
Params, Ret : 
ToToolResult] tool_fn(handler : (Args) -> Ret, name~ : String, description~ : String) -> 
ToolWrapper

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