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package main

import "encoding/json"

// JSON-RPC 2.0 request
type JSONRPCRequest struct {
	JSONRPC string          `json:"jsonrpc"`      // must be "2.0"
	ID      *int64          `json:"id,omitempty"` // nil for notifications, non-nil for requests
	Method  string          `json:"method"`
	Params  json.RawMessage `json:"params,omitempty"`
}

// JSON-RPC 2.0 response
type JSONRPCResponse struct {
	JSONRPC string    `json:"jsonrpc"` // always "2.0"
	ID      int64     `json:"id"`      // echo request ID
	Result  any       `json:"result,omitempty"`
	Error   *RPCError `json:"error,omitempty"`
}

// JSON-RPC error object
type RPCError struct {
	Code    int    `json:"code"`
	Message string `json:"message"`
	Data    any    `json:"data,omitempty"`
}

// Standard JSON-RPC error codes
const (
	ErrCodeParseError     = -32700
	ErrCodeInvalidRequest = -32600
	ErrCodeMethodNotFound = -32601
	ErrCodeInvalidParams  = -32602
	ErrCodeInternal       = -32603
)

// MCP tool definition
type Tool struct {
	Name          string          `json:"name"`
	Description   string          `json:"description,omitempty"`
	InputSchema   json.RawMessage `json:"inputSchema"`
	VarlinkMethod string          `json:"-"` // Original Varlink method name (not serialized to JSON)
}

// MCP initialize result
type InitializeResult struct {
	ProtocolVersion string         `json:"protocolVersion"`
	Capabilities    map[string]any `json:"capabilities"`
	ServerInfo      map[string]any `json:"serverInfo,omitempty"`
}

// MCP tools/list result
type ToolsListResult struct {
	Tools []Tool `json:"tools"`
}

// MCP tools/call params
type ToolsCallParams struct {
	Name      string         `json:"name"`
	Arguments map[string]any `json:"arguments,omitempty"`
}

// MCP tools/call result
type ToolsCallResult struct {
	Content []ContentItem `json:"content"`
}

// MCP content item
type ContentItem struct {
	Type string `json:"type"` // "text"
	Text string `json:"text"` // Content text
}