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/**
* @license
* Copyright 2025 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import { Client } from '@modelcontextprotocol/sdk/client/index.js';
import {
BaseTool,
ToolResult,
ToolCallConfirmationDetails,
ToolConfirmationOutcome,
ToolMcpConfirmationDetails,
} from './tools.js';
type ToolParams = Record<string, unknown>;
export const MCP_TOOL_DEFAULT_TIMEOUT_MSEC = 10 * 60 * 1000; // default to 10 minutes
export class DiscoveredMCPTool extends BaseTool<ToolParams, ToolResult> {
private static readonly whitelist: Set<string> = new Set();
constructor(
private readonly mcpClient: Client,
private readonly serverName: string, // Added for server identification
readonly name: string,
readonly description: string,
readonly parameterSchema: Record<string, unknown>,
readonly serverToolName: string,
readonly timeout?: number,
readonly trust?: boolean,
) {
description += `
This MCP tool was discovered from a local MCP server using JSON RPC 2.0 over stdio transport protocol.
When called, this tool will invoke the \`tools/call\` method for tool name \`${name}\`.
MCP servers can be configured in project or user settings.
Returns the MCP server response as a json string.
`;
super(
name,
name,
description,
parameterSchema,
true, // isOutputMarkdown
false, // canUpdateOutput
);
}
async shouldConfirmExecute(
_params: ToolParams,
_abortSignal: AbortSignal,
): Promise<ToolCallConfirmationDetails | false> {
const serverWhitelistKey = this.serverName;
const toolWhitelistKey = `${this.serverName}.${this.serverToolName}`;
if (this.trust) {
return false; // server is trusted, no confirmation needed
}
if (
DiscoveredMCPTool.whitelist.has(serverWhitelistKey) ||
DiscoveredMCPTool.whitelist.has(toolWhitelistKey)
) {
return false; // server and/or tool already whitelisted
}
const confirmationDetails: ToolMcpConfirmationDetails = {
type: 'mcp',
title: 'Confirm MCP Tool Execution',
serverName: this.serverName,
toolName: this.serverToolName,
toolDisplayName: this.name,
onConfirm: async (outcome: ToolConfirmationOutcome) => {
if (outcome === ToolConfirmationOutcome.ProceedAlwaysServer) {
DiscoveredMCPTool.whitelist.add(serverWhitelistKey);
} else if (outcome === ToolConfirmationOutcome.ProceedAlwaysTool) {
DiscoveredMCPTool.whitelist.add(toolWhitelistKey);
}
},
};
return confirmationDetails;
}
async execute(params: ToolParams): Promise<ToolResult> {
const result = await this.mcpClient.callTool(
{
name: this.serverToolName,
arguments: params,
},
undefined, // skip resultSchema to specify options (RequestOptions)
{
timeout: this.timeout ?? MCP_TOOL_DEFAULT_TIMEOUT_MSEC,
},
);
const output = '```json\n' + JSON.stringify(result, null, 2) + '\n```';
return {
llmContent: output,
returnDisplay: output,
};
}
}
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