1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
/**
* @license
* Copyright 2025 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import { Client } from '@modelcontextprotocol/sdk/client/index.js';
import { BaseTool, ToolResult } 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> {
constructor(
private readonly mcpClient: Client,
readonly name: string,
readonly description: string,
readonly parameterSchema: Record<string, unknown>,
readonly serverToolName: string,
readonly timeout?: number,
) {
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);
}
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,
},
);
return {
llmContent: JSON.stringify(result, null, 2),
returnDisplay: JSON.stringify(result, null, 2),
};
}
}
|
