Function factory

packages/plugins/mcp/src/testing/server.ts:514–543

()

  };

  const factory = () => {
    const server = new McpServer({ name: serverName, version: "1.0.0" }, { capabilities: {} });
    const registered = server.registerTool(
      currentToolName,
      {
        description: "Greets the caller",
        inputSchema: { name: z.string() },
      },
      async ({ name }: { name: string }) => ({
        content: [{ type: "text" as const, text: `greeting:${name}` }],
      }),
    );
    registrations.add(registered);
    server.registerTool(
      "rename_greet",
      { description: "Renames the greet tool", inputSchema: {} },
      async (_args, extra) => {
        renameTool();
        // `RegisteredTool.update` already emitted list_changed, but with no
        // relatedRequestId the transport routes it to the standalone GET SSE
        // stream, which a request-scoped client may never have open. Send it
        // through the handler's `extra` too: that stamps the request id, so
        // the notification rides THIS call's response stream and is
        // guaranteed to reach the caller before the tool result.
        await extra.sendNotification({ method: "notifications/tools/list_changed" });
        return { content: [{ type: "text" as const, text: "renamed" }] };
      },
    );
    return server;
  };

  return { factory, renameTool, initialToolName, renamedToolName };
};