GPT-5 MCP Server

#!/usr/bin/env node import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js"; import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js"; import OpenAI from "openai"; import { z } from "zod"; import { config } from "./config.js"; import { runQuery } from "./openai.js"; import type { QueryInput } from "./openai.js"; // Initialize MCP server const server = new McpServer({ name: "gpt5-mcp", version: "0.1.0" }); // Initialize OpenAI client const openai = new OpenAI({ apiKey: config.apiKey, maxRetries: config.maxRetries, timeout: config.timeoutMs, }); // Input schema for the gpt5.query tool const QueryInputSchema = z.object({ query: z.string().describe("User question or instruction"), // Per-call overrides model: z.string().optional().describe("Model name, e.g. gpt-5"), system: z.string().optional().describe("Optional system prompt/instructions for the model"), reasoning_effort: z.enum(["low", "minimal", "medium", "high"]).optional(), verbosity: z.enum(["low", "medium", "high"]).optional(), tool_choice: z.enum(["auto", "none"]).optional(), parallel_tool_calls: z.boolean().optional(), max_output_tokens: z.number().int().positive().optional(), web_search: z .object({ enabled: z.boolean().optional(), search_context_size: z.enum(["low", "medium", "high"]).optional(), }) .optional(), }); server.tool( "gpt5_query", "Query GPT-5 with optional Web Search Preview. Supports verbosity and reasoning effort.", { input: QueryInputSchema }, async ({ input }) => { const parsed = QueryInputSchema.parse(input); try { const text = await runQuery(openai, parsed as QueryInput, config); return { content: [{ type: "text" as const, text: text || "No response text available." }], }; } catch (error) { console.error("Error calling OpenAI API:", error); const message = error instanceof Error ? error.message : "Unknown error"; return { content: [{ type: "text" as const, text: `Error: ${message}` }], isError: true, }; } } ); async function main() { if (!config.apiKey) { console.error("OPENAI_API_KEY is not set. Please set it in your environment or .env file."); } const transport = new StdioServerTransport(); await server.connect(transport); } main().catch((err) => { console.error("Fatal error in main():", err); process.exit(1); });