feat(openai): support for MCP connector tool

[christian-bromann]

This PR adds support for OpenAI's MCP (Model Context Protocol) tool, enabling models to connect to remote MCP servers and OpenAI-maintained service connectors.

Usage

import { ChatOpenAI, tools } from "@langchain/openai";

const model = new ChatOpenAI({ model: "gpt-4o" });

// Remote MCP server
const response = await model.invoke("Roll 2d4+1", {
  tools: [tools.mcp({
    serverLabel: "dmcp",
    serverUrl: "https://dmcp-server.deno.dev/sse",
    requireApproval: "never",
  })],
});

// Service connector (e.g., Google Calendar)
const calendarResponse = await model.invoke("What's on my calendar today?", {
  tools: [tools.mcp({
    serverLabel: "google_calendar",
    connectorId: "connector_googlecalendar",
    authorization: "<oauth-access-token>",
    requireApproval: "never",
  })],
});

Note: we don't have great support for the MCP approval flow. I left this out of this PR but filled an issue for it #9553

[changeset-bot]

🦋 Changeset detected

Latest commit: 5bc2c23

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 5 packages

Name	Type
@langchain/openai	Minor
@langchain/classic	Patch
@langchain/community	Patch
@langchain/deepseek	Patch
@langchain/xai	Patch

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