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Cursor + GPT models: Provider Error caused by overly-complex MCP tool JSON schemas (OpenAI nesting depth limit)

Cursor "Provider Error" with GPT models: MCP tool schema nesting depth

Summary

When using Cursor with MCP (Model Context Protocol) servers, GPT models (gpt-5.3-codex-, gpt-5.2-codex-, etc.) return a generic "Provider Error" that gives no actionable information:

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SCP Files to/from Kernel Browser VMs

The Kernel CLI's kernel browsers ssh command (kernel/cli#103) provisions an SSH server on a browser VM and tunnels the connection over WebSockets. Because it sets up a standard OpenSSH server, you can use scp (and rsync, sftp, etc.) with the same tunnel — not just interactive shells.

Prerequisites

1. Kernel CLI v0.14.5+ (with the browsers ssh subcommand and -o json support)

2. websocat — WebSocket-to-TCP bridge used as the SSH ProxyCommand

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name	description	allowed-tools
doordash	Access DoorDash for food delivery ordering, order history, account management, and restaurant/store browsing.	Bash(agent-browser:*)

DoorDash.com

Uses agent-browser with Kernel cloud browser provider. See the kernel-agent-browser skill for best practices.

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#!/bin/bash
#
# Viewport Debug Script for Kernel Browsers
#
# This script demonstrates the difference between:
# 1. Creating a browser WITH viewport set at creation time
# 2. Creating a browser WITHOUT viewport (uses default 1920x1080)
#
# Usage: ./viewport-debug.sh
#

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#!/bin/bash
#
# Kernel Provider Integration Test
# Tests agent-browser CLI with Kernel cloud browser provider
#
# Usage:
#   KERNEL_API_KEY="your-api-key" ./test-kernel-provider.sh
#
# Requirements:
#   - agent-browser built (npm run build && npm run build:native)

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#!/usr/bin/env bash

set -e

cd /tmp
rm -rf /tmp/mock
mkdir /tmp/mock
cd /tmp/mock

git clone https://github.com/golang/mock mock-before

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package main

import (
	"fmt"
	"log"

	"gopkg.in/yaml.v2"
)

const withAlias = `foo:

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github.com/eapache/go-resiliency/breaker

func New(errorThreshold, successThreshold int, timeout time.Duration) *Breaker

New constructs a new circuit-breaker that starts closed. From closed, the breaker opens if "errorThreshold" errors are seen without an error-free period of at least "timeout". From open, the breaker half-closes after "timeout". From half-open, the breaker closes after "successThreshold" consecutive successes, or opens on a single error.

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package main

import (
	"context"
	"fmt"
	"log"
	"net/http"
	"time"

	"golang.org/x/net/context/ctxhttp"

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*** 171,176 ****
--- 171,177 ----
  
      req.on('error', onConnectionClosed);
      req.setNoDelay(true);
+     req.setSocketKeepAlive(true);
      req.end();
    }