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Setting Up Xcode Claude Code with Third-Party API Endpoints

This guide explains how to configure Xcode's built-in Claude Code integration to work with third-party API endpoints instead of the official Anthropic API. You need macOS 26.2+ and Xcode 26.3+ for the Claude Code integration.

Step 1: Install Claude Code component in Xcode

You need to first install Xcode's own Claude Code instance, with its own Claude Code binary.

Xcode Settings -> Intelligence -> Anthropic -> Claude Agent -> press Get button

This was a huge hassle to figure out, so I wrote up a little guide in hopes that others would find it helpful:

How to convince macOS to do IPv6 DNS lookups when your only IPv6 address is via a VPN or tunnel of some sort

The Problem

macOS's domain name resolver will only return IPv6 addresses (from AAAA records) when it thinks that you have a valid routable IPv6 address. For physical interfaces like Ethernet or Wi-Fi it's enough to set or be assigned an IPv6 address, but for tunnels (such as those using utun interfaces) there are some extra annoying steps that need to be taken to convince the system that yes, you indeed have an IPv6 address, and yes, you'd like to get IPv6 addresses back for DNS lookups.

I use wg-quick to establish a WireGuard tunnel between my laptop and a Linode virtual server. WireGuard uses a utun user-space tunnel device to make the connection. Here's how that device gets configured:

Here's a list of mildly interesting things about the C language that I learned mostly by consuming Clang's ASTs. Although surprises are getting sparser, I might continue to update this document over time.

There are many more mildly interesting features of C++, but the language is literally known for being weird, whereas C is usually considered smaller and simpler, so this is (almost) only about C.

1. Combined type and variable/field declaration, inside a struct scope [https://godbolt.org/g/Rh94Go]

struct foo {
   struct bar {
 int x;

AWS Glacier: Delete vault

Follow these steps to remove all archives from an AWS vault. After this is finished, you will be able to delete the vault itself through the browser console.

Step 1 / Retrieve inventory

This will create a job that collects required information about the vault.

$ aws glacier initiate-job --job-parameters '{"Type": "inventory-retrieval"}' --account-id YOUR_ACCOUNT_ID --region YOUR_REGION --vault-name YOUR_VAULT_NAME

Using a Mikrotik router to boot and install Windows

Lately I've been using Mikrotik routers because they're cheap, powerful, and fast. Most of them have either a USB or MicroSD slot, so you can add enough space to store network boot images right on the router.

I got most of the tips needed from these two articles, and combined them into this step by step guide:

	"""
	The most atomic way to train and run inference for a GPT in pure, dependency-free Python.
	This file is the complete algorithm.
	Everything else is just efficiency.

	@karpathy
	"""

	import os # os.path.exists
	import math # math.log, math.exp

	customization:
	distribution_code_name: Weasel
	distribution_version: 0.15.0.0
	generator: "Weasel::UIStyleSettings"
	modified_time: "Sun Jan 7 19:02:10 2024"
	rime_version: 1.8.5
	patch:
	app_options:
	code.exe:
	ascii_mode: true

	<?xml version="1.0" encoding="utf-8"?>
	<unattend xmlns="urn:schemas-microsoft-com:unattend">
	<servicing></servicing>
	<settings pass="windowsPE">
	<component name="Microsoft-Windows-Setup" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="nonSxS" xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
	<DiskConfiguration>
	<WillShowUI>OnError</WillShowUI>
	<Disk wcm:action="add">
	<CreatePartitions>
	<CreatePartition wcm:action="add">

	Copyright 2020 Aubrey Taylor

	Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

	The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTH

	#include <windows.h>
	#include <string>

	using namespace std::string_literals;

	constexpr size_t buffer_size = 64*1024;
	static char buffer[buffer_size];

	static DWORD PrintString(HANDLE h_stdout, std::wstring const& string) {
	DWORD count;