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GitHub Copilot Customization Architecture

Instructions · Skills · Custom Agents · Hooks · SDK

Best Practices for Engineers ｜ Principal Engineer Perspective

February 2026

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Table of Contents

1. Architecture Overview — Five Core Components and Their Relationships

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Running Meld on MacOS

The state of Meld on Macs is currently in flux. TLDR: currently, the best way to run Meld is to install Homebrew and then run brew install dehesselle-meld.

More details on dehesselle-meld and alternative installation

The dehesselle-meld cask will

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### Test on https://github.com/yousseb/meld/releases/tag/osx-20
### OSX - 3.21.0 (r4) Sonoma
### !!! Note: You need put the Meld.app r4 build to the /Applications path first.

#!/bin/zsh

#Fix libpng16.16.dylib not found
install_name_tool -change /usr/local/opt/libpng/lib/libpng16.16.dylib @executable_path/../Frameworks/libpng16.16.dylib /Applications/Meld.app/Contents/Frameworks/libfreetype.6.20.0.dylib

#Fix libbrotlidec.1.dylib not found

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#!/usr/bin/env bash

brew install openssl

git clone git://anongit.mindrot.org/openssh.git
cd openssh

# ./configure script does not exist, so we have to build it
autoreconf

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#define UNW_LOCAL_ONLY
#include <libunwind.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <pthread.h>

void
backtrace(void)
{

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#!/usr/bin/awk -f

BEGIN {
	FS = ",";
}

function update_array(server_name, ticket)
{
	if (length(ticket) != 0)
	{

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#!/usr/bin/awk -f

BEGIN {
	FS = ",";
}

function update_array(server_name, ticket, full_array, partial_bytes_array)
{
	if (length(ticket) != 0)
	{

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#!/usr/bin/awk -f

BEGIN {
	FS = ",";
}

function update_array(ticket, full_array, partial_bytes_array)
{
	if (length(ticket) != 0)
	{

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#!/usr/bin/awk -f

BEGIN {
	FS = ",";
	session_id_ticket = 0
}

function update_array(len, array)
{
	if (len != 0)

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#!/usr/bin/awk -f

function max_value(new_value, old_value)
{
	if (new_value > old_value)
	{
		return new_value;
	}
	else
	{