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GitHub Copilot Complete Guide

A comprehensive guide series that systematically covers everything from instruction design to agent operations in GitHub Copilot. This includes hybrid operations with Claude Code for enterprise teams, as well as unified multi-tool management through Agent Skills and AGENTS.md.

🔀 Which Article Should You Read First?

graph TD
    Q1{"Have you set up<br>instruction files before?"}
    Q2{"Mixed technology<br>stacks?"}
    Q3{"Want to hand off procedures<br>for autonomous execution?"}
    Q3b{"Need deterministic control<br>over tool execution?"}
    Q4{"Using AI tools<br>other than Copilot?"}
    Q5{"Running out of<br>AI Credits or legacy<br>premium requests?"}

    A1["Custom Instructions<br>Complete Guide"]
    A2["applyTo<br>Pattern Guide"]
    A3["Agent Skills<br>Guide"]
    A3b["Hooks<br>Complete Guide"]
    A4["AGENTS.md<br>Unified Management Guide"]
    A5["Methodology<br>Guide"]
    A6["AI Credits<br>Optimization"]

    Q1 -- No --> A1
    Q1 -- Yes --> Q2
    Q2 -- Yes --> A2
    Q2 -- No --> Q3
    Q3 -- Yes --> A3
    Q3 -- No --> Q3b
    Q3b -- Yes --> A3b
    Q3b -- No --> Q4
    Q4 -- Yes --> A4
    Q4 -- No --> Q5
    Q5 -- Yes --> A6
    Q5 -- No --> A5

    style A1 fill:#e1f5fe,stroke:#0288d1
    style A2 fill:#e1f5fe,stroke:#0288d1
    style A3 fill:#e1f5fe,stroke:#0288d1
    style A4 fill:#e1f5fe,stroke:#0288d1
    style A5 fill:#e1f5fe,stroke:#0288d1
    style A6 fill:#fff3e0,stroke:#f57c00
Flow ResultOverview
Custom Instructions Complete GuideStart here for first-time setup
applyTo Pattern GuideSwitch instructions by file path
Agent Skills GuidePackage procedures for autonomous execution
Hooks Complete GuideDeterministic control over tool execution and audit logging
AGENTS.md Unified Management GuideManage shared rules across multiple AI tools
Methodology GuideCross-tool operational design
AI Credits OptimizationKeep usage-based billing under control

Guide by Use Case

Getting Started & Basics

What You Want to DoRecommended Article
Teach Copilot your project rulesCustom Instructions Complete Guide
Apply different rules per pathapplyTo Pattern Guide
Use common rules across multiple AI toolsAGENTS.md Unified Management Guide
Block dangerous operations or add audit loggingHooks Complete Guide
Check personal data training settingsGitHub Copilot Data Training Policy

Agent Utilization & Operations

What You Want to DoRecommended Article
Hand off procedures to an agent for autonomous executionAgent Skills Guide + Agent Mode
Combine Copilot with Claude CodeMulti-Agent Collaboration Guide + Methodology Guide
Start Copilot cloud agent from internal portals or batch jobsCopilot Cloud Agent REST API
Distribute Skills, Hooks, and MCP as enterprise standardsCopilot CLI Enterprise-Managed Plugins
Measure Copilot code review value with KPIsCopilot Code Review Metrics
Understand the AI Credits migration and budget impactGitHub Copilot AI Credits Billing
Optimize AI Credits usageGitHub Copilot AI Credits Optimization
Check Microsoft's in-house model performance and pricingMAI-Code-1-Flash Analysis
Separate billing boundaries for Skills, MCP, and external contextGitHub Copilot AI Credits Cost Design
Understand the downgrade criticism and lock-in riskGitHub Copilot AI Credits Lock-in Risk
Optimize legacy premium request spendingPremium Request Optimization + AI Credits Optimization

Instruction System

The system for conveying project knowledge to Copilot consists of four layers plus two extensions.

MechanismWhen AppliedTypical Use
copilot-instructions.mdAlways (all requests)Coding conventions, tech stack
.instructions.md + applyToWhen file path matches (automatic)Frontend/backend-specific rules
Agent SkillsWhen the agent determines it's neededTerraform review procedures, release procedures
AGENTS.mdAt agent startupProject-wide policies (shared across multi-tools)

For operational considerations, also refer to the Copilot Methodology Guide (criteria for adopting Skills / AGENTS.md, role division with Claude Code).

Agent Features

Copilot goes beyond code completion, functioning as an agent that autonomously executes tasks.

Past update records: Agent Mode & Claude Code (August 2025 Edition)

Agent Skills also function as procedural knowledge for autonomous agent execution. For details, see the Agent Skills card in the Instruction System section.

Current billing after June 2026

The plan table below reflects the premium-request model as of February 2026. For AI Credits savings under usage-based billing after June 1, 2026, see AI Credits Optimization.

Premium request consumption varies by model. The legacy plan request counts and included models are as follows.

Pricing Plans (as of February 2026) — Free (50/month) to Enterprise (1,000/user/month). Agent Mode available on all plans
PlanMonthly CostPremium RequestsIncluded Models (No Request Consumption)Primary Audience
Free$050GPT-4o, GPT-4.1Individuals & Students
Pro$10300GPT-4o, GPT-4.1, GPT-5 miniIndividual Developers
Pro+$391,500GPT-4o, GPT-4.1, GPT-5 miniHeavy Users
Business$19/user300/userGPT-4o, GPT-4.1, GPT-5 miniTeams
Enterprise$39/user1,000/userGPT-4o, GPT-4.1, GPT-5 miniLarge Organizations
  • Agent Mode is available on all plans
  • Premium requests are consumed when using high-performance models (Claude Opus 4.6, GPT-5.1, Gemini 3 Pro, etc.). Basic code completion is unlimited
  • Additional purchase: $0.04/request
  • For the latest pricing and model information, see GitHub Docs

Guides for tools and technologies commonly used alongside Copilot.