AI/ML

How to build GitHub Copilot

AI pair programmer with code completions, chat, CLI assistance, and multi-file editing in IDEs.

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Features (10)

Inline code completions

Chat with codebase context

Multi-file editing

CLI completions

PR description generation

Code review suggestions

Custom instructions

Workspace agent

Extensions API

Enterprise controls

User Stories (5)

As a developer, I can get AI suggestions as I type

As a developer, I can ask Copilot to explain or refactor code

As a reviewer, I can get AI-generated PR summaries

As a team lead, I can set custom coding guidelines

As an enterprise, I can control which repos Copilot accesses

Suggested Tech Stack

PythonTypeScriptRustOpenAI CodexTree-sitterLSPVS Code APIGitHub APIAzure

Non-Functional Requirements

Category	Requirement	Target
Performance	Suggestion latency	< 300ms for inline completions
Performance	Context	Index full repo for relevant suggestions
Availability	Service	99.9% — developers rely on it during active coding
Security	Code	No code retention, IP indemnity for business, telemetry controls

Release Milestones

MVPCode Completions

Inline suggestionsTab to acceptMulti-lineVS Code extension

v1.0Chat & Context

Copilot ChatCodebase contextPR descriptionsJetBrains/Neovim support

v2.0Agent

Multi-file editingWorkspace agentCLI (gh copilot)Extensions APICustom instructions

Success Metrics

Suggestion acceptance rate: > 30%

Active subscribers: > 1M paid

Code written with Copilot: > 40% of committed lines

Enterprise adoption: > 50K organizations

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