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GitHub Copilot CLI

GitHub Copilot CLI is GitHub's terminal coding agent. GA since February 2026, validated as a Dev Container feature.

Setup​

[ai.harness.copilot]
enabled = true
install = true

Run aibox apply, then inside the container:

copilot /login   # Authenticate on first launch
copilot          # Launches GitHub Copilot CLI

Requirements​

A GitHub Copilot subscription (Individual, Business, or Enterprise) is required.

Configuration​

Copilot's configuration is persisted in .aibox-home/.copilot/, mounted at /home/aibox/.copilot/.

Key files:

  • .copilot/config.json — Copilot settings (overridable via COPILOT_HOME)

MCP Integration​

GitHub Copilot CLI reads .mcp.json (the Claude Code MCP format). aibox generates .mcp.json automatically on aibox apply, merging processkit built-in servers, team servers from aibox.toml [ai.mcp], and personal servers from .aibox-local.toml [mcp].

.mcp.json is gitignored — it is regenerated on every aibox apply and must not be committed.

To add MCP servers:

# aibox.toml — team-shared servers
[[mcp.servers]]
name    = "github"
command = "npx"
args    = ["-y", "@modelcontextprotocol/server-github"]

# .aibox-local.toml — personal servers
[[mcp.servers]]
name    = "my-internal-tool"
command = "npx"
args    = ["-y", "@acme/internal-mcp-server"]

Installation​

GitHub Copilot CLI is installed via npm (npm install -g @github/copilot).