🤖 🚆 Copilot on Rails

[Matthew Fisher (MicroFish91)]

Status

Feel free to start reviewing this if you haven't already. We do have a few open PRs to merge still linked below. There shouldn't be that many of them, but if you see some files that don't belong, it's probably because we haven't synced with main in a little while. For example I cherry-picked a couple PRs from main to be able to grab the mcp updates, which is why you may see some unrelated activity log mcp tooling showing up in the diff. I'll sync up a merge once we get more of the remaining PRs added in.

Overview

Copilot on Rails is a guided, end-to-end project creation flow for building an Azure-ready application without leaving
VS Code. A set of custom chat agents walks the user through three phases — planning & scaffolding the
project, setting up local development and debugging, and preparing deployment to Azure. The first two phases are handled by us, the last phase is handed off to the GitHub Copilot for Azure deployment skills.

The extension puts rails around that flow with embedded webviews for reviewing and approving each plan, MCP tools the agents call to hand control back to us, and a new Azure Project Explorer pane that tracks progress across the stages.

Table of Contents

This PR is large, so here's a guided map of the main areas of change. Reviewing the groups below should give the clearest picture of how Copilot on Rails is wired together.

#	Files	What's in it
1	resources/agents	Custom agents + their instructions and shared references
2	src/commands/copilotOnRails	Full list of Copilot on Rails commands, grouped by phase
3	src/chat/tools/copilotOnRails	MCP tools chat calls back into when phase work completes
4	src/tree/project	New azureProject Explorer pane that tracks stage progress
5	src/webviews/copilotOnRails/extension	Extension-side controller logic that the webviews message
6	src/webviews/copilotOnRails/views	The webviews themselves — React views, components, styles
7	src/utils/copilotOnRails	Wrappers that automatically record the bulk of telemetry and local diagnostics
8	test/testProjects/copilotOnRails	Fixtures captured from generated runs, used for testing

Data Flow Diagram

Coming soon...

Open PRs

We can always merge this separately as well if need be.

• Record autopilot telemetry automatically for all CoR commands #1613
• CoR: Improve prerequisites detection to be more shell agnostic #1558
• CoR: Add a way to report issue to GitHub with attached diagnostics info #1604 (still some open questions, like where to surface report issue buttons and what the report flow should look like)
• Add a warning for when the GHC4A extension/skills are not installed when trying to deploy #1614