Running vscode.dev Against Local VS Code Sources

The vscode-dev repo is the vscode.dev server. When run locally with ?vscode-quality=dev, it serves the VS Code web workbench (or Agents window at /agents) from the sibling microsoft/vscode checkout. This is the fastest way to validate web-only changes to the workbench without shipping an Insiders build.

Layout assumption

vscode-dev and vscode must be sibling folders:

<workRoot>/
  vscode/          # microsoft/vscode checkout
  vscode-dev/      # microsoft/vscode-dev checkout

If your paths differ, check server/ in vscode-dev for the source root resolution — the /vscode-sources/* route maps to ../vscode.

Start the dev server

Critical: Run npm run dev from the vscode-dev folder, NOT from vscode. The vscode repo has no dev script and will fail with npm error Missing script: "dev". Terminal tools that simplify/strip leading cd into separate commands will silently keep the cwd of a previous terminal — always use an absolute pushd or verify with pwd before npm run dev.