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+# VS Code extensions
+
+This article will show you the ways to add VS Code extensions and use them with
+a Coder workspace:
+
+1. Using the
+   [public extensions marketplaces](vscode-extensions.md#using-the-public-extensions-marketplaces)
+   with Code Web (code-server)
+1. Adding
+   [extensions to custom images](vscode-extensions.md#adding-extensions-to-custom-images)
+1. Installing extensions
+   [using its `vsix` file at the command line](vscode-extensions.md#installing-extensions-using-its-vsix-file-at-the-command-line)
+1. Installing extensions
+   [from a marketplace using the command line](vscode-extensions.md#installing-from-a-marketplace-at-the-command-line)
+1. Using a
+   [local VS Code instance with SSH](vscode-extensions.md#using-a-local-vs-code-instance-with-ssh)
+
+## Using the public extensions marketplaces
+
+You can manually add an extension while you're working in the Code Web IDE. The
+extensions can be from Coder's public marketplace, Eclipse Open VSX's public
+marketplace, or the Eclipse Open VSX _local_ marketplace.
+
+![Code Web Extensions](../images/ides/code-web-extensions.png)
+
+> Note: Microsoft does not allow any unofficial VS Code IDE to connect to the
+> extension marketplace.
+
+## Adding extensions to custom images
+
+You can add extensions to a custom image and install them either through Code
+Web or using the workspace's terminal.
+
+1. Download the extension(s) from the Microsoft public marketplace.
+
+   ![Code Web Extensions](../images/ides/copilot.png)
+
+1. Add the `vsix` extension files to the same folder as your Dockerfile.
+
+   ```shell
+   ~/images/base
+    ➜  ls -l
+    -rw-r--r-- 1 coder coder       0 Aug 1 19:23 Dockerfile
+    -rw-r--r-- 1 coder coder 8925314 Aug 1 19:40 GitHub.copilot.vsix
+   ```
+
+1. In the Dockerfile, add instructions to make a folder and to copy the `vsix`
+   files into the newly created folder.
+
+   ```Dockerfile
+   FROM codercom/enterprise-base:ubuntu
+
+   # Run below commands as root user
+   USER root
+
+   # Download and install VS Code extensions into the container
+   RUN mkdir -p /vsix
+   ADD ./GitHub.copilot.vsix /vsix
+
+   USER coder
+   ```
+
+1. Build the custom image, and push it to your image registry.
+
+1. Pass in the image and below command into your template `startup_script` (be
+   sure to update the filename below):
+
+   **Startup Script**
+
+   ```hcl
+   resource "coder_agent" "main" {
+     ...
+     startup_script = "code-server --install-extension /vsix/Github.copilot.vsix"
+   }
+   ```
+
+   **Image Definition**
+
+   ```hcl
+   resource "kubernetes_deployment" "main" {
+     spec {
+       template {
+         spec {
+           container {
+             name   = "dev"
+             image  = "registry.internal/image-name:tag"
+           }
+         }
+       }
+     }
+   }
+   ```
+
+1. Create a workspace using the template.
+
+You will now have access to the extension in your workspace.
+
+## Installing extensions using its `vsix` file at the command line
+
+Using the workspace's terminal or the terminal available inside `code-server`,
+you can install an extension whose files you've downloaded from a marketplace:
+
+```console
+/path/to/code-server --install-extension /vsix/Github.copilot.vsix
+```
+
+## Installing from a marketplace at the command line
+
+Using the workspace's terminal or the terminal available inside Code Web (code
+server), run the following to install an extension (be sure to update the
+snippets with the name of the extension you want to install):
+
+```console
+SERVICE_URL=https://extensions.coder.com/api ITEM_URL=https://extensions.coder.com/item /path/to/code-server --install-extension GitHub.copilot
+```
+
+Alternatively, you can install an extension from Open VSX's public marketplace:
+
+```console
+SERVICE_URL=https://open-vsx.org/vscode/gallery ITEM_URL=https://open-vsx.org/vscode/item /path/to/code-server --install-extension GitHub.copilot
+```
+
+## Using VS Code Desktop
+
+For your local VS Code to pickup extension files in your Coder workspace,
+include this command in your `startup_script`, or run in manually in your
+workspace terminal:
+
+```console
+code --extensions-dir ~/.vscode-server/extensions --install-extension "$extension"
+```
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