Cursor Extension Integration

---
name: "cursor-extension-integration"
description: |
  Integrate VS Code extensions with Cursor IDE: compatibility, Open VSX registry, VSIX installation,
  conflict resolution, and essential extensions. Triggers on "cursor extensions", "cursor vscode extensions",
  "cursor plugins", "cursor marketplace", "open vsx", "vsix install".
allowed-tools: "Read, Write, Edit, Bash(cmd:*)"
version: 1.0.0
license: MIT
author: "Jeremy Longshore <jeremy@intentsolutions.io>"
compatible-with: claude-code, codex, openclaw
tags: [saas, cursor, cursor-extension]

---
# Cursor Extension Integration

Integrate VS Code extensions with Cursor IDE. Covers the Open VSX Registry, VSIX installation for Microsoft-exclusive extensions, conflict resolution with AI features, and recommended extension stacks.

## Extension Marketplace: Key Difference from VS Code

Cursor uses the **Open VSX Registry** instead of Microsoft's VS Code Marketplace. This is because Microsoft's marketplace terms restrict access to VS Code products only.

**Impact:** Most popular extensions are on Open VSX. Some Microsoft-published extensions are not.

### Available on Open VSX (works directly)

| Extension | Category |
|-----------|----------|
| ESLint | Linting |
| Prettier | Formatting |
| GitLens | Git visualization |
| Docker | Container management |
| Python | Python language support |
| Pylance | Python analysis (community build) |
| Go | Go language support |
| Rust Analyzer | Rust language support |
| Tailwind CSS IntelliSense | CSS utilities |
| Auto Rename Tag | HTML/JSX editing |
| Error Lens | Inline error display |
| TODO Highlight | Comment highlighting |
| Thunder Client | API testing |

### NOT Available on Open VSX (need manual install)

| Extension | Reason | Workaround |
|-----------|--------|------------|
| GitHub Copilot | Microsoft exclusive | Use Cursor's built-in AI (better integration) |
| Live Share | Microsoft exclusive | Use other collaboration tools |
| Remote - SSH | Microsoft exclusive | Install via VSIX |
| C# Dev Kit | Microsoft exclusive | Install via VSIX |
| IntelliCode | Microsoft exclusive | Cursor's Tab replaces this |

## Installing Extensions

### From Open VSX (In-App)

```
Cmd+Shift+X → search extension name → Install
```

### From VSIX (Manual)

For extensions not on Open VSX:

1. Go to the VS Code Marketplace website: [marketplace.visualstudio.com](https://marketplace.visualstudio.com)
2. Find the extension page
3. Click "Download Extension" (downloads `.vsix` file)
4. In Cursor: `Cmd+Shift+P` > `Extensions: Install from VSIX...`
5. Select the downloaded `.vsix` file

### From Command Line

```bash
# Install from Open VSX
cursor --install-extension dbaeumer.vscode-eslint

# Install from VSIX file
cursor --install-extension ~/Downloads/extension.vsix

# List installed extensions
cursor --list-extensions

# Uninstall
cursor --uninstall-extension dbaeumer.vscode-eslint
```

## Conflict Resolution with Cursor AI

### Extensions That Conflict with Cursor

| Extension | Conflict | Resolution |
|-----------|----------|------------|
| **GitHub Copilot** | Duplicate Tab/ghost text suggestions | Disable Copilot. Cursor's built-in AI is better integrated |
| **TabNine** | Duplicate inline completions | Disable TabNine |
| **Codeium** | Duplicate inline completions | Disable Codeium |
| **IntelliCode** | Duplicate completions | Disable IntelliCode |
| **Vim** | Ctrl+K/L/I keybinding conflicts | Remap AI shortcuts (see below) |

### Vim Extension Conflict Resolution

```json
// keybindings.json
[
  {
    "key": "ctrl+l",
    "command": "aichat.focus",
    "when": "!vim.active || vim.mode == 'Normal'"
  },
  {
    "key": "ctrl+k",
    "command": "cursor.edit",
    "when": "editorTextFocus && vim.mode == 'Normal'"
  },
  {
    "key": "ctrl+i",
    "command": "composer.open",
    "when": "!vim.active || vim.mode == 'Normal'"
  }
]
```

### General Keybinding Conflict Check

`Cmd+K Cmd+S` > search for the conflicting shortcut > see which commands are bound > reassign or disable.

## Recommended Extension Stacks

### JavaScript / TypeScript

```
Required:
  dbaeumer.vscode-eslint          # Linting
  esbenp.prettier-vscode          # Formatting
  bradlc.vscode-tailwindcss       # Tailwind CSS (if using)

Recommended:
  formulahendry.auto-rename-tag   # HTML/JSX tag renaming
  usernamehw.errorlens            # Inline error display
  wix.vscode-import-cost          # Import size display
  christian-kohler.path-intellisense  # Path autocomplete
```

### Python

```
Required:
  ms-python.python                # Python language support
  charliermarsh.ruff              # Fast Python linter

Recommended:
  ms-python.debugpy               # Python debugger
  njpwerner.autodocstring         # Docstring generator
  ms-toolsai.jupyter              # Jupyter notebook support
```

### Go / Rust

```
Go:
  golang.go                       # Official Go extension

Rust:
  rust-lang.rust-analyzer         # Rust language server
  tamasfe.even-better-toml        # TOML config files
```

### DevOps

```
  ms-azuretools.vscode-docker     # Docker support
  redhat.vscode-yaml              # YAML validation
  hashicorp.terraform             # Terraform HCL support
  ms-kubernetes-tools.vscode-kubernetes-tools  # Kubernetes
```

## Performance Impact

Extensions affect editor performance. Audit regularly:

### Measuring Extension Impact

1. `Cmd+Shift+P` > `Developer: Show Running Extensions`
2. Sort by activation time or profile time
3. Disable extensions with high activation times that you rarely use

### Common Performance Offenders

| Extension | Issue | Fix |
|-----------|-------|-----|
| GitLens | High CPU on large repos | Disable for repos > 100K commits |
| Prettier (on save) | Slow on large files | Configure file size limit |
| TypeScript | High memory on large projects | Increase `tsserver.maxTsServerMemory` |
| Spell checker | CPU on large files | Exclude generated files |

### Disabling Extensions Per Workspace

```json
// .vscode/settings.json (per project)
{
  "extensions.ignoreRecommendations": true
}
```

Or right-click an extension > `Disable (Workspace)` to disable only for the current project.

## Extension Settings Sync

Cursor does not sync extensions between machines automatically like VS Code Settings Sync. To transfer:

```bash
# Export extension list
cursor --list-extensions > cursor-extensions.txt

# On new machine, reinstall all
while read ext; do cursor --install-extension "$ext"; done < cursor-extensions.txt
```

## Enterprise Considerations

- **Extension allow/deny lists**: No built-in mechanism in Cursor. Enforce via documentation and team policy.
- **VSIX vetting**: Review VSIX files before distributing to team (check for telemetry, network calls)
- **Open VSX vs Marketplace**: Some extensions have different publishers on Open VSX. Verify publisher identity.
- **Extension updates**: Extensions auto-update from Open VSX. VSIX-installed extensions do NOT auto-update.

## Resources

- [Cursor Extensions Documentation](https://docs.cursor.com/configuration/extensions)
- [Open VSX Registry](https://open-vsx.org)
- [VS Code Marketplace](https://marketplace.visualstudio.com) (for VSIX downloads)