Vscode Extension Builder Lawvable

What it does

When your agent uses it

• User wants to create a VS Code extension
• Convert a web app to an extension
• Custom UIs to VS Code
• Implement tree views

Example prompts

• “/vscode-extension-builder-lawvable”

Requirements

• Node.js

Workflow steps

2 steps, taken from the first numbered list in SKILL.md.

1. 1Extension Host (Node.js) — Backend logic, file access, VS Code APIs
2. 2Webviews (browser sandbox) — Custom UIs with HTML/CSS/JS (React, Vue, vanilla)

What it can do on your machine

Read from SKILL.md and the folder at commit 045f738. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Ships script files (JavaScript and TypeScript, from the files we listed), which the agent can run.

  Shell commands in SKILL.md call:

  • npm

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  No URLs in SKILL.md. Its commands use npm, which can reach the network depending on how they are called.

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names no API keys, tokens, secrets or passwords.

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Vscode Extension Builder Lawvable loads about 1.9k tokens when it runs, and up to ~26k if it reads all its reference files. Until then it costs about 116 tokens; SKILL.md has 486 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~116

When it runs · the whole SKILL.md, loaded when a task matches

~1.9k

With references · SKILL.md plus every file in references/, read only if the agent opens them

~26k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from lawve-ai/awesome-legal-skills at commit 045f738, republished under its AGPL-3.0 licence (© lawve-ai). 486 words, ~1,918 tokens.

name

vscode-extension-builder-lawvable

description

Build VS Code extensions from scratch or convert existing JS/React/Vue apps. Supports commands, webviews (React/Vue), custom editors, tree views, and AI agent integration via file-bridge IPC. Use when user wants to create a VS Code extension, convert a web app to an extension, add webviews or custom UIs to VS Code, implement tree views, build custom file editors, integrate with AI agents, or package/publish extensions (.vsix).

metadata.author

Antoine Louis (Lawvable)

metadata.license

AGPL-3.0

metadata.version

2026.02.04

vscode.commands.registerCommand('myExt.doSomething', () => {
  vscode.window.showInformationMessage('Done!');
});

const panel = vscode.window.createWebviewPanel(
  'myView', 'My Panel', vscode.ViewColumn.One,
  { enableScripts: true }
);
panel.webview.html = getWebviewContent();

vscode.window.registerTreeDataProvider('myTreeView', new MyTreeProvider());

vscode.window.registerCustomEditorProvider('myExt.myEditor', new MyEditorProvider());

// esbuild.js
esbuild.build({
  entryPoints: ['src/extension.ts'],
  bundle: true,
  outfile: 'dist/extension.js',
  external: ['vscode'],
  format: 'cjs',
  platform: 'node',
});

// vite.config.ts
export default defineConfig({
  build: {
    outDir: '../dist/webview',
    rollupOptions: { output: { entryFileNames: '[name].js' } }
  }
});

{
  "name": "my-extension",
  "displayName": "My Extension",
  "publisher": "your-publisher-id",
  "version": "0.0.1",
  "engines": { "vscode": "^1.85.0" },
  "main": "./dist/extension.js",
  "activationEvents": [],
  "contributes": {
    "commands": [{ "command": "myExt.hello", "title": "Hello" }]
  }
}

// Extension → Webview
panel.webview.postMessage({ type: 'update', data: {...} });

// Webview → Extension
panel.webview.onDidReceiveMessage(msg => {
  if (msg.type === 'save') { /* handle */ }
});

// Watch for command files
fs.watch(commandDir, (event, filename) => {
  if (filename.endsWith('.json')) {
    const command = JSON.parse(fs.readFileSync(path.join(commandDir, filename)));
    processCommand(command);
  }
});

npm install -g @vscode/vsce
vsce package

.vscode/**
node_modules/**
src/**
*.ts
tsconfig.json
esbuild.js
vite.config.ts

vsce package --target win32-x64
vsce package --target darwin-arm64
vsce package --target linux-x64

© lawve-ai, AGPL-3.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 46 other files (references, assets) in skills/vs-code-extension-antoine-louis of lawve-ai/awesome-legal-skills.

• SKILL.md
• LICENSE.txt
• README.md
• assets/basic-command/esbuild.js
• assets/basic-command/package.json
• assets/basic-command/src/extension.ts
• assets/basic-command/tsconfig.json
• assets/custom-editor/esbuild.js
• assets/custom-editor/package.json
• assets/custom-editor/src/editorProvider.ts
• assets/custom-editor/src/extension.ts
• assets/custom-editor/tsconfig.json
• assets/file-bridge/esbuild.js
• assets/file-bridge/package.json
• assets/file-bridge/src
• … and 32 more

Open the folder on GitHubat commit 045f738