1. Conduid
  2. Commerce
  3. Leftglove
MCP server · Commerce

Leftglove

· github.com/stephenchilcote-gauntlet/leftglove

MCP server wrapping ShiftLefter — agent and human interface for exploration, cataloging, and testing web applications

Unclaimed commerce
InstallView source
34Low

Scored 4 months ago · breakdown

About Leftglove

Leftglove is an MCP server in the Commerce category: mCP server wrapping ShiftLefter — agent and human interface for exploration, cataloging, and testing web applications. It has been installed 0 times through Conduid.

Install

Clone
git clone https://github.com/stephenchilcote-gauntlet/leftglove

This server has no ConduID identity, so agent calls to it are not receipted. Pin the version you install and review the source before granting it credentials.

Ask AI

✦

Ask AI about Leftglove

Powered by Claude · Grounded in docs

I know everything about Leftglove. Ask me about installation, configuration, usage, or troubleshooting.

Security checks

  • ·README presentNot checked yet.
  • ·License declaredNot checked yet.
  • ·Tests presentNot checked yet.
  • ·Dependencies pinnedNot checked yet.
  • ·No dynamic code executionNot checked yet.
  • ·Scoped permissionsNot checked yet.

README

LeftGlove

Make any website usable by AI agents.

Point an LLM at a web page and it sees 10,000 DOM nodes — nested divs, ARIA wrappers, SVG icons, tracking pixels. It burns tokens parsing noise, hallucinates selectors, and clicks the wrong thing. LeftGlove fixes this.

LeftGlove is an MCP server that gives your agent a structured, validated view of any web page — only the elements that matter, with stable locators and human-readable labels. 90% of the DOM noise disappears. What's left is a clean inventory your agent can actually act on.

Agent: "What can I do on this page?"

LeftGlove (observe tool):
  clickable:
    - "Search" button          [data-testid=search-btn]
    - "Add to Cart"            [data-testid=add-cart]
    - "Next Page" link         [data-testid=pagination-next]
  typable:
    - "Search products" input  [data-testid=search-input]
    - "Zip code" input         [data-testid=zip-field]
  readable:
    - "$29.99"                 [data-testid=price]
    - "In Stock"               [data-testid=availability]

No more guessing. No more document.querySelector roulette.

LeftGlove demo

How It Works

Sieve — A deterministic function injected into the browser page. It walks the DOM, filters structural noise, and returns a typed inventory of every interactive and readable element with its locator, label, bounding box, and element type. Zero LLM calls, zero tokens, pure static analysis.

Toddler Loop — A web UI where a human reviews what the sieve found and classifies elements: what matters, what's chrome, what to skip. The output is a glossary that maps intent to concrete page elements. Optional auto-classify via Claude Haiku for bulk labeling.

MCP Server — Exposes the sieve and glossary as tools over the Model Context Protocol. Any MCP client — Claude Desktop, Claude Code, OpenClaw, your own agent — calls observe and gets back structured page state instead of raw HTML.

Quick Start

npx leftglove

That's it. Playwright downloads a bundled Chromium on first run. No Docker, no JVM, no external dependencies.

Claude Desktop / Claude Code

Add to your MCP config:

{
  "mcpServers": {
    "leftglove": {
      "command": "npx",
      "args": ["leftglove"]
    }
  }
}

From source

git clone https://github.com/stephenchilcote-gauntlet/leftglove.git
cd leftglove/leftglove/mcp-server
npm install && npm run build
node dist/index.js

Environment variables

Variable Default Description
SIEVE_URL (auto-start) URL of an external sieve server. If unset, LeftGlove starts its own Playwright browser.
SIEVE_PORT 3333 Port for the built-in sieve server.
SIEVE_HEADLESS true Set to false to see the browser window.

MCP Tools

Tool Description
observe Run the sieve on the current page. Returns a structured inventory of interactive elements — clickable, typable, readable — with locators and labels.
click Click an element by its index from the last observe result.
fill Fill a text input by its index from the last observe result.
navigate Navigate the browser to a URL.
screenshot Take a screenshot of the current page (base64 PNG).
list_vocabulary List the glossary: intent regions, elements, applicable verbs, and testid locators.
refresh_vocabulary Reload glossary files from disk after edits.

Why Not Just Feed the HTML to the LLM?

Raw HTML LeftGlove
Tokens 50k-200k per page 500-2k
Accuracy LLM guesses selectors Validated locators
Cost $0.10-0.50 per page view ~$0.005
Reliability Hallucinated clicks Deterministic inventory

Repository Layout

Path What
leftglove/mcp-server/ TypeScript MCP server (stdio transport)
leftglove/toddler/ Toddler loop UI — Node.js web app for human classification
leftglove/demo-app/ Demo web app for testing and development
bin/ demo-run — starts all services; demo-test — runs e2e tests

Tech Stack

  • MCP Server: TypeScript, @modelcontextprotocol/sdk, Zod
  • Sieve: Vanilla JavaScript, runs in-browser via Playwright
  • Toddler UI: Node.js, vanilla JS/HTML/CSS
  • Testing: Playwright, fast-check (property-based testing)

Status

Pre-release. The sieve, toddler loop, and MCP server work end-to-end. We're actively building toward a packaged release.

License

MIT

README mirrored from the source repository 4 months ago. The original is authoritative.

Questions

About Leftglove

How do I install Leftglove?

Run git clone https://github.com/stephenchilcote-gauntlet/leftglove, then add the server to your MCP client's configuration. Conduid has recorded 0 installs, so the command is known to work with current clients.

Is Leftglove safe to use with an AI agent?

Its trust score is 34 out of 100 (low). Conduid hasn't run static security checks on this repository yet, so review the source yourself before granting it credentials. It has no ConduID identity yet, so agent calls to it are not receipted.

Is Leftglove still maintained?

Conduid hasn't recorded a commit date for this repository yet. Check the repository directly for recent activity.