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Postman for WebMCP: inspect, test, and run WebMCP tools. Built-in AI agent, flow designer, and Jira/GitHub Remote MCP. TAMASH — WebMCP Tester Postman for WebMCP: inspect, test, and orchestrate WebMCP tools exposed by web applications — all from a Chrome side panel. WebMCP is Chrome's emerging API that lets web apps declare named, callable tools for AI agents (via document.modelContext.registerTool). TAMASH is the first dedicated testing and automation tool built around it. ────────────────────────────── WHAT IS WEBMCP? ────────────────────────────── WebMCP lets a web application declare its own tools — like add_item_to_cart, user_login, or place_order — that AI agents and automated flows can call directly. Instead of fragile CSS selectors or DOM scraping, the app exposes a stable, semantic API that survives UI redesigns. TAMASH requires Chrome 146 or later with Experimental Web Platform features enabled (chrome://flags/#enable-experimental-web-platform-features). ────────────────────────────── FOUR TABS — ONE SIDE PANEL ────────────────────────────── 🔧 TOOL TESTER Browse every WebMCP tool the current page has registered. Click a tool, fill in parameters, click Run, and see the exact result. No AI needed. Ideal for developers building and validating WebMCP tools before connecting to an agent. 🤖 AGENT Describe a goal in plain English and let the built-in AI agent drive the page using its WebMCP tools — turn by turn, up to 25 turns. Supports OpenAI, Anthropic (Claude), Google Gemini, and Ollama (cloud or local). No external server required — the agent runs entirely inside the extension. 🔀 FLOW Design reusable sequences of WebMCP tool calls that replay on demand — no AI prompt needed at run time. Create flows manually, or click "Save as Flow" after any successful agent run to capture every tool call automatically. Import and export flows as plain JSON to share with your team. Drag steps to reorder, edit parameters inline, and run with a single click. ⚙ SETTINGS Configure your AI provider, select a model, and save your API key. Also where you connect Remote MCP servers — add Jira or GitHub so their tools appear in the agent alongside your page's WebMCP tools. ────────────────────────────── TRY IT WITH VEGCART ────────────────────────────── VegCart is a purpose-built WebMCP demo app — a fresh produce e-commerce store with 16 registered WebMCP tools covering products, cart, checkout, wishlist, user accounts, and order history. Open https://vibetestq.com/testweb/vegcart/ in Chrome, click the TAMASH icon, and the Tool Tester immediately shows all 16 tools. Switch to the Agent tab and type: "Login as priya@example.com / test123, add Alphonso Mango ×2 and Spinach ×3, place an order to Bengaluru 560001, then show me the order history" Watch the agent execute every step — login, clear cart, add items, checkout, verify — in one run. 12 pre-built VegCart flows are available to download and import at: https://vibetestq.com/tamash/help#vegcart-flows ────────────────────────────── AI PROVIDERS SUPPORTED ────────────────────────────── - OpenAI: gpt-5.4, gpt-5.4-mini, gpt-5.4-nano - Anthropic: claude-opus-4-6, claude-sonnet-4-6, claude-haiku-4-5 - Google: gemini-2.5-pro, gemini-2.5-flash, gemini-3.1-pro, gemini-3.1-flash - Ollama: qwen3.5, qwen3-coder-next, deepseek-v3.2, and more (Use https://ollama.com cloud or override Base URL to http://localhost:11434 for local Ollama — no API key required for local) Your API key is stored locally on this device only (chrome.storage.local) and is never synced or sent to VibeTestQ. ────────────────────────────── HOW IT WORKS ────────────────────────────── 1. Install the extension. 2. Navigate to chrome://flags, enable "Experimental Web Platform features", and relaunch Chrome. 3. Open a WebMCP-enabled app (try VegCart at the link above). 4. Click the TAMASH icon to open the side panel. 5. Use Tool Tester to inspect and call tools manually, Agent to run AI-powered workflows, or Flow to replay saved sequences. ────────────────────────────── PRIVACY ────────────────────────────── - No data is sent to VibeTestQ - No analytics or telemetry - API keys and credentials are stored in chrome.storage.local only — never synced - Data is transmitted to third-party AI providers or Remote MCP endpoints only when you explicitly use those features - The extension does not read cookies, localStorage, browsing history, or DOM content beyond WebMCP tool responses Full privacy policy: https://vibetestq.com/tamash/privacy ────────────────────────────── REQUIREMENTS ────────────────────────────── - Chrome 146 or later - "Experimental Web Platform features" enabled at chrome://flags - A WebMCP-enabled web application (VegCart is provided as a ready-to-use demo) - An AI API key (OpenAI, Anthropic, Google, or Ollama) for Agent tab features (Tool Tester and Flow tabs work without any API key) ────────────────────────────── LINKS ────────────────────────────── Home: https://vibetestq.com/tamash/ User Guide & Flows: https://vibetestq.com/tamash/help VegCart Demo: https://vibetestq.com/testweb/vegcart/ Privacy Policy: https://vibetestq.com/tamash/privacy