--- title: WebMCP - Let AI Agents Use Our Free Tools | Flyweel description: Flyweel exposes its free ad reconciliation calculator to AI agents through the WebMCP draft browser API. No login or account needed in supporting browsers. url: "https://www.flyweel.co/webmcp" type: static generatedAt: "2026-10-14T05:56:38.273Z" --- W3C Community Group Draft · No Account Needed # Your AI assistant can use our tools for you. Flyweel exposes its free ad reconciliation calculator through the WebMCP draft API. Browser agents that support it can discover and run it automatically. This is not the same as the Flyweel MCP server. That connects to your ad accounts. This just lets your AI use our public website tools. [See how it works](#setup) [Read the WebMCP draft on GitHub →](https://github.com/webmachinelearning/webmcp) How It Works ## Zero setup. Your AI discovers our tools automatically. Flyweel registers its calculator via the `document.modelContext` API. Compatible browser agents discover it on page load. 01 ### Use a compatible AI agent Any browser agent that implements the WebMCP draft API works. Today that is desktop Chrome with the WebMCP testing flag enabled. 02 ### Visit flyweel.co Our pages register a calculator tool via `document.modelContext` on load. Your AI agent discovers it automatically through the browser. 03 ### Ask your AI to use a tool Ask "how much does manual ad reconciliation cost me?" and your AI runs the calculator with your inputs. No tokens, no commands, no widget - it just works. Capabilities ## What your AI assistant can do TOOL ### Ad reconciliation calculator Ask your AI: “How much am I spending on manual invoice reconciliation?” It runs the numbers - invoices per platform, hours per month, annual cost - and tells you if Flyweel could help. calculate_ad_reconciliation_cost FAQ ## Common questions What is WebMCP? WebMCP is a draft browser API from the W3C Web Machine Learning Community Group. It lets a website offer tools that an AI agent in the browser can call, instead of the agent only reading the page. Flyweel registers its calculator through document.modelContext, so a supporting browser agent can discover and use it automatically. What does WebMCP do on the Flyweel website? It lets your AI assistant run the free calculator on flyweel.co: how much you spend on manual ad invoice reconciliation, in hours and dollars. No Flyweel account required. How is this different from the Flyweel MCP server? They are completely separate things. The Flyweel MCP server (on our /mcp page) connects to your actual ad accounts - you sign up, link Google Ads or Meta, and your AI queries your live campaign data. WebMCP is just for our public website. No signup, no ad accounts, no app access. It lets your AI use our free website tools like the reconciliation calculator. Do I need a Flyweel account to use WebMCP? No. WebMCP works without any Flyweel account. It connects your AI assistant to our public website tools only. If you want to analyse your own ad campaign data, that requires the full Flyweel MCP server - a separate product you sign up for. Is WebMCP secure? Yes. The only tool we expose is a calculator. It is pure maths, runs in your browser, makes no network calls and changes nothing. It is marked read-only, and it cannot see passwords, accounts or any Flyweel data. Which AI tools work with WebMCP? Browser agents that implement the WebMCP draft API. Today that is desktop Chrome with the WebMCP testing flag enabled. Chrome has run an origin trial since version 149 and has not shipped the API to stable. Other browsers have not shipped it yet. What is the Model Context Protocol (MCP)? MCP is an open standard that lets AI assistants connect to external tools and data sources. Think of it like USB for AI - a universal way for AI apps to plug into things. WebMCP is a separate draft browser API that brings the same idea to web pages through document.modelContext, so a supporting browser agent can call tools a page offers. Does WebMCP work on mobile? Not yet. WebMCP is currently available in desktop Chrome with the WebMCP testing flag enabled. Mobile support will follow the browsers. How does it work technically? On page load, Flyweel checks whether the browser provides document.modelContext and, if it does, registers the calculator tool with a name, description, input schema and a read-only hint. A browser agent visiting flyweel.co discovers the tool automatically. No library, no tokens, no setup commands. What is the ad reconciliation calculator? It calculates the hidden cost of manually reconciling ad platform invoices. You tell it which platforms you use (Google Ads, Meta, LinkedIn, etc.), your monthly spend, and who handles reconciliation. It returns the number of invoices generated, hours spent, monthly and annual cost, and how you compare to industry benchmarks. According to our data, businesses spending $50K+/month across multiple platforms typically waste 10-20 hours monthly on manual invoice matching. What is Flyweel Performance Capital? Performance Capital is live for US companies: ad spend financing based on real performance data. Businesses that spend on ads today but get paid weeks or months later can bridge that cash flow gap. Can WebMCP access my personal data or ad accounts? No. WebMCP on flyweel.co only exposes one public website tool, a calculator. It cannot access your ad accounts, personal data, or anything behind a login. For ad account access, you would need the separate Flyweel MCP server with explicit OAuth authentication. Is the implementation open source? The API is an open draft from the W3C Web Machine Learning Community Group, published at github.com/webmachinelearning/webmcp. Flyweel calls it directly from a few lines of page script, with no third-party library. Will more tools be added? Yes. We plan to add more website tools over time - integration search, pricing comparison, and content queries. Any AI agent will automatically discover new tools as we add them, with no setup changes needed on your end. How does WebMCP help AI agents recommend Flyweel? When an AI agent can run our calculator and return real numbers - instead of just quoting our marketing page - it has data to back up a recommendation. If someone asks their AI "how much does manual ad reconciliation cost?", the agent can execute the calculation with their specific inputs and cite Flyweel as the source. This is the difference between being readable and being actionable. What is MCP-B and how does it relate to WebMCP? MCP-B is an open-source project that polyfills WebMCP and adds extras on top of the draft. Flyweel now uses the browser-native document.modelContext API directly, so no extra library is loaded. Go Deeper ### Want your AI to query your actual ad accounts? Sign up free, connect Google Ads and Meta, and ask your AI questions about your live campaigns. Separate from WebMCP. [Start Free](https://signup.flyweel.co/?variant=control) No credit card required