Web Agent — WebMCP Sidebar

Web Agent puts an AI agent in Chrome's side panel that can actually operate the website you're looking at — not by guessing at pixels or simulating clicks, but by using the tools the site itself provides. A growing number of websites expose their functionality to AI agents through WebMCP (navigator.modelContext), an emerging web standard from the W3C Web Machine Learning community. A design tool might expose "add shape" and "export canvas". A booking site might expose "search flights". Web Agent detects these tools automatically the moment you open a page — no setup, no configuration — and makes them available to the AI in your sidebar. You just ask for what you want, and the agent does it through the page's own, reliable interface. WHAT YOU CAN DO • Open the side panel on any WebMCP-enabled site and see its tools appear instantly • Ask the agent to perform multi-step tasks — it plans, calls the page's tools, and reports what changed • Watch every tool call as it happens, with inspectable inputs and results — nothing is hidden • Ask questions about any page, even without WebMCP tools, using the built-in page reader • Keep every conversation: chats are saved locally and can be reopened and resumed later YOUR MODELS, YOUR KEYS Web Agent is bring-your-own-key and works with the major providers you already use. Switch models mid-conversation, control reasoning effort on thinking models, and see streaming responses in a fast, minimal interface with dark and light themes. PRIVATE BY DESIGN There is no server behind this extension and no account to create. Your API keys and conversations are stored only in your browser profile. Chat content goes directly from your browser to the AI provider you chose — nowhere else. No analytics, no telemetry. WHO IT'S FOR If you're building a WebMCP-enabled site, Web Agent is the fastest way to test your tools against a real agent loop with real models. If you're just browsing, it's a glimpse of how the agentic web is supposed to work: sites offering their capabilities, and your agent — with your model, under your control — putting them to use.