Opentabs

OpenTabs gives AI agents access to web applications through the user's own authenticated browser session. It consists of an MCP server, a Chrome extension and a plugin SDK. Instead of taking screenshots or reading the page structure, each plugin calls the same internal APIs a web app's own frontend uses, routed through the browser tab where the user is already logged in, and returns the results to the agent. The project lists more than 100 plugins and roughly 2,000 tools, covering services such as Slack, Discord, GitHub, Jira, Notion, Figma, AWS, Stripe and Linear, along with built in browser tools that work on any tab. It works with Claude Code, Cursor, Windsurf, OpenCode and any MCP client that supports Streamable HTTP. A user can also point an AI at a site and have it analyze the page, discover the APIs and scaffold a new plugin, which can be published or kept private for internal tools. Installation is through npm with the opentabs command line tool. The design puts control with the user. Every plugin's tools start disabled, an AI can review a plugin's adapter code before it is enabled, permissions reset when a plugin updates, and every tool call is written to an audit log. The software runs locally with no cloud component and no telemetry, and the code is open source. The site publishes no pricing, and the tool is distributed as free open source software.