OneTool solves the MCP token tax problem by exposing 100+ tools through a single server instead of dozens. Instead of loading tool definitions that burn 3K-30K tokens per server, your agent writes Python code like `__run brave.search(query="react docs")` to call tools on demand. You get Brave search, Google Grounding, Tavily, Context7 docs, database queries, Excalidraw diagrams, file operations, Excel handling, Playwright browser automation, and Chrome DevTools utilities all from one connection. It includes smart context stores backed by SQLite FTS5, image vision routing to cheaper models, and LLM-powered text compaction. The architecture cuts token overhead by 96% compared to running separate MCP servers for each capability, which matters when you're paying per million tokens.