Start with a document or a question. Follow what catches your interest, open a new branch by asking more questions, go down the trail, return to any step along the way to keep exploring new trails.
Start in the browser, or start from the agent already doing your work
01browser-first
Start in the Browser
Already pay for Claude or ChatGPT? Run npx -y trail-bridge --app-url https://withtrail.app in Terminal and click the pairing link it prints — answers come from Claude Code or Codex on your machine, on your plan. Or bring an OpenRouter key, or point Trail at an OpenAI-compatible local model such as Ollama. Your trails and settings stay in this browser.
Bridge requests stay on your machine. OpenRouter requests go directly to OpenRouter. Local-model requests go only to the endpoint you configure.
Install the MCP server and open a trail from the agent you already use. Your agent answers; Trail keeps the branching canvas and every turn in the path.
The server and canvas run on your machine. Documents and questions go only to the agent you already use.