# History Cake > Self-guided audio tours that play automatically as you drive or walk past > historic places. Tours are built from geo-triggered "stories" — narrated > stops with locations, text, and media. Tours are the unit of purchase > (one-time, no subscription); free tours exist. ## For AI agents: build tours via MCP History Cake exposes a Model Context Protocol server. With a user's API key (created in Studio → Settings → API tokens; creator/admin accounts only) an AI can create tours and stories, import media from HTTPS URLs, tag content, validate publish-readiness, and publish. - MCP endpoint (Streamable HTTP): https://historycake.app/api/mcp (header: Authorization: Bearer hc_mcp_...) - stdio bridge: `npx -y @history-cake/mcp` with env HISTORY_CAKE_API_KEY - Full tool reference with JSON schemas: https://historycake.app/llms-full.txt - Human documentation: https://historycake.app/developers - npm package: https://www.npmjs.com/package/@history-cake/mcp ## Site - Tour catalog: https://historycake.app/tours - Tour pages: https://historycake.app/tours/{slug} - Story pages: https://historycake.app/tours/{slug}/stories/{storySlug} - How it works: https://historycake.app/how-it-works - About: https://historycake.app/about