The 2025 Anthropic London Builder Summit brought together developers, founders, and technical leaders for a one-day, in-person event focused on the future of AI-powered software. Held in London on October 1, the summit featured keynotes, product reveals, and deep-dive workshops on building autonomous agents, leveraging Anthropic’s Model Context Protocol, and deploying AI tools in real-world applications. Attendees also participated in panels with startup founders and hands-on demos, making the summit a hub for collaboration and innovation in the rapidly evolving AI ecosystem.