MCP Dev Summit North America

At HubSpot, we recognized that any RPC with a schema is already a tool definition, so we built our AI tooling infrastructure on top of our existing RPC framework instead of starting from scratch. Engineering teams can now expose any API to internal agents, public MCP clients, and customer-facing AI products with just two annotations, enabling rapid development and tool reuse across all of our AI systems. This talk covers the architecture, the tradeoffs, and how this approach let us ship agentic capabilities faster than we ever expected.