Block opens Builderlab to sell Buzz AI-agent teams

Block is positioning Builderlab as a way to run itself as an intelligence company and then sell that capability outward. The launch builds on Buzz, its open-source workspace for humans and AI agents, which first shipped in July and has since added plug-ins that let anyone reshape the interface; account managers building personal dashboards have been the heaviest users of the companion apps platform.

The revenue model follows the classic open-source pattern: give the software away and charge for the convenience of a hosted cloud service. Block said little about commercialization or about Cash App, which brings in 60% of its revenue — a move enterprise editor Paul Gillin called savvy, since developers will build integrations and find new uses themselves. The company is making the push while its core business delivers a third straight guidance raise.

Security is the stated anchor for trust. Chief information security officer James Nettesheim said principles such as least privilege, isolated environments and egress controls still apply, and Block is building information flow control that tags data from sensitive sources so policy travels with the data. AI already reviews Block's code and sorts its security alerts, and Nettesheim said agents let defenders keep pace with attackers' machine speed. The next phase, per Block, will depend less on any single agent's capability than on how well agents collaborate, share context and stay inside firm boundaries.