Banda, Hwang, and Kodwani write about Flux, DoorDash's in-house platform for delegating engineering tasks to cloud-based agentic workloads. Built to overcome the resource, security, and observability limitations of laptop-based agent execution, Flux automated 130,000 engineering tasks in a single month in 2026. The platform is organized around four composable primitives—sandboxes, an MCP gateway, playbooks, and invocation surfaces—that let teams define, run, and audit agent workflows without prescribing how each engineer structures their work.
- Sandboxes run on Firecracker microVMs with a 95th percentile end-to-end setup time under five seconds
- The Agent Gateway grants scoped, per-task permissions to internal systems (CI, observability, code search, deployment tools) and logs every action
- Playbooks are single YAML files that mix agentic steps with deterministic ones, letting teams shift logic between modes as requirements evolve
- Moving agent output from private Slack channels into public threads was the key adoption unlock
- Sandboxes run on Firecracker microVMs with a 95th percentile end-to-end setup time under five seconds
- The Agent Gateway grants scoped, per-task permissions to internal systems (CI, observability, code search, deployment tools) and logs every action
- Playbooks are single YAML files that mix agentic steps with deterministic ones, letting teams shift logic between modes as requirements evolve
- Moving agent output from private Slack channels into public threads was the key adoption unlock
