Summary
Aparna Dhinakaran is an AI engineering researcher and thought leader who wrote “Sandboxes Are the Servers of the Harness Era” (2026), framed the sandbox as the server of the harness era, and identified trajectory as the most valuable artifact.
Key Points
- Core metaphor: The harness is the application, the sandbox is the server — same relationship as traditional software
- State ownership: Identified trajectory (reasoning history) as the valuable asset that determines leverage in the AI market
- Two state components:
- Trajectory: full record of questions, tool calls, decisions
- Local data: files, skills, analysis created in sandbox
- Two market versions: Labs control state (managed harnesses) vs enterprises control state (self-hosted sandboxes)
- Future vision: Swarms of long-running harnesses with coordinated trajectories
Open Questions
- How will trajectory ownership models evolve between labs and enterprises?
- What infrastructure will the “swarm” paradigm require?
Evidence Timeline
- 2026-04-20: Ingested “Sandboxes Are the Servers of the Harness Era” — defines sandbox as server, trajectory as durable artifact