Working Notes on Agent Systems/Brad Zhang

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DeltaBox itself does something uncomplicated. The core is: checkpoint no longer copies...

DeltaBox itself does something uncomplicated. The core is: checkpoint no longer copies the entire sandbox. Only changes are saved. Kind of like git diff. The data in the paper a...

May 25, 2026 · 1 min read

DeltaBox itself does something uncomplicated. The core is: checkpoint no longer copies...
Figure 1 / source image

DeltaBox itself does something uncomplicated.

The core is: checkpoint no longer copies the entire sandbox.

Only changes are saved.

Kind of like git diff.

The data in the paper are quite exaggerated: checkpoint takes about 14ms and rollback takes about 5ms.

At this speed, the agent's trial and error cost will suddenly drop a lot.

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FORMATTOPICCAPABILITYMARKETcoverscoverssignalssignalsFORMATmedia dispatchTOPICagentsTOPIClong running agentsCAPABILITYagent workflowCAPABILITYlong-running agents
Mermaid outline
flowchart LR
  format-image_post["media dispatch"]
  topic-agents["agents"]
  topic-long-running-agents["long running agents"]
  capability-agent-workflow["agent workflow"]
  capability-long-running-agents["long-running agents"]
  format-image_post -->|covers| topic-agents
  format-image_post -->|covers| topic-long-running-agents
  format-image_post -->|signals| capability-agent-workflow
  format-image_post -->|signals| capability-long-running-agents

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DeltaBox itself does something uncomplicated. The core is: checkpoint no longer copie...THESISDeltaBox itself doessomethinguncomplicated. Thecore is: checkpoint noSIGNALDeltaBox itself doessomethinguncomplicated.OPERATORKind of like git diff.IMPLICATIONAt this speed, theagent's trial anderror cost willsuddenly drop a lot.
Mermaid outline
flowchart LR
  thesis["DeltaBox itself does something uncomplicated. The core is: checkpoint no longer copies the entire sandbox...."]
  signal["DeltaBox itself does something uncomplicated."]
  operator["Kind of like git diff."]
  implication["At this speed, the agent's trial and error cost will suddenly drop a lot."]
  thesis -->|frames| signal
  signal -->|develops| operator
  operator -->|lands in| implication

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