Working Notes on Agent Systems/Brad Zhang

@teach_fireworks / X longform

Recently, I have been debugging several Agents that can run for 2 to 3 hours. A very ob...

Recently, I have been debugging several Agents that can run for 2 to 3 hours. A very obvious feeling: Many problems are actually no longer at the model level. As the task gets l...

May 24, 2026 · 1 min read

Recently, I have been debugging several Agents that can run for 2 to 3 hours. A very ob...
Figure 1 / source image

Recently, I have been debugging several Agents that can run for 2 to 3 hours.

A very obvious feeling: Many problems are actually no longer at the model level.

As the task gets longer, what really starts to break down are: - session continuity - tool state - checkpoint - context drift.

Many demos look very strong.

But once you start entering long tasks, the runtime really exposes its complexity.

The Agent Runtime of 2026 is becoming more and more like a lightweight distributed system.

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FORMATTOPICCAPABILITYMARKETcoverscoverscoverscoverssignalssignalsFORMATlongform noteTOPICagentsTOPIClong running agentsTOPICmemoryTOPICtoolingCAPABILITYagent workflowCAPABILITYlong-running agents
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flowchart LR
  format-long_post["longform note"]
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  topic-long-running-agents["long running agents"]
  topic-memory["memory"]
  topic-tooling["tooling"]
  capability-agent-workflow["agent workflow"]
  capability-long-running-agents["long-running agents"]
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  format-long_post -->|covers| topic-long-running-agents
  format-long_post -->|covers| topic-memory
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  format-long_post -->|signals| capability-long-running-agents

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Recently, I have been debugging several Agents that can run for 2 to 3 hours. A very...THESISRecently, I have beendebugging severalAgents that can runfor 2 to 3 hours. ASIGNALRecently, I have beendebugging severalAgents that can runfor 2 to 3 hours.OPERATORMany demos look verystrong.IMPLICATIONThe Agent Runtime of2026 is becoming moreand more like alightweight
Mermaid outline
flowchart LR
  thesis["Recently, I have been debugging several Agents that can run for 2 to 3 hours. A very obvious feeling: Many..."]
  signal["Recently, I have been debugging several Agents that can run for 2 to 3 hours."]
  operator["Many demos look very strong."]
  implication["The Agent Runtime of 2026 is becoming more and more like a lightweight distributed system."]
  thesis -->|frames| signal
  signal -->|develops| operator
  operator -->|lands in| implication

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