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The Log Is the Agent
An agent's true state is not its model or runtime, but the immutable log of events that dictates its decision-making history.
What: The author argues that agents should be designed as event logs rather than monolithic loops. By treating the agent as a history of events, developers can better reconstruct, resume, and debug complex agentic workflows.
Why it matters: The industry is moving away from treating agents as 'black box' inferencing loops and toward observability-first architectures, where the audit trail of an agent's reasoning is the primary data structure.
Deep dive
- An agent's identity is defined by its history, not the underlying model or local runtime.
- Event logs enable perfect reconstruction of an agent's mental state and actions.
- Comparing agents to character save-states in video games (e.g., Skyrim) to explain persistence.
- Log-based architectures simplify complex, long-running agent workflows.
- Designing for logs allows for easier debugging when an agent goes off-track.
Decoder
- Observability: The ability to measure the internal states of a system by examining its external outputs and logs.
Original article
The Log Is the Agent
Think about a character you have spent 100 hours playing in Skyrim or Elden Ring. What exactly is your character? Is it the game engine? No. Is it the PlayStation? No. Is it the controller? No. Your...
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