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Sandy Shen
Sandy Shen

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Stop tuning LLM agents with live API calls: A simulation-based approach

LLM agent configuration is a surprisingly large search space, including model choice, thinking depth, timeout, and context window. Most teams pick a setup once and never revisit it. Manual tuning with live API calls is slow and expensive, and usually only happens after something breaks.

We explored a different approach: simulate first, then deploy. Instead of calling the model for every trial, we built a lightweight parametric simulator and replayed hundreds of configuration variants offline. A scoring function selects the lowest-cost configuration that still meets quality requirements.

The full search completes in under 5 seconds.

A few patterns stood out:

  • Many agents are over-configured by default
  • Token usage can often be reduced without impacting output quality
  • Offline search is significantly faster than live experimentation

In practice, this approach reduced token cost by around 20-40% on real workloads.

We’re currently preparing the open-source release of the OpenClaw Auto-Tuner. If you’re interested, you can check the full write-up here:
https://zflow.ai/zflow_ai_insights_article_3.html

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