BackSearch lets agents query the web as-of a past date to avoid future leakage
brianrkelly · x · 2026-07-24
BackSearch is a web search tool for agent backtesting that lets users set an asof date, so the model only sees information available at that point in time.
- Built to avoid future information leakage from normal web search in forecasting and prediction workflows.
- The team says they’ve been using it internally for RL environments to train models.
- The first release is a narrow news index for 2026, with plans to expand based on interest.
- It works with the same interface shape as standard web tools, but requires aligning the backtest date with the LLM’s pretraining cutoff.
Related event: BackSearch Released to Prevent Future Data Leakage in Agent Backtesting(4 posts)→
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