Context Contamination in Multi-Step Agents
ke1lle · reddit · 2026-07-12
While debugging a multi-step agent, the author realized that the real challenge isn't tool calling, but keeping the state clean at every step.
They demonstrated the issue with a quick test: summarize a PDF, call a weather API, then summarize another PDF. The final step ended up bleeding residual weather info from the previous step into the answer, causing the output to feel "contaminated." The author emphasizes:
- The need for tighter input boundaries
- The need for cleaner step outputs
- We can't assume the message array is always reliable
They also mentioned that while tools like EnterPro Agent Builder offer preview, publish, version, and rollback features, "context isolation" remains an open problem rather than something tools automatically solve.
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