TraceDiff prototype debugs voice agents by diffing success vs. failure traces
Responsible-Dot8405 · reddit · 2026-08-28
The author built a prototype called TraceDiff to address a frustrating voice-agent failure mode: the agent confidently claims success when a tool call actually failed.
How it works:
- Takes a known-good trace, a failed candidate trace, and an explicit behavioral rule.
- Aligns relevant observable events, identifies the earliest rule-related divergence, and extracts the minimal replay needed to reproduce the failure.
Example:
- Baseline: Cancellation tool returns ok, agent confirms.
- Candidate: Cancellation tool returns error, agent still confirms.
- TraceDiff: Reports regression and identifies the tool result as the earliest relevant difference.
Design: The diagnosis is cautious, suggesting the agent may have mishandled the error without claiming to know hidden reasoning. Missing evidence yields INCONCLUSIVE. A second rule was added for barge-in handling, measuring playback duration after interruption.
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