Modeling Uncertainty in Code Review Agents: Non-Exclusive vs. Mutually Exclusive Risks
Accomplished-Fun4629 · reddit · 2026-08-13
A developer dives into the probabilistic modeling of decision-making uncertainty when building a code review agent. Based on evidence like PR descriptions and code diffs, the agent must decide whether to merge, run more tests, request human review, or block the PR.
The author analyzes two primary approaches to representing these probabilities:
- Non-exclusive risk dimensions: Assigning independent probabilities to bugs, vulnerabilities, and compatibility issues. This feels natural but risks double-counting evidence and complicates final decision-making.
- Mutually exclusive hidden states: Defining distinct states (e.g., Safe, Correctness failure) where probabilities sum to 100%. This is mathematically cleaner but struggles to model PRs that genuinely contain multiple overlapping issues.
The discussion touches upon the core challenge of balancing risk and epistemic uncertainty in autonomous engineering agents.
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