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+# 2026-02-27 Session Notes
+
+## Predictor Bug Fix: Reject Mismatched candidate_features
+
+Nicholai implemented a fix to eliminate silent data corruption in `packages/predictor/src/main.rs` (line 79). The code previously silently replaced mismatched `candidate_features` vectors with all-zero values when their length didn't match `candidate_ids`. This masked upstream bugs and degraded ranking quality without signaling the problem.
+
+The fix changed the logic to:
+1. If `candidate_features` is empty → zero-fill (correct, feature not provided)
+2. If length matches `candidate_ids` → use as-is (correct, provided correctly)
+3. If provided but length mismatches → return explicit error (fixed from silent zero-fill)
+
+This brings consistency with how `candidate_embeddings` and `candidate_texts` already handle the same scenario (returning explicit length-mismatch errors). The change was applied via Edit tool and preserves the empty-features fallback behavior while fixing the dangerous silent-corruption case.
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