Component: L29_MLP
Hook: blocks.29.hook_mlp_out
Layer: 29
Role: L29 MLP's output points toward the correct answer in projection tests, but is not needed by itself in the full circuit. Directly removing or mean ablating L29 MLP does not reduce accuracy, so its answer-related signal is best described as redundant with other computation.
Additional note: L29 is retained as a disagreement case between attribution methods. Evidence for answer-related output: candidate-target logit lens has answer top-5 = 0.394 while pair-sum and operand targets stay near zero; Evidence against isolated necessity: direct zero-ablation leaves accuracy unchanged.