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`report_preference` shipped reading PROMPTRULE_THRESHOLD_KEY, so the two arms were one dial: tuning the bar for an operator's prose silently retuned the lookup that runs when a task closes. That coupling is worse on this arm than it would be anywhere else. Every other retrieval arm scores a query that varies per call, so a mis-set bar shows up as a changed clear-rate. COMPLETION_QUERY is a fixed string, so this arm's best score for a given corpus is a CONSTANT — and a constant sitting under the bar is a dead arm rather than a quiet one. No volume of traffic reveals it. Found by the first live read for milestone 394 step 9: 69 calls, 69 declines, every one naming the same record at the same score (0.7194 against a 0.72 bar). Reading `best_available_id` (#3807) showed the record was about interpreting a REQUEST, not about report shape — so the declines were correct and the arm is healthy. The percentile alone would have said "lower the bar", which would have delivered a false positive on every completion report ever written. The bar does not move; the key does. Both defaults stay 0.72, so this changes no behaviour on any install — it makes "leave this one where it is" expressible, which it was not before. Settings grows the control (rules 25, 27), and the default-agreement check grows a row. Deliberately NOT included: a change to PROMPTRULE_DEFAULT_THRESHOLD. The evidence for moving it is this install's near-miss table, and rule 115 keeps a shipped default from being justified by one instance's corpus. That bar is a per-user setting and belongs in the operator's Settings, not in the product. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01821k5B3Ysecp9fNYs92Kuy