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The third rule arm, and the one the other two cannot reach. `write_path_rule` is keyed on code, `pre_tool_rule` on a command — both things the session is about to DO. A rule that governs what to SAY has no such trigger: extract intent from loose phrasing, raise a conflict before acting, hand off an action with its reason, end a finding with an offer all bind on a RESPONSE, and no tool call precedes one. The operator's message is the only query that exists before a response is composed. That hook searched notes alone, so no rule had ever been retrieved against a thing the operator actually said — and residency was the only surface those rules had, which is what milestone 394 removes. A SEPARATE FUNCTION, not a branch in build_autoinject_hint, because of its early returns. That arm bails when auto-inject is disabled, when the query is blank, when nothing clears the note bar — every one a statement about NOTES. Folded in, an operator who turned the awareness menu off would silently lose their rules, a coupling with no symptom since both look like a quiet hook. Two functions, two sets of gates, composed in the route. Guarded as "the rule arm never asks the notes arm's config", which is the structural fact. Joins _ARMS rather than getting its own test file. #3497's history is that the pre-tool arm inherited a defect from its sibling by being MODELLED on it instead of sharing with it, and a third arm modelled on two is two chances to repeat that. Repeat rendering, fresh-only counting, log-before-bailout, the kind register and the two-recorders identity are properties of every arm or of none. The bar is INHERITED and says so. 0.72 was tuned against code and commands; prose is a different query shape against the same documents, and triggers are written in the vocabulary of the moment — which for most rules is act vocabulary. Starting at the only number with evidence behind it and logging every call from the first deploy is what makes it settleable; guessing lower would put an unmeasured bar in front of a corpus that binds. k=3, anchored on this hook's own budget rather than the act arms'. RULEHINT_LIMIT is 1 because that arm fires before every Bash call; this one fires once per turn, beside a notes menu already spending three slots. And a prompt genuinely contains more than one act — "merge to main and then start on X" is two — where a command is one thing. `prompt_rule` added to RANKED_SOURCES: a ranker picked it, and a ranked source missing from that tuple is silently counted as bulk delivery and drops out of the pull-through denominator. The hook reads and writes the SHARED rule ledger under scribe-priorart, not a private one — one session keeps one list, aged (#3751), so a rule named here is not re-announced before the next Bash call. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_011cPyzNnegXHr5iRMzzy5KJ