bvandeusenandClaude Opus 5
c4908f093f
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Both arms used to drop a hit already on the session's exclusion ledger and emit nothing. That is correct only while the session still HOLDS what it was told, and a compaction breaks exactly that: the earlier injection is summarized away while the id stays on the ledger, leaving the rule absent from context AND unreachable for the rest of the session. #3749 closed the compaction half by clearing the ledger; this closes the ordinary half, where a session simply stops holding a line it read an hour ago. Only ONE CLAUSE of the existing line is false on a repeat — the claim that the rule is not in the session's loaded set — so only that clause changes. The fresh line is byte-identical to what it was. Both tails now come from one `_rule_hint_line`. The arms phrase their heads differently on purpose; everything after must not differ, and #3497's history is that the pre-tool arm inherited a defect by being modelled on its sibling rather than sharing with it. THE BUDGET DECISION, recorded at RULEHINT_LIMIT. A repeat competes for the single slot on rank alone: nothing is fetched behind it, and it never rides alongside as a second line. Promoting a fresh rule past a better-ranked repeat would reinstate the withholding one rank deeper, and a second line is the one thing the limit exists to forbid. The consequence is deliberate — a rule that keeps ranking first for a recurring situation keeps being referenced, and its decay belongs to exclusion ageing (#3751), not to a first-place rule being demoted for having won before. THE TELEMETRY, decided before shipping rather than after a number moved (#3752): nothing changes. A reference is a RENDERING decision, not a retrieval outcome. `results` stays `fresh`, `suppressed` stays len(hits) - len(fresh), and `record_rule_surfaced` still counts only what the arm freshly chose. This matters more than it reads: the naive implementation drops the `fresh` filter and takes suppressed_count to zero everywhere — and #3739's near-miss fix identifies repeat-caused zeros by `suppressed_count > 0`, so the contamination corrected on 2026-09-08 would return by a different route, in the same field, with the fix still in the code and no longer working. A test asserts the counters as unmoved, because "nothing changed" is only worth something if it is checkable. Also corrects two comments that outlived #3702 — both arms still claimed CONDITIONAL ONLY while the module-level note above RULEHINT_LIMIT said the opposite, in the exact code this change edits. GUARDS - an already-held hit produces a rule line at all (the regression), asserted on `get_rule(<id>)` rather than a truthy context: the write-path arm fills its context from four other sources, so truthiness passes under the OLD behaviour and pins nothing there. - the two tails are distinguishable, each excludes the other, and neither injects the rule statement — the budget claim, both branches. - the counters are unmoved, per #3752. - test_a_rule_the_session_already_holds_is_not_re_offered asserted the old contract (`"161" not in context`). Repinned rather than deleted: the telemetry half of what it protected still holds. Repinned the #3497 log-placement guard on structure (rule 167). It read `body.index("if not fresh:")` — a local variable NAME, not the property. This change renames that guard to `if not hits:`, so the old assertion would have raised ValueError and reported #3497 as back while the arm was entirely correct. Now walks the AST for the first early return after the search and asserts the call row is written before it. Falsified both ways: it fails on the #3497 mutation, and it refuses to pass when no early return exists at all. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_011cPyzNnegXHr5iRMzzy5KJ