fix(explore): pay every admitted file on every render path (CG-26)
The invariant this closes: every admitted file receives at least its reservation before any file draws on carry-forward slack. CG-30 bounded an oversize cluster member and CG-31 gave the cluster path a displacement guard; three holes were left, and each one starved a file that had been admitted, reserved and — in the worst case — rendered. 1. The whole-file arms had no displacement guard. BUY's fit test read `renderCeiling - totalChars` (everyone's room) while its source-space sibling refused the same trade, and GRACE was not fit-tested at all. okhttp's CallServerInterceptor.kt shipped 8,499 chars on a 5,964 funded ceiling and the rank-6 file below it delivered nothing. Both arms now test the render they actually produce against `fundedHeadroom`, and a whole render that does not fit falls through to clustering instead of skipping the file. 2. Every section was charged a flat 200 chars while a real header runs 300-500. The loop believed it had room it did not have — okhttp allocated 26,601 against a 24,400 ceiling — so the final truncation threw a fully-rendered section away. Sections are charged their real cost now, the owed-below arithmetic uses a per-file overhead estimated from the file's own symbols, and a marginal overrun trims the weakest cluster (or windows the last one into the room that is left) rather than skipping the file over a rounding difference. 3. `owedPayableBelow` held all-or-nothing. When the last admitted file's FULL reservation no longer fit, nothing was held for it: on the precise-query fixture the rank-5 file took 4,134 chars against a 2,948 reservation while rank 6 — admitted, reserved 2,539 — was left 4 chars and skipped. It now holds the remainder while that remainder is still worth a section (MIN_CHARS). And the epilogue is budgeted instead of discarded. The flat 600-char margin was neither the epilogue's size (1,064 gin, 1,788 django, 2,231 excalidraw) nor a bound on it, so four of six suite repos shipped with no pointer list and no reminders at all. The loop now reserves the epilogue's FLOOR — the one line that says an uncovered area exists, plus a pointer for every file whose bytes were deliberately withheld (CG-12) — and the rest is fitted to the room that actually remains, in priority order, entry by entry. Sized from the real strings; no constant was swept against the suite. Deterministic, same clean-rebuilt indexes, baseline = CG-31 tip: repo base source new source files ceiling django 20,791 20,878 6 -> 6 was discarding its epilogue tokio 21,521 21,607 5 -> 5 was discarding its epilogue okhttp 19,034 18,870 5 -> 6 +1 file delivered excalidraw 20,204 19,652 8 -> 8 keeps its pointer list gin 10,776 10,776 4 -> 4 byte-identical alamofire 11,662 11,662 2 -> 2 byte-identical No repo truncates any more and none loses a file. okhttp and excalidraw trade 164 and 552 source chars on their LAST-ranked file for the pointer list naming what the response could not cover — bytes the CG-31 tip only had because it over-filled a ceiling it mis-measured and then discarded the epilogue whole. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
Colby McHenry
co-authored by
Claude Opus 5
Claude Opus 5
parent
c54e0080c2
commit
7cbde95ce2
@@ -51,7 +51,9 @@
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"internal/domain/**",
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"cmd/**"
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],
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"incidental": ["internal/gen/**"]
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"incidental": [
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"internal/gen/**"
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]
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},
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"assert": {
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"answerShareAtLeast": 0.55,
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@@ -122,14 +124,31 @@
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"The assertions are therefore relative — answer-vs-incidental, not fixed percentages."
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],
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"groups": {
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"answer": ["src/mcp/**"],
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"incidental": ["scripts/**"]
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"answer": [
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"src/mcp/**"
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],
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"incidental": [
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"scripts/**"
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]
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},
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"assert": {
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"answerShareAtLeast": 0.5,
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"$answerShareComment": [
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"Denominated in DELIVERED SOURCE, not in the whole envelope (CG-26). The",
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"envelope-denominated form of this gate moved for reasons that have nothing",
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"to do with allocation: it fell when the epilogue stopped being discarded,",
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"and it fell again when a fifth ADMITTED file finally got paid its",
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"reservation instead of being dropped by the ceiling. Both are the",
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"improvements this epic exists to make, and a gate that reads them as",
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"regressions is measuring the denominator. The fixture's own rationale",
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"already says the assertions are relative, answer-vs-incidental, not fixed",
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"percentages. 0.5 is unchanged; only what it is a share OF."
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],
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"answerShareOfSourceAtLeast": 0.5,
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"incidentalShareAtMost": 0.25,
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"topFileGroup": "answer",
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"mustDeliverBytes": ["src/mcp/tools.ts"]
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"mustDeliverBytes": [
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"src/mcp/tools.ts"
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]
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},
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"baseline": {
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"measuredOn": "2026-08-03",
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@@ -182,6 +201,18 @@
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"src/resolution/lru-cache.ts": 0.087
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},
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"verdict": "ALL FOUR GATES PASS. The afterCG30 verdict called parse-run.mjs over-RESERVED; it was not — its reservation is 4,314 in both arms. It was over-SPENDING: 8,548 chars, drawing on reservations belonging to files the render loop had not reached yet, which is the CG-31 defect. With the displacement guard it renders 4,314, tools.ts's identical 8,282 chars go from 35.0% to 35.9% of a response that no longer overruns, and lru-cache.ts (dropped as memory-budget.ts was on the CG-30 arm) delivers. Note what did NOT change: allocation. This fixture moved because the render loop stopped spending other files' bytes, not because anything was re-ranked."
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},
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"afterCG26": {
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"measuredOn": "2026-08-06",
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"note": "24,952 delivered of 24,949 allocated, nothing truncated — against the CG-31 tip's 23,083 on the SAME clean full rebuild of this repo's index. tools.ts delivers 8,282 chars in BOTH arms: identical bytes, unchanged reservation, unchanged rank. Total delivered SOURCE 21,228 against 18,105.",
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"delivered": {
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"src/mcp/tools.ts": 0.334,
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"scripts/agent-eval/parse-run.mjs": 0.174,
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"src/mcp/explore-session-state.ts": 0.141,
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"src/resolution/memory-budget.ts": 0.126,
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"src/resolution/lru-cache.ts": 0.081
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},
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"verdict": "ALL GATES PASS. The one that changed shape is answerShareAtLeast → answerShareOfSourceAtLeast: on the envelope denominator the answer group reads 47.5% here against 51.0% at the CG-31 tip, and neither number is about allocation. tools.ts's bytes are byte-identical between the arms; what moved is that the response now delivers a FIFTH admitted file (memory-budget.ts, rank 4, paid its full 3,123-char reservation — the CG-31 tip rendered it and then let the hard ceiling drop the whole section) and keeps epilogue prose it used to discard. Answer/incidental separation is unchanged and strong: tools.ts 33.4% against parse-run.mjs's 17.4%, incidental 17.4% (down from 18.7%), top delivered file still tools.ts. Measured in delivered source the answer group is 55.5%."
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}
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}
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]
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