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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@@ -150,6 +150,28 @@ function evaluate(fixture, report, text) {
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`answer ${pct(share('answer'))} delivered (${pct(allocated.get('answer') ?? 0)} allocated)`,
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);
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}
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// Same question against the SOURCE the response delivered rather than the
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// whole envelope (CG-26). The envelope-denominated gate above moves whenever
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// the response's prose does — the epilogue surviving instead of being
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// discarded costs it a point, and every additional admitted file that gets
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// paid dilutes it further — so it cannot tell "the answer was starved" from
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// "everything else was also delivered". Allocation is about source bytes;
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// measure it in source bytes.
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if (want.answerShareOfSourceAtLeast !== undefined) {
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const sourceBy = new Map();
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let totalSource = 0;
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for (const f of report.files) {
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const g = groupOf(f.path, groups);
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sourceBy.set(g, (sourceBy.get(g) ?? 0) + f.finalChars);
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totalSource += f.finalChars;
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}
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const answerSource = totalSource > 0 ? (sourceBy.get('answer') ?? 0) / totalSource : 0;
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add(
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`answer group takes >= ${pct(want.answerShareOfSourceAtLeast)} of DELIVERED SOURCE`,
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answerSource >= want.answerShareOfSourceAtLeast,
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`answer ${num(sourceBy.get('answer') ?? 0)} of ${num(totalSource)} source chars (${pct(answerSource)})`,
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);
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}
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if (want.incidentalShareAtMost !== undefined) {
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add(
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`incidental group takes <= ${pct(want.incidentalShareAtMost)} of the envelope`,
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@@ -0,0 +1,124 @@
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#!/usr/bin/env node
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/**
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* Deterministic 6-repo envelope sweep for `codegraph_explore` (CG-26).
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*
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* The allocation issues (CG-30 / CG-31 / CG-26) are all decided by how the
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* render loop divides a fixed byte ceiling, and the agent A/B is far too noisy
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* to see a 2K byte shift. This runs the SAME six queries the CG-30 and CG-31
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* benchmark tables use, against the same clean-rebuilt corpus indexes, and
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* prints the numbers those tables are made of: source chars delivered, files in
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* the final output, whether the hard ceiling cut anything, and whether the
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* epilogue survived.
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*
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* Numbers come from the CG-4 diagnostic (`CODEGRAPH_EXPLORE_DEBUG`), so this
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* measures the shipping allocator rather than re-deriving shares from markdown.
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*
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* Usage (needs a current `npm run build`, and full-REBUILT indexes — CG-33):
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* node scripts/agent-eval/probe-suite-envelope.mjs
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* node scripts/agent-eval/probe-suite-envelope.mjs --json > /tmp/new.json
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* node scripts/agent-eval/probe-suite-envelope.mjs --baseline /tmp/base.json
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* CORPUS=/tmp/codegraph-corpus node scripts/agent-eval/probe-suite-envelope.mjs
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*/
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import { mkdtempSync, readFileSync, rmSync, existsSync } from 'node:fs';
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import { tmpdir } from 'node:os';
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import { join, resolve } from 'node:path';
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import { pathToFileURL } from 'node:url';
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const CORPUS = process.env.CORPUS ?? '/tmp/codegraph-corpus';
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/** The six suite repos + the exact queries the CG-30/CG-31 tables were measured on. */
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const SUITE = [
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{ id: 'django', q: 'How does a QuerySet turn into SQL and fetch rows from the database?' },
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{ id: 'excalidraw', q: 'How does updating an element re-render the canvas on screen?' },
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{ id: 'okhttp', q: 'How does a call go through the interceptor chain to the network?' },
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{ id: 'tokio', q: 'How does a spawned task get scheduled and run by a worker?' },
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{ id: 'gin', q: 'How does a registered route handler get invoked for an incoming HTTP request?' },
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{ id: 'alamofire', q: 'How does a request get built and sent through the session?' },
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];
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const argv = process.argv.slice(2);
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const asJson = argv.includes('--json');
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const baselineAt = argv.includes('--baseline') ? argv[argv.indexOf('--baseline') + 1] : null;
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const only = argv.filter((a) => !a.startsWith('--') && a !== baselineAt);
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const say = (s = '') => { if (!asJson) console.log(s); };
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const num = (n) => Math.round(n).toLocaleString('en-US');
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const load = (rel) => import(pathToFileURL(resolve(rel)).href);
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const idx = await load('dist/index.js');
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const toolsMod = await load('dist/mcp/tools.js');
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const CodeGraph = idx.default?.default ?? idx.default ?? idx.CodeGraph;
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const ToolHandler = toolsMod.ToolHandler ?? toolsMod.default?.ToolHandler;
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if (typeof CodeGraph?.openSync !== 'function' || typeof ToolHandler !== 'function') {
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console.error('could not resolve CodeGraph/ToolHandler from dist/ — run `npm run build`');
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process.exit(2);
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}
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const tmp = mkdtempSync(join(tmpdir(), 'cg-suite-'));
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const results = [];
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try {
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for (const { id, q } of SUITE) {
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if (only.length > 0 && !only.includes(id)) continue;
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const repo = join(CORPUS, id);
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if (!existsSync(join(repo, '.codegraph', 'codegraph.db'))) {
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say(`${id}: no index at ${repo} — skipped`);
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continue;
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}
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const sidecar = join(tmp, `${id}.jsonl`);
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process.env.CODEGRAPH_EXPLORE_DEBUG = sidecar;
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const cg = CodeGraph.openSync(repo);
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const h = new ToolHandler(cg);
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const res = await h.execute('codegraph_explore', { query: q });
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const text = res.content?.[0]?.text ?? '';
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try { cg.close?.(); } catch { /* best effort */ }
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const report = JSON.parse(readFileSync(sidecar, 'utf8').trim().split('\n').pop());
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results.push({
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repo: id,
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sourceChars: report.envelope.sourceChars,
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envelopeChars: report.envelope.chars,
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allocatedChars: report.envelope.allocatedChars,
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hardCeiling: report.budget.hardCeiling,
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truncated: report.envelope.truncated,
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files: report.selection.filesInFinalOutput,
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// Did the response keep its trailing pointer list / notes, or did the
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// hard ceiling spend them? This is CG-26's residual 1.
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epilogueCut: text.includes('omitted for size'),
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sectionCut: text.includes('output truncated to budget'),
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notShown: text.includes('Not shown above'),
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budgetNote: text.includes('**Explore budget:'),
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});
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}
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} finally {
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rmSync(tmp, { recursive: true, force: true });
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}
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if (asJson) {
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console.log(JSON.stringify(results, null, 2));
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} else {
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const base = baselineAt ? JSON.parse(readFileSync(baselineAt, 'utf8')) : null;
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const byRepo = new Map((base ?? []).map((r) => [r.repo, r]));
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say('repo source Δ env files cut epilogue');
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say('-'.repeat(74));
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for (const r of results) {
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const b = byRepo.get(r.repo);
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const delta = b ? (r.sourceChars - b.sourceChars) : null;
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const dStr = delta === null ? '' : (delta > 0 ? `+${num(delta)}` : num(delta));
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const cut = r.sectionCut ? 'section' : r.epilogueCut ? 'epilogue' : '—';
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const epi = [r.notShown ? 'not-shown' : null, r.budgetNote ? 'budget-note' : null]
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.filter(Boolean).join('+') || 'none';
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say(
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`${r.repo.padEnd(12)} ${num(r.sourceChars).padStart(7)} ${dStr.padStart(8)} `
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+ `${num(r.envelopeChars).padStart(7)} ${String(r.files).padStart(5)} ${cut.padEnd(12)} ${epi}`,
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);
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}
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if (base) {
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const lost = results.filter((r) => {
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const b = byRepo.get(r.repo);
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return b && (r.sourceChars < b.sourceChars || r.files < b.files);
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});
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say('');
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say(lost.length === 0
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? 'No repo delivers less source or fewer files than the baseline.'
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: `REGRESSION: ${lost.map((r) => r.repo).join(', ')} deliver less than baseline.`);
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}
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}
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