feat(ms-ai-architect): gjør reduksjonsenheten til dokumentet, ikke feltet [skip-docs]
Linje-cappen på 25 var ikke en reduksjon, men en seleksjon etter fast rekkefølge. Målt 2026-08-26 (bake-off arm A2b, flatt org/, 55 korpusdokumenter): 61 filer og 183 felt inn, 24 felt ut — alle fra 8 filer — mens 1 013 av de 4 000 verditegnene sto ubrukt. 53 filer var usynlige, og usynligheten var stille: brukeren tror pluginen er onboardet mens rådet er generisk. Sammendraget bygges ambient ved sesjonsstart, FØR det finnes et spørsmål, så det finnes ingen relevans å rangere mot. Når man ikke kan rangere, er det ærlige alternativet å dekke: - linjebudsjettet utledes fra filantallet (én linje per fil) i stedet for å være konstant, begrenset av MIN_COVERAGE_VALUE_LEN = 60 tegn per linje — forankret i den designede onboardingens egne feltlengder (median 34, snitt 75, maks 278) - seleksjonen er bredde-først på tvers av filer: hver fil gir fra seg sitt første felt før noen fil gir fra seg sitt andre. Emisjonsrekkefølgen er fortsatt filrekkefølgen, så leserekkefølgen er uendret - overflow-markøren oppgir hvor mange FILER som er utelatt, ikke bare felt Målt mot bake-off-harnesset (forhåndsregistrert gullsett, 40 spørsmål x 4 frikontekst-lengder), kontrollmålt mot git stash: n=55 A2b 10/160 -> 160/160 (kostnad 4 443 -> 4 923 tegn) n=25 A2b 10/160 -> 68/160 n=10 A2b 10/160 -> 24/160 A2b treffer nå last-alt-taket (identisk på alle fire korpusstørrelser) til 4 923 tegn mot 33 127. Ved den designede onboardingen (6 filer, 19 felt) er hookens output byte-identisk med før — kostnaden øker kun der den gamle koden skjulte dokumenter. Lesesiden verifisert ende-til-ende: hooken emitterer 62 linjer mot 25, med markøren "0 av 61 filer helt utelatt". Reach-metrikken sier at dokumentet er representert, ikke at svaret er riktig; hver fil bæres av ~65 tegn av sitt første felt. Den harde faktum-metrikken er ugyldig — dens egen kjent-positiv (last-alt) treffer bare 4/40. Tester: 7 nye i test-user-data.test.mjs (3 røde mot HEAD, verifisert med git stash). Sporet suite 1070/1070. [skip-docs]: intern reduksjonsmekanikk. Ingen kommando, agent, skill eller hook endrer grensesnitt; README/CLAUDE.md beskriver ingen av disse konstantene.
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2 changed files with 206 additions and 18 deletions
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@ -40,10 +40,26 @@ export const FREE_CONTEXT_FILE = 'free-context.md';
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const FREE_CONTEXT_LABEL = 'Fri kontekst';
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const DEFAULT_SUMMARY_CAP = 25; // max summary lines (hook-injection budget)
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// Minimum line budget: what a small, designed onboarding is allowed to spend
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// even when it has fewer files than lines. Above this floor the line budget is
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// derived from the file count (see coverageLineBudget) — because at scale the
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// binding cost is chars, not lines, and a fixed line count silently decides
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// WHICH documents exist.
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const DEFAULT_SUMMARY_CAP = 25;
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// The shortest value a coverage line may carry before it stops being a summary
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// and becomes a fragment. It bounds how far the one-line-per-file guarantee can
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// stretch: at most floor(maxTotalLen / this) lines.
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//
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// Anchored to the designed onboarding's own field lengths, measured 2026-08-26
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// over the real artefact (~/.claude/ms-ai-architect/org, 18 structured fields):
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// median 34 chars, mean 75, max 278. 60 keeps the median field whole with
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// headroom and cuts the mean one by about a fifth; below it the median field
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// starts breaking mid-sentence. With the 4000-char budget this permits 66 lines.
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const MIN_COVERAGE_VALUE_LEN = 60;
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// Total char budget for the field VALUES of one summary, shared across the
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// fields that survive DEFAULT_SUMMARY_CAP.
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// fields that survive the line budget (see coverageLineBudget).
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//
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// Why a TOTAL budget and not the per-field cap it replaces: the summary is
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// injected ambiently at EVERY session start, so what costs is the total, not
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@ -58,10 +74,15 @@ const DEFAULT_SUMMARY_CAP = 25; // max summary lines (hook-injection budget)
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// Why 4000 specifically: that is exactly what the old form already permitted at
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// its worst case — DEFAULT_SUMMARY_CAP (25) lines x the old 160-char per-field
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// cap. The budget is therefore cost-neutral against today's ceiling and
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// strictly better below it. Because it is shared only over the fields that
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// survive the line cap (at most 25), no field is ever allocated less than
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// 4000/25 = 160: the old cap becomes the new floor, reached only at exactly 25
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// fields. Raising this number raises the cost of every session in the repo.
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// strictly better below it. Raising this number raises the cost of every
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// session in the repo.
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//
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// The per-field floor this comment used to promise (4000/25 = 160, "reached
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// only at exactly 25 fields") held only while the line cap was fixed at 25. It
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// is not a property of the budget — it was a property of the defect the line
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// cap turned out to be. The floor that survives is MIN_COVERAGE_VALUE_LEN,
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// which is what the line budget is derived FROM rather than what falls out of
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// it.
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const DEFAULT_MAX_TOTAL_LEN = 4000;
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/** The user-owned data root: ~/.claude/ms-ai-architect/ (survives reinstall). */
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@ -202,6 +223,62 @@ export function orderOrgFiles(names) {
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return [...ORG_FILES.filter((n) => present.has(n)), ...extra];
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}
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/**
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* The line budget for one summary: enough lines to give every file at least one
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* field, but never so many that a line drops below MIN_COVERAGE_VALUE_LEN, and
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* never fewer than DEFAULT_SUMMARY_CAP.
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*
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* Why the count is derived and not a constant: this summary is injected
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* ambiently at session start, BEFORE any question exists, so there is no
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* relevance signal to rank fields against. A fixed line count therefore does
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* not reduce — it SELECTS, by whatever order the files happen to be in.
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* Measured 2026-08-26 (bake-off arm A2b, flat org/, 55 corpus documents): 61
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* files and 183 fields in, 24 fields out, all from 8 files, with 1013 of the
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* 4000 value chars unspent. When you cannot rank, the honest substitute is to
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* cover: spend the budget across documents rather than on the first few.
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*
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* Pure.
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* @param {number} fileCount
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* @param {number} maxTotalLen
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* @returns {number}
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*/
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function coverageLineBudget(fileCount, maxTotalLen) {
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const affordable = Math.floor(maxTotalLen / MIN_COVERAGE_VALUE_LEN);
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return Math.max(DEFAULT_SUMMARY_CAP, Math.min(fileCount + 1, affordable));
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}
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/**
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* Choose which of the collected fields survive, breadth-first across their
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* source files: every file gives up its first field before any file gives up
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* its second. Returns a Set of indices into `fields` — SELECTION only; the
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* caller still emits in the original file order, so reading order is unchanged.
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*
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* Pure.
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* @param {Array<[string, string, string]>} fields [header, value, sourceFile]
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* @param {number} room how many fields may be emitted
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* @returns {Set<number>}
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*/
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function pickBreadthFirst(fields, room) {
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const byFile = new Map();
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fields.forEach(([, , file], i) => {
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if (!byFile.has(file)) byFile.set(file, []);
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byFile.get(file).push(i);
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});
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const picked = new Set();
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const queues = [...byFile.values()];
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for (let round = 0; picked.size < room; round++) {
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let handedOut = false;
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for (const q of queues) {
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if (round >= q.length) continue;
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picked.add(q[round]);
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handedOut = true;
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if (picked.size >= room) break;
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}
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if (!handedOut) break; // every file exhausted
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}
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return picked;
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}
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/**
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* Build a compact, deterministic org-context summary from org file contents.
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* PURE — takes a `{ filename: contentString }` map (the caller reads the files)
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@ -213,21 +290,34 @@ export function orderOrgFiles(names) {
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* without silently emptying the summary.
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*
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* @param {Record<string, string|null>|null|undefined} orgFiles
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* @param {{cap?: number, maxTotalLen?: number}} [opts]
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* @param {{cap?: number, maxTotalLen?: number}} [opts] `cap` is a hard line
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* ceiling; omit it to get the coverage-derived budget, which is the form the
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* hook uses.
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* @returns {string}
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*/
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export function buildOrgSummary(orgFiles, opts = {}) {
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if (!orgFiles || typeof orgFiles !== 'object') return '';
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const cap = opts.cap ?? DEFAULT_SUMMARY_CAP;
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const maxTotalLen = opts.maxTotalLen ?? DEFAULT_MAX_TOTAL_LEN;
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// An explicit cap is a plain ceiling (callers that ask for N lines get N).
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// The DEFAULT is derived from how many files there are, so growth in org/
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// widens the summary instead of silently hiding documents behind it.
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const cap =
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opts.cap ??
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coverageLineBudget(
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orderOrgFiles(Object.keys(orgFiles)).length + (orgFiles[FREE_CONTEXT_FILE] ? 1 : 0),
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maxTotalLen,
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);
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// Collect UNCUT [label, value] pairs first: the char budget can only be spent
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// fairly once it is known which fields the line cap actually emits.
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// Collect UNCUT [header, value, sourceFile] triples first: the char budget can
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// only be spent fairly once it is known which fields the line budget emits.
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// Provenance is carried because the reduction unit is the DOCUMENT, not the
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// field — without it the cut cannot tell whether it is dropping a file's
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// fifth field or its only one.
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const fields = [];
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for (const name of orderOrgFiles(Object.keys(orgFiles))) {
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const content = orgFiles[name];
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if (typeof content !== 'string' || !content.trim()) continue;
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for (const section of extractSections(content)) fields.push(section);
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for (const [header, value] of extractSections(content)) fields.push([header, value, name]);
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}
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// Free-prose context (C2.2, #3): the optional free-text file, surfaced LAST as
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@ -238,7 +328,7 @@ export function buildOrgSummary(orgFiles, opts = {}) {
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if (typeof freeContent === 'string' && freeContent.trim()) {
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const body = collapseProse(freeContent);
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if (body) {
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fields.push([FREE_CONTEXT_LABEL, body]);
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fields.push([FREE_CONTEXT_LABEL, body, FREE_CONTEXT_FILE]);
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hasFreeContext = true;
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}
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}
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@ -246,6 +336,9 @@ export function buildOrgSummary(orgFiles, opts = {}) {
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if (fields.length === 0) return '';
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// Budget 1 — lines: over cap, keep (cap-1) fields plus a marker for the rest.
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// WHICH fields is decided breadth-first across source files, so the cut is a
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// reduction and not a fixed-order selection (see coverageLineBudget). The
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// emission order below is still the file order, so reading order is stable.
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//
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// "Fri kontekst" is exempt from that cut. It is appended LAST so it reads last,
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// which under a plain head-slice made it the FIRST field to disappear — and it
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@ -253,18 +346,30 @@ export function buildOrgSummary(orgFiles, opts = {}) {
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// the single category that most sharpens the advice. Position in the summary
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// is a reading order, not a priority order; the cut must not conflate them.
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const overflow = fields.length > cap;
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const room = Math.max(0, cap - 1); // fields emittable alongside the marker
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let kept = fields;
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if (overflow) {
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kept =
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hasFreeContext && room >= 1
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? [...fields.slice(0, room - 1), fields[fields.length - 1]]
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: fields.slice(0, room);
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const room = Math.max(0, cap - 1); // fields emittable alongside the marker
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const structured = hasFreeContext ? fields.slice(0, -1) : fields;
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const picked = pickBreadthFirst(structured, hasFreeContext ? Math.max(0, room - 1) : room);
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kept = structured.filter((_, i) => picked.has(i));
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if (hasFreeContext && room >= 1) kept.push(fields[fields.length - 1]);
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}
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// Budget 2 — chars: shared max-min fairly over the fields actually emitted.
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const allowance = allocateBudget(kept.map(([, value]) => value.length), maxTotalLen);
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const lines = kept.map(([header, value], i) => `${header}: ${capValue(value, allowance[i])}`);
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if (overflow) lines.push(`… (+${fields.length - kept.length} flere felt)`);
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if (overflow) {
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// Report the files left out, not only the fields. A file with nothing
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// emitted is invisible to the session, and the measured failure mode was
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// exactly that it was invisible SILENTLY — the user believes the plugin is
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// onboarded while the advice is generic.
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const keptFiles = new Set(kept.map(([, , file]) => file));
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const allFilesCount = new Set(fields.map(([, , file]) => file)).size;
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const droppedFiles = allFilesCount - keptFiles.size;
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lines.push(
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`… (+${fields.length - kept.length} flere felt; ` +
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`${droppedFiles} av ${allFilesCount} filer helt utelatt)`,
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);
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}
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return lines.join('\n');
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}
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@ -375,3 +375,86 @@ test('buildOrgSummary — overflow without free-context is unchanged (back-compa
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assert.equal(lines[8], 'Felt8: verdi8');
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assert.match(lines[9], /flere felt/);
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});
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// ===========================================================================
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// (E) Reduksjon ved SKALA — the unit of reduction is the DOCUMENT, not the
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// field. Measured 2026-08-26 (bake-off arm A2b, flat org/, n=55 corpus
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// docs): 61 files and 183 fields went in, 24 fields came out, and those 24
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// came from 8 files — 53 files were invisible while 1013 of the 4000 value
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// chars stood unspent. What remained was selection by FIXED ORDER, which is
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// relevance-blind, and the summary is built ambiently at session start —
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// before any question exists — so there is no relevance signal to rank
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// against. The honest substitute for ranking is COVERAGE.
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// ===========================================================================
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test('buildOrgSummary — every file contributes at least one field when the budget allows it', () => {
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const all = {};
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for (let f = 0; f < 40; f++) {
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all[`fil${String(f).padStart(2, '0')}.md`] = Array.from(
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{ length: 3 },
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(_, i) => `## F${f}H${i}\nverdi fra fil ${f} felt ${i}`,
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).join('\n\n');
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}
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const s = buildOrgSummary(all);
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const missing = [];
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for (let f = 0; f < 40; f++) {
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if (!new RegExp(`^F${f}H\\d: `, 'm').test(s)) missing.push(f);
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}
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assert.deepEqual(missing, [], `every file must reach the summary; ${missing.length}/40 did not`);
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});
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test('buildOrgSummary — selection is breadth-first across files, not fixed order within one', () => {
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const all = {
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'organization-profile.md': '## A0\na0\n\n## A1\na1\n\n## A2\na2',
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'technology-stack.md': '## B0\nb0\n\n## B1\nb1\n\n## B2\nb2',
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'security-compliance.md': '## C0\nc0\n\n## C1\nc1\n\n## C2\nc2',
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};
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// cap 4 => 3 field lines + marker. Fixed order would spend all three on the
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// first file; coverage spends one on each.
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const lines = buildOrgSummary(all, { cap: 4 }).split('\n');
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assert.deepEqual(lines.slice(0, 3), ['A0: a0', 'B0: b0', 'C0: c0']);
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assert.match(lines[3], /flere felt/);
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});
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test('buildOrgSummary — the overflow marker reports how many FILES were cut, not only fields', () => {
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const all = {};
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for (let f = 0; f < 200; f++) all[`fil${String(f).padStart(3, '0')}.md`] = `## H${f}\nverdi ${f}`;
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const s = buildOrgSummary(all);
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const marker = s.split('\n').at(-1);
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assert.match(marker, /flere felt/, 'field residue still reported');
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assert.match(marker, /\d+ filer/, 'file residue must be named — a silent drop is the defect');
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});
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test('buildOrgSummary — coverage yields to the char budget, never starving lines to fragments', () => {
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const all = {};
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for (let f = 0; f < 200; f++) all[`fil${String(f).padStart(3, '0')}.md`] = `## H${f}\n${'x'.repeat(400)}`;
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const s = buildOrgSummary(all);
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const values = s.split('\n').filter((l) => /^H\d+: /.test(l)).map((l) => l.slice(l.indexOf(': ') + 2));
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assert.ok(values.length > 0, 'fields emitted');
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for (const v of values) {
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assert.ok(v.length >= 60, `a coverage line must stay readable, got ${v.length}`);
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}
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assert.ok(
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values.reduce((a, v) => a + v.length, 0) <= 4000,
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'the total value budget still binds at scale',
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);
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});
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test('buildOrgSummary — the designed onboarding size is untouched by the coverage rule', () => {
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const all = {};
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for (const f of ORG_FILES) {
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all[f] = Array.from({ length: 4 }, (_, i) => `## ${f}-Felt${i}\nverdi${i}`).join('\n\n');
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}
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const lines = buildOrgSummary(all).split('\n');
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assert.equal(lines.length, 20, '20 fields over 5 files fit; no marker, no reordering');
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assert.equal(lines[0], 'organization-profile.md-Felt0: verdi0');
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assert.equal(lines[3], 'organization-profile.md-Felt3: verdi3');
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});
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test('buildOrgSummary — Fri kontekst still survives the cut at scale', () => {
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const all = {};
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for (let f = 0; f < 40; f++) all[`fil${String(f).padStart(2, '0')}.md`] = `## H${f}\nverdi ${f}`;
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all['free-context.md'] = 'Den ene sloten der brukeren skriver fritt.';
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const s = buildOrgSummary(all, { cap: 10 });
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assert.match(s, /Fri kontekst: Den ene sloten/, 'free-context must not be the first field dropped');
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});
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