diff --git a/eval/runner/all.ts b/eval/runner/all.ts
index aeb054621..4af3e4c68 100644
--- a/eval/runner/all.ts
+++ b/eval/runner/all.ts
@@ -24,8 +24,15 @@ interface CategoryRun {
 // One row per benchmark. Headline (Cat 1+2 combined) is the consolidated
 // before/after run on the full 240-page rich-prose corpus. Procedural
 // categories (3, 4, 7, 10, 12) test orthogonal capabilities.
+//
+// v0.10.5 additions:
+//   - Cat 2 Type Accuracy (rich prose): per-link-type accuracy measured
+//     directly on the 240-page corpus. The rich-prose bar for inferLinkType,
+//     distinct from Cat 1's retrieval metrics. Validates extraction regex
+//     work (works_at, advises) and exposes per-type confusion.
 const CATEGORIES = [
   { num: 1, name: 'Before/After PR #188 (240-page rich corpus, relational queries)', script: 'eval/runner/before-after.ts' },
+  { num: 2, name: 'Type Accuracy (per-link-type on rich prose)', script: 'eval/runner/type-accuracy.ts' },
   { num: 3, name: 'Identity Resolution', script: 'eval/runner/identity.ts' },
   { num: 4, name: 'Temporal Queries', script: 'eval/runner/temporal.ts' },
   { num: 7, name: 'Performance / Latency', script: 'eval/runner/perf.ts' },
diff --git a/eval/runner/type-accuracy.ts b/eval/runner/type-accuracy.ts
new file mode 100644
index 000000000..738a3fcf6
--- /dev/null
+++ b/eval/runner/type-accuracy.ts
@@ -0,0 +1,384 @@
+/**
+ * BrainBench — per-link-type accuracy on the 240-page rich-prose corpus.
+ *
+ * This is the measurement tool for v0.10.5+ extraction work. It:
+ *   1. Loads all pages from eval/data/world-v1/
+ *   2. Derives GOLD expected links per page from `_facts` metadata
+ *      (founders → founded, investors → invested_in, advisors → advises,
+ *       employees → works_at, attendees → attended, primary_affiliation →
+ *       works_at or founded based on role)
+ *   3. Runs extractPageLinks on each page → INFERRED links
+ *   4. Compares gold vs inferred per link type:
+ *       - correctly_typed: gold (src, tgt) exists AND inferred type matches
+ *       - mistyped:         gold (src, tgt) exists AND inferred type differs
+ *       - missed:           gold (src, tgt) exists AND no inferred edge
+ *       - spurious:         inferred (src, tgt) with no gold edge at all
+ *
+ * Emits a per-link-type table with type accuracy per type + overall.
+ * Headline metric: TYPE ACCURACY = correctly_typed / (correctly_typed + mistyped)
+ * conditional on the edge being found at all (excludes missed).
+ *
+ * Also emits a COMBINED metric: F1 per link type treating type as part of
+ * the identity — (src, tgt, type) triple must match. Catches both the
+ * extraction-recall problem and the type-accuracy problem in one number.
+ *
+ * Usage: bun eval/runner/type-accuracy.ts [--json]
+ */
+
+import { readdirSync, readFileSync } from 'fs';
+import { join } from 'path';
+import { extractPageLinks } from '../../src/core/link-extraction.ts';
+import type { PageType } from '../../src/core/types.ts';
+
+interface RichPage {
+  slug: string;
+  type: 'person' | 'company' | 'meeting' | 'concept';
+  title: string;
+  compiled_truth: string;
+  timeline: string;
+  _facts: {
+    type: string;
+    name?: string;
+    role?: string;
+    industry?: string;
+    primary_affiliation?: string;
+    secondary_affiliations?: string[];
+    founders?: string[];
+    employees?: string[];
+    investors?: string[];
+    advisors?: string[];
+    attendees?: string[];
+    related_companies?: string[];
+  };
+}
+
+interface GoldEdge {
+  from: string;
+  to: string;
+  type: string;
+}
+
+/** Load all rich-prose pages from the world-v1 shard directory. */
+function loadCorpus(dir: string): RichPage[] {
+  const files = readdirSync(dir).filter(f => f.endsWith('.json') && !f.startsWith('_'));
+  const out: RichPage[] = [];
+  for (const f of files) {
+    const p = JSON.parse(readFileSync(join(dir, f), 'utf-8'));
+    if (Array.isArray(p.timeline)) p.timeline = p.timeline.join('\n');
+    if (Array.isArray(p.compiled_truth)) p.compiled_truth = p.compiled_truth.join('\n\n');
+    p.title = String(p.title ?? '');
+    p.compiled_truth = String(p.compiled_truth ?? '');
+    p.timeline = String(p.timeline ?? '');
+    out.push(p as RichPage);
+  }
+  return out;
+}
+
+/**
+ * Derive the gold edge set from `_facts` metadata. Only edges where both
+ * endpoints are real pages in the corpus count (FK-constraint style).
+ *
+ * Rules:
+ *   company.founders  -> founded (person -> company)
+ *   company.employees -> works_at (person -> company)
+ *   company.investors -> invested_in (person -> company)
+ *   company.advisors  -> advises (person -> company)
+ *   meeting.attendees -> attended (person -> meeting)
+ *   person.primary_affiliation + role=founder       -> founded
+ *   person.primary_affiliation + role∈{engineer,...}-> works_at
+ *   person.primary_affiliation + role=advisor       -> advises
+ *   person.primary_affiliation + role=investor/partner -> invested_in
+ *   person.secondary_affiliations + role=advisor    -> advises
+ */
+function buildGoldEdges(pages: RichPage[]): GoldEdge[] {
+  const existing = new Set(pages.map(p => p.slug));
+  const edges: GoldEdge[] = [];
+  const push = (from: string, to: string, type: string) => {
+    if (!existing.has(from) || !existing.has(to)) return;
+    if (from === to) return;
+    edges.push({ from, to, type });
+  };
+
+  // Company-page -> incoming edges from people referenced in _facts arrays.
+  for (const p of pages) {
+    if (p._facts.type === 'company') {
+      for (const f of p._facts.founders ?? []) push(f, p.slug, 'founded');
+      for (const e of p._facts.employees ?? []) {
+        // Avoid double-labeling: if e is also a founder, prefer founded (more specific).
+        if ((p._facts.founders ?? []).includes(e)) continue;
+        push(e, p.slug, 'works_at');
+      }
+      for (const i of p._facts.investors ?? []) push(i, p.slug, 'invested_in');
+      for (const a of p._facts.advisors ?? []) push(a, p.slug, 'advises');
+    }
+    if (p._facts.type === 'meeting') {
+      // Direction: extractPageLinks on a meeting page produces
+      // (meeting_slug, person_slug, 'attended') because the person slugs
+      // appear as entity refs inside the meeting page's content. Match that
+      // direction in the gold so (from, to) pairs align with the inferred set.
+      for (const a of p._facts.attendees ?? []) push(p.slug, a, 'attended');
+    }
+  }
+
+  // Person-page -> outgoing primary_affiliation + secondaries.
+  for (const p of pages) {
+    if (p._facts.type !== 'person') continue;
+    const role = (p._facts.role ?? '').toLowerCase();
+    const primary = p._facts.primary_affiliation;
+    if (primary && existing.has(primary)) {
+      if (['founder', 'co-founder'].includes(role)) push(p.slug, primary, 'founded');
+      else if (role === 'advisor') push(p.slug, primary, 'advises');
+      else if (['partner', 'investor', 'vc'].includes(role)) push(p.slug, primary, 'invested_in');
+      else push(p.slug, primary, 'works_at');
+    }
+    for (const sec of p._facts.secondary_affiliations ?? []) {
+      if (!existing.has(sec)) continue;
+      // Secondary affiliations are typically advisory / board work.
+      if (role === 'advisor') push(p.slug, sec, 'advises');
+      else if (['partner', 'investor', 'vc'].includes(role)) push(p.slug, sec, 'invested_in');
+      else push(p.slug, sec, 'mentions');
+    }
+  }
+
+  // Dedup (same from/to/type edge could be added via multiple rules).
+  const seen = new Set<string>();
+  const dedup: GoldEdge[] = [];
+  for (const e of edges) {
+    const k = `${e.from}\u0000${e.to}\u0000${e.type}`;
+    if (seen.has(k)) continue;
+    seen.add(k);
+    dedup.push(e);
+  }
+  return dedup;
+}
+
+/** Run extractPageLinks on every page; return flat list of inferred edges. */
+function inferAllEdges(pages: RichPage[]): GoldEdge[] {
+  const edges: GoldEdge[] = [];
+  for (const p of pages) {
+    const content = `${p.title}\n\n${p.compiled_truth}\n\n${p.timeline}`;
+    const candidates = extractPageLinks(content, {}, p.type as PageType);
+    for (const c of candidates) {
+      edges.push({ from: p.slug, to: c.targetSlug, type: c.linkType });
+    }
+  }
+  return edges;
+}
+
+interface PerTypeResult {
+  linkType: string;
+  gold: number;
+  correctly_typed: number;  // gold edge present AND inferred type matches
+  mistyped: number;         // gold edge present AND inferred type differs
+  missed: number;           // gold edge present AND no inferred edge
+  spurious: number;         // inferred edge (this type) with no matching gold (any type) for (from, to)
+  type_accuracy: number;    // correctly_typed / (correctly_typed + mistyped)  [conditional on finding the edge]
+  recall: number;           // correctly_typed / gold
+  precision: number;        // correctly_typed / (correctly_typed + spurious_this_type_and_mistyped_from_other_types_into_this_type)
+  f1_strict: number;        // F1 where (from, to, type) triple must match exactly
+}
+
+interface ConfusionMatrix {
+  // matrix[goldType][inferredType] = count
+  [goldType: string]: Record<string, number>;
+}
+
+function score(gold: GoldEdge[], inferred: GoldEdge[]): {
+  perType: PerTypeResult[];
+  confusion: ConfusionMatrix;
+  overallTypeAccuracy: number;
+  overallStrictF1: number;
+} {
+  // Index gold by (from, to) pair — regardless of type.
+  const goldByPair = new Map<string, string>();  // key: from\u0000to → type
+  for (const g of gold) {
+    goldByPair.set(`${g.from}\u0000${g.to}`, g.type);
+  }
+
+  // Index inferred by (from, to, type).
+  const inferredByPair = new Map<string, string>();
+  for (const i of inferred) {
+    const key = `${i.from}\u0000${i.to}`;
+    // Keep the first inferred type for each pair; extractPageLinks already dedupes by (targetSlug, linkType).
+    if (!inferredByPair.has(key)) {
+      inferredByPair.set(key, i.type);
+    }
+  }
+
+  const linkTypes = new Set<string>();
+  for (const g of gold) linkTypes.add(g.type);
+  for (const i of inferred) linkTypes.add(i.type);
+
+  // Build confusion matrix: gold type → inferred type counts.
+  const confusion: ConfusionMatrix = {};
+  for (const t of linkTypes) confusion[t] = {};
+
+  for (const [pair, goldType] of goldByPair) {
+    const inferredType = inferredByPair.get(pair) ?? '(missing)';
+    confusion[goldType][inferredType] = (confusion[goldType][inferredType] ?? 0) + 1;
+  }
+  // Spurious edges (inferred without gold) tracked under '(no-gold)' rows.
+  confusion['(no-gold)'] = {};
+  for (const [pair, inferredType] of inferredByPair) {
+    if (!goldByPair.has(pair)) {
+      confusion['(no-gold)'][inferredType] = (confusion['(no-gold)'][inferredType] ?? 0) + 1;
+    }
+  }
+
+  const perType: PerTypeResult[] = [];
+  let overallCorrectlyTyped = 0;
+  let overallFound = 0;
+  let overallGold = 0;
+  let overallInferredThisTypeOrMistyped = 0;
+  // For overall strict F1:
+  let overallStrictTP = 0;
+  let overallStrictFP = 0;
+  let overallStrictFN = 0;
+
+  for (const t of linkTypes) {
+    if (t === '(no-gold)' || t === '(missing)') continue;
+    const goldCount = Object.values(confusion[t] ?? {}).reduce((a, b) => a + b, 0);
+    const correctly_typed = confusion[t]?.[t] ?? 0;
+    const missed = confusion[t]?.['(missing)'] ?? 0;
+    const mistyped = goldCount - correctly_typed - missed;
+
+    // Spurious for this type: inferred as this type, but gold had a different type OR no gold edge.
+    let spurious = 0;
+    // (a) inferred as t where gold was a DIFFERENT type: sum column t across other goldTypes
+    for (const gt of Object.keys(confusion)) {
+      if (gt === t || gt === '(missing)' || gt === '(no-gold)') continue;
+      spurious += confusion[gt]?.[t] ?? 0;
+    }
+    // (b) inferred as t with no gold edge at all
+    spurious += confusion['(no-gold)']?.[t] ?? 0;
+
+    const found = correctly_typed + mistyped;  // edge found (any type) where gold existed
+    const type_accuracy = found > 0 ? correctly_typed / found : 0;
+    const recall = goldCount > 0 ? correctly_typed / goldCount : 0;
+    const precisionDenom = correctly_typed + spurious;
+    const precision = precisionDenom > 0 ? correctly_typed / precisionDenom : 0;
+    const f1_strict =
+      precision + recall > 0 ? (2 * precision * recall) / (precision + recall) : 0;
+
+    perType.push({
+      linkType: t,
+      gold: goldCount,
+      correctly_typed,
+      mistyped,
+      missed,
+      spurious,
+      type_accuracy,
+      recall,
+      precision,
+      f1_strict,
+    });
+
+    overallCorrectlyTyped += correctly_typed;
+    overallFound += found;
+    overallGold += goldCount;
+    overallInferredThisTypeOrMistyped += correctly_typed + spurious;
+    overallStrictTP += correctly_typed;
+    overallStrictFN += mistyped + missed;  // gold edges not correctly-typed
+    overallStrictFP += spurious;
+  }
+
+  const overallTypeAccuracy = overallFound > 0 ? overallCorrectlyTyped / overallFound : 0;
+  const overallStrictPrecision =
+    overallStrictTP + overallStrictFP > 0
+      ? overallStrictTP / (overallStrictTP + overallStrictFP)
+      : 0;
+  const overallStrictRecall =
+    overallStrictTP + overallStrictFN > 0
+      ? overallStrictTP / (overallStrictTP + overallStrictFN)
+      : 0;
+  const overallStrictF1 =
+    overallStrictPrecision + overallStrictRecall > 0
+      ? (2 * overallStrictPrecision * overallStrictRecall) /
+        (overallStrictPrecision + overallStrictRecall)
+      : 0;
+
+  // Sort perType by gold count descending (most common first).
+  perType.sort((a, b) => b.gold - a.gold);
+
+  return { perType, confusion, overallTypeAccuracy, overallStrictF1 };
+}
+
+function pct(n: number, digits = 1): string {
+  return `${(n * 100).toFixed(digits)}%`;
+}
+
+async function main() {
+  const json = process.argv.includes('--json');
+  const dir = process.argv.find(a => a.startsWith('--dir='))?.slice('--dir='.length) ??
+    'eval/data/world-v1';
+  const log = json ? () => {} : console.log;
+
+  log('# BrainBench — type accuracy on rich-prose corpus\n');
+  log(`Generated: ${new Date().toISOString().slice(0, 19)}`);
+  log(`Corpus: ${dir}/`);
+
+  const pages = loadCorpus(dir);
+  log(`Loaded ${pages.length} pages.\n`);
+
+  const gold = buildGoldEdges(pages);
+  const inferred = inferAllEdges(pages);
+
+  log(`Gold edges (from _facts):     ${gold.length}`);
+  log(`Inferred edges (extractPageLinks): ${inferred.length}\n`);
+
+  const { perType, confusion, overallTypeAccuracy, overallStrictF1 } = score(gold, inferred);
+
+  log('## Per-link-type results\n');
+  log('| Link type    | Gold | Correct | Mistyped | Missed | Spurious | Type acc | Recall | Prec   | F1 (strict) |');
+  log('|--------------|------|---------|----------|--------|----------|----------|--------|--------|-------------|');
+  for (const r of perType) {
+    log(
+      `| ${r.linkType.padEnd(12)} | ${String(r.gold).padStart(4)} | ${String(r.correctly_typed).padStart(7)} | ${String(r.mistyped).padStart(8)} | ${String(r.missed).padStart(6)} | ${String(r.spurious).padStart(8)} | ${pct(r.type_accuracy).padStart(8)} | ${pct(r.recall).padStart(6)} | ${pct(r.precision).padStart(6)} | ${pct(r.f1_strict).padStart(11)} |`,
+    );
+  }
+  log('');
+  log('**Columns:**');
+  log('- *Type acc*: given the edge was found at all, was it typed correctly? `correct / (correct + mistyped)`.');
+  log('- *Recall*: of gold edges, how many did we correctly find AND type? `correct / gold`.');
+  log('- *Precision*: of edges we inferred as this type, how many were actually this type? `correct / (correct + spurious)`.');
+  log('- *F1 (strict)*: strict `(from, to, type)` triple match. Catches both extraction-recall and type-accuracy misses in one number.\n');
+
+  log('## Overall\n');
+  log(`- Overall type accuracy (conditional on finding the edge): **${pct(overallTypeAccuracy)}**`);
+  log(`- Overall strict F1 (triple match): **${pct(overallStrictF1)}**\n`);
+
+  log('## Confusion matrix (rows = gold type, cols = inferred type)\n');
+  const inferredCols = Array.from(
+    new Set(
+      Object.values(confusion).flatMap(row => Object.keys(row)),
+    ),
+  ).sort();
+  const rowKeys = Object.keys(confusion).filter(k => k !== '(no-gold)').sort();
+  rowKeys.push('(no-gold)');
+
+  const header = ['gold \\ inferred', ...inferredCols];
+  log('| ' + header.map(h => h.padEnd(14)).join(' | ') + ' |');
+  log('|' + header.map(() => '----------------').join('|') + '|');
+  for (const g of rowKeys) {
+    if (!confusion[g]) continue;
+    const row = [g, ...inferredCols.map(ic => String(confusion[g][ic] ?? 0))];
+    log('| ' + row.map(v => v.padEnd(14)).join(' | ') + ' |');
+  }
+  log('');
+
+  if (json) {
+    console.log(JSON.stringify({
+      overallTypeAccuracy,
+      overallStrictF1,
+      perType,
+      confusion,
+      goldTotal: gold.length,
+      inferredTotal: inferred.length,
+    }, null, 2));
+  }
+}
+
+main().catch(e => {
+  console.error(e);
+  process.exit(1);
+});