diff --git a/packages/adf/src/__tests__/classifier-config.test.ts b/packages/adf/src/__tests__/classifier-config.test.ts
new file mode 100644
index 0000000..16c0d04
--- /dev/null
+++ b/packages/adf/src/__tests__/classifier-config.test.ts
@@ -0,0 +1,59 @@
+import { describe, it, expect } from 'vitest';
+import { classifyElement, buildMigrationPlan } from '../content-classifier';
+import type { ClassifierConfig } from '../content-classifier';
+import type { MarkdownElement, MarkdownSection } from '../markdown-parser';
+
+function rule(content: string, strength: 'imperative' | 'advisory' | 'neutral' = 'imperative'): MarkdownElement {
+  return { type: 'rule', content, strength };
+}
+
+describe('ClassifierConfig', () => {
+  describe('stayPatterns', () => {
+    it('uses default patterns when config omitted', () => {
+      const result = classifyElement(rule('Use WSL credential.helper'), 'Setup');
+      expect(result.decision).toBe('STAY');
+    });
+
+    it('overrides stay patterns with custom list', () => {
+      const config: ClassifierConfig = { stayPatterns: [/\bcustom-env\b/i] };
+      // WSL no longer triggers STAY with custom patterns
+      const r1 = classifyElement(rule('Use WSL credential.helper'), 'Setup', undefined, config);
+      expect(r1.decision).toBe('MIGRATE');
+      // Custom pattern does trigger STAY
+      const r2 = classifyElement(rule('Set custom-env variable'), 'Setup', undefined, config);
+      expect(r2.decision).toBe('STAY');
+    });
+  });
+
+  describe('headingRoutes', () => {
+    it('uses default heading routes when config omitted', () => {
+      const result = classifyElement(rule('Use React hooks'), 'Frontend Design');
+      expect(result.targetModule).toBe('frontend.adf');
+    });
+
+    it('overrides heading routes with custom list', () => {
+      const config: ClassifierConfig = {
+        headingRoutes: [{ pattern: /\binfra\b/, module: 'infra.adf' }],
+      };
+      // "Frontend" no longer matches custom routes → core.adf
+      const r1 = classifyElement(rule('Use React hooks'), 'Frontend Design', undefined, config);
+      expect(r1.targetModule).toBe('core.adf');
+      // "Infra" matches custom route
+      const r2 = classifyElement(rule('Use Terraform'), 'Infra Setup', undefined, config);
+      expect(r2.targetModule).toBe('infra.adf');
+    });
+  });
+
+  describe('buildMigrationPlan threading', () => {
+    it('threads config to classifyElement', () => {
+      const sections: MarkdownSection[] = [
+        { heading: 'Infra', elements: [rule('Provision servers')] },
+      ];
+      const config: ClassifierConfig = {
+        headingRoutes: [{ pattern: /\binfra\b/, module: 'infra.adf' }],
+      };
+      const plan = buildMigrationPlan(sections, undefined, undefined, config);
+      expect(plan.migrateItems[0].classification.targetModule).toBe('infra.adf');
+    });
+  });
+});
diff --git a/packages/adf/src/__tests__/strength-config.test.ts b/packages/adf/src/__tests__/strength-config.test.ts
new file mode 100644
index 0000000..7937805
--- /dev/null
+++ b/packages/adf/src/__tests__/strength-config.test.ts
@@ -0,0 +1,35 @@
+import { describe, it, expect } from 'vitest';
+import { parseMarkdownSections } from '../markdown-parser';
+import type { StrengthConfig } from '../markdown-parser';
+
+describe('StrengthConfig', () => {
+  const md = '## Rules\n- ALWAYS do X\n- prefer Y\n- do Z';
+
+  it('uses default patterns when config omitted', () => {
+    const sections = parseMarkdownSections(md);
+    const rules = sections[0].elements;
+    expect(rules[0].strength).toBe('imperative');
+    expect(rules[1].strength).toBe('advisory');
+    expect(rules[2].strength).toBe('neutral');
+  });
+
+  it('respects custom imperativePatterns', () => {
+    const config: StrengthConfig = { imperativePatterns: [/\bdo Z\b/] };
+    const sections = parseMarkdownSections(md, config);
+    const rules = sections[0].elements;
+    // "ALWAYS" no longer matches custom list → neutral
+    expect(rules[0].strength).toBe('neutral');
+    // "do Z" now matches imperative
+    expect(rules[2].strength).toBe('imperative');
+  });
+
+  it('respects custom advisoryPatterns', () => {
+    const config: StrengthConfig = { advisoryPatterns: [/\bdo Z\b/] };
+    const sections = parseMarkdownSections(md, config);
+    const rules = sections[0].elements;
+    // "prefer" no longer matches custom list → neutral
+    expect(rules[1].strength).toBe('neutral');
+    // "do Z" now matches advisory
+    expect(rules[2].strength).toBe('advisory');
+  });
+});
diff --git a/packages/adf/src/content-classifier.ts b/packages/adf/src/content-classifier.ts
index ab300db..74174b5 100644
--- a/packages/adf/src/content-classifier.ts
+++ b/packages/adf/src/content-classifier.ts
@@ -21,6 +21,12 @@ export type WeightTag = 'load-bearing' | 'advisory';
 /** Module path → lowercase trigger keywords for content-based routing. */
 export type TriggerMap = Record<string, string[]>;
 
+/** Optional overrides for classification heuristics. */
+export interface ClassifierConfig {
+  stayPatterns?: RegExp[];
+  headingRoutes?: Array<{ pattern: RegExp; module: string }>;
+}
+
 export interface ClassificationResult {
   decision: RouteDecision;
   targetSection: AdfTargetSection;
@@ -69,23 +75,29 @@ const STAY_PATTERNS: RegExp[] = [
 // Classification Helpers
 // ============================================================================
 
-function matchesStayPattern(text: string): boolean {
-  return STAY_PATTERNS.some(p => p.test(text));
+function matchesStayPattern(text: string, patterns: RegExp[] = STAY_PATTERNS): boolean {
+  return patterns.some(p => p.test(text));
 }
 
 /**
  * Map a heading name to the most appropriate ADF target module.
  */
-function headingToModule(heading: string): string {
+function headingToModule(heading: string, routes?: ClassifierConfig['headingRoutes']): string {
   const lower = heading.toLowerCase();
 
+  if (routes) {
+    for (const route of routes) {
+      if (route.pattern.test(lower)) return route.module;
+    }
+    return 'core.adf';
+  }
+
   if (/\b(design.system|ui|frontend|css|component|react|vue|svelte)\b/.test(lower)) {
     return 'frontend.adf';
   }
   if (/\b(api|backend|deploy|server|database|db|endpoint)\b/.test(lower)) {
     return 'backend.adf';
   }
-  // Default: everything routes to core.adf
   return 'core.adf';
 }
 
@@ -120,9 +132,10 @@ export function classifyElement(
   element: MarkdownElement,
   heading: string,
   triggerMap?: TriggerMap,
+  config?: ClassifierConfig,
 ): ClassificationResult {
   const text = element.content;
-  let module = headingToModule(heading);
+  let module = headingToModule(heading, config?.headingRoutes);
 
   // Content-based fallback: when heading routes to core.adf, check element
   // content against ON_DEMAND trigger keywords from the manifest.
@@ -131,7 +144,7 @@ export function classifyElement(
   }
 
   // Check STAY patterns first
-  if (matchesStayPattern(text)) {
+  if (matchesStayPattern(text, config?.stayPatterns)) {
     return {
       decision: 'STAY',
       targetSection: 'CONTEXT',
@@ -291,6 +304,7 @@ export function buildMigrationPlan(
   sections: MarkdownSection[],
   existingAdf?: AdfDocument,
   triggerMap?: TriggerMap,
+  config?: ClassifierConfig,
 ): MigrationPlan {
   const items: MigrationItem[] = [];
 
@@ -310,7 +324,7 @@ export function buildMigrationPlan(
 
   for (const section of sections) {
     for (const element of section.elements) {
-      const classification = classifyElement(element, section.heading, triggerMap);
+      const classification = classifyElement(element, section.heading, triggerMap, config);
 
       // Dedup against existing ADF
       if (classification.decision === 'MIGRATE' && existingItems.size > 0) {
diff --git a/packages/adf/src/index.ts b/packages/adf/src/index.ts
index 9824ef4..2856de6 100644
--- a/packages/adf/src/index.ts
+++ b/packages/adf/src/index.ts
@@ -6,7 +6,7 @@ export { validateConstraints, computeWeightSummary } from './validator';
 export { evaluateEvidence } from './evidence';
 export type { EvidenceReport, StaleBaselineWarning } from './evidence';
 export { parseMarkdownSections } from './markdown-parser';
-export type { MarkdownSection, MarkdownElement, RuleStrength } from './markdown-parser';
+export type { MarkdownSection, MarkdownElement, RuleStrength, StrengthConfig } from './markdown-parser';
 export { classifyElement, isDuplicateItem, buildMigrationPlan } from './content-classifier';
 export type {
   ClassificationResult,
@@ -16,6 +16,7 @@ export type {
   AdfTargetSection,
   WeightTag,
   TriggerMap,
+  ClassifierConfig,
 } from './content-classifier';
 export * from './types';
 export * from './errors';
diff --git a/packages/adf/src/markdown-parser.ts b/packages/adf/src/markdown-parser.ts
index 202ec19..3089109 100644
--- a/packages/adf/src/markdown-parser.ts
+++ b/packages/adf/src/markdown-parser.ts
@@ -29,11 +29,17 @@ export interface MarkdownSection {
   elements: MarkdownElement[];
 }
 
+/** Optional overrides for rule-strength detection patterns. */
+export interface StrengthConfig {
+  imperativePatterns?: RegExp[];
+  advisoryPatterns?: RegExp[];
+}
+
 // ============================================================================
 // Strength Detection
 // ============================================================================
 
-const IMPERATIVE_PATTERNS = [
+const IMPERATIVE_PATTERNS: RegExp[] = [
   /\bNEVER\b/,
   /\bALWAYS\b/,
   /\bMUST\b/,
@@ -43,7 +49,7 @@ const IMPERATIVE_PATTERNS = [
   /\bREQUIRE[DS]?\b/,
 ];
 
-const ADVISORY_PATTERNS = [
+const ADVISORY_PATTERNS: RegExp[] = [
   /\bprefer\b/i,
   /\bshould\b/i,
   /\bbias\b/i,
@@ -53,11 +59,13 @@ const ADVISORY_PATTERNS = [
   /\btry to\b/i,
 ];
 
-function detectStrength(text: string): RuleStrength {
-  for (const p of IMPERATIVE_PATTERNS) {
+function detectStrength(text: string, config?: StrengthConfig): RuleStrength {
+  const imp = config?.imperativePatterns ?? IMPERATIVE_PATTERNS;
+  const adv = config?.advisoryPatterns ?? ADVISORY_PATTERNS;
+  for (const p of imp) {
     if (p.test(text)) return 'imperative';
   }
-  for (const p of ADVISORY_PATTERNS) {
+  for (const p of adv) {
     if (p.test(text)) return 'advisory';
   }
   return 'neutral';
@@ -74,7 +82,7 @@ function detectStrength(text: string): RuleStrength {
  * "preamble" section with heading "". Within each section, sub-elements
  * are classified as rules, code blocks, table rows, or prose.
  */
-export function parseMarkdownSections(input: string): MarkdownSection[] {
+export function parseMarkdownSections(input: string, config?: StrengthConfig): MarkdownSection[] {
   const lines = input.split('\n');
   const sections: MarkdownSection[] = [];
 
@@ -149,7 +157,7 @@ export function parseMarkdownSections(input: string): MarkdownSection[] {
       currentElements.push({
         type: 'rule',
         content: ruleText,
-        strength: detectStrength(ruleText),
+        strength: detectStrength(ruleText, config),
       });
       continue;
     }