diff --git a/hooks/scripts/__tests__/user-prompt-context.test.mjs b/hooks/scripts/__tests__/user-prompt-context.test.mjs
new file mode 100644
index 0000000..43ebff5
--- /dev/null
+++ b/hooks/scripts/__tests__/user-prompt-context.test.mjs
@@ -0,0 +1,65 @@
+import { describe, test, afterEach } from 'node:test';
+import assert from 'node:assert/strict';
+import { execFileSync } from 'node:child_process';
+import { mkdtempSync, rmSync, mkdirSync, writeFileSync, existsSync } from 'node:fs';
+import { join, dirname } from 'node:path';
+import { tmpdir } from 'node:os';
+import { fileURLToPath } from 'node:url';
+
+// M0-8 / SC7: the UserPromptSubmit hook must point the voice-profile hint at the
+// REAL artefact in the EXTERNAL data root (getDataRoot('voice-samples')), not the
+// in-plugin placeholder. This hook is a procedural stdin->stdout CLI with no
+// exports, so we test it end-to-end as a subprocess: pipe the prompt JSON, stub
+// LINKEDIN_STUDIO_DATA + STATE_FILE, and inspect the injected systemMessage.
+const hookPath = join(dirname(fileURLToPath(import.meta.url)), '..', 'user-prompt-context.mjs');
+
+function runHook(prompt, env) {
+  const out = execFileSync('node', [hookPath], {
+    input: JSON.stringify({ prompt }),
+    env: { ...process.env, ...env },
+    encoding: 'utf-8',
+  });
+  return JSON.parse(out);
+}
+
+describe('user-prompt-context — voice hint points at external data root (M0-8/SC7)', () => {
+  let dataDir;
+
+  afterEach(() => {
+    if (dataDir && existsSync(dataDir)) rmSync(dataDir, { recursive: true, force: true });
+    dataDir = undefined;
+  });
+
+  test('real external voice present → systemMessage references the external voice file', () => {
+    dataDir = mkdtempSync(join(tmpdir(), 'lis-upc-'));
+    mkdirSync(join(dataDir, 'voice-samples'), { recursive: true });
+    writeFileSync(join(dataDir, 'voice-samples', 'authentic-voice-samples.md'), '# My Voice\n\nreal content\n', 'utf-8');
+
+    const result = runHook('write a linkedin post', {
+      LINKEDIN_STUDIO_DATA: dataDir,
+      STATE_FILE: join(dataDir, 'no-state.local.md'),
+    });
+
+    assert.ok(result.systemMessage, 'a LinkedIn prompt must produce an enrichment systemMessage');
+    assert.ok(
+      result.systemMessage.includes(join(dataDir, 'voice-samples', 'authentic-voice-samples.md')),
+      'voice hint must point at the external voice file, not the in-plugin placeholder',
+    );
+  });
+
+  test('external voice absent → no voice-profile hint injected (graceful degradation)', () => {
+    dataDir = mkdtempSync(join(tmpdir(), 'lis-upc-'));
+    // no voice-samples dir/file seeded under the external root
+
+    const result = runHook('write a linkedin post', {
+      LINKEDIN_STUDIO_DATA: dataDir,
+      STATE_FILE: join(dataDir, 'no-state.local.md'),
+    });
+
+    assert.ok(result.systemMessage, 'still enriches (scorecard reminder), just without the voice hint');
+    assert.ok(
+      !result.systemMessage.includes('Voice Profile:'),
+      'no voice hint when the external voice artefact is absent',
+    );
+  });
+});
diff --git a/hooks/scripts/user-prompt-context.mjs b/hooks/scripts/user-prompt-context.mjs
index 66938a4..b47d8d7 100644
--- a/hooks/scripts/user-prompt-context.mjs
+++ b/hooks/scripts/user-prompt-context.mjs
@@ -13,13 +13,10 @@
 //   0 - Always allow (informational hook)
 
 import { readFileSync, existsSync } from 'node:fs';
-import { join, dirname } from 'node:path';
-import { fileURLToPath } from 'node:url';
+import { join } from 'node:path';
+import { getDataRoot, getStateFile } from './data-root.mjs';
 
-const __dirname = dirname(fileURLToPath(import.meta.url));
-const pluginRoot = join(__dirname, '..', '..');
-const home = process.env.HOME || process.env.USERPROFILE || '';
-const stateFile = join(home, '.claude', 'linkedin-studio.local.md');
+const stateFile = getStateFile();
 
 // Read stdin JSON
 let input;
@@ -98,10 +95,10 @@ if (!isLinkedin) {
 // === Build context enrichment ===
 let context = '**LinkedIn Context Enrichment (auto-injected):**\n\n';
 
-// 1. Voice profile reference
-const voiceFile = join(pluginRoot, 'assets', 'voice-samples', 'authentic-voice-samples.md');
+// 1. Voice profile reference — the REAL artefact in the external data root (SC7).
+const voiceFile = join(getDataRoot('voice-samples'), 'authentic-voice-samples.md');
 if (existsSync(voiceFile)) {
-  context += '**Voice Profile:** Read `assets/voice-samples/authentic-voice-samples.md` for tone matching.\n\n';
+  context += `**Voice Profile:** Read \`${voiceFile}\` for tone matching.\n\n`;
 }
 
 // 2-4. State file data