diff --git a/skills/frontend-design-direction/SKILL.md b/skills/frontend-design-direction/SKILL.md
index 77a3b4a10..6e850835c 100644
--- a/skills/frontend-design-direction/SKILL.md
+++ b/skills/frontend-design-direction/SKILL.md
@@ -133,6 +133,9 @@ node <installed-skill>/scripts/check-evidence.js <local-report.json>
 The record contains:
 
 - `contract`: the checkable product constraints or a local contract reference.
+- `targetViewports`: a nonempty array of viewport strings from the contract,
+  such as `["390x844", "1440x900"]`. Each target requires a matching `viewport`
+  entry in `renderedEvidence`; one mobile capture cannot cover a desktop target.
 - `accessibility` and `responsive`: objects with `status: "pass"` and a nonempty
   `evidence` observation describing the checks performed.
 - `contentStates`: one object for each of `loading`, `empty`, `error`, `partial`,
diff --git a/skills/frontend-design-direction/scripts/check-evidence.js b/skills/frontend-design-direction/scripts/check-evidence.js
index db18a84f1..c15c963e8 100644
--- a/skills/frontend-design-direction/scripts/check-evidence.js
+++ b/skills/frontend-design-direction/scripts/check-evidence.js
@@ -17,8 +17,12 @@ function checkEvidence(report) {
     return [`${name} needs a passing observation${allowNotApplicable ? ' or a not-applicable reason' : ''}`];
   };
   const renders = Array.isArray(report.renderedEvidence) ? report.renderedEvidence : [];
+  const targets = Array.isArray(report.targetViewports) ? report.targetViewports : [];
   return [
     ...(text(report.contract) ? [] : ['contract is required']),
+    ...(targets.length && targets.every(text) ? [] : ['targetViewports must contain nonempty viewport strings']),
+    ...targets.filter(text).flatMap(viewport => renders.some(item => object(item) && item.viewport === viewport)
+      ? [] : [`renderedEvidence is missing target viewport ${viewport}`]),
     ...check('accessibility', report.accessibility),
     ...check('responsive', report.responsive),
     ...states.flatMap(state => check(`contentStates.${state}`, report.contentStates?.[state], true)),
diff --git a/tests/skills/frontend-design-direction.test.js b/tests/skills/frontend-design-direction.test.js
index b1045af5e..f9f3daffb 100644
--- a/tests/skills/frontend-design-direction.test.js
+++ b/tests/skills/frontend-design-direction.test.js
@@ -13,6 +13,7 @@ function report() {
   const observation = { status: 'pass', evidence: 'Observed in the local test run.' };
   return {
     contract: 'Settings: account owner can save changes and recover from failure.',
+    targetViewports: ['390x844'],
     accessibility: { ...observation },
     responsive: { ...observation },
     contentStates: Object.fromEntries(['loading', 'empty', 'error', 'partial', 'success', 'permission']
@@ -24,7 +25,7 @@ function report() {
 test('requires observed accessibility, responsive behavior and every content state', () => {
   const evidence = report();
   assert.deepEqual(checkEvidence(evidence), []);
-  for (const key of ['contract', 'accessibility', 'responsive', 'contentStates', 'renderedEvidence']) {
+  for (const key of ['contract', 'targetViewports', 'accessibility', 'responsive', 'contentStates', 'renderedEvidence']) {
     const missing = { ...evidence };
     delete missing[key];
     assert.ok(checkEvidence(missing).length, `accepted missing ${key}`);
@@ -40,6 +41,16 @@ test('requires observed accessibility, responsive behavior and every content sta
   assert.ok(checkEvidence({ ...evidence, responsive: { status: 'pass', evidence: ' ' } }).length);
 });
 
+test('requires rendered evidence for every declared target viewport', () => {
+  const evidence = { ...report(), targetViewports: ['390x844', '1440x900'] };
+  assert.ok(checkEvidence(evidence).length, 'mobile alone must not satisfy a desktop target');
+  const desktop = { viewport: '1440x900', artifact: 'desktop.png', observation: 'Long labels fit.' };
+  assert.deepEqual(checkEvidence({ ...evidence, renderedEvidence: [...evidence.renderedEvidence, desktop] }), []);
+  for (const targetViewports of [[], '390x844', [' '], [null], ['390x844', 1440]]) {
+    assert.ok(checkEvidence({ ...report(), targetViewports }).length, 'invalid targets must fail');
+  }
+});
+
 test('only content states may be not applicable with a reason', () => {
   const evidence = report();
   const contentStates = { ...evidence.contentStates, permission: { status: 'not-applicable', reason: 'Public view without restricted actions.' } };
@@ -57,6 +68,7 @@ test('rejects malformed reports and rendered evidence without inspection details
 
 test('CLI requires a nonempty local artifact and fails safely on invalid input', () => {
   const dir = fs.mkdtempSync(path.join(os.tmpdir(), 'ecc-ui-evidence-'));
+  const external = fs.mkdtempSync(path.join(os.tmpdir(), 'ecc-ui-external-'));
   const input = path.join(dir, 'report.json');
   const run = (...args) => spawnSync(process.execPath, [script, ...args], { encoding: 'utf8' });
   try {
@@ -66,10 +78,13 @@ test('CLI requires a nonempty local artifact and fails safely on invalid input',
     assert.equal(run(input).status, 0);
     fs.writeFileSync(path.join(dir, 'render.png'), '');
     assert.equal(run(input).status, 1, 'empty artifact must fail');
+    fs.writeFileSync(path.join(dir, 'render.png'), 'nonempty local artifact');
+    fs.writeFileSync(path.join(external, 'render.png'), 'nonempty external artifact');
     fs.symlinkSync(path.join(dir, 'render.png'), path.join(dir, 'linked.png'));
-    fs.symlinkSync(os.tmpdir(), path.join(dir, 'outside'));
+    fs.symlinkSync(path.join(external, 'render.png'), path.join(dir, 'outside'));
+    fs.symlinkSync(external, path.join(dir, 'external-dir'), 'junction');
     for (const artifact of ['.', 'https://example.com/render.png', path.join(dir, 'render.png'),
-      '../render.png', 'C:\\render.png', 'linked.png', 'outside']) {
+      '../render.png', 'C:\\render.png', 'linked.png', 'outside', 'external-dir/render.png']) {
       fs.writeFileSync(input, JSON.stringify({ ...report(), renderedEvidence: [{ viewport: '390x844', artifact, observation: 'Checked.' }] }));
       assert.equal(run(input).status, 1, 'directories and remote artifacts must fail');
     }
@@ -82,5 +97,6 @@ test('CLI requires a nonempty local artifact and fails safely on invalid input',
     assert.equal(run().status, 1);
   } finally {
     fs.rmSync(dir, { recursive: true, force: true });
+    fs.rmSync(external, { recursive: true, force: true });
   }
 });