diff --git a/packages/mcp/package.json b/packages/mcp/package.json
index 190d885..6f032bd 100644
--- a/packages/mcp/package.json
+++ b/packages/mcp/package.json
@@ -59,7 +59,8 @@
   "scripts": {
     "postinstall": "node scripts/postinstall.js",
     "start": "node src/index.js",
-    "test": "node --test test/*.test.js"
+    "test": "node --test test/*.test.js",
+    "test:live": "LIVE=1 node --test test/live.test.js"
   },
   "license": "MIT",
   "publishConfig": {
diff --git a/packages/mcp/test/live.test.js b/packages/mcp/test/live.test.js
new file mode 100644
index 0000000..d8523bc
--- /dev/null
+++ b/packages/mcp/test/live.test.js
@@ -0,0 +1,81 @@
+import test from 'node:test'
+import assert from 'node:assert/strict'
+
+import { z } from 'zod'
+
+import { tools } from '../src/tools/index.js'
+
+// Opt-in live conformance tests: invoke real tools against the free Microlink
+// endpoint and validate structuredContent against each tool's declared
+// outputSchema. They catch contract drift between the schemas and the real
+// API that unit tests with stubbed responses cannot.
+//
+// Run with: LIVE=1 pnpm test  (or: pnpm test:live)
+// Without LIVE=1 every test in this file is skipped, so CI is unaffected.
+const LIVE = process.env.LIVE === '1'
+const run = { skip: !LIVE, timeout: 120000 }
+
+const configs = {}
+const handlers = {}
+tools({
+  registerTool: (name, config, handler) => {
+    configs[name] = config
+    handlers[name] = handler
+  }
+})
+
+async function invoke (name, args) {
+  const res = await handlers[name](args, {})
+  assert.equal(res.isError, false, `${name} failed: ${res.content?.[0]?.text}`)
+  const schema = z.object(configs[name].outputSchema)
+  const parsed = schema.safeParse(res.structuredContent)
+  assert.ok(parsed.success, `${name}: ${parsed.error?.message}`)
+  return res.structuredContent.data
+}
+
+test('live: metadata matches its output schema', run, async () => {
+  const data = await invoke('microlink_metadata', {
+    url: 'https://example.com'
+  })
+  assert.equal(typeof data, 'object')
+})
+
+test('live: markdown matches its output schema', run, async () => {
+  await invoke('microlink_markdown', { url: 'https://example.com' })
+})
+
+test('live: logo matches its output schema (asset or null)', run, async () => {
+  await invoke('microlink_logo', { url: 'https://github.com' })
+})
+
+test('live: links matches its output schema', run, async () => {
+  const data = await invoke('microlink_links', { url: 'https://example.com' })
+  assert.ok(Array.isArray(data))
+})
+
+test('live: screenshot matches its output schema', run, async () => {
+  const data = await invoke('microlink_screenshot', {
+    url: 'https://example.com'
+  })
+  assert.equal(typeof data.url, 'string')
+})
+
+test('live: embed matches its output schema (embed or null)', run, async () => {
+  await invoke('microlink_embed', {
+    url: 'https://www.youtube.com/watch?v=aqz-KE-bpKQ'
+  })
+})
+
+test('live: technologies matches its output schema', run, async () => {
+  const data = await invoke('microlink_technologies', {
+    url: 'https://example.com'
+  })
+  assert.ok(Array.isArray(data))
+})
+
+test('live: extract matches its output schema', run, async () => {
+  await invoke('microlink_extract', {
+    url: 'https://example.com',
+    data: { title: { selector: 'h1' } }
+  })
+})