diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index e24c0dd7..8a0a8738 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -33,6 +33,9 @@ jobs:
       - uses: actions/setup-python@v5
         with:
           python-version: '3.11'
+      - uses: actions/setup-node@v6
+        with:
+          node-version: '20'
       - run: python docs_check.py
 
   deploy:
diff --git a/docs/changelog.md b/docs/changelog.md
index 8a861dad..a125a2d0 100644
--- a/docs/changelog.md
+++ b/docs/changelog.md
@@ -3,9 +3,7 @@ title: "Changelog"
 description: "Release history for Semantica. All notable changes by version."
 ---
 
-<Note>
-  The latest stable release is **v0.5.0**. Changes listed under **Unreleased** are merged to `main` but not yet published to PyPI.
-</Note>
+The latest stable release is **v0.5.0**. Changes listed under **Unreleased** are merged to `main` but not yet published to PyPI.
 
 ---
 
diff --git a/docs_check.py b/docs_check.py
index eb24daa1..5989cfe8 100644
--- a/docs_check.py
+++ b/docs_check.py
@@ -5,6 +5,7 @@ import glob
 import json
 import os
 import re
+import subprocess
 import sys
 from typing import Any, Callable, cast
 
@@ -195,6 +196,72 @@ def _() -> list[str]:
     return [m for m in modules if m not in index]
 
 
+# ── 9. JSX component tags are balanced in every page ─────────────────────────
+@check("All Mintlify JSX component tags are balanced")
+def _() -> list[str]:
+    # Paired block-level components that must open and close.
+    COMPONENTS = [
+        "AccordionGroup", "Accordion", "Steps", "Step",
+        "CodeGroup", "Tabs", "Tab", "CardGroup", "Card",
+        "Expandable",
+    ]
+    issues: list[str] = []
+    for fpath in ALL_MD:
+        content = read(fpath)
+        lines = content.splitlines()
+        for comp in COMPONENTS:
+            # Count opening and closing tags (ignore self-closing <Comp />)
+            opens = len(re.findall(rf"<{comp}[\s>]", content))
+            closes = len(re.findall(rf"</{comp}>", content))
+            if opens != closes:
+                issues.append(
+                    f"{fpath}: <{comp}> opened {opens}x but closed {closes}x"
+                )
+        # Check code fences are balanced (odd fence count = unclosed block)
+        fence_count = sum(
+            1 for ln in lines if ln.strip().startswith("```")
+        )
+        if fence_count % 2 != 0:
+            issues.append(f"{fpath}: odd number of ``` fences — unclosed code block")
+    return issues
+
+
+# ── 10. Mintlify export succeeds (requires Node.js / npx) ────────────────────
+@check("Mintlify export builds without errors")
+def _() -> list[str]:
+    npx = "npx.cmd" if sys.platform == "win32" else "npx"
+    try:
+        result = subprocess.run(
+            [npx, "--yes", "mintlify@4.2.632", "export", "--output", "export_ci_check.zip"],
+            cwd=DOCS,
+            capture_output=True,
+            text=True,
+            timeout=300,
+        )
+        # Clean up zip regardless of outcome
+        zip_path = os.path.join(DOCS, "export_ci_check.zip")
+        if os.path.exists(zip_path):
+            os.remove(zip_path)
+
+        combined = (result.stdout or "") + (result.stderr or "")
+
+        if result.returncode != 0:
+            # On Windows, npm cleanup raises EPERM on temp dirs — not a real
+            # export failure. Treat as a skip rather than a hard failure.
+            if sys.platform == "win32" and "EPERM" in combined and \
+                    "could not be generated" not in combined:
+                return []  # Windows temp-cleanup noise; real CI runs on Linux
+
+            # Surface the last 20 lines so the failing page error is visible
+            tail = "\n".join(combined.strip().splitlines()[-20:])
+            return [f"mintlify export failed (exit {result.returncode}):\n{tail}"]
+        return []
+    except FileNotFoundError:
+        return ["npx not found — skipping Mintlify export check (Node.js required)"]
+    except subprocess.TimeoutExpired:
+        return ["mintlify export timed out after 300 s"]
+
+
 # ── Summary ───────────────────────────────────────────────────────────────────
 _print_summary(failures)
 if failures: