diff --git a/assets/js/ai-tools.js b/assets/js/ai-tools.js
index 0b27b8b..7b1ee61 100644
--- a/assets/js/ai-tools.js
+++ b/assets/js/ai-tools.js
@@ -16,12 +16,12 @@
     var CLAUDE_CODE_REPOSITORY = "nm-Team/Support";
     var CLAUDE_CODE_BRANCH = "main";
 
-    function mdUrl(raw) {
-        var path = raw ? "/" + raw : "/index.md";
-        if (/\/$/.test(path)) {
-            path += "index.md";
-        }
-        return new URL(path, location.href).href;
+    // The page's own Markdown copy sits at its docs-relative source path.
+    // Anything that resolves away from this origin (a tampered data attribute,
+    // say) is refused instead of being opened or fetched.
+    function mdUrl(sourcePath) {
+        var url = new URL("/" + sourcePath.replace(/^\/+/, ""), location.href);
+        return url.origin === location.origin ? url : null;
     }
 
     function providerPrompt(url) {
@@ -106,6 +106,9 @@
     }
 
     function loadMarkdown(md) {
+        if (!md) {
+            return Promise.resolve(null);
+        }
         return fetch(md)
             .then(function (response) {
                 var contentType = response.headers.get("Content-Type") || "";
@@ -146,40 +149,29 @@
         });
     }
 
-    function wireMarkdown(link, md) {
-        var availability;
-
-        function checkAvailability() {
-            if (!availability) {
-                availability = fetch(md, { method: "HEAD" })
-                    .then(function (response) {
-                        var contentType = response.headers.get("Content-Type") || "";
-                        return response.ok && contentType.indexOf("html") === -1;
-                    })
-                    .catch(function () {
-                        return false;
-                    });
-            }
-            return availability;
+    // Whether the Markdown copy is really served next to the rendered page.
+    function markdownAvailability(md) {
+        if (!md) {
+            return Promise.resolve(false);
         }
+        return fetch(md, { method: "HEAD" })
+            .then(function (response) {
+                var contentType = response.headers.get("Content-Type") || "";
+                return response.ok && contentType.indexOf("html") === -1;
+            })
+            .catch(function () {
+                return false;
+            });
+    }
 
+    function wireMarkdown(link, md, isAvailable) {
         link.href = md;
         link.addEventListener("click", function (event) {
-            event.preventDefault();
-            var target = window.open("about:blank", "_blank");
-            if (target) {
-                target.opener = null;
+            if (isAvailable()) {
+                return;
             }
-            checkAvailability().then(function (available) {
-                if (available && target) {
-                    target.location.replace(md);
-                    return;
-                }
-                if (target) {
-                    target.close();
-                }
-                showMarkdownUnavailable();
-            });
+            event.preventDefault();
+            showMarkdownUnavailable();
         });
     }
 
@@ -187,13 +179,20 @@
         var trigger = box.querySelector(".ai-tools__trigger");
         var copy = box.querySelector(".ai-tools__copy");
         var menu = box.querySelector(".ai-tools__menu");
-        var raw = box.getAttribute("data-md-url") || "";
+        var sourcePath = box.getAttribute("data-md-path") || "";
         var markdown = menu.querySelector('[data-ai="markdown"]');
-        var md = mdUrl(raw);
-        var prompt = providerPrompt(md);
+        var md = mdUrl(sourcePath);
+        var mdHref = md ? md.href : "";
+        var markdownAvailable = false;
+        var prompt = providerPrompt(mdHref);
 
-        wireCopy(copy, md);
-        wireMarkdown(markdown, md);
+        markdownAvailability(mdHref).then(function (available) {
+            markdownAvailable = available;
+        });
+        wireCopy(copy, mdHref);
+        wireMarkdown(markdown, mdHref, function () {
+            return markdownAvailable;
+        });
         [
             "perplexity",
             "grok",
diff --git a/overrides/partials/actions.html b/overrides/partials/actions.html
index 2ea64dc..e5ad9f2 100644
--- a/overrides/partials/actions.html
+++ b/overrides/partials/actions.html
@@ -41,7 +41,7 @@
   {% set source_url = "https://github.com/nm-Team/Support/blob/main/docs/" ~ page.file.src_uri %}
   <div
     class="ai-tools"
-    data-md-url="{{ page.file.src_uri }}"
+    data-md-path="{{ page.file.src_uri }}"
     data-page-title="{{ page.title | e }}"
   >
     <button class="ai-tools__copy" type="button">
diff --git a/src/nmteam_support/plugin.py b/src/nmteam_support/plugin.py
index 20a897a..ef7caee 100644
--- a/src/nmteam_support/plugin.py
+++ b/src/nmteam_support/plugin.py
@@ -167,18 +167,28 @@ def _write_markdown_copies(
     entries: dict[str, DocEntry],
     config: MkDocsConfig,
 ) -> None:
-    site_dir = Path(config.site_dir)
+    """Write one Markdown copy per rendered page, at its docs-relative path.
+
+    Every page the site renders gets a copy so the article actions can point at
+    ``page.file.src_uri`` without any URL-to-file guessing.
+    """
+    copies = {
+        path: render_index_page(directory)
+        for path, directory in directories.items()
+        if path in catalog.pages or is_renderable(directory)
+    }
     for path, source in catalog.pages.items():
-        directory = directories.get(path)
-        if directory is not None:
-            content = render_index_page(directory)
-        else:
-            entry = entries[path]
-            content = (
-                source.text
-                if should_hide_contributing_note(entry)
-                else render_doc_file(source.text, path)
-            )
+        if path in directories:
+            continue
+        entry = entries[path]
+        copies[path] = (
+            source.text
+            if should_hide_contributing_note(entry)
+            else render_doc_file(source.text, path)
+        )
+
+    site_dir = Path(config.site_dir)
+    for path, content in copies.items():
         target = site_dir / path
         target.parent.mkdir(parents=True, exist_ok=True)
-        target.write_text(content, encoding="utf-8")
+        target.write_text(content, encoding="utf-8", newline="\n")
diff --git a/tests/test_lifecycle.py b/tests/test_lifecycle.py
index e0be71c..9142130 100644
--- a/tests/test_lifecycle.py
+++ b/tests/test_lifecycle.py
@@ -1,8 +1,29 @@
 """Real production lifecycle integration tests."""
 
 import json
+import threading
+import urllib.request
+from html.parser import HTMLParser
+from pathlib import Path
 
 from nmteam_support.cli import build_site
+from nmteam_support.serve import create_server
+
+REPO_ROOT = Path(__file__).resolve().parents[1]
+
+
+class _ArticleActions(HTMLParser):
+    """Collect the Markdown paths advertised by a rendered page."""
+
+    def __init__(self) -> None:
+        super().__init__()
+        self.md_paths: list[str] = []
+
+    def handle_starttag(self, tag: str, attrs: list[tuple[str, str | None]]) -> None:
+        attributes = dict(attrs)
+        classes = (attributes.get("class") or "").split()
+        if tag == "div" and "ai-tools" in classes and attributes.get("data-md-path"):
+            self.md_paths.append(str(attributes["data-md-path"]))
 
 
 def test_build_reads_docs_directly_and_writes_only_final_outputs(tmp_path, docs_dir):
@@ -41,3 +62,60 @@ def test_build_reads_docs_directly_and_writes_only_final_outputs(tmp_path, docs_
     assert "帮助我们改进此文档" in (site / "nmbot-telegram" / "mcp.md").read_text(encoding="utf-8")
     assert not (tmp_path / "cache").exists()
     assert not (tmp_path / "generated").exists()
+
+
+def test_every_rendered_page_advertises_a_served_markdown_copy(tmp_path, docs_dir):
+    config = tmp_path / "mkdocs.yml"
+    config.write_text(
+        "site_name: Test\n"
+        "site_url: https://docs.example.test\n"
+        "strict: true\n"
+        "docs_dir: docs\n"
+        "site_dir: site\n"
+        "theme:\n"
+        "  name: material\n"
+        f"  custom_dir: {REPO_ROOT / 'overrides'}\n"
+        "plugins:\n"
+        "  - nmteam-support\n",
+        encoding="utf-8",
+    )
+
+    build_site(config)
+
+    site = tmp_path / "site"
+    advertised: dict[str, list[str]] = {}
+    for page in sorted(site.rglob("*.html")):
+        if page.name == "404.html":
+            continue
+        parser = _ArticleActions()
+        parser.feed(page.read_text(encoding="utf-8"))
+        advertised[page.relative_to(site).as_posix()] = parser.md_paths
+
+    # The home page hides the actions on purpose; every other page advertises one copy.
+    assert advertised.pop("index.html") == []
+    assert set(advertised) == {
+        "about/index.html",
+        "contact-us/forum/index.html",
+        "contact-us/index.html",
+        "nmbot-telegram/index.html",
+        "nmbot-telegram/mcp/index.html",
+    }
+    assert advertised["nmbot-telegram/index.html"] == ["nmbot-telegram/index.md"]
+
+    server = create_server(site, port=0)
+    thread = threading.Thread(target=server.serve_forever, daemon=True)
+    thread.start()
+    try:
+        host, port = server.server_address[0], server.server_address[1]
+        for page, paths in advertised.items():
+            assert len(paths) == 1, page
+            with urllib.request.urlopen(f"http://{host}:{port}/{paths[0]}", timeout=5) as response:
+                assert response.status == 200, page
+                assert response.headers.get_content_type() == "text/plain", page
+                served = response.read().decode("utf-8")
+            assert served == (site / paths[0]).read_text(encoding="utf-8"), page
+            # Build output stays byte-identical across platforms, so copies use LF.
+            assert b"\r" not in (site / paths[0]).read_bytes(), page
+    finally:
+        server.shutdown()
+        server.server_close()