diff --git a/boot.py b/boot.py
index 7c07c7455..17ef443f9 100644
--- a/boot.py
+++ b/boot.py
@@ -56,6 +56,7 @@
 from .plugin.hierarchy import LspCallHierarchyCommand
 from .plugin.hierarchy import LspHierarchyToggleCommand
 from .plugin.hierarchy import LspTypeHierarchyCommand
+from .plugin.hover import LspCopyTextCommand
 from .plugin.hover import LspHoverCommand
 from .plugin.hover import LspToggleHoverPopupsCommand
 from .plugin.inlay_hint import LspInlayHintClickCommand
@@ -100,6 +101,7 @@
     "LspCollapseTreeItemCommand",
     "LspColorPresentationCommand",
     "LspCommitCompletionWithOppositeInsertMode",
+    "LspCopyTextCommand",
     "LspCopyToClipboardFromBase64Command",
     "LspDisableLanguageServerGloballyCommand",
     "LspDisableLanguageServerInProjectCommand",
diff --git a/plugin/completion.py b/plugin/completion.py
index 18e26e732..c254e5a52 100644
--- a/plugin/completion.py
+++ b/plugin/completion.py
@@ -331,8 +331,11 @@ def _format_documentation(
     ) -> str:
         return minihtml(self.view, content, FORMAT_STRING | FORMAT_MARKUP_CONTENT, language_map)
 
-    def _on_navigate(self, url: str) -> None:
-        webbrowser.open(url)
+    def _on_navigate(self, href: str) -> None:
+        if href.startswith("http"):
+            webbrowser.open(href)
+            return
+        debug('on_navigate unhandled href:', href)
 
 
 class LspCommitCompletionWithOppositeInsertMode(LspTextCommand):
diff --git a/plugin/core/views.py b/plugin/core/views.py
index a2ba5c6d6..e47f8c5d5 100644
--- a/plugin/core/views.py
+++ b/plugin/core/views.py
@@ -831,6 +831,10 @@ def format_diagnostic_for_html(config: ClientConfig, diagnostic: Diagnostic, bas
             meta_info += "({})".format(
                 make_link(code_description["href"], str(code)) if code_description else text2html(str(code)))
         html += " " + _html_element("span", meta_info, class_name="color-muted", escape=False)
+    copy_text = f"{diagnostic['message']} {f'({source})' if source else ''}".strip().replace(' ', ' ')
+    html += f"""<a class='copy-icon' title='Copy to clipboard' href='{sublime.command_url(
+        'lsp_copy_text', {'text': copy_text}
+    )}'>⧉</a>"""
     if related_infos := diagnostic.get("relatedInformation"):
         info = "<br>".join(_format_diagnostic_related_info(config, info, base_dir) for info in related_infos)
         html += '<br>' + _html_element("pre", info, class_name="related_info", escape=False)
diff --git a/plugin/documents.py b/plugin/documents.py
index d0b5333e4..fd1a2fea4 100644
--- a/plugin/documents.py
+++ b/plugin/documents.py
@@ -717,7 +717,10 @@ def _on_sighelp_hide(self) -> None:
         self._sighelp = None
 
     def _on_sighelp_navigate(self, href: str) -> None:
-        webbrowser.open_new_tab(href)
+        if href.startswith("http"):
+            webbrowser.open_new_tab(href)
+            return
+        debug('on_sighelp_navigate unhandled href:', href)
 
     # --- textDocument/codeAction --------------------------------------------------------------------------------------
 
@@ -786,8 +789,10 @@ def _on_navigate(self, href: str, point: int) -> None:
                         placeholder="Code actions")
             else:
                 self.handle_code_action_select(config_name, actions, 0)
-        else:
+        elif href.startswith("http"):
             open_in_browser(href)
+        else:
+            debug('on_navigate unhandled href:', href)
 
     def handle_code_action_select(self, config_name: str, actions: list[CodeActionOrCommand], index: int) -> None:
         if index == -1:
diff --git a/plugin/hover.py b/plugin/hover.py
index 29ad0b136..514d4df5d 100644
--- a/plugin/hover.py
+++ b/plugin/hover.py
@@ -258,7 +258,7 @@ def diagnostics_content(self) -> str:
         return "".join(formatted)
 
     def hover_content(self) -> str:
-        contents = []
+        contents: list[str] = []
         for hover, language_map in self._hover_responses:
             content = (hover.get('contents') or '') if isinstance(hover, dict) else ''
             allowed_formats = FORMAT_MARKED_STRING | FORMAT_MARKUP_CONTENT
@@ -409,3 +409,10 @@ def _update_views_async(self, enable: bool) -> None:
                         session_view.view.settings().set(SHOW_DEFINITIONS_KEY, False)
                     else:
                         session_view.reset_show_definitions()
+
+
+class LspCopyTextCommand(sublime_plugin.WindowCommand):
+    def run(self, text: str) -> None:
+        sublime.set_clipboard(text)
+        text_length = len(text)
+        self.window.status_message(f"Copied {text_length} characters")
diff --git a/popups.css b/popups.css
index 1c761e9d9..118d11344 100644
--- a/popups.css
+++ b/popups.css
@@ -86,3 +86,8 @@ pre.related_info {
     margin-top: 0.7rem;
     padding-top: 0.7rem;
 }
+a.copy-icon {
+    padding: 0.5rem;
+    text-decoration: none;
+    color: color(var(--foreground) alpha(0.6));
+}