diff --git a/plugins/grazie/java/src/main/kotlin/com/intellij/grazie/ide/language/java/JavadocProblemFilter.java b/plugins/grazie/java/src/main/kotlin/com/intellij/grazie/ide/language/java/JavadocProblemFilter.java
index fce53727b319..42caf266eb18 100644
--- a/plugins/grazie/java/src/main/kotlin/com/intellij/grazie/ide/language/java/JavadocProblemFilter.java
+++ b/plugins/grazie/java/src/main/kotlin/com/intellij/grazie/ide/language/java/JavadocProblemFilter.java
@@ -1,17 +1,19 @@
 package com.intellij.grazie.ide.language.java;
 
 import com.intellij.grazie.text.ProblemFilter;
-import com.intellij.grazie.text.RuleGroup;
 import com.intellij.grazie.text.TextContent;
 import com.intellij.grazie.text.TextProblem;
-import com.intellij.grazie.utils.Text;
+import com.intellij.grazie.utils.ProblemFilterUtil;
+import com.intellij.psi.javadoc.PsiDocTag;
 import org.jetbrains.annotations.NotNull;
 
 class JavadocProblemFilter extends ProblemFilter {
   @Override
   public boolean shouldIgnore(@NotNull TextProblem problem) {
-    if (problem.getText().getDomain() == TextContent.TextDomain.DOCUMENTATION && Text.isSingleSentence(problem.getText())) {
-      return problem.fitsGroup(RuleGroup.UNDECORATED_SINGLE_SENTENCE);
+    if (problem.getText().getDomain() == TextContent.TextDomain.DOCUMENTATION &&
+        problem.getText().getCommonParent() instanceof PsiDocTag &&
+        (ProblemFilterUtil.isUndecoratedSingleSentenceIssue(problem) || ProblemFilterUtil.isInitialCasingIssue(problem))) {
+      return true;
     }
     return false;
   }
diff --git a/plugins/grazie/src/main/kotlin/com/intellij/grazie/text/ProblemFilter.java b/plugins/grazie/src/main/kotlin/com/intellij/grazie/text/ProblemFilter.java
index a95972887ea5..ca0e46afefd7 100644
--- a/plugins/grazie/src/main/kotlin/com/intellij/grazie/text/ProblemFilter.java
+++ b/plugins/grazie/src/main/kotlin/com/intellij/grazie/text/ProblemFilter.java
@@ -8,9 +8,10 @@ import java.util.stream.Stream;
 /**
  * An extension allowing to prevent some text problems from being reported,
  * registered in {@code plugin.xml} under {@code "com.intellij.grazie.problemFilter"} qualified name.
+ * @see com.intellij.grazie.utils.ProblemFilterUtil
  */
 public abstract class ProblemFilter {
-  private static final LanguageExtension<ProblemFilter> EP = new LanguageExtension<ProblemFilter>("com.intellij.grazie.problemFilter");
+  private static final LanguageExtension<ProblemFilter> EP = new LanguageExtension<>("com.intellij.grazie.problemFilter");
 
   public static Stream<ProblemFilter> allIgnoringFilters(TextProblem problem) {
     return EP.allForLanguageOrAny(problem.getText().getCommonParent().getLanguage()).stream().filter(f -> f.shouldIgnore(problem));
diff --git a/plugins/grazie/src/main/kotlin/com/intellij/grazie/text/RuleGroup.kt b/plugins/grazie/src/main/kotlin/com/intellij/grazie/text/RuleGroup.kt
index 0cf20017c880..b8bd783fbd19 100644
--- a/plugins/grazie/src/main/kotlin/com/intellij/grazie/text/RuleGroup.kt
+++ b/plugins/grazie/src/main/kotlin/com/intellij/grazie/text/RuleGroup.kt
@@ -33,12 +33,15 @@ open class RuleGroup(rules: Set<String>) {
     val EMPTY = RuleGroup()
 
     /** Rules for checking casing errors */
+    @JvmField
     val CASING = RuleGroup(SENTENCE_START_CASE)
 
     /** Rules for checking punctuation errors */
+    @JvmField
     val PUNCTUATION = RuleGroup(SENTENCE_END_PUNCTUATION, UNLIKELY_OPENING_PUNCTUATION)
 
     /** Rules that are usually disabled for literal strings */
+    @JvmField
     val LITERALS = CASING + PUNCTUATION
 
     /**
diff --git a/plugins/grazie/src/main/kotlin/com/intellij/grazie/utils/ProblemFilterUtil.java b/plugins/grazie/src/main/kotlin/com/intellij/grazie/utils/ProblemFilterUtil.java
new file mode 100644
index 000000000000..41a5c8a531c6
--- /dev/null
+++ b/plugins/grazie/src/main/kotlin/com/intellij/grazie/utils/ProblemFilterUtil.java
@@ -0,0 +1,24 @@
+package com.intellij.grazie.utils;
+
+import com.intellij.grazie.text.RuleGroup;
+import com.intellij.grazie.text.TextProblem;
+import com.intellij.util.containers.ContainerUtil;
+
+public final class ProblemFilterUtil {
+
+  /**
+   * Check if this problem reports a letter case issue at the very beginning of the text.
+   * Such issues are often ignored in documentation tags.
+   */
+  public static boolean isInitialCasingIssue(TextProblem problem) {
+    return ContainerUtil.exists(problem.getHighlightRanges(), r -> r.getStartOffset() == 0) && problem.fitsGroup(RuleGroup.CASING);
+  }
+
+  /**
+   * Check if this problem reports a sentence capitalization or missing trailing punctuation issue in a single-sentence text fragment.
+   * Such issues are often ignored in documentation tags or comments.
+   */
+  public static boolean isUndecoratedSingleSentenceIssue(TextProblem problem) {
+    return Text.isSingleSentence(problem.getText()) && problem.fitsGroup(RuleGroup.UNDECORATED_SINGLE_SENTENCE);
+  }
+}
diff --git a/plugins/grazie/src/test/kotlin/com/intellij/grazie/GrazieTestBase.kt b/plugins/grazie/src/test/kotlin/com/intellij/grazie/GrazieTestBase.kt
index fba6932e2905..0c39a5b0e532 100644
--- a/plugins/grazie/src/test/kotlin/com/intellij/grazie/GrazieTestBase.kt
+++ b/plugins/grazie/src/test/kotlin/com/intellij/grazie/GrazieTestBase.kt
@@ -24,7 +24,7 @@ abstract class GrazieTestBase : BasePlatformTestCase() {
   companion object {
     val inspectionTools by lazy { arrayOf(GrazieInspection(), SpellCheckingInspection()) }
     val enabledLanguages = setOf(Lang.AMERICAN_ENGLISH, Lang.GERMANY_GERMAN, Lang.RUSSIAN, Lang.ITALIAN)
-    val enabledRules = setOf("LanguageTool.EN.COMMA_WHICH")
+    val enabledRules = setOf("LanguageTool.EN.COMMA_WHICH", "LanguageTool.EN.UPPERCASE_SENTENCE_START")
   }
 
   protected open val additionalEnabledRules: Set<String> = emptySet()
diff --git a/plugins/grazie/src/test/kotlin/com/intellij/grazie/text/TextExtractionTest.java b/plugins/grazie/src/test/kotlin/com/intellij/grazie/text/TextExtractionTest.java
index 979868bc583e..10f08f3c7dfb 100644
--- a/plugins/grazie/src/test/kotlin/com/intellij/grazie/text/TextExtractionTest.java
+++ b/plugins/grazie/src/test/kotlin/com/intellij/grazie/text/TextExtractionTest.java
@@ -255,7 +255,7 @@ public class TextExtractionTest extends BasePlatformTestCase {
     assertEquals("|characters with markup\nand without it|",
                  unknownOffsets(extractText("a.xml", "<b><![CDATA[\n   characters with markup\n]]>and without it</b>", 22)));
 
-    assertEquals("abcd", unknownOffsets(extractText("a.xml", "<tag attr=\"abcd\"/>", 14)));
+    assertEquals("abcd efg", unknownOffsets(extractText("a.xml", "<tag attr=\"abcd efg\"/>", 14)));
     assertEquals("comment", extractText("a.xml", "<!-- comment -->", 10).toString());
 
     assertEquals("top-level text", unknownOffsets(extractText("a.html", "top-level text", 2)));
diff --git a/plugins/grazie/src/test/testData/ide/language/java/Docs.java b/plugins/grazie/src/test/testData/ide/language/java/Docs.java
index 1b3430ed2cda..703efaa15bb1 100644
--- a/plugins/grazie/src/test/testData/ide/language/java/Docs.java
+++ b/plugins/grazie/src/test/testData/ide/language/java/Docs.java
@@ -10,7 +10,7 @@
  *   Item item = env.generateData(Generator.sampledFrom(sys.currentItems), "working on %s item");
  * </code>
  *
- * @param T the type of member in this group.
+ * @param T the type of member in this group. And another sentence.
  */
 class ExampleClassWithNoTypos<T> {
 
@@ -19,7 +19,7 @@ class ExampleClassWithNoTypos<T> {
     /**
      * Creates an empty group.
      *
-     * @param name The name of the group.
+     * @param name The name of the group. And another sentence.
      */
     public ExampleClassWithNoTypos(String name) {
         this.name = name;
@@ -30,7 +30,7 @@ class ExampleClassWithNoTypos<T> {
      *
      * @param cancellable Whether the progress can be cancelled.
      * @param member member to add
-     * @return the new size of the group.
+     * @return the new size of the group. And another sentence.
      */
     Integer goodFunction(boolean cancellable, T member) {
         return 1; // no error comment
@@ -70,8 +70,8 @@ class ExampleClassWithTypos<T> {
      * It <warning descr="IT_VBZ">add</warning> a [member] to this <TYPO descr="Typo: In word 'grooup'">grooup</TYPO>.
      * <warning descr="UPPERCASE_SENTENCE_START">second</warning> sentence.
      * 
-     * @param member member to add
-     * @return the new size of <warning descr="DT_DT">a the</warning> group.
+     * @param member member to add. And another sentence.
+     * @return the new size of <warning descr="DT_DT">a the</warning> group. <warning descr="UPPERCASE_SENTENCE_START">and</warning> another sentence.
      */
     Integer badFunction(T member) {
         return 1; // It <warning descr="IT_VBZ">are</warning> <TYPO descr="Typo: In word 'eror'">eror</TYPO> in the comment
diff --git a/plugins/grazie/src/test/testData/ide/language/js/Docs.js b/plugins/grazie/src/test/testData/ide/language/js/Docs.js
index 9f546285dfc0..63611194a73d 100644
--- a/plugins/grazie/src/test/testData/ide/language/js/Docs.js
+++ b/plugins/grazie/src/test/testData/ide/language/js/Docs.js
@@ -11,7 +11,7 @@
 class ExampleClassWithNoTypos {
     /**
      * Creates an empty group
-     * @param  {String} name the name of the group
+     * @param  {String} name the name of the group. And another sentence.
      */
     constructor(name) {
         /** @private */
diff --git a/plugins/grazie/src/test/testData/ide/language/xml/Example.html b/plugins/grazie/src/test/testData/ide/language/xml/Example.html
index c4ecced40a30..5d283ea40bd3 100644
--- a/plugins/grazie/src/test/testData/ide/language/xml/Example.html
+++ b/plugins/grazie/src/test/testData/ide/language/xml/Example.html
@@ -6,7 +6,7 @@
 </head>
 <body>
 <H1>Example <TYPO descr="Typo: In word 'hedder'">hedder</TYPO> with <warning descr="EN_A_VS_AN">a</warning> error, so what?</H1>\
-<tag descr="it <warning descr="IT_VBZ">are</warning> error in tag <TYPO descr="Typo: In word 'atributee'">atributee</TYPO>"></tag>
+<tag descr="<warning descr="UPPERCASE_SENTENCE_START">it</warning> <warning descr="IT_VBZ">are</warning> error in tag <TYPO descr="Typo: In word 'atributee'">atributee</TYPO>"></tag>
 
 Some widely used comparison methods (e.g. <code>String.compareTo</code>)
 actually return values.
diff --git a/plugins/grazie/src/test/testData/ide/language/xml/Example.xml b/plugins/grazie/src/test/testData/ide/language/xml/Example.xml
index 9d6b3a8b5ca6..50ccd0b90d16 100644
--- a/plugins/grazie/src/test/testData/ide/language/xml/Example.xml
+++ b/plugins/grazie/src/test/testData/ide/language/xml/Example.xml
@@ -3,7 +3,7 @@
            xsi:noNamespaceSchemaLocation="Example.xsd">
     <orderperson><TYPO descr="Typo: In word 'johnn'">johnn</TYPO> Smith</orderperson>
     <shipto>
-        <name>First sentence. it <warning descr="EN_A_VS_AN">an</warning> friend. Last sentence.</name>
+        <name>First sentence. <warning descr="UPPERCASE_SENTENCE_START">it</warning> <warning descr="EN_A_VS_AN">an</warning> friend. Last sentence.</name>
         <address>Some street 23</address>
     </shipto>
   <russian_with_newline>Не удалось авторизоваться.\nПопробуйте ещё раз. И <warning descr="Sklonenije_NUM_NN">пять карандаша</warning>.</russian_with_newline>
diff --git a/plugins/grazie/xml/main/kotlin/com/intellij/grazie/ide/language/xml/XmlTextExtractor.java b/plugins/grazie/xml/main/kotlin/com/intellij/grazie/ide/language/xml/XmlTextExtractor.java
index dc0ea814cc46..6a7af667f1ad 100644
--- a/plugins/grazie/xml/main/kotlin/com/intellij/grazie/ide/language/xml/XmlTextExtractor.java
+++ b/plugins/grazie/xml/main/kotlin/com/intellij/grazie/ide/language/xml/XmlTextExtractor.java
@@ -68,7 +68,10 @@ public class XmlTextExtractor extends TextExtractor {
     }
 
     if (type == XmlTokenType.XML_ATTRIBUTE_VALUE_TOKEN && allowedDomains.contains(LITERALS) && hasSuitableDialect(element)) {
-      return builder.build(element, LITERALS);
+      TextContent content = builder.build(element, LITERALS);
+      if (content != null && seemsNatural(content)) {
+        return content;
+      }
     }
 
     return null;
@@ -157,6 +160,10 @@ public class XmlTextExtractor extends TextExtractor {
     return visitor.result;
   }
 
+  private static boolean seemsNatural(TextContent content) {
+    return content.toString().contains(" ");
+  }
+
   private static TextContent extractRange(TextContent full, TextRange range) {
     return full.excludeRange(new TextRange(range.getEndOffset(), full.length())).excludeRange(new TextRange(0, range.getStartOffset()));
   }
diff --git a/plugins/kotlin/grazie/src/org/jetbrains/kotlin/idea/grazie/KotlinProblemFilter.kt b/plugins/kotlin/grazie/src/org/jetbrains/kotlin/idea/grazie/KotlinProblemFilter.kt
index fce98a2a5881..675abfc6d2b3 100644
--- a/plugins/kotlin/grazie/src/org/jetbrains/kotlin/idea/grazie/KotlinProblemFilter.kt
+++ b/plugins/kotlin/grazie/src/org/jetbrains/kotlin/idea/grazie/KotlinProblemFilter.kt
@@ -6,6 +6,7 @@ import com.intellij.grazie.text.RuleGroup
 import com.intellij.grazie.text.TextContent.TextDomain.DOCUMENTATION
 import com.intellij.grazie.text.TextContent.TextDomain.LITERALS
 import com.intellij.grazie.text.TextProblem
+import com.intellij.grazie.utils.ProblemFilterUtil
 import org.jetbrains.kotlin.kdoc.psi.impl.KDocTag
 
 class KotlinProblemFilter : ProblemFilter() {
@@ -14,8 +15,9 @@ class KotlinProblemFilter : ProblemFilter() {
         if (domain == LITERALS) {
             return problem.fitsGroup(RuleGroup.LITERALS)
         }
-        if (domain == DOCUMENTATION && problem.text.commonParent::class == KDocTag::class) {
-            return problem.fitsGroup(RuleGroup.UNDECORATED_SINGLE_SENTENCE)
+        if (domain == DOCUMENTATION && problem.text.commonParent::class == KDocTag::class &&
+            (ProblemFilterUtil.isUndecoratedSingleSentenceIssue(problem) || ProblemFilterUtil.isInitialCasingIssue(problem))) {
+            return true
         }
         return false
     }
diff --git a/plugins/kotlin/idea/tests/testData/grazie/Docs.kt b/plugins/kotlin/idea/tests/testData/grazie/Docs.kt
index f3c1ded8fc7c..96cbabf8b0d4 100644
--- a/plugins/kotlin/idea/tests/testData/grazie/Docs.kt
+++ b/plugins/kotlin/idea/tests/testData/grazie/Docs.kt
@@ -8,7 +8,7 @@ package ide.language.kotlin
  * This class has no useful logic; it's just a documentation example.
  *
  * @param T the type of member in this group.
- * @property name the name of this group.
+ * @property name the name of this group. And another sentence.
  * @constructor Creates an empty group.
  */
 class ExampleClassWithNoTypos<T>(val name: String) {
@@ -25,7 +25,7 @@ class ExampleClassWithNoTypos<T>(val name: String) {
  * It is <warning descr="EN_A_VS_AN">an</warning> friend of human
  *
  * @param T the <warning descr="KIND_OF_A">type of a</warning> <TYPO descr="Typo: In word 'membr'">membr</TYPO> in this group.
- * @property name the <warning descr="COMMA_WHICH">name which</warning> group
+ * @property name the <warning descr="COMMA_WHICH">name which</warning> group. <warning descr="UPPERCASE_SENTENCE_START">and</warning> another sentence.
  * @constructor Creates an empty group.
  */
 class ExampleClassWithTypos<T>(val name: String) {
diff --git a/python/python-grazie/resources/META-INF/python-grazie-plugin.xml b/python/python-grazie/resources/META-INF/python-grazie-plugin.xml
index c2a27a4810b7..48c4c65b401f 100644
--- a/python/python-grazie/resources/META-INF/python-grazie-plugin.xml
+++ b/python/python-grazie/resources/META-INF/python-grazie-plugin.xml
@@ -2,5 +2,6 @@
   <extensions defaultExtensionNs="com.intellij.grazie">
     <textExtractor language="Python" implementationClass="com.intellij.grazie.ide.language.python.PythonTextExtractor"/>
     <problemFilter language="Python" implementationClass="com.intellij.grazie.text.LiteralProblemFilter"/>
+    <problemFilter language="Python" implementationClass="com.intellij.grazie.ide.language.python.PythonProblemFilter"/>
   </extensions>
 </idea-plugin>
\ No newline at end of file
diff --git a/python/python-grazie/src/com/intellij/grazie/ide/language/python/PythonProblemFilter.kt b/python/python-grazie/src/com/intellij/grazie/ide/language/python/PythonProblemFilter.kt
new file mode 100644
index 000000000000..00c580716bf3
--- /dev/null
+++ b/python/python-grazie/src/com/intellij/grazie/ide/language/python/PythonProblemFilter.kt
@@ -0,0 +1,25 @@
+package com.intellij.grazie.ide.language.python
+
+import com.intellij.grazie.text.ProblemFilter
+import com.intellij.grazie.text.RuleGroup
+import com.intellij.grazie.text.TextContent
+import com.intellij.grazie.text.TextProblem
+import com.intellij.grazie.utils.ProblemFilterUtil
+
+class PythonProblemFilter : ProblemFilter() {
+  override fun shouldIgnore(problem: TextProblem): Boolean {
+    val domain = problem.text.domain
+    if (domain == TextContent.TextDomain.LITERALS) {
+      return problem.fitsGroup(RuleGroup.LITERALS)
+    }
+    if (domain == TextContent.TextDomain.DOCUMENTATION && seemsDocString(problem.text) &&
+        (ProblemFilterUtil.isUndecoratedSingleSentenceIssue(problem) || ProblemFilterUtil.isInitialCasingIssue(problem))) {
+      return true
+    }
+    return false
+  }
+
+  private fun seemsDocString(text: TextContent) =
+    text.containingFile.viewProvider.contents.subSequence(0, text.textOffsetToFile(0)).trim().endsWith(":")
+
+}
\ No newline at end of file
diff --git a/python/testData/grazie/Docs.py b/python/testData/grazie/Docs.py
index dc0833b5e84c..dece70ae1d71 100644
--- a/python/testData/grazie/Docs.py
+++ b/python/testData/grazie/Docs.py
@@ -8,10 +8,10 @@ class ExampleClassWithNoTypos:
     This class has no useful logic; it's just a documentation example.
 
     Args:
-        name (str): the name of this group.
+        name (str): the name of this group. And another sentence.
 
     Attributes:
-        name (str): the name of this group.
+        name (str): the name of this group. <warning descr="UPPERCASE_SENTENCE_START">and</warning> another sentence.
 
     """
 
diff --git a/python/testData/grazie/DocstringTagsAreExcluded.py b/python/testData/grazie/DocstringTagsAreExcluded.py
index 307377329635..db9ea973bc20 100644
--- a/python/testData/grazie/DocstringTagsAreExcluded.py
+++ b/python/testData/grazie/DocstringTagsAreExcluded.py
@@ -2,6 +2,6 @@ def f(user):
     """
     :param user: user
     Loose punctuation mark.
-    :param user: user
+    :param user: <warning descr="UPPERCASE_SENTENCE_START">user</warning>
     """
     pass
\ No newline at end of file