diff --git a/.claude/skills/skd-compile/SKILL.md b/.claude/skills/skd-compile/SKILL.md
index 1886d419..8a8853bc 100644
--- a/.claude/skills/skd-compile/SKILL.md
+++ b/.claude/skills/skd-compile/SKILL.md
@@ -147,6 +147,8 @@ Shorthand: `"Имя [Заголовок]: тип = значение @флаги"
 
 Объектная форма: `title`, `hidden: true`, `valueListAllowed: true`, `availableAsField: false`, `denyIncompleteValues: true`, `use: "Always"`.
 
+Если значения по умолчанию нет — пропусти `=` в shorthand или укажи `"value": null` в объектной форме.
+
 Список допустимых значений (availableValues):
 
 ```json
diff --git a/.claude/skills/skd-compile/scripts/skd-compile.ps1 b/.claude/skills/skd-compile/scripts/skd-compile.ps1
index 671c5486..df537bbe 100644
--- a/.claude/skills/skd-compile/scripts/skd-compile.ps1
+++ b/.claude/skills/skd-compile/scripts/skd-compile.ps1
@@ -1,4 +1,4 @@
-# skd-compile v1.23 — Compile 1C DCS from JSON
+# skd-compile v1.24 — Compile 1C DCS from JSON
 # Source: https://github.com/Nikolay-Shirokov/cc-1c-skills
 param(
 	[string]$DefinitionFile,
@@ -375,8 +375,8 @@ function Parse-ParamShorthand {
 		$s = ($s -replace '\s*\[[^\]]*\]\s*', ' ').Trim()
 	}
 
-	# Split "Name: Type = Value"
-	if ($s -match '^([^:]+):\s*(\S+)(\s*=\s*(.+))?$') {
+	# Split "Name: Type = Value" — RHS may be empty (`= ` / `=`) → treated as empty value
+	if ($s -match '^([^:]+):\s*(\S+)(\s*=\s*(.*))?$') {
 		$result.name = $Matches[1].Trim()
 		$result.type = Resolve-TypeStr ($Matches[2].Trim())
 		if ($Matches[4]) {
@@ -985,8 +985,9 @@ function Emit-SingleParam {
 		X "`t`t</valueType>"
 	}
 
-	# Value
-	Emit-ParamValue -type $parsed.type -val $parsed.value -indent "`t`t"
+	# Value — for valueListAllowed params Designer omits <value> when empty
+	$vla = [bool]$parsed.valueListAllowed
+	Emit-ParamValue -type $parsed.type -val $parsed.value -indent "`t`t" -valueListAllowed $vla
 
 	# Hidden implies useRestriction=true + availableAsField=false
 	if ($parsed.hidden -eq $true) {
@@ -1017,13 +1018,17 @@ function Emit-SingleParam {
 	# AvailableValues
 	if ($p -isnot [string] -and $p.availableValues) {
 		foreach ($av in $p.availableValues) {
-			$avVal = "$($av.value)"
-			$avType = "xs:string"
-			if ($avVal -match '^(Перечисление|Справочник|ПланСчетов|Документ|ПланВидовХарактеристик|ПланВидовРасчета)\.') {
-				$avType = "dcscor:DesignTimeValue"
-			}
 			X "`t`t<availableValue>"
-			X "`t`t`t<value xsi:type=`"$avType`">$(Esc-Xml $avVal)</value>"
+			if (Test-EmptyValue $av.value) {
+				Emit-EmptyValue -type $parsed.type -indent "`t`t`t" -tagPrefix "" -valueListAllowed $false
+			} else {
+				$avVal = "$($av.value)"
+				$avType = "xs:string"
+				if ($avVal -match '^(Перечисление|Справочник|ПланСчетов|Документ|ПланВидовХарактеристик|ПланВидовРасчета)\.') {
+					$avType = "dcscor:DesignTimeValue"
+				}
+				X "`t`t`t<value xsi:type=`"$avType`">$(Esc-Xml $avVal)</value>"
+			}
 			# `title` accepted as synonym of `presentation` — both map to the same UI label.
 			$avPres = if ($av.presentation) { $av.presentation } elseif ($av.title) { $av.title } else { "" }
 			if ($avPres) {
@@ -1107,10 +1112,52 @@ function Emit-Parameters {
 	}
 }
 
-function Emit-ParamValue {
-	param([string]$type, $val, [string]$indent)
+function Test-EmptyValue {
+	param($v)
+	if ($null -eq $v) { return $true }
+	$s = "$v".Trim()
+	if ($s -eq "") { return $true }
+	if ($s -eq "_") { return $true }
+	if ($s.ToLowerInvariant() -eq "null") { return $true }
+	return $false
+}
 
-	if ($null -eq $val) { return }
+function Emit-EmptyValue {
+	param([string]$type, [string]$indent, [string]$tagPrefix = "", [bool]$valueListAllowed = $false)
+
+	if ($valueListAllowed) { return }
+	$t = if ($null -eq $type) { "" } else { "$type" }
+	$pf = $tagPrefix
+
+	if ($t -eq "") {
+		X "$indent<${pf}value xsi:nil=`"true`"/>"
+	} elseif ($t -eq "StandardPeriod") {
+		X "$indent<${pf}value xsi:type=`"v8:StandardPeriod`">"
+		X "$indent`t<v8:variant xsi:type=`"v8:StandardPeriodVariant`">Custom</v8:variant>"
+		X "$indent`t<v8:startDate>0001-01-01T00:00:00</v8:startDate>"
+		X "$indent`t<v8:endDate>0001-01-01T00:00:00</v8:endDate>"
+		X "$indent</${pf}value>"
+	} elseif ($t -match '^string') {
+		X "$indent<${pf}value xsi:type=`"xs:string`"/>"
+	} elseif ($t -match '^date') {
+		X "$indent<${pf}value xsi:type=`"xs:dateTime`">0001-01-01T00:00:00</${pf}value>"
+	} elseif ($t -match '^decimal') {
+		X "$indent<${pf}value xsi:type=`"xs:decimal`">0</${pf}value>"
+	} elseif ($t -eq "boolean") {
+		X "$indent<${pf}value xsi:type=`"xs:boolean`">false</${pf}value>"
+	} else {
+		# Ref types or unknown — safe nil
+		X "$indent<${pf}value xsi:nil=`"true`"/>"
+	}
+}
+
+function Emit-ParamValue {
+	param([string]$type, $val, [string]$indent, [bool]$valueListAllowed = $false)
+
+	if (Test-EmptyValue $val) {
+		Emit-EmptyValue -type $type -indent $indent -tagPrefix "" -valueListAllowed $valueListAllowed
+		return
+	}
 
 	$valStr = "$val"
 
@@ -1868,6 +1915,8 @@ function Emit-DataParameters {
 		# Value
 		if ($dp.nilValue -eq $true) {
 			X "$indent`t`t<dcscor:value xsi:nil=`"true`"/>"
+		} elseif (Test-EmptyValue $dp.value) {
+			Emit-EmptyValue -type "$($dp.valueType)" -indent "$indent`t`t" -tagPrefix "dcscor:" -valueListAllowed $false
 		} elseif ($null -ne $dp.value) {
 			$vtype = "$($dp.valueType)"
 			if ($dp.value -is [PSCustomObject] -and $dp.value.variant) {
@@ -2206,7 +2255,7 @@ function Emit-SettingsVariants {
 					}
 					$dpItem | Add-Member -NotePropertyName "value" -NotePropertyValue @{ variant = $variant }
 					if ($variant -ne 'Custom') { $hasMeaningfulValue = $true }
-				} elseif ($null -ne $ap.value -and "$($ap.value)" -ne '') {
+				} elseif (-not (Test-EmptyValue $ap.value)) {
 					$dpItem | Add-Member -NotePropertyName "value" -NotePropertyValue $ap.value
 					$dpItem | Add-Member -NotePropertyName "valueType" -NotePropertyValue "$($ap.type)"
 					$hasMeaningfulValue = $true
diff --git a/.claude/skills/skd-compile/scripts/skd-compile.py b/.claude/skills/skd-compile/scripts/skd-compile.py
index 5f8384c8..38efd58f 100644
--- a/.claude/skills/skd-compile/scripts/skd-compile.py
+++ b/.claude/skills/skd-compile/scripts/skd-compile.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python3
-# skd-compile v1.23 — Compile 1C DCS from JSON
+# skd-compile v1.24 — Compile 1C DCS from JSON
 # Source: https://github.com/Nikolay-Shirokov/cc-1c-skills
 import argparse
 import json
@@ -282,8 +282,8 @@ def parse_param_shorthand(s):
         result['title'] = m.group(1).strip()
         s = re.sub(r'\s*\[[^\]]*\]\s*', ' ', s).strip()
 
-    # Split "Name: Type = Value"
-    m = re.match(r'^([^:]+):\s*(\S+)(\s*=\s*(.+))?$', s)
+    # Split "Name: Type = Value" — RHS may be empty (`= ` / `=`) → treated as empty value
+    m = re.match(r'^([^:]+):\s*(\S+)(\s*=\s*(.*))?$', s)
     if m:
         result['name'] = m.group(1).strip()
         result['type'] = resolve_type_str(m.group(2).strip())
@@ -790,8 +790,49 @@ def emit_total_fields(lines, defn):
 
 # === Parameters ===
 
-def emit_param_value(lines, type_str, val, indent):
-    if val is None:
+def is_empty_value(v):
+    if v is None:
+        return True
+    s = str(v).strip()
+    if s == '':
+        return True
+    if s == '_':
+        return True
+    if s.lower() == 'null':
+        return True
+    return False
+
+
+def emit_empty_value(lines, type_str, indent, tag_prefix='', value_list_allowed=False):
+    if value_list_allowed:
+        return
+    t = type_str or ''
+    pf = tag_prefix
+
+    if t == '':
+        lines.append(f'{indent}<{pf}value xsi:nil="true"/>')
+    elif t == 'StandardPeriod':
+        lines.append(f'{indent}<{pf}value xsi:type="v8:StandardPeriod">')
+        lines.append(f'{indent}\t<v8:variant xsi:type="v8:StandardPeriodVariant">Custom</v8:variant>')
+        lines.append(f'{indent}\t<v8:startDate>0001-01-01T00:00:00</v8:startDate>')
+        lines.append(f'{indent}\t<v8:endDate>0001-01-01T00:00:00</v8:endDate>')
+        lines.append(f'{indent}</{pf}value>')
+    elif re.match(r'^string', t):
+        lines.append(f'{indent}<{pf}value xsi:type="xs:string"/>')
+    elif re.match(r'^date', t):
+        lines.append(f'{indent}<{pf}value xsi:type="xs:dateTime">0001-01-01T00:00:00</{pf}value>')
+    elif re.match(r'^decimal', t):
+        lines.append(f'{indent}<{pf}value xsi:type="xs:decimal">0</{pf}value>')
+    elif t == 'boolean':
+        lines.append(f'{indent}<{pf}value xsi:type="xs:boolean">false</{pf}value>')
+    else:
+        # Ref types or unknown — safe nil
+        lines.append(f'{indent}<{pf}value xsi:nil="true"/>')
+
+
+def emit_param_value(lines, type_str, val, indent, value_list_allowed=False):
+    if is_empty_value(val):
+        emit_empty_value(lines, type_str, indent, '', value_list_allowed)
         return
 
     val_str = str(val)
@@ -847,8 +888,9 @@ def emit_single_param(lines, p, parsed):
         emit_value_type(lines, parsed['type'], '\t\t\t')
         lines.append('\t\t</valueType>')
 
-    # Value
-    emit_param_value(lines, parsed.get('type', ''), parsed.get('value'), '\t\t')
+    # Value — for valueListAllowed params Designer omits <value> when empty
+    vla = bool(parsed.get('valueListAllowed'))
+    emit_param_value(lines, parsed.get('type', ''), parsed.get('value'), '\t\t', vla)
 
     # Hidden implies useRestriction=true + availableAsField=false
     if parsed.get('hidden') is True:
@@ -876,12 +918,15 @@ def emit_single_param(lines, p, parsed):
     # AvailableValues
     if p is not None and not isinstance(p, str) and p.get('availableValues'):
         for av in p['availableValues']:
-            av_val = str(av.get('value', ''))
-            av_type = 'xs:string'
-            if re.match(r'^(Перечисление|Справочник|ПланСчетов|Документ|ПланВидовХарактеристик|ПланВидовРасчета)\.', av_val):
-                av_type = 'dcscor:DesignTimeValue'
             lines.append('\t\t<availableValue>')
-            lines.append(f'\t\t\t<value xsi:type="{av_type}">{esc_xml(av_val)}</value>')
+            if is_empty_value(av.get('value')):
+                emit_empty_value(lines, parsed.get('type', ''), '\t\t\t', '', False)
+            else:
+                av_val = str(av.get('value', ''))
+                av_type = 'xs:string'
+                if re.match(r'^(Перечисление|Справочник|ПланСчетов|Документ|ПланВидовХарактеристик|ПланВидовРасчета)\.', av_val):
+                    av_type = 'dcscor:DesignTimeValue'
+                lines.append(f'\t\t\t<value xsi:type="{av_type}">{esc_xml(av_val)}</value>')
             # `title` accepted as synonym of `presentation` — both map to the same UI label.
             av_pres = av.get('presentation') or av.get('title') or ''
             if av_pres:
@@ -1585,6 +1630,8 @@ def emit_data_parameters(lines, items, indent):
         # Value
         if dp.get('nilValue') is True:
             lines.append(f'{indent}\t\t<dcscor:value xsi:nil="true"/>')
+        elif is_empty_value(dp.get('value')):
+            emit_empty_value(lines, str(dp.get('valueType') or ''), f'{indent}\t\t', 'dcscor:', False)
         elif dp.get('value') is not None:
             val = dp['value']
             vtype = str(dp.get('valueType') or '')
@@ -1853,7 +1900,7 @@ def emit_settings_variants(lines, defn):
                     item['value'] = {'variant': variant}
                     if variant != 'Custom':
                         has_meaningful_value = True
-                elif ap.get('value') is not None and str(ap.get('value')) != '':
+                elif not is_empty_value(ap.get('value')):
                     item['value'] = ap['value']
                     item['valueType'] = str(ap.get('type') or '')
                     has_meaningful_value = True
diff --git a/tests/skills/cases/skd-compile/empty-param-values.json b/tests/skills/cases/skd-compile/empty-param-values.json
new file mode 100644
index 00000000..2131d040
--- /dev/null
+++ b/tests/skills/cases/skd-compile/empty-param-values.json
@@ -0,0 +1,27 @@
+{
+  "name": "Параметры с пустыми значениями (все типы, разные sentinel-формы)",
+  "params": { "outputPath": "Template.xml" },
+  "input": {
+    "dataSets": [{
+      "name": "Основной",
+      "query": "ВЫБРАТЬ 1 КАК Поле1",
+      "fields": ["Поле1: число(1,0)"]
+    }],
+    "parameters": [
+      "Параметр1",
+      "Параметр2: string =",
+      "ПараметрСписок: EnumRef.СтатусТеста @valueList = _",
+      "ПараметрСсылка: CatalogRef.ПлоскийПростой",
+      "ПараметрДата: date = null",
+      { "name": "ПараметрЧисло", "type": "decimal", "value": null },
+      "ПараметрБулево: boolean = ",
+      "ПараметрСтандартныйПериод: StandardPeriod = _",
+      { "name": "ПараметрТипНеЗадан", "value": null },
+      "ПараметрСписокСтрок: string @valueList"
+    ]
+  },
+  "validatePath": "Template.xml",
+  "expect": {
+    "files": ["Template.xml"]
+  }
+}
diff --git a/tests/skills/cases/skd-compile/snapshots/auto-data-parameters/Template.xml b/tests/skills/cases/skd-compile/snapshots/auto-data-parameters/Template.xml
index c1f7b2ca..d2270b2f 100644
--- a/tests/skills/cases/skd-compile/snapshots/auto-data-parameters/Template.xml
+++ b/tests/skills/cases/skd-compile/snapshots/auto-data-parameters/Template.xml
@@ -77,6 +77,11 @@
 		<valueType>
 			<v8:Type>v8:StandardPeriod</v8:Type>
 		</valueType>
+		<value xsi:type="v8:StandardPeriod">
+			<v8:variant xsi:type="v8:StandardPeriodVariant">Custom</v8:variant>
+			<v8:startDate>0001-01-01T00:00:00</v8:startDate>
+			<v8:endDate>0001-01-01T00:00:00</v8:endDate>
+		</value>
 	</parameter>
 	<parameter>
 		<name>Флаг</name>
@@ -129,6 +134,7 @@
 				<v8:AllowedLength>Variable</v8:AllowedLength>
 			</v8:StringQualifiers>
 		</valueType>
+		<value xsi:type="xs:string"/>
 	</parameter>
 	<parameter>
 		<name>Валюта</name>
diff --git a/tests/skills/cases/skd-compile/snapshots/empty-param-values/Template.xml b/tests/skills/cases/skd-compile/snapshots/empty-param-values/Template.xml
new file mode 100644
index 00000000..624a0bb3
--- /dev/null
+++ b/tests/skills/cases/skd-compile/snapshots/empty-param-values/Template.xml
@@ -0,0 +1,131 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<DataCompositionSchema xmlns="http://v8.1c.ru/8.1/data-composition-system/schema"
+		xmlns:dcscom="http://v8.1c.ru/8.1/data-composition-system/common"
+		xmlns:dcscor="http://v8.1c.ru/8.1/data-composition-system/core"
+		xmlns:dcsset="http://v8.1c.ru/8.1/data-composition-system/settings"
+		xmlns:v8="http://v8.1c.ru/8.1/data/core"
+		xmlns:v8ui="http://v8.1c.ru/8.1/data/ui"
+		xmlns:xs="http://www.w3.org/2001/XMLSchema"
+		xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
+	<dataSource>
+		<name>ИсточникДанных1</name>
+		<dataSourceType>Local</dataSourceType>
+	</dataSource>
+	<dataSet xsi:type="DataSetQuery">
+		<name>Основной</name>
+		<field xsi:type="DataSetFieldField">
+			<dataPath>Поле1</dataPath>
+			<field>Поле1</field>
+			<valueType>
+				<v8:Type>xs:decimal</v8:Type>
+				<v8:NumberQualifiers>
+					<v8:Digits>1</v8:Digits>
+					<v8:FractionDigits>0</v8:FractionDigits>
+					<v8:AllowedSign>Any</v8:AllowedSign>
+				</v8:NumberQualifiers>
+			</valueType>
+		</field>
+		<dataSource>ИсточникДанных1</dataSource>
+		<query>ВЫБРАТЬ 1 КАК Поле1</query>
+	</dataSet>
+	<parameter>
+		<name>Параметр1</name>
+		<value xsi:nil="true"/>
+	</parameter>
+	<parameter>
+		<name>Параметр2</name>
+		<valueType>
+			<v8:Type>xs:string</v8:Type>
+			<v8:StringQualifiers>
+				<v8:Length>0</v8:Length>
+				<v8:AllowedLength>Variable</v8:AllowedLength>
+			</v8:StringQualifiers>
+		</valueType>
+		<value xsi:type="xs:string"/>
+	</parameter>
+	<parameter>
+		<name>ПараметрСписок</name>
+		<valueType>
+			<v8:Type xmlns:d5p1="http://v8.1c.ru/8.1/data/enterprise/current-config">d5p1:EnumRef.СтатусТеста</v8:Type>
+		</valueType>
+		<valueListAllowed>true</valueListAllowed>
+	</parameter>
+	<parameter>
+		<name>ПараметрСсылка</name>
+		<valueType>
+			<v8:Type xmlns:d5p1="http://v8.1c.ru/8.1/data/enterprise/current-config">d5p1:CatalogRef.ПлоскийПростой</v8:Type>
+		</valueType>
+		<value xsi:nil="true"/>
+	</parameter>
+	<parameter>
+		<name>ПараметрДата</name>
+		<valueType>
+			<v8:Type>xs:dateTime</v8:Type>
+			<v8:DateQualifiers>
+				<v8:DateFractions>Date</v8:DateFractions>
+			</v8:DateQualifiers>
+		</valueType>
+		<value xsi:type="xs:dateTime">0001-01-01T00:00:00</value>
+	</parameter>
+	<parameter>
+		<name>ПараметрЧисло</name>
+		<valueType>
+			<v8:Type>decimal</v8:Type>
+		</valueType>
+		<value xsi:type="xs:decimal">0</value>
+	</parameter>
+	<parameter>
+		<name>ПараметрБулево</name>
+		<valueType>
+			<v8:Type>xs:boolean</v8:Type>
+		</valueType>
+		<value xsi:type="xs:boolean">false</value>
+	</parameter>
+	<parameter>
+		<name>ПараметрСтандартныйПериод</name>
+		<valueType>
+			<v8:Type>v8:StandardPeriod</v8:Type>
+		</valueType>
+		<value xsi:type="v8:StandardPeriod">
+			<v8:variant xsi:type="v8:StandardPeriodVariant">Custom</v8:variant>
+			<v8:startDate>0001-01-01T00:00:00</v8:startDate>
+			<v8:endDate>0001-01-01T00:00:00</v8:endDate>
+		</value>
+	</parameter>
+	<parameter>
+		<name>ПараметрТипНеЗадан</name>
+		<value xsi:nil="true"/>
+	</parameter>
+	<parameter>
+		<name>ПараметрСписокСтрок</name>
+		<valueType>
+			<v8:Type>xs:string</v8:Type>
+			<v8:StringQualifiers>
+				<v8:Length>0</v8:Length>
+				<v8:AllowedLength>Variable</v8:AllowedLength>
+			</v8:StringQualifiers>
+		</valueType>
+		<valueListAllowed>true</valueListAllowed>
+	</parameter>
+	<settingsVariant>
+		<dcsset:name>Основной</dcsset:name>
+		<dcsset:presentation xsi:type="v8:LocalStringType">
+			<v8:item>
+				<v8:lang>ru</v8:lang>
+				<v8:content>Основной</v8:content>
+			</v8:item>
+		</dcsset:presentation>
+		<dcsset:settings xmlns:style="http://v8.1c.ru/8.1/data/ui/style" xmlns:sys="http://v8.1c.ru/8.1/data/ui/fonts/system" xmlns:web="http://v8.1c.ru/8.1/data/ui/colors/web" xmlns:win="http://v8.1c.ru/8.1/data/ui/colors/windows">
+			<dcsset:selection>
+			</dcsset:selection>
+			<dcsset:item xsi:type="dcsset:StructureItemGroup">
+				<dcsset:order>
+					<dcsset:item xsi:type="dcsset:OrderItemAuto"/>
+				</dcsset:order>
+				<dcsset:selection>
+					<dcsset:item xsi:type="dcsset:SelectedItemAuto"/>
+				</dcsset:selection>
+			</dcsset:item>
+		</dcsset:settings>
+	</settingsVariant>
+</DataCompositionSchema>
diff --git a/tests/skills/cases/skd-compile/snapshots/multi-lang-title/Template.xml b/tests/skills/cases/skd-compile/snapshots/multi-lang-title/Template.xml
index ba89d296..0e810997 100644
--- a/tests/skills/cases/skd-compile/snapshots/multi-lang-title/Template.xml
+++ b/tests/skills/cases/skd-compile/snapshots/multi-lang-title/Template.xml
@@ -71,6 +71,11 @@
 		<valueType>
 			<v8:Type>v8:StandardPeriod</v8:Type>
 		</valueType>
+		<value xsi:type="v8:StandardPeriod">
+			<v8:variant xsi:type="v8:StandardPeriodVariant">Custom</v8:variant>
+			<v8:startDate>0001-01-01T00:00:00</v8:startDate>
+			<v8:endDate>0001-01-01T00:00:00</v8:endDate>
+		</value>
 	</parameter>
 	<settingsVariant>
 		<dcsset:name>Основной</dcsset:name>
diff --git a/tests/skills/cases/skd-compile/snapshots/with-parameters/Template.xml b/tests/skills/cases/skd-compile/snapshots/with-parameters/Template.xml
index 496f1606..4f7e6693 100644
--- a/tests/skills/cases/skd-compile/snapshots/with-parameters/Template.xml
+++ b/tests/skills/cases/skd-compile/snapshots/with-parameters/Template.xml
@@ -104,6 +104,7 @@
 		<valueType>
 			<v8:Type xmlns:d5p1="http://v8.1c.ru/8.1/data/enterprise/current-config">d5p1:CatalogRef.Организации</v8:Type>
 		</valueType>
+		<value xsi:nil="true"/>
 	</parameter>
 	<settingsVariant>
 		<dcsset:name>Основной</dcsset:name>