diff --git a/paper-api/src/main/java/io/papermc/paper/registry/data/dialog/DialogInstancesProvider.java b/paper-api/src/main/java/io/papermc/paper/registry/data/dialog/DialogInstancesProvider.java
index e05d4fdae193..5f34fd4064d1 100644
--- a/paper-api/src/main/java/io/papermc/paper/registry/data/dialog/DialogInstancesProvider.java
+++ b/paper-api/src/main/java/io/papermc/paper/registry/data/dialog/DialogInstancesProvider.java
@@ -24,6 +24,7 @@
 import net.kyori.adventure.text.event.ClickCallback;
 import net.kyori.adventure.text.event.ClickEvent;
 import org.bukkit.inventory.ItemStack;
+import org.intellij.lang.annotations.Pattern;
 import org.jetbrains.annotations.ApiStatus;
 import org.jspecify.annotations.Nullable;
 
@@ -62,15 +63,15 @@ final class Holder {
     PlainMessageDialogBody plainMessageDialogBody(Component component, int width);
 
     // inputs
-    BooleanDialogInput.Builder booleanBuilder(String key, Component label);
+    BooleanDialogInput.Builder booleanBuilder(@Pattern("^[a-zA-Z0-9_]+$") String key, Component label);
 
-    NumberRangeDialogInput.Builder numberRangeBuilder(String key, Component label, float start, float end);
+    NumberRangeDialogInput.Builder numberRangeBuilder(@Pattern("^[a-zA-Z0-9_]+$") String key, Component label, float start, float end);
 
-    SingleOptionDialogInput.Builder singleOptionBuilder(String key, Component label, List<SingleOptionDialogInput.OptionEntry> entries);
+    SingleOptionDialogInput.Builder singleOptionBuilder(@Pattern("^[a-zA-Z0-9_]+$") String key, Component label, List<SingleOptionDialogInput.OptionEntry> entries);
 
     SingleOptionDialogInput.OptionEntry singleOptionEntry(String id, @Nullable Component display, boolean initial);
 
-    TextDialogInput.Builder textBuilder(String key, Component label);
+    TextDialogInput.Builder textBuilder(@Pattern("^[a-zA-Z0-9_]+$") String key, Component label);
 
     TextDialogInput.MultilineOptions multilineOptions(@Nullable Integer maxLines, @Nullable Integer height);
 
diff --git a/paper-api/src/main/java/io/papermc/paper/registry/data/dialog/input/DialogInput.java b/paper-api/src/main/java/io/papermc/paper/registry/data/dialog/input/DialogInput.java
index 71203feab4f5..fcb61d95db25 100644
--- a/paper-api/src/main/java/io/papermc/paper/registry/data/dialog/input/DialogInput.java
+++ b/paper-api/src/main/java/io/papermc/paper/registry/data/dialog/input/DialogInput.java
@@ -4,6 +4,7 @@
 import java.util.List;
 import net.kyori.adventure.text.Component;
 import org.checkerframework.checker.index.qual.Positive;
+import org.intellij.lang.annotations.Pattern;
 import org.jetbrains.annotations.Contract;
 import org.jetbrains.annotations.Range;
 import org.jspecify.annotations.Nullable;
@@ -24,7 +25,7 @@ public sealed interface DialogInput permits BooleanDialogInput, NumberRangeDialo
      * @return a new boolean dialog input instance
      */
     @Contract(pure = true, value = "_, _, _, _, _ -> new")
-    static BooleanDialogInput bool(final String key, final Component label, final boolean initial, final String onTrue, final String onFalse) {
+    static BooleanDialogInput bool(@Pattern("^[a-zA-Z0-9_]+$") final String key, final Component label, final boolean initial, final String onTrue, final String onFalse) {
         return bool(key, label)
             .initial(initial)
             .onTrue(onTrue)
@@ -40,7 +41,7 @@ static BooleanDialogInput bool(final String key, final Component label, final bo
      * @return a new builder instance
      */
     @Contract(pure = true, value = "_, _ -> new")
-    static BooleanDialogInput.Builder bool(final String key, final Component label) {
+    static BooleanDialogInput.Builder bool(@Pattern("^[a-zA-Z0-9_]+$") final String key, final Component label) {
         return DialogInstancesProvider.instance().booleanBuilder(key, label);
     }
 
@@ -59,7 +60,7 @@ static BooleanDialogInput.Builder bool(final String key, final Component label)
      */
     @Contract(pure = true, value = "_, _, _, _, _, _, _, _ -> new")
     static NumberRangeDialogInput numberRange(
-        final String key,
+        @Pattern("^[a-zA-Z0-9_]+$") final String key,
         final @Range(from = 1, to = 1024) int width,
         final Component label,
         final String labelFormat,
@@ -81,7 +82,7 @@ static NumberRangeDialogInput numberRange(
      * @return a new builder instance
      */
     @Contract(pure = true, value = "_, _, _, _ -> new")
-    static NumberRangeDialogInput.Builder numberRange(final String key, final Component label, final float start, final float end) {
+    static NumberRangeDialogInput.Builder numberRange(@Pattern("^[a-zA-Z0-9_]+$") final String key, final Component label, final float start, final float end) {
         return DialogInstancesProvider.instance().numberRangeBuilder(key, label, start, end);
     }
 
@@ -97,7 +98,7 @@ static NumberRangeDialogInput.Builder numberRange(final String key, final Compon
      */
     @Contract(pure = true, value = "_, _, _, _, _ -> new")
     static SingleOptionDialogInput singleOption(
-        final String key,
+        @Pattern("^[a-zA-Z0-9_]+$") final String key,
         final @Range(from = 1, to = 1024) int width,
         final List<SingleOptionDialogInput.OptionEntry> entries,
         final Component label,
@@ -115,7 +116,7 @@ static SingleOptionDialogInput singleOption(
      * @return a new builder instance
      */
     @Contract(pure = true, value = "_, _, _ -> new")
-    static SingleOptionDialogInput.Builder singleOption(final String key, final Component label, final List<SingleOptionDialogInput.OptionEntry> entries) {
+    static SingleOptionDialogInput.Builder singleOption(@Pattern("^[a-zA-Z0-9_]+$") final String key, final Component label, final List<SingleOptionDialogInput.OptionEntry> entries) {
         return DialogInstancesProvider.instance().singleOptionBuilder(key, label, entries);
     }
 
@@ -133,7 +134,7 @@ static SingleOptionDialogInput.Builder singleOption(final String key, final Comp
      */
     @Contract(pure = true, value = "_, _, _, _, _, _, _ -> new")
     static TextDialogInput text(
-        final String key,
+        @Pattern("^[a-zA-Z0-9_]+$") final String key,
         final @Range(from = 1, to = 1024) int width,
         final Component label,
         final boolean labelVisible,
@@ -152,7 +153,7 @@ static TextDialogInput text(
      * @return a new builder instance
      */
     @Contract(value = "_, _ -> new", pure = true)
-    static TextDialogInput.Builder text(final String key, final Component label) {
+    static TextDialogInput.Builder text(@Pattern("^[a-zA-Z0-9_]+$") final String key, final Component label) {
         return DialogInstancesProvider.instance().textBuilder(key, label);
     }
 
diff --git a/paper-server/src/main/java/io/papermc/paper/registry/data/dialog/PaperDialogInstancesProvider.java b/paper-server/src/main/java/io/papermc/paper/registry/data/dialog/PaperDialogInstancesProvider.java
index 4731d52d8f9a..b3c5a17fba0f 100644
--- a/paper-server/src/main/java/io/papermc/paper/registry/data/dialog/PaperDialogInstancesProvider.java
+++ b/paper-server/src/main/java/io/papermc/paper/registry/data/dialog/PaperDialogInstancesProvider.java
@@ -41,6 +41,7 @@
 import net.minecraft.core.UUIDUtil;
 import net.minecraft.nbt.CompoundTag;
 import org.bukkit.inventory.ItemStack;
+import org.intellij.lang.annotations.Pattern;
 import org.jspecify.annotations.Nullable;
 
 public final class PaperDialogInstancesProvider implements DialogInstancesProvider {
@@ -94,17 +95,17 @@ public PlainMessageDialogBody plainMessageDialogBody(final Component component,
     }
 
     @Override
-    public BooleanDialogInput.Builder booleanBuilder(final String key, final Component label) {
+    public BooleanDialogInput.Builder booleanBuilder(@Pattern("^[a-zA-Z0-9_]+$") final String key, final Component label) {
         return new BooleanDialogInputImpl.BuilderImpl(key, label);
     }
 
     @Override
-    public NumberRangeDialogInput.Builder numberRangeBuilder(final String key, final Component label, final float start, final float end) {
+    public NumberRangeDialogInput.Builder numberRangeBuilder(@Pattern("^[a-zA-Z0-9_]+$") final String key, final Component label, final float start, final float end) {
         return new NumberRangeDialogInputImpl.BuilderImpl(key, label, start, end);
     }
 
     @Override
-    public SingleOptionDialogInput.Builder singleOptionBuilder(final String key, final Component label, final List<SingleOptionDialogInput.OptionEntry> entries) {
+    public SingleOptionDialogInput.Builder singleOptionBuilder(@Pattern("^[a-zA-Z0-9_]+$") final String key, final Component label, final List<SingleOptionDialogInput.OptionEntry> entries) {
         return new SingleOptionDialogInputImpl.BuilderImpl(key, entries, label);
     }
 
@@ -114,7 +115,7 @@ public SingleOptionDialogInput.OptionEntry singleOptionEntry(final String id, fi
     }
 
     @Override
-    public TextDialogInput.Builder textBuilder(final String key, final Component label) {
+    public TextDialogInput.Builder textBuilder(@Pattern("^[a-zA-Z0-9_]+$") final String key, final Component label) {
         return new TextDialogInputImpl.BuilderImpl(key, label);
     }