diff --git a/client/public/version.js b/client/public/version.js
index 3f681a6..5546dec 100644
--- a/client/public/version.js
+++ b/client/public/version.js
@@ -1,5 +1,5 @@
 // Maintainer-controlled web client version.
 // Format: YYYY.MM.DD Rn (example: 2026.02.20 R2)
-window.CHGRID_WEB_VERSION = "2026.02.22 R145";
+window.CHGRID_WEB_VERSION = "2026.02.22 R146";
 // Optional display timezone for timestamps. Falls back to America/Detroit if unset/invalid.
 window.CHGRID_TIME_ZONE = "America/Detroit";
diff --git a/server/app/item_catalog.py b/server/app/item_catalog.py
index f183e51..877a296 100644
--- a/server/app/item_catalog.py
+++ b/server/app/item_catalog.py
@@ -86,8 +86,16 @@ ITEM_TYPE_TOOLTIPS: dict[ItemType, str] = {
 }
 
 GLOBAL_ITEM_PROPERTY_METADATA: dict[str, dict[str, object]] = {
-    "useSound": {"valueType": "sound", "tooltip": "One-shot sound played when this item is used successfully."},
-    "emitSound": {"valueType": "sound", "tooltip": "Looping sound emitted from this item on the grid."},
+    "useSound": {
+        "valueType": "sound",
+        "tooltip": "One-shot sound played when this item is used successfully.",
+        "maxLength": 2048,
+    },
+    "emitSound": {
+        "valueType": "sound",
+        "tooltip": "Looping sound emitted from this item on the grid.",
+        "maxLength": 2048,
+    },
     "useCooldownMs": {"valueType": "number", "tooltip": "Global cooldown in milliseconds between uses for this item type."},
     "emitRange": {"valueType": "number", "tooltip": "Maximum distance in squares where emitted audio can be heard."},
     "directional": {"valueType": "boolean", "tooltip": "Whether emitted audio favors the item's facing direction."},
diff --git a/server/app/items/radio.py b/server/app/items/radio.py
index 39c16e2..22def72 100644
--- a/server/app/items/radio.py
+++ b/server/app/items/radio.py
@@ -44,7 +44,7 @@ EFFECT_OPTIONS: tuple[str, ...] = ("reverb", "echo", "flanger", "high_pass", "lo
 
 PROPERTY_METADATA: dict[str, dict[str, object]] = {
     "title": {"valueType": "text", "tooltip": "Display name spoken and shown for this item.", "maxLength": 80},
-    "streamUrl": {"valueType": "text", "tooltip": "Audio stream URL used by this radio."},
+    "streamUrl": {"valueType": "text", "tooltip": "Audio stream URL used by this radio.", "maxLength": 2048},
     "enabled": {"valueType": "boolean", "tooltip": "Turns playback on or off for this radio."},
     "mediaVolume": {
         "valueType": "number",
@@ -75,6 +75,8 @@ def validate_update(item: WorldItem, next_params: dict) -> dict:
     """Validate and normalize radio params."""
 
     stream_url = str(next_params.get("streamUrl", "")).strip()
+    if len(stream_url) > 2048:
+        raise ValueError("streamUrl must be 2048 characters or less.")
     previous_stream_url = str(item.params.get("streamUrl", "")).strip()
     next_params["streamUrl"] = stream_url
 
diff --git a/server/app/items/widget.py b/server/app/items/widget.py
index 981aa26..e30e1ed 100644
--- a/server/app/items/widget.py
+++ b/server/app/items/widget.py
@@ -81,8 +81,16 @@ PROPERTY_METADATA: dict[str, dict[str, object]] = {
         "tooltip": "Amount for emit effect.",
         "range": {"min": 0, "max": 100, "step": 0.1},
     },
-    "useSound": {"valueType": "sound", "tooltip": "Sound played on use. Filename assumes sounds folder, or use full URL."},
-    "emitSound": {"valueType": "sound", "tooltip": "Looping emitted sound. Filename assumes sounds folder, or use full URL."},
+    "useSound": {
+        "valueType": "sound",
+        "tooltip": "Sound played on use. Filename assumes sounds folder, or use full URL.",
+        "maxLength": 2048,
+    },
+    "emitSound": {
+        "valueType": "sound",
+        "tooltip": "Looping emitted sound. Filename assumes sounds folder, or use full URL.",
+        "maxLength": 2048,
+    },
 }
 
 
@@ -169,6 +177,10 @@ def validate_update(item: WorldItem, next_params: dict) -> dict:
 
     next_params["useSound"] = _normalize_sound_value(next_params.get("useSound", item.params.get("useSound", "")))
     next_params["emitSound"] = _normalize_sound_value(next_params.get("emitSound", item.params.get("emitSound", "")))
+    if len(next_params["useSound"]) > 2048:
+        raise ValueError("useSound must be 2048 characters or less.")
+    if len(next_params["emitSound"]) > 2048:
+        raise ValueError("emitSound must be 2048 characters or less.")
     return next_params