--- a/rts/Game/WebbarCloakEvents.h
+++ b/rts/Game/WebbarCloakEvents.h
@@ -20,6 +20,18 @@
 inline uint32_t nextID = 0, dropped = 0;
 inline std::unordered_map<int, uint32_t> ownershipLifetimes;
 inline uint32_t nextLifetime = 0;
+inline std::unordered_map<int, bool> publishedBuildStates;
+
+// Observe only after the same owner/live/applicability/cap filters as WBC4.
+// A new lifetime or completion needs current native command descriptions in
+// this publication, before the browser applies its ordinary default policy.
+inline bool CommandMetadataChanged(int unitID, bool beingBuilt)
+{
+	const auto [it, inserted] = publishedBuildStates.emplace(unitID, beingBuilt);
+	const bool changed = inserted || it->second != beingBuilt;
+	it->second = beingBuilt;
+	return changed;
+}
 
 // Called only after the publisher's local-owner and record-limit filters.
 // Hidden unit creation/transfers cannot advance this presentation counter.
@@ -46,6 +58,7 @@
 inline void OwnershipChanged(int unitID)
 {
 	ownershipLifetimes.erase(unitID);
+	publishedBuildStates.erase(unitID);
 	pending.erase(std::remove_if(pending.begin(), pending.end(), [unitID](const Pending& entry) {
 		return entry.event.unit == uint32_t(unitID);
 	}), pending.end());
--- a/rts/Game/WebbarCloak.h
+++ b/rts/Game/WebbarCloak.h
@@ -6,7 +6,7 @@
 
 // Owner-only, read-only presentation. BAR owns cloak requests, resource use,
 // proximity checks and recloak delays. Never infer a reason by scanning enemies.
-static void PublishWebbarCloak()
+static bool PublishWebbarCloak()
 {
 	struct Record {
 		uint32_t unit, flags;
@@ -17,11 +17,13 @@
 	static_assert(sizeof(Record) == 32);
 	std::vector<Record> records;
 	uint32_t dropped = 0;
+	bool commandsChanged = false;
 	for (const CUnit* unit: unitHandler.GetActiveUnits()) {
 		if (unit->isDead || unit->team != gu->myTeam) continue;
 		const auto* def = unit->unitDef;
 		if (!def->canCloak && !unit->isCloaked && !unit->stealth && !unit->sonarStealth && !def->canResurrect && unit->stockpileWeapon == nullptr) continue;
 		if (records.size() >= 4096) { ++dropped; continue; }
+		commandsChanged |= webbarCloakEvents::CommandMetadataChanged(unit->id, unit->beingBuilt);
 		const auto rule = [&](const char* name) {
 			const auto it = unit->modParams.find(name);
 			if (it == unit->modParams.end() || !(it->second.los & LuaRulesParams::RULESPARAMLOS_PRIVATE_MASK)) return -1.0f;
@@ -54,4 +56,5 @@
 	MAIN_THREAD_EM_ASM({
 		if (Module['webbarCloak']) Module['webbarCloak'](HEAPU8.slice($0, $0 + $1).buffer);
 	}, packet.data(), packet.size());
+	return commandsChanged;
 }
--- a/rts/Game/WebbarBrowser.h
+++ b/rts/Game/WebbarBrowser.h
@@ -98,7 +98,8 @@
 			}
 		}
 	}
-	if (gs->frameNum % 30 == 0) {
+	const bool cloakCommandsChanged = PublishWebbarCloak();
+	if (cloakCommandsChanged || gs->frameNum % 30 == 0) {
 		// Batch descriptions into one host call, including native state labels.
 		// Strings are decoded synchronously before the temporary pointer table dies.
 		std::vector<uint32_t> words(1, 0);
@@ -126,8 +127,8 @@
 				}
 				units.push([unit, commands]);
 			}
-			Module['webbarCommandDescriptions'](units);
-		}, words.data(), words.size());
+			Module['webbarCommandDescriptions'](units, $2);
+		}, words.data(), words.size(), gs->frameNum);
 	}
 	const CTeam* team = teamHandler.Team(gu->myTeam);
 	const float economy[] = {team->res.metal, team->resStorage.metal, team->resPrevIncome.metal, team->resPrevExpense.metal, team->resPrevPull.metal,
@@ -156,7 +157,6 @@
 		if (Module['webbarUnitState']) Module['webbarUnitState'](HEAPU8.slice($0, $0 + $1).buffer);
 	}, packet.data(), packet.size());
 	PublishWebbarShields();
-	PublishWebbarCloak();
 	webbarWorkAudio::Publish();
 	PublishWebbarWorld();
 	PublishWebbarResurrection();