diff --git a/client/README.md b/client/README.md
index 3f8325a..333b82e 100644
--- a/client/README.md
+++ b/client/README.md
@@ -82,7 +82,7 @@ If the server is **down**, boot **`GET`** fails silently (check Output for warni
 
 On boot, **`InteractablesCatalogClient`** **`GET`s** **`/game/world/interactables`**; **`interactable_world_builder.gd`** spawns **walkable** prototype props plus **two** small glow markers per row under **`World/InteractionMarkers`**. **`interaction_radius_indicators.gd`** compares the snapped **`CharacterBody3D`** **`global_position`** to each descriptor’s **`anchor`** on **X/Z** with the same **`interactionRadius`** and inclusive **`<=`** rule as the server — **preview only**; **`POST /game/players/{id}/interact`** remains authoritative.
 
-- **`InteractionRequestClient`**: **`interact`** (**E**) → **`prototype_terminal`**; **`interact_secondary`** (**R**) → **`prototype_resource_node_alpha`** (stable ids; must match `PrototypeInteractableRegistry.cs`). **Output** prints `allowed` / `reasonCode`. In-flight requests are ignored (same busy pattern as **`PositionAuthorityClient`**).
+- **`InteractionRequestClient`**: **`interact`** (**E**) → **`prototype_terminal`**; **`interact_secondary`** (**R**) → **`prototype_resource_node_alpha`** (stable ids; must match `PrototypeInteractableRegistry.cs`). **Output** prints `allowed` / `reasonCode` per response (lines prefixed with `Interaction [<id>]: …`). Only one HTTP POST runs at a time; if you press **E** then **R** while the first request is still in flight, the **latest** id is remembered and sent **immediately after** the first completes (last-wins coalescing — not a silent drop).
 - **Inspector:** match **`base_url`** on **`InteractablesCatalogClient`**, **`InteractionRequestClient`**, and **`PositionAuthorityClient`** to the running server.
 - **No server:** catalog **GET** fails → **Output** errors; props and glow markers do not spawn (expected prototype degradation).
 
diff --git a/client/scripts/interaction_request_client.gd b/client/scripts/interaction_request_client.gd
index 60f9f8d..85aebec 100644
--- a/client/scripts/interaction_request_client.gd
+++ b/client/scripts/interaction_request_client.gd
@@ -16,6 +16,10 @@ const ID_RESOURCE_NODE := "prototype_resource_node_alpha"
 
 var _http: Node
 var _busy: bool = false
+## While an HTTP POST is in flight, the latest [code]interactableId[/code] from a new press overwrites
+## this slot (last wins); [method _try_flush_pending] runs the next POST after [signal HTTPRequest.request_completed].
+var _pending_interactable_id: String = ""
+var _current_interactable_id: String = ""
 
 
 func _ready() -> void:
@@ -44,7 +48,13 @@ func _base_root() -> String:
 
 func _post_interact(interactable_id: String) -> void:
 	if _busy:
+		_pending_interactable_id = interactable_id
 		return
+	_start_post(interactable_id)
+
+
+func _start_post(interactable_id: String) -> void:
+	_current_interactable_id = interactable_id
 	_busy = true
 	var url := "%s/game/players/%s/interact" % [_base_root(), dev_player_id.strip_edges()]
 	var payload := {"schemaVersion": 1, "interactableId": interactable_id}
@@ -54,6 +64,14 @@ func _post_interact(interactable_id: String) -> void:
 	if err != OK:
 		push_warning("InteractionRequestClient: POST failed to start (%s)" % err)
 		_busy = false
+		_try_flush_pending()
+
+
+func _try_flush_pending() -> void:
+	var next: String = _pending_interactable_id
+	_pending_interactable_id = ""
+	if not next.is_empty() and not _busy:
+		_start_post(next)
 
 
 func _on_request_completed(
@@ -61,6 +79,7 @@ func _on_request_completed(
 ) -> void:
 	_busy = false
 	var text := body.get_string_from_utf8()
+	var id_echo: String = _current_interactable_id
 	if response_code == 200:
 		var parsed: Variant = JSON.parse_string(text)
 		if parsed is Dictionary:
@@ -68,8 +87,14 @@ func _on_request_completed(
 			var allowed: bool = bool(d.get("allowed", false))
 			var reason: Variant = d.get("reasonCode", null)
 			if allowed:
-				print("Interaction: allowed=true (reasonCode omitted on success)")
+				print(
+					"Interaction [%s]: allowed=true (reasonCode omitted on success)" % id_echo
+				)
 			else:
-				print("Interaction: allowed=false reasonCode=%s" % str(reason))
+				print(
+					"Interaction [%s]: allowed=false reasonCode=%s" % [id_echo, str(reason)]
+				)
+			_try_flush_pending()
 			return
-	print("Interaction: HTTP %s body=%s" % [response_code, text])
+	print("Interaction [%s]: HTTP %s body=%s" % [id_echo, response_code, text])
+	_try_flush_pending()