diff --git a/router/router.py b/router/router.py
index 0b7449d..85c59e8 100644
--- a/router/router.py
+++ b/router/router.py
@@ -324,8 +324,11 @@ def chat():
                     if raw: yield clean_unicode(raw)
             bcast()
             ctx_remaining = GPU_CONTEXT.get(model, 65536) - max(session_tokens, estimate_tokens(rd.get("messages",[])))
+            ctx_pct = ctx_remaining / GPU_CONTEXT.get(model, 65536) * 100
+            ctx_warning = "compact_urgent" if ctx_pct < 5 else ("compact_recommended" if ctx_pct < 15 else ("compact_soon" if ctx_pct < 30 else "ok"))
             sse_resp = Response(stream_with_context(gen()), mimetype="text/event-stream")
             sse_resp.headers["X-Context-Remaining"] = str(max(0, ctx_remaining))
+            sse_resp.headers["X-Context-Warning"] = ctx_warning
             sse_resp.headers["X-Context-Model"] = model
             return sse_resp
         data = clean_response(resp.json())
@@ -334,9 +337,12 @@ def chat():
             if not msg.get("content") and msg.get("reasoning_content"):
                 msg["content"] = msg["reasoning_content"]
         ctx_remaining = GPU_CONTEXT.get(model, 65536) - max(session_tokens, estimate_tokens(rd.get("messages",[])))
-        data["routing"] = {"model":model,"reason":reason,"gpu":url,"tier":tier,"agent":agent,"latency_ms":lat,"active_gpu":gpu_active_count(model),"context_remaining": max(0, ctx_remaining)}
+        ctx_pct = ctx_remaining / GPU_CONTEXT.get(model, 65536) * 100
+        ctx_warning = "compact_urgent" if ctx_pct < 5 else ("compact_recommended" if ctx_pct < 15 else ("compact_soon" if ctx_pct < 30 else "ok"))
+        data["routing"] = {"model":model,"reason":reason,"gpu":url,"tier":tier,"agent":agent,"latency_ms":lat,"active_gpu":gpu_active_count(model),"context_remaining": max(0, ctx_remaining),"context_pct": round(ctx_pct,1),"context_warning": ctx_warning}
         resp = jsonify(data)
         resp.headers["X-Context-Remaining"] = str(max(0, ctx_remaining))
+        resp.headers["X-Context-Warning"] = ctx_warning
         resp.headers["X-Context-Model"] = model
         bcast()
         return resp