diff --git a/internal/brainactivity/client.go b/internal/brainactivity/client.go
new file mode 100644
index 0000000..fb16e0a
--- /dev/null
+++ b/internal/brainactivity/client.go
@@ -0,0 +1,90 @@
+package brainactivity
+
+import (
+	"bytes"
+	"encoding/json"
+	"net/http"
+	"os"
+	"strings"
+	"sync"
+	"time"
+)
+
+type Hit struct {
+	ID    string  `json:"id"`
+	Score float64 `json:"score,omitempty"`
+}
+
+type event struct {
+	Type     string         `json:"type"`
+	Source   string         `json:"source"`
+	Query    string         `json:"query,omitempty"`
+	Message  string         `json:"message,omitempty"`
+	Hits     []Hit          `json:"hits,omitempty"`
+	Metadata map[string]any `json:"metadata,omitempty"`
+}
+
+var sender = newSender()
+
+type asyncSender struct {
+	once sync.Once
+	url  string
+	key  string
+	ch   chan event
+	http *http.Client
+}
+
+func newSender() *asyncSender {
+	return &asyncSender{ch: make(chan event, 128), http: &http.Client{Timeout: 3 * time.Second}}
+}
+
+// EmitSearch is fail-open and has no effect unless BRAIN_ACTIVITY_URL is set.
+// It never blocks the ticket-processing path and silently drops telemetry when
+// the optional visualization is unavailable or the local queue is full.
+func EmitSearch(source, query string, hits []Hit, duration time.Duration) {
+	sender.once.Do(sender.start)
+	if sender.url == "" {
+		return
+	}
+	query = strings.TrimSpace(query)
+	if len([]rune(query)) > 4000 {
+		query = string([]rune(query)[:4000])
+	}
+	e := event{
+		Type: "knowledge.search", Source: source, Query: query,
+		Message: "Wissenssuche aus " + source,
+		Hits:    hits, Metadata: map[string]any{"duration_ms": duration.Milliseconds(), "result_count": len(hits)},
+	}
+	select {
+	case sender.ch <- e:
+	default:
+	}
+}
+
+func (s *asyncSender) start() {
+	s.url = strings.TrimSpace(os.Getenv("BRAIN_ACTIVITY_URL"))
+	s.key = strings.TrimSpace(os.Getenv("BRAIN_ACTIVITY_API_KEY"))
+	if s.url == "" {
+		return
+	}
+	go func() {
+		for e := range s.ch {
+			b, err := json.Marshal(e)
+			if err != nil {
+				continue
+			}
+			req, err := http.NewRequest(http.MethodPost, s.url, bytes.NewReader(b))
+			if err != nil {
+				continue
+			}
+			req.Header.Set("Content-Type", "application/json")
+			if s.key != "" {
+				req.Header.Set("Authorization", "Bearer "+s.key)
+			}
+			resp, err := s.http.Do(req)
+			if err == nil {
+				_ = resp.Body.Close()
+			}
+		}
+	}()
+}
diff --git a/internal/knowledge/store.go b/internal/knowledge/store.go
index 5c762c8..0c186a1 100644
--- a/internal/knowledge/store.go
+++ b/internal/knowledge/store.go
@@ -17,6 +17,7 @@ import (
 	"time"
 	"unicode"
 
+	"github.com/example/glpi-ai-agent/internal/brainactivity"
 	"github.com/example/glpi-ai-agent/internal/model"
 )
 
@@ -1073,6 +1074,7 @@ func safeID(v string) bool {
 // are scored separately. Missing metadata does not lower a document's score:
 // the weights of available components are normalized dynamically.
 func (s *Store) Search(ctx context.Context, text string, topK int, categorySets ...[]model.Category) ([]model.KnowledgeHit, error) {
+	startedAt := time.Now()
 	if s == nil {
 		return nil, fmt.Errorf("knowledge store is not initialized")
 	}
@@ -1191,6 +1193,11 @@ func (s *Store) Search(ctx context.Context, text string, topK int, categorySets
 	if topK > 0 && len(hits) > topK {
 		hits = hits[:topK]
 	}
+	activityHits := make([]brainactivity.Hit, 0, len(hits))
+	for _, hit := range hits {
+		activityHits = append(activityHits, brainactivity.Hit{ID: hit.Doc.ID, Score: hit.Score})
+	}
+	brainactivity.EmitSearch("agent", text, activityHits, time.Since(startedAt))
 	return hits, nil
 }