diff --git a/internal/skills/brain/handlers.go b/internal/skills/brain/handlers.go
index f92a99a..fb7584e 100644
--- a/internal/skills/brain/handlers.go
+++ b/internal/skills/brain/handlers.go
@@ -56,10 +56,7 @@ func (s *Skill) write(ctx context.Context, args json.RawMessage) (json.RawMessag
 	if a.Content == "" {
 		return nil, fmt.Errorf("content is required")
 	}
-	return s.post(ctx, "/write", map[string]string{
-		"content":  a.Content,
-		"filename": a.Filename,
-	})
+	return s.post(ctx, "/write", a)
 }
 
 func (s *Skill) post(ctx context.Context, path string, body any) (json.RawMessage, error) {
diff --git a/internal/skills/brain/handlers_test.go b/internal/skills/brain/handlers_test.go
index 7d87d54..7df6028 100644
--- a/internal/skills/brain/handlers_test.go
+++ b/internal/skills/brain/handlers_test.go
@@ -41,6 +41,10 @@ func TestHandle_BrainQuery_CallsIngestServer(t *testing.T) {
 func TestHandle_BrainWrite_CallsIngestServer(t *testing.T) {
 	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		assert.Equal(t, "/write", r.URL.Path)
+		var body map[string]string
+		require.NoError(t, json.NewDecoder(r.Body).Decode(&body))
+		assert.Equal(t, "concept", body["type"])
+		assert.Equal(t, "# Test\n\nSome learning.", body["content"])
 		json.NewEncoder(w).Encode(map[string]string{"path": "raw/test.md"})
 	}))
 	defer srv.Close()