diff --git a/gql.go b/gql.go
index 683726c..0fff0be 100644
--- a/gql.go
+++ b/gql.go
@@ -181,7 +181,7 @@ func ExtractID(p graphql.ResolveParams, name string) (NodeID, error) {
   return id, nil
 }
 
-func GraphiQLHandler() func(http.ResponseWriter, *http.Request) {
+func GraphiQLHandler(auth_token string) func(http.ResponseWriter, *http.Request) {
   return func(w http.ResponseWriter, r * http.Request) {
     graphiql_string := fmt.Sprintf(`
     <!--
@@ -240,6 +240,9 @@ func GraphiQLHandler() func(http.ResponseWriter, *http.Request) {
       React.createElement(GraphiQL, {
         fetcher: GraphiQL.createFetcher({
           url: '/gql',
+          headers: {
+            "Authorization": "Basic %s",
+          },
         }),
         defaultEditorToolsVisibility: true,
       }),
@@ -247,7 +250,7 @@ func GraphiQLHandler() func(http.ResponseWriter, *http.Request) {
     </script>
     </body>
     </html>
-    `)
+    `, auth_token)
 
     w.Header().Set("Content-Type", "text/html; charset=utf-8")
     w.WriteHeader(http.StatusOK)
@@ -1436,7 +1439,11 @@ func (ext *GQLExt) StartGQLServer(ctx *Context, node *Node) error {
   mux.HandleFunc("/gqlws", GQLWSHandler(ctx, node, ext))
 
   // Server a graphiql interface(TODO make configurable whether to start this)
-  mux.HandleFunc("/graphiql", GraphiQLHandler())
+  auth_header, err := AuthorizationHeader(node)
+  if err != nil {
+    return err
+  }
+  mux.HandleFunc("/graphiql", GraphiQLHandler(auth_header))
 
   // Server the ./site directory to /site (TODO make configurable with better defaults)
   fs := http.FileServer(http.Dir("./site"))
diff --git a/gql_signal.go b/gql_signal.go
new file mode 100644
index 0000000..ebc0818
--- /dev/null
+++ b/gql_signal.go
@@ -0,0 +1,193 @@
+package graphvent
+
+import (
+  graphql "github.com/graphql-go/graphql"
+  "reflect"
+  "fmt"
+  "time"
+)
+
+type GQLTypeInfo struct {
+  graphql.Type
+  FromGQL func(interface{})(reflect.Value, error)
+}
+
+var kind_gql_map = map[reflect.Kind]GQLTypeInfo{
+  reflect.String: {
+    graphql.String,
+    func(value interface{})(reflect.Value, error) {
+      return reflect.ValueOf(value), nil
+    },
+  },
+  reflect.Bool: {
+    graphql.Boolean,
+    func(value interface{})(reflect.Value, error) {
+      return reflect.ValueOf(value), nil
+    },
+  },
+}
+
+var type_gql_map = map[reflect.Type]GQLTypeInfo{
+  reflect.TypeOf(&NodeID{}): {
+    graphql.String,
+    func(value interface{}) (reflect.Value, error) {
+      str, ok := value.(string)
+      if ok == false {
+        return reflect.Value{}, fmt.Errorf("value is not string")
+      }
+
+      if str == "" {
+        return reflect.New(reflect.TypeOf(NodeID{})), nil
+      }
+
+      id_parsed, err := ParseID(str)
+      if err != nil {
+        return reflect.Value{}, err
+      }
+
+      return reflect.ValueOf(&id_parsed), nil
+    },
+  },
+  reflect.TypeOf(NodeID{}): {
+    graphql.String,
+    func(value interface{})(reflect.Value, error) {
+      str, ok := value.(string)
+      if ok == false {
+        return reflect.Value{}, fmt.Errorf("value is not string")
+      }
+
+      id_parsed, err := ParseID(str)
+      if err != nil {
+        return reflect.Value{}, err
+      }
+
+      return reflect.ValueOf(id_parsed), nil
+    },
+  },
+}
+
+type StructFieldInfo struct {
+  Name string
+  Type reflect.Type
+  GQL *GQLTypeInfo
+  Index []int
+}
+
+func SignalFromArgs(signal_type reflect.Type, fields []StructFieldInfo, args map[string]interface{}) (Signal, error) {
+  signal_value := reflect.New(signal_type)
+  for _, field := range(fields) {
+    arg, arg_exists := args[field.Name]
+    if arg_exists == false {
+      return nil, fmt.Errorf("No arg provided named %s", field.Name)
+    }
+    field_value := signal_value.Elem().FieldByIndex(field.Index)
+    if field_value.CanConvert(field.Type) == false {
+      return nil, fmt.Errorf("Arg %s wrong type %s/%s", field.Name, field_value.Type(), field.Type)
+    }
+    value, err := field.GQL.FromGQL(arg)
+    if err != nil {
+      return nil, err
+    }
+    field_value.Set(value)
+  }
+  return signal_value.Interface().(Signal), nil
+}
+
+func (ext *GQLExtContext) AddSignalMutation(name string, send_id_key string, signal_type reflect.Type) error {
+  args := graphql.FieldConfigArgument{}
+  arg_info := []StructFieldInfo{}
+
+  for _, field := range(reflect.VisibleFields(signal_type)) {
+    gv_tag, tagged_gv := field.Tag.Lookup("gv")
+    if tagged_gv {
+      if gv_tag == "id" {
+        continue
+      }
+      if gv_tag == "direction" {
+        continue
+      }
+      _, exists := args[gv_tag]
+      if exists == true {
+        return fmt.Errorf("Signal has repeated tag %s", gv_tag)
+      }
+      var gql_info GQLTypeInfo
+      var type_mapped bool
+      gql_info, type_mapped = type_gql_map[field.Type]
+      if type_mapped == false {
+        var kind_mapped bool
+        gql_info, kind_mapped = kind_gql_map[field.Type.Kind()]
+        if kind_mapped == false {
+          return fmt.Errorf("Signal has unsupported type/kind: %s/%s", field.Type, field.Type.Kind())
+        }
+      }
+
+      args[gv_tag] = &graphql.ArgumentConfig{
+        Type: gql_info.Type,
+      }
+      arg_info = append(arg_info, StructFieldInfo{
+        gv_tag,
+        field.Type,
+        &gql_info,
+        field.Index,
+      })
+    }
+  }
+
+  _, send_exists := args[send_id_key]
+  if send_exists == false {
+    args[send_id_key] = &graphql.ArgumentConfig{
+      Type: graphql.String,
+    }
+  }
+
+  resolve_signal := func(p graphql.ResolveParams) (interface{}, error) {
+    ctx, err := PrepResolve(p)
+    if err != nil {
+      return nil, err
+    }
+
+    send_id, err := ExtractID(p, send_id_key)
+    if err != nil {
+      return nil, err
+    }
+
+    signal, err := SignalFromArgs(signal_type, arg_info, p.Args)
+    if err != nil {
+      return nil, err
+    }
+    msgs := Messages{}
+    msgs = msgs.Add(ctx.Context, ctx.User, ctx.Key, signal, send_id)
+
+    response_chan := ctx.Ext.GetResponseChannel(signal.ID())
+    err = ctx.Context.Send(msgs)
+    if err != nil {
+      ctx.Ext.FreeResponseChannel(signal.ID())
+      return nil, err
+    }
+
+    response, err := WaitForResponse(response_chan, 100*time.Millisecond, signal.ID())
+    if err != nil {
+      ctx.Ext.FreeResponseChannel(signal.ID())
+      return nil, err
+    }
+
+    _, is_success := response.(*SuccessSignal)
+    if is_success == true {
+      return "success", nil
+    }
+
+    error_response, is_error := response.(*ErrorSignal)
+    if is_error == true {
+      return "error", fmt.Errorf(error_response.Error)
+    }
+
+    return nil, fmt.Errorf("response of unhandled type %s", reflect.TypeOf(response))
+  }
+
+  ext.Mutation.AddFieldConfig(name, &graphql.Field{
+    Type: graphql.String,
+    Args: args,
+    Resolve: resolve_signal,
+  })
+  return nil
+}