diff --git a/pkg/agent/core/ngt/handler/grpc/linear_search.go b/pkg/agent/core/ngt/handler/grpc/linear_search.go
index e1f9fca49f..d66f74e9d0 100644
--- a/pkg/agent/core/ngt/handler/grpc/linear_search.go
+++ b/pkg/agent/core/ngt/handler/grpc/linear_search.go
@@ -23,7 +23,6 @@ import (
 	"github.com/vdaas/vald/internal/info"
 	"github.com/vdaas/vald/internal/log"
 	"github.com/vdaas/vald/internal/net/grpc"
-	"github.com/vdaas/vald/internal/net/grpc/codes"
 	"github.com/vdaas/vald/internal/net/grpc/errdetails"
 	"github.com/vdaas/vald/internal/net/grpc/status"
 	"github.com/vdaas/vald/internal/observability/attribute"
diff --git a/pkg/agent/core/ngt/handler/grpc/remove.go b/pkg/agent/core/ngt/handler/grpc/remove.go
index 14f78aa22f..2d3ec18b10 100644
--- a/pkg/agent/core/ngt/handler/grpc/remove.go
+++ b/pkg/agent/core/ngt/handler/grpc/remove.go
@@ -23,7 +23,6 @@ import (
 	"github.com/vdaas/vald/internal/info"
 	"github.com/vdaas/vald/internal/log"
 	"github.com/vdaas/vald/internal/net/grpc"
-	"github.com/vdaas/vald/internal/net/grpc/codes"
 	"github.com/vdaas/vald/internal/net/grpc/errdetails"
 	"github.com/vdaas/vald/internal/net/grpc/status"
 	"github.com/vdaas/vald/internal/observability/attribute"
diff --git a/pkg/agent/core/ngt/handler/grpc/search.go b/pkg/agent/core/ngt/handler/grpc/search.go
index b438a01a91..119a4bc727 100644
--- a/pkg/agent/core/ngt/handler/grpc/search.go
+++ b/pkg/agent/core/ngt/handler/grpc/search.go
@@ -23,7 +23,6 @@ import (
 	"github.com/vdaas/vald/internal/info"
 	"github.com/vdaas/vald/internal/log"
 	"github.com/vdaas/vald/internal/net/grpc"
-	"github.com/vdaas/vald/internal/net/grpc/codes"
 	"github.com/vdaas/vald/internal/net/grpc/errdetails"
 	"github.com/vdaas/vald/internal/net/grpc/status"
 	"github.com/vdaas/vald/internal/observability/attribute"
diff --git a/pkg/agent/core/ngt/handler/grpc/update.go b/pkg/agent/core/ngt/handler/grpc/update.go
index b1cc7b433b..a38307654c 100644
--- a/pkg/agent/core/ngt/handler/grpc/update.go
+++ b/pkg/agent/core/ngt/handler/grpc/update.go
@@ -23,7 +23,6 @@ import (
 	"github.com/vdaas/vald/internal/info"
 	"github.com/vdaas/vald/internal/log"
 	"github.com/vdaas/vald/internal/net/grpc"
-	"github.com/vdaas/vald/internal/net/grpc/codes"
 	"github.com/vdaas/vald/internal/net/grpc/errdetails"
 	"github.com/vdaas/vald/internal/net/grpc/status"
 	"github.com/vdaas/vald/internal/observability/attribute"
diff --git a/pkg/agent/core/ngt/handler/grpc/upsert.go b/pkg/agent/core/ngt/handler/grpc/upsert.go
index 18ebd37d3c..6c75e4ecec 100644
--- a/pkg/agent/core/ngt/handler/grpc/upsert.go
+++ b/pkg/agent/core/ngt/handler/grpc/upsert.go
@@ -20,7 +20,6 @@ import (
 	"github.com/vdaas/vald/apis/grpc/v1/payload"
 	"github.com/vdaas/vald/apis/grpc/v1/vald"
 	"github.com/vdaas/vald/internal/errors"
-	"github.com/vdaas/vald/internal/info"
 	"github.com/vdaas/vald/internal/log"
 	"github.com/vdaas/vald/internal/net/grpc"
 	"github.com/vdaas/vald/internal/net/grpc/codes"
@@ -28,7 +27,6 @@ import (
 	"github.com/vdaas/vald/internal/net/grpc/status"
 	"github.com/vdaas/vald/internal/observability/trace"
 	"github.com/vdaas/vald/internal/safety"
-	"github.com/vdaas/vald/internal/strings"
 	"github.com/vdaas/vald/internal/sync"
 )