diff --git a/hkt/main.go b/hkt/main.go
index 21d2a71..c7402e9 100644
--- a/hkt/main.go
+++ b/hkt/main.go
@@ -7,6 +7,7 @@ import (
 	"os/signal"
 
 	"hookt.dev/cmd/pkg/command"
+	"hookt.dev/cmd/pkg/errors"
 	"hookt.dev/cmd/pkg/trace"
 
 	"github.com/spf13/cobra"
@@ -68,7 +69,12 @@ func newRunCommand(ctx context.Context, app *command.App) *cobra.Command {
 				ctx = trace.WithSchedule(ctx, trace.LogSchedule())
 			}
 
-			s, err := app.Engine.Run(ctx, files[0])
+			p, err := os.ReadFile(files[0])
+			if err != nil {
+				return errors.New("failed to read file: %w", err)
+			}
+
+			s, err := app.Engine.Run(ctx, p)
 			if s != nil && len(s.Events) != 0 {
 				app.Render(s.Results())
 			}
diff --git a/pkg/hookt/engine.go b/pkg/hookt/engine.go
index 286c32c..315bd76 100644
--- a/pkg/hookt/engine.go
+++ b/pkg/hookt/engine.go
@@ -3,16 +3,16 @@ package hookt
 import (
 	"context"
 	"log/slog"
-	"os"
 	"strconv"
 
-	"github.com/lmittmann/tint"
-	"golang.org/x/sync/errgroup"
 	"hookt.dev/cmd/pkg/check"
 	"hookt.dev/cmd/pkg/errors"
 	"hookt.dev/cmd/pkg/plugin/builtin"
 	"hookt.dev/cmd/pkg/proto"
 	"hookt.dev/cmd/pkg/trace"
+
+	"github.com/lmittmann/tint"
+	"golang.org/x/sync/errgroup"
 )
 
 var plugins []proto.Interface
@@ -39,12 +39,7 @@ func New(opts ...func(*Engine)) *Engine {
 	return ngn
 }
 
-func (e *Engine) Run(ctx context.Context, file string) (*check.S, error) {
-	p, err := os.ReadFile(file)
-	if err != nil {
-		return nil, errors.New("failed to read file: %w", err)
-	}
-
+func (e *Engine) Run(ctx context.Context, p []byte) (*check.S, error) {
 	var s check.S
 
 	ctx = trace.WithPattern(ctx, trace.ContextPattern(ctx).Join(s.Trace()))
diff --git a/pkg/hookt/options.go b/pkg/hookt/options.go
index 6963c26..81531ab 100644
--- a/pkg/hookt/options.go
+++ b/pkg/hookt/options.go
@@ -1,6 +1,9 @@
 package hookt
 
-func With() func(*Engine) {
+import "hookt.dev/cmd/pkg/proto"
+
+func WithProtoOptions(opts ...func(*proto.P)) func(*Engine) {
 	return func(e *Engine) {
+		e.p = e.p.With(opts...)
 	}
 }
diff --git a/pkg/proto/proto.go b/pkg/proto/proto.go
index b367254..c7fb5a7 100644
--- a/pkg/proto/proto.go
+++ b/pkg/proto/proto.go
@@ -50,6 +50,10 @@ func New(opts ...func(*P)) *P {
 		t: NewT(),
 		m: make(map[string]Interface),
 	}
+	return p.With(opts...)
+}
+
+func (p *P) With(opts ...func(*P)) *P {
 	for _, opt := range opts {
 		opt(p)
 	}