From 1f5e68abe6ad7e9c3fed39cc38e2c888e81e491a Mon Sep 17 00:00:00 2001
From: Bryan Frimin <bryan@getprobo.com>
Date: Fri, 13 Mar 2026 19:34:07 +0100
Subject: [PATCH] Fix typeName panic for interface type parameters

reflect.TypeOf on a nil interface value returns nil, causing a
panic when Kind() is called. Use reflect.TypeFor[T]() instead,
which resolves the type directly from the type parameter.

Signed-off-by: Bryan Frimin <bryan@getprobo.com>
---
 pkg/agent/typed.go      |  3 +--
 pkg/agent/typed_test.go | 18 ++++++++++++++++++
 2 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/pkg/agent/typed.go b/pkg/agent/typed.go
index ee8e81b9c..47edd52f0 100644
--- a/pkg/agent/typed.go
+++ b/pkg/agent/typed.go
@@ -69,8 +69,7 @@ func RunTyped[T any](
 }
 
 func typeName[T any]() string {
-	var zero T
-	t := reflect.TypeOf(zero)
+	t := reflect.TypeFor[T]()
 	if t.Kind() == reflect.Pointer {
 		t = t.Elem()
 	}
diff --git a/pkg/agent/typed_test.go b/pkg/agent/typed_test.go
index c81f8939e..48d513de7 100644
--- a/pkg/agent/typed_test.go
+++ b/pkg/agent/typed_test.go
@@ -120,6 +120,24 @@ func TestTypeName(t *testing.T) {
 			assert.Equal(t, "status", typeName[Status]())
 		},
 	)
+
+	t.Run(
+		"any interface returns output",
+		func(t *testing.T) {
+			t.Parallel()
+
+			assert.Equal(t, "output", typeName[any]())
+		},
+	)
+
+	t.Run(
+		"named interface returns lowercased name",
+		func(t *testing.T) {
+			t.Parallel()
+
+			assert.Equal(t, "error", typeName[error]())
+		},
+	)
 }
 
 func TestRunTyped(t *testing.T) {