diff --git a/sentry.c b/sentry.c
index 19f8eba..4a450f2 100644
--- a/sentry.c
+++ b/sentry.c
@@ -150,6 +150,7 @@ static zend_string *sentry_str_end_time;
 static zend_string *sentry_str_duration;
 static zend_string *sentry_str_metadata;
 static zend_string *sentry_str_exception;
+static zend_string *sentry_str_attributes;
 
 static bool sentry_array_is_list(const zend_array *array) {
 #if PHP_VERSION_ID >= 80100
@@ -247,7 +248,7 @@ static void sentry_clear_pending_exception(void) {
 
 static bool sentry_is_attribute_arg(zend_string *name, zval *value) {
     return name != NULL
-        && zend_string_equals_literal(name, "attributes")
+        && zend_string_equals(name, sentry_str_attributes)
         && Z_TYPE_P(value) == IS_ARRAY;
 }
 
@@ -554,17 +555,51 @@ static zend_string *sentry_build_key(zend_string *class_name, zend_string *funct
     return sentry_join_class_function(class_name, function_name, /* lowercase */ true);
 }
 
+static void sentry_set_processing_callback(
+    zval *target,
+    zval *argument,
+    const char *argument_name,
+    zend_string *class_name,
+    zend_string *function_name
+) {
+    if (argument == NULL || Z_TYPE_P(argument) == IS_NULL) {
+        return;
+    }
+
+    if (!zend_is_callable(argument, 0, NULL)) {
+        zend_string *display_name = sentry_build_display_name(class_name, function_name);
+        sentry_emit_logf(
+            SENTRY_LOG_WARNING,
+            "Sentry instrumentation argument \"%s\" for '%s' is not a valid callback and was ignored.",
+            argument_name,
+            ZSTR_VAL(display_name)
+        );
+        zend_string_release(display_name);
+        return;
+    }
+
+    ZVAL_COPY(target, argument);
+}
+
 ZEND_FUNCTION(Sentry_instrument) {
     zend_string *class_name = NULL;
     zend_string *function_name;
 
+    zval *preprocessing_arg = NULL;
+    zval *postprocessing_arg = NULL;
+    zval *attributes_arg = NULL;
+
     zval *metadata_args = NULL;
     uint32_t metadata_argc = 0;
     HashTable *named_metadata = NULL;
 
-    ZEND_PARSE_PARAMETERS_START(2,-1)
-        Z_PARAM_STR_OR_NULL(class_name)
+    ZEND_PARSE_PARAMETERS_START(1,-1)
         Z_PARAM_STR(function_name)
+        Z_PARAM_OPTIONAL
+        Z_PARAM_STR_OR_NULL(class_name)
+        Z_PARAM_ZVAL(preprocessing_arg)
+        Z_PARAM_ZVAL(postprocessing_arg)
+        Z_PARAM_ZVAL(attributes_arg)
         Z_PARAM_VARIADIC_WITH_NAMED(metadata_args, metadata_argc, named_metadata)
     ZEND_PARSE_PARAMETERS_END();
 
@@ -607,6 +642,30 @@ ZEND_FUNCTION(Sentry_instrument) {
     zval attribute_list;
     ZVAL_UNDEF(&attribute_list);
 
+    sentry_set_processing_callback(
+        &preprocessing_callback,
+        preprocessing_arg,
+        SENTRY_PREPROCESSING_ARG,
+        class_name,
+        function_name
+    );
+    sentry_set_processing_callback(
+        &postprocessing_callback,
+        postprocessing_arg,
+        SENTRY_POSTPROCESSING_ARG,
+        class_name,
+        function_name
+    );
+
+    if (attributes_arg != NULL) {
+        sentry_add_named_metadata_arg(
+            &metadata,
+            &attribute_list,
+            sentry_str_attributes,
+            attributes_arg
+        );
+    }
+
     for (uint32_t i = 0; i < metadata_argc; i++) {
         if (Z_TYPE(metadata_args[i]) == IS_ARRAY) {
             sentry_merge_array(&metadata, &metadata_args[i]);
@@ -618,32 +677,6 @@ ZEND_FUNCTION(Sentry_instrument) {
         zval *value;
 
         ZEND_HASH_FOREACH_STR_KEY_VAL(named_metadata, name, value) {
-            zval *callback_target = NULL;
-
-            if (name != NULL) {
-                if (zend_string_equals_literal(name, SENTRY_PREPROCESSING_ARG)) {
-                    callback_target = &preprocessing_callback;
-                } else if (zend_string_equals_literal(name, SENTRY_POSTPROCESSING_ARG)) {
-                    callback_target = &postprocessing_callback;
-                }
-            }
-
-            if (callback_target != NULL) {
-                if (!zend_is_callable(value, 0, NULL)) {
-                    zend_string *display_name = sentry_build_display_name(class_name, function_name);
-                    sentry_emit_logf(
-                        SENTRY_LOG_WARNING,
-                        "Sentry instrumentation argument \"%s\" for '%s' is not a valid callback and was ignored.",
-                        ZSTR_VAL(name),
-                        ZSTR_VAL(display_name)
-                    );
-                    zend_string_release(display_name);
-                    continue;
-                }
-                ZVAL_COPY(callback_target, value);
-                continue;
-            }
-
             if (name != NULL) {
                 sentry_add_named_metadata_arg(
                     &metadata,
@@ -1237,6 +1270,7 @@ PHP_MINIT_FUNCTION(sentry) {
     sentry_str_duration = zend_string_init_interned("duration", sizeof("duration") - 1, 1);
     sentry_str_metadata = zend_string_init_interned("metadata", sizeof("metadata") - 1, 1);
     sentry_str_exception = zend_string_init_interned("exception", sizeof("exception") - 1, 1);
+    sentry_str_attributes = zend_string_init_interned("attributes",sizeof("attributes") - 1,1);
 
     sentry_register_log_constants(module_number);
 
diff --git a/sentry.stub.php b/sentry.stub.php
index 1f6f983..76b8ef4 100644
--- a/sentry.stub.php
+++ b/sentry.stub.php
@@ -12,9 +12,17 @@
     const LOG_WARNING = 300;
     const LOG_ERROR = 400;
 
+    /**
+     * @phpstan-param callable(mixed...): mixed $preprocessing
+     * @phpstan-param callable(mixed): mixed $postprocessing
+     * @phpstan-param array<string, mixed> $attributes
+     */
     function instrument(
-        ?string $className,
-        string $functionName,
+        string $function,
+        ?string $class = null,
+        ?callable $preprocessing = null,
+        ?callable $postprocessing = null,
+        array $attributes = [],
         mixed ...$metadata
     ): bool {}
 
diff --git a/sentry_arginfo.h b/sentry_arginfo.h
index f773187..4deaa53 100644
--- a/sentry_arginfo.h
+++ b/sentry_arginfo.h
@@ -1,9 +1,12 @@
 /* This is a generated file, edit the .stub.php file instead.
- * Stub hash: 9b2b12d671b0ee55aa239014f8d8c702e5b5e260 */
-
-ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_Sentry_instrument, 0, 2, _IS_BOOL, 0)
-	ZEND_ARG_TYPE_INFO(0, className, IS_STRING, 1)
-	ZEND_ARG_TYPE_INFO(0, functionName, IS_STRING, 0)
+ * Stub hash: 472327fee6b02cd5e40ed2f0cddf6971d92514ce */
+
+ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_Sentry_instrument, 0, 1, _IS_BOOL, 0)
+	ZEND_ARG_TYPE_INFO(0, function, IS_STRING, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, class, IS_STRING, 1, "null")
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, preprocessing, IS_CALLABLE, 1, "null")
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, postprocessing, IS_CALLABLE, 1, "null")
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, attributes, IS_ARRAY, 0, "[]")
 	ZEND_ARG_VARIADIC_TYPE_INFO(0, metadata, IS_MIXED, 0)
 ZEND_END_ARG_INFO()
 
diff --git a/tests/test_callback_return_value.phpt b/tests/test_callback_return_value.phpt
index e9d90bf..3923539 100644
--- a/tests/test_callback_return_value.phpt
+++ b/tests/test_callback_return_value.phpt
@@ -24,7 +24,7 @@ function test_instrumented() {
     echo $returnValue . PHP_EOL;
 }); 
 
-\Sentry\instrument(null, 'test_instrumented');
+\Sentry\instrument('test_instrumented');
 test_instrumented();
 
 ?>
diff --git a/tests/test_case_insensitive.phpt b/tests/test_case_insensitive.phpt
index 2de76f6..7d3d794 100644
--- a/tests/test_case_insensitive.phpt
+++ b/tests/test_case_insensitive.phpt
@@ -14,7 +14,7 @@ function work() {
     echo "Duration: " . $data['duration'] . PHP_EOL;
 }); 
 
-\Sentry\instrument(null, 'WoRk');
+\Sentry\instrument('WoRk');
 work();
 
 ?>
diff --git a/tests/test_cought_exceptions_do_not_leak.phpt b/tests/test_cought_exceptions_do_not_leak.phpt
index 55ec6f9..237e59c 100644
--- a/tests/test_cought_exceptions_do_not_leak.phpt
+++ b/tests/test_cought_exceptions_do_not_leak.phpt
@@ -29,8 +29,8 @@ function test_rethrow() {
     }
 }); 
 
-\Sentry\instrument(null, 'test_throw');
-\Sentry\instrument(null, 'test_rethrow');
+\Sentry\instrument('test_throw');
+\Sentry\instrument('test_rethrow');
 try {
 test_rethrow();
 } catch (Throwable $t) {
diff --git a/tests/test_duplicate_instrument.phpt b/tests/test_duplicate_instrument.phpt
index a3e1f1e..e53f570 100644
--- a/tests/test_duplicate_instrument.phpt
+++ b/tests/test_duplicate_instrument.phpt
@@ -14,9 +14,9 @@ function work() {
     echo "Duration: " . $data['duration'] . PHP_EOL;
 }); 
 
-$result = \Sentry\instrument(null, 'work');
+$result = \Sentry\instrument('work');
 echo "First result: " . ($result ? "true" : "false") . PHP_EOL;
-$result = \Sentry\instrument(null, 'work');
+$result = \Sentry\instrument('work');
 echo "Second result: " . ($result ? "true" : "false") . PHP_EOL;
 work();
 
diff --git a/tests/test_end_callback_can_be_overwritten.phpt b/tests/test_end_callback_can_be_overwritten.phpt
index c717c34..42dd708 100644
--- a/tests/test_end_callback_can_be_overwritten.phpt
+++ b/tests/test_end_callback_can_be_overwritten.phpt
@@ -18,7 +18,7 @@ class Foo {
     echo "Second callback" . PHP_EOL;
 });
 
-\Sentry\instrument("Foo", 'work', []);
+\Sentry\instrument('work', class: "Foo", attributes: []);
 (new Foo())->work();
 
 ?>
diff --git a/tests/test_exception_in_end_callback.phpt b/tests/test_exception_in_end_callback.phpt
index cc547d3..4521bae 100644
--- a/tests/test_exception_in_end_callback.phpt
+++ b/tests/test_exception_in_end_callback.phpt
@@ -13,7 +13,7 @@ function work() {
     throw new \RuntimeException("Does not break out");
 }); 
 
-\Sentry\instrument(null, 'work', ['sentry.op' => 'test']);
+\Sentry\instrument('work', attributes: ['sentry.op' => 'test']);
 work();
 
 ?>
diff --git a/tests/test_exception_in_function_and_callback.phpt b/tests/test_exception_in_function_and_callback.phpt
index f045728..adc983d 100644
--- a/tests/test_exception_in_function_and_callback.phpt
+++ b/tests/test_exception_in_function_and_callback.phpt
@@ -17,7 +17,7 @@ function work() {
     throw new \RuntimeException("callback boom");
 }); 
 
-\Sentry\instrument(null, 'work');
+\Sentry\instrument('work');
 try {
     work();
 } catch (Throwable $throwable) {
diff --git a/tests/test_exception_in_instrumented.phpt b/tests/test_exception_in_instrumented.phpt
index 8aa9103..47da2d8 100644
--- a/tests/test_exception_in_instrumented.phpt
+++ b/tests/test_exception_in_instrumented.phpt
@@ -15,7 +15,7 @@ function work() {
     echo "Metadata: " . ($data['metadata']['sentry.op'] ?? 'invalid') . PHP_EOL;
 }); 
 
-\Sentry\instrument(null, 'work', ['sentry.op' => 'test']);
+\Sentry\instrument('work', attributes: ['sentry.op' => 'test']);
 try {
     work();
 } catch (Throwable $t) {
diff --git a/tests/test_exception_in_start_callback.phpt b/tests/test_exception_in_start_callback.phpt
index 35ca8cc..73e57bb 100644
--- a/tests/test_exception_in_start_callback.phpt
+++ b/tests/test_exception_in_start_callback.phpt
@@ -13,7 +13,7 @@ function work() {
     throw new \RuntimeException("Does not break out");
 }); 
 
-\Sentry\instrument(null, 'work', ['sentry.op' => 'test']);
+\Sentry\instrument('work', attributes: ['sentry.op' => 'test']);
 work();
 
 ?>
diff --git a/tests/test_exception_set_in_end_callback.phpt b/tests/test_exception_set_in_end_callback.phpt
index 32ed6db..9359fc1 100644
--- a/tests/test_exception_set_in_end_callback.phpt
+++ b/tests/test_exception_set_in_end_callback.phpt
@@ -19,7 +19,7 @@ function test_throw() {
     echo get_class($exception) . PHP_EOL;
 }); 
 
-\Sentry\instrument(null, 'test_throw');
+\Sentry\instrument('test_throw');
 try {
 test_throw();
 } catch (Throwable $t) {
diff --git a/tests/test_fields_always_present.phpt b/tests/test_fields_always_present.phpt
index 21b5ac3..ca48384 100644
--- a/tests/test_fields_always_present.phpt
+++ b/tests/test_fields_always_present.phpt
@@ -24,7 +24,7 @@ function test_instrumented() {
     echo 'metadata: ' . get_debug_type($data['metadata']) . PHP_EOL;
 }); 
 
-\Sentry\instrument(null, 'test_instrumented');
+\Sentry\instrument('test_instrumented');
 test_instrumented();
 
 ?>
diff --git a/tests/test_function_metadata.phpt b/tests/test_function_metadata.phpt
index 3df42f1..bf1b53d 100644
--- a/tests/test_function_metadata.phpt
+++ b/tests/test_function_metadata.phpt
@@ -25,7 +25,7 @@ function test_instrumented() {
     echo "End metadata: " . ($data['metadata']['sentry.op'] ?? 'invalid') . PHP_EOL;
 }); 
 
-\Sentry\instrument(null, 'test_instrumented', ['sentry.op' => 'test']);
+\Sentry\instrument('test_instrumented', attributes: ['sentry.op' => 'test']);
 test_instrumented();
 
 ?>
diff --git a/tests/test_inheritance_correct_name.phpt b/tests/test_inheritance_correct_name.phpt
index 44e3303..ac7e3ed 100644
--- a/tests/test_inheritance_correct_name.phpt
+++ b/tests/test_inheritance_correct_name.phpt
@@ -20,7 +20,7 @@ class B extends A {
     echo "Duration: " . $data['duration'] . PHP_EOL;
 }); 
 
-\Sentry\instrument("B", "work");
+\Sentry\instrument("work", class: "B");
 
 (new B())->work();
 (new A())->work();
diff --git a/tests/test_instrument_after_first_call.phpt b/tests/test_instrument_after_first_call.phpt
index 0591b67..427783a 100644
--- a/tests/test_instrument_after_first_call.phpt
+++ b/tests/test_instrument_after_first_call.phpt
@@ -16,7 +16,7 @@ function work() {
 
 work();
 
-\Sentry\instrument(null, 'work', ['source' => 'registration']);
+\Sentry\instrument('work', attributes: ['source' => 'registration']);
 
 work();
 
diff --git a/tests/test_instrument_after_first_call_inherited.phpt b/tests/test_instrument_after_first_call_inherited.phpt
index fefddf1..f941657 100644
--- a/tests/test_instrument_after_first_call_inherited.phpt
+++ b/tests/test_instrument_after_first_call_inherited.phpt
@@ -22,7 +22,7 @@ class B extends A {
 
 (new B())->work();
 
-\Sentry\instrument("B", "work", ['source' => 'registration']);
+\Sentry\instrument("work", class: "B", attributes: ['source' => 'registration']);
 
 (new B())->work();
 (new A())->work();
diff --git a/tests/test_instrument_tolerant_explicit_params.phpt b/tests/test_instrument_tolerant_explicit_params.phpt
new file mode 100644
index 0000000..6a7f7de
--- /dev/null
+++ b/tests/test_instrument_tolerant_explicit_params.phpt
@@ -0,0 +1,32 @@
+--TEST--
+Tests that explicitly typed instrument options retain tolerant runtime behavior.
+--EXTENSIONS--
+sentry
+--FILE--
+<?php
+
+function test_instrumented() {
+}
+
+\Sentry\setLogCallback(static function (int $level, string $message) {
+    echo $level . ':' . $message . PHP_EOL;
+});
+
+\Sentry\setEndCallback(static function (array $data) {
+    echo 'attributes=' . $data['metadata']['attributes'] . PHP_EOL;
+});
+
+\Sentry\instrument(
+    function: 'test_instrumented',
+    preprocessing: 'not-callable',
+    postprocessing: 42,
+    attributes: 'kept-as-metadata',
+);
+
+test_instrumented();
+
+?>
+--EXPECT--
+300:Sentry instrumentation argument "preprocessing" for 'test_instrumented' is not a valid callback and was ignored.
+300:Sentry instrumentation argument "postprocessing" for 'test_instrumented' is not a valid callback and was ignored.
+attributes=kept-as-metadata
diff --git a/tests/test_log_callback_can_be_overwritten.phpt b/tests/test_log_callback_can_be_overwritten.phpt
index 0c62fc5..853c355 100644
--- a/tests/test_log_callback_can_be_overwritten.phpt
+++ b/tests/test_log_callback_can_be_overwritten.phpt
@@ -17,7 +17,7 @@ function test_instrumented() {
     echo $level . ":" . $message . PHP_EOL;
 });
 
-\Sentry\instrument(null, 'test_instrumented', []);
+\Sentry\instrument('test_instrumented', attributes: []);
 test_instrumented();
 
 \Sentry\setLogCallback(static function(int $level, string $message) {
diff --git a/tests/test_log_callback_crash_doesnt_log.phpt b/tests/test_log_callback_crash_doesnt_log.phpt
index 083cede..cab535d 100644
--- a/tests/test_log_callback_crash_doesnt_log.phpt
+++ b/tests/test_log_callback_crash_doesnt_log.phpt
@@ -18,7 +18,7 @@ function test_instrumented() {
     throw new \RuntimeException("log callback crashed");
 });
 
-\Sentry\instrument(null, 'test_instrumented', []);
+\Sentry\instrument('test_instrumented', attributes: []);
 test_instrumented();
 
 ?>
diff --git a/tests/test_log_duplicate_instrument.phpt b/tests/test_log_duplicate_instrument.phpt
index 592d97d..81cb835 100644
--- a/tests/test_log_duplicate_instrument.phpt
+++ b/tests/test_log_duplicate_instrument.phpt
@@ -18,8 +18,8 @@ function test_instrumented() {
     echo $level . ":" . $message . PHP_EOL;
 });
 
-var_dump(\Sentry\instrument(null, 'test_instrumented', []));
-var_dump(\Sentry\instrument(null, 'test_instrumented', []));
+var_dump(\Sentry\instrument('test_instrumented', attributes: []));
+var_dump(\Sentry\instrument('test_instrumented', attributes: []));
 
 ?>
 --EXPECTF--
diff --git a/tests/test_log_end_callback_exception.phpt b/tests/test_log_end_callback_exception.phpt
index 42049f1..f998b68 100644
--- a/tests/test_log_end_callback_exception.phpt
+++ b/tests/test_log_end_callback_exception.phpt
@@ -17,7 +17,7 @@ function test_instrumented() {
     echo $level . ":" . $message . PHP_EOL;
 });
 
-\Sentry\instrument(null, 'test_instrumented', []);
+\Sentry\instrument('test_instrumented', attributes: []);
 test_instrumented();
 
 ?>
diff --git a/tests/test_log_start_callback_exception.phpt b/tests/test_log_start_callback_exception.phpt
index d1c9c43..ae40ece 100644
--- a/tests/test_log_start_callback_exception.phpt
+++ b/tests/test_log_start_callback_exception.phpt
@@ -17,7 +17,7 @@ function test_instrumented() {
     echo $level . ":" . $message . PHP_EOL;
 });
 
-\Sentry\instrument(null, 'test_instrumented', []);
+\Sentry\instrument('test_instrumented', attributes: []);
 test_instrumented();
 
 ?>
diff --git a/tests/test_metadata_key_always_exists.phpt b/tests/test_metadata_key_always_exists.phpt
index 2812077..a5b61fe 100644
--- a/tests/test_metadata_key_always_exists.phpt
+++ b/tests/test_metadata_key_always_exists.phpt
@@ -19,7 +19,7 @@ function test_instrumented() {
     }
 }); 
 
-\Sentry\instrument(null, 'test_instrumented');
+\Sentry\instrument('test_instrumented');
 test_instrumented();
 
 ?>
diff --git a/tests/test_method_metadata.phpt b/tests/test_method_metadata.phpt
index 59ec6ad..9c2571f 100644
--- a/tests/test_method_metadata.phpt
+++ b/tests/test_method_metadata.phpt
@@ -22,7 +22,7 @@ class Foo {
     echo "End metadata: " . ($data['metadata']['sentry.op'] ?? 'invalid') . PHP_EOL;
 }); 
 
-\Sentry\instrument("Foo", 'work', ['sentry.op' => 'test']);
+\Sentry\instrument('work', class: "Foo", attributes: ['sentry.op' => 'test']);
 (new Foo())->work();
 
 ?>
diff --git a/tests/test_nested_exceptions_properly_scoped.phpt b/tests/test_nested_exceptions_properly_scoped.phpt
index 08d6d76..f882181 100644
--- a/tests/test_nested_exceptions_properly_scoped.phpt
+++ b/tests/test_nested_exceptions_properly_scoped.phpt
@@ -27,8 +27,8 @@ function test_rethrow() {
     echo get_class($exception) . PHP_EOL;
 }); 
 
-\Sentry\instrument(null, 'test_throw');
-\Sentry\instrument(null, 'test_rethrow');
+\Sentry\instrument('test_throw');
+\Sentry\instrument('test_rethrow');
 try {
 test_rethrow();
 } catch (Throwable $t) {
diff --git a/tests/test_nested_functions.phpt b/tests/test_nested_functions.phpt
index ab39c2c..67bd838 100644
--- a/tests/test_nested_functions.phpt
+++ b/tests/test_nested_functions.phpt
@@ -25,9 +25,9 @@ function work3() {
     echo "End name: " . $data['name'] . PHP_EOL;
 }); 
 
-\Sentry\instrument(null, 'work1');
-\Sentry\instrument(null, 'work2');
-\Sentry\instrument(null, 'work3');
+\Sentry\instrument('work1');
+\Sentry\instrument('work2');
+\Sentry\instrument('work3');
 
 work1();
 
diff --git a/tests/test_no_callback.phpt b/tests/test_no_callback.phpt
index 4ccf010..a9519bc 100644
--- a/tests/test_no_callback.phpt
+++ b/tests/test_no_callback.phpt
@@ -9,7 +9,7 @@ function work() {
     return 10;
 }
 
-$result = \Sentry\instrument(null, 'work');
+$result = \Sentry\instrument('work');
 work();
 
 ?>
diff --git a/tests/test_non_existent_function.phpt b/tests/test_non_existent_function.phpt
index 85612fc..960b050 100644
--- a/tests/test_non_existent_function.phpt
+++ b/tests/test_non_existent_function.phpt
@@ -14,7 +14,7 @@ function work() {
     echo "Duration: " . $data['duration'] . PHP_EOL;
 }); 
 
-\Sentry\instrument(null, 'working');
+\Sentry\instrument('working');
 work();
 
 ?>
diff --git a/tests/test_non_existent_method.phpt b/tests/test_non_existent_method.phpt
index 0bce3cd..e6bf931 100644
--- a/tests/test_non_existent_method.phpt
+++ b/tests/test_non_existent_method.phpt
@@ -16,7 +16,7 @@ class Foo {
     echo "Duration: " . $data['duration'] . PHP_EOL;
 }); 
 
-\Sentry\instrument(null, 'work');
+\Sentry\instrument('work');
 (new Foo())->work();
 
 ?>
diff --git a/tests/test_postprocessing.phpt b/tests/test_postprocessing.phpt
index 75f4f2f..0769386 100644
--- a/tests/test_postprocessing.phpt
+++ b/tests/test_postprocessing.phpt
@@ -21,7 +21,7 @@ function test_instrumented(string $foo, int $bar) {
     echo "Return: " . $data['metadata']['return'] . PHP_EOL;
 }); 
 
-\Sentry\instrument(null, 'test_instrumented', postprocessing: static function (string $return) {
+\Sentry\instrument('test_instrumented', postprocessing: static function (string $return) {
     return [
         'return' => $return,
     ];
diff --git a/tests/test_postprocessing_crash_in_callback.phpt b/tests/test_postprocessing_crash_in_callback.phpt
index 0d5cb31..b0e14e9 100644
--- a/tests/test_postprocessing_crash_in_callback.phpt
+++ b/tests/test_postprocessing_crash_in_callback.phpt
@@ -17,7 +17,7 @@ function test_instrumented(string $foo, int $bar) {
     }
 }); 
 
-\Sentry\instrument(null, 'test_instrumented', postprocessing: static function (string $return) {
+\Sentry\instrument('test_instrumented', postprocessing: static function (string $return) {
     throw new \RuntimeException("oh no");
 });
 
diff --git a/tests/test_postprocessing_invalid_signature.phpt b/tests/test_postprocessing_invalid_signature.phpt
index 12dd5e1..c3f0e17 100644
--- a/tests/test_postprocessing_invalid_signature.phpt
+++ b/tests/test_postprocessing_invalid_signature.phpt
@@ -17,7 +17,7 @@ function test_instrumented(string $foo, int $bar): string {
     }
 }); 
 
-\Sentry\instrument(null, 'test_instrumented', postprocessing: static function (int $return) {
+\Sentry\instrument('test_instrumented', postprocessing: static function (int $return) {
     return [
         'return' => \gettype($return),
     ];
diff --git a/tests/test_postprocessing_null_return.phpt b/tests/test_postprocessing_null_return.phpt
index 269ac32..678953c 100644
--- a/tests/test_postprocessing_null_return.phpt
+++ b/tests/test_postprocessing_null_return.phpt
@@ -13,7 +13,7 @@ function test_instrumented(string $foo, int $bar): ?string {
     echo "Return: " . $data['metadata']['return'] . PHP_EOL;
 }); 
 
-\Sentry\instrument(null, 'test_instrumented', postprocessing: static function ($return) {
+\Sentry\instrument('test_instrumented', postprocessing: static function ($return) {
     return [
         'return' => \gettype($return),
     ];
diff --git a/tests/test_postprocessing_void_return.phpt b/tests/test_postprocessing_void_return.phpt
index 8fc9136..5086b2e 100644
--- a/tests/test_postprocessing_void_return.phpt
+++ b/tests/test_postprocessing_void_return.phpt
@@ -13,7 +13,7 @@ function test_instrumented(string $foo, int $bar): void {
     echo "Return: " . $data['metadata']['return'] . PHP_EOL;
 }); 
 
-\Sentry\instrument(null, 'test_instrumented', postprocessing: static function ($return) {
+\Sentry\instrument('test_instrumented', postprocessing: static function ($return) {
     return [
         'return' => \gettype($return),
     ];
diff --git a/tests/test_preprocessing.phpt b/tests/test_preprocessing.phpt
index ddad9a4..65d40fd 100644
--- a/tests/test_preprocessing.phpt
+++ b/tests/test_preprocessing.phpt
@@ -19,7 +19,7 @@ function test_instrumented(string $foo, int $bar) {
     echo "Bar: " . $data['metadata']['bar'] . PHP_EOL;
 }); 
 
-\Sentry\instrument(null, 'test_instrumented', preprocessing: static function (string $foo, int $bar) {
+\Sentry\instrument('test_instrumented', preprocessing: static function (string $foo, int $bar) {
     return [
         'foo' => $foo,
         'bar' => $bar
diff --git a/tests/test_preprocessing_crash.phpt b/tests/test_preprocessing_crash.phpt
index 327613b..d4dae54 100644
--- a/tests/test_preprocessing_crash.phpt
+++ b/tests/test_preprocessing_crash.phpt
@@ -17,7 +17,7 @@ function test_instrumented(string $foo, int $bar) {
     }
 }); 
 
-\Sentry\instrument(null, 'test_instrumented', postprocessing: static function () {
+\Sentry\instrument('test_instrumented', postprocessing: static function () {
     return ['return' => 'return'];
 });
 
diff --git a/tests/test_preprocessing_crash_in_callback.phpt b/tests/test_preprocessing_crash_in_callback.phpt
index cfa6b0f..efaf35b 100644
--- a/tests/test_preprocessing_crash_in_callback.phpt
+++ b/tests/test_preprocessing_crash_in_callback.phpt
@@ -17,7 +17,7 @@ function test_instrumented(string $foo, int $bar) {
     echo "end callback" . PHP_EOL;
 }); 
 
-\Sentry\instrument(null, 'test_instrumented', preprocessing: static function (string $foo, int $bar) {
+\Sentry\instrument('test_instrumented', preprocessing: static function (string $foo, int $bar) {
     throw new \RuntimeException("Oh no");
 });
 
diff --git a/tests/test_preprocessing_invalid_signature.phpt b/tests/test_preprocessing_invalid_signature.phpt
index 0228628..0cef313 100644
--- a/tests/test_preprocessing_invalid_signature.phpt
+++ b/tests/test_preprocessing_invalid_signature.phpt
@@ -14,7 +14,7 @@ function test_instrumented(string $foo, int $bar): string {
     echo "Bar: " . ($data['metadata']['bar'] ?? 'No Bar'). PHP_EOL;
 }); 
 
-\Sentry\instrument(null, 'test_instrumented', postprocessing: static function (int $foo, float $bar) {
+\Sentry\instrument('test_instrumented', postprocessing: static function (int $foo, float $bar) {
     return [
         'return' => \gettype($return),
     ];
diff --git a/tests/test_preprocessing_with_objects.phpt b/tests/test_preprocessing_with_objects.phpt
index 4aba410..fb6999c 100644
--- a/tests/test_preprocessing_with_objects.phpt
+++ b/tests/test_preprocessing_with_objects.phpt
@@ -38,7 +38,7 @@ function test_instrumented(A $a) {
     }
 }); 
 
-\Sentry\instrument(null, 'test_instrumented', preprocessing: static function (A $param) {
+\Sentry\instrument('test_instrumented', preprocessing: static function (A $param) {
     return [
         'param' => $param->getX(),
     ];
diff --git a/tests/test_reentry_guard.phpt b/tests/test_reentry_guard.phpt
index d8d280d..5ebaae5 100644
--- a/tests/test_reentry_guard.phpt
+++ b/tests/test_reentry_guard.phpt
@@ -17,7 +17,7 @@ function work() {
     work();
 }); 
 
-\Sentry\instrument(null, 'work', ['sentry.op' => 'test']);
+\Sentry\instrument('work', attributes: ['sentry.op' => 'test']);
 work();
 
 ?>
diff --git a/tests/test_simple_function.phpt b/tests/test_simple_function.phpt
index 03d137d..79c8357 100644
--- a/tests/test_simple_function.phpt
+++ b/tests/test_simple_function.phpt
@@ -19,7 +19,7 @@ function test_instrumented() {
     echo "Duration: " . $data['duration'] . PHP_EOL;
 }); 
 
-\Sentry\instrument(null, 'test_instrumented', []);
+\Sentry\instrument('test_instrumented', attributes: []);
 test_instrumented();
 
 ?>
diff --git a/tests/test_simple_method.phpt b/tests/test_simple_method.phpt
index ad3ada4..e241217 100644
--- a/tests/test_simple_method.phpt
+++ b/tests/test_simple_method.phpt
@@ -16,7 +16,7 @@ class Foo {
     echo "Duration: " . $data['duration'] . PHP_EOL;
 }); 
 
-\Sentry\instrument("Foo", 'work', []);
+\Sentry\instrument('work', class: "Foo", attributes: []);
 (new Foo())->work();
 
 ?>
diff --git a/tests/test_start_callback_can_be_overwritten.phpt b/tests/test_start_callback_can_be_overwritten.phpt
index 3148804..4e71db6 100644
--- a/tests/test_start_callback_can_be_overwritten.phpt
+++ b/tests/test_start_callback_can_be_overwritten.phpt
@@ -18,7 +18,7 @@ class Foo {
     echo "Second callback" . PHP_EOL;
 });
 
-\Sentry\instrument("Foo", 'work', []);
+\Sentry\instrument('work', class: "Foo", attributes: []);
 (new Foo())->work();
 
 ?>
diff --git a/tests/test_static_method.phpt b/tests/test_static_method.phpt
index e5c8185..d26822a 100644
--- a/tests/test_static_method.phpt
+++ b/tests/test_static_method.phpt
@@ -16,7 +16,7 @@ class Foo {
     echo "Duration: " . $data['duration'] . PHP_EOL;
 }); 
 
-\Sentry\instrument("Foo", 'work', []);
+\Sentry\instrument('work', class: "Foo", attributes: []);
 Foo::work();
 
 ?>
diff --git a/tests/test_variadic_metdata_list_ignored.phpt b/tests/test_variadic_metdata_list_ignored.phpt
index 2bbdfc3..868bcd5 100644
--- a/tests/test_variadic_metdata_list_ignored.phpt
+++ b/tests/test_variadic_metdata_list_ignored.phpt
@@ -20,7 +20,7 @@ function test_instrumented() {
     }
 });
 
-\Sentry\instrument(null, "test_instrumented", attributes: ['test', 'example', 'bar']);
+\Sentry\instrument("test_instrumented", attributes: ['test', 'example', 'bar']);
 test_instrumented();
 
 ?>
diff --git a/tests/test_variadic_metdata_numeric_ignored.phpt b/tests/test_variadic_metdata_numeric_ignored.phpt
index cf5b400..57e2c1c 100644
--- a/tests/test_variadic_metdata_numeric_ignored.phpt
+++ b/tests/test_variadic_metdata_numeric_ignored.phpt
@@ -20,7 +20,7 @@ function test_instrumented() {
     }
 });
 
-\Sentry\instrument(null, "test_instrumented", attributes: [0 => 'test', 1 => 'abc', 'test' => 'example']);
+\Sentry\instrument("test_instrumented", attributes: [0 => 'test', 1 => 'abc', 'test' => 'example']);
 test_instrumented();
 
 ?>
diff --git a/tests/test_variadic_metdata_overwrite.phpt b/tests/test_variadic_metdata_overwrite.phpt
index dc4849d..370d5d2 100644
--- a/tests/test_variadic_metdata_overwrite.phpt
+++ b/tests/test_variadic_metdata_overwrite.phpt
@@ -22,7 +22,7 @@ function test_instrumented() {
     echo "Custom: " . $data['metadata']['custom'] . PHP_EOL;
 });
 
-\Sentry\instrument(null, "test_instrumented", op: "foo", description: "bar", custom: "oh no", attributes: ["custom" => "abc", "test" => "example"]);
+\Sentry\instrument("test_instrumented", op: "foo", description: "bar", custom: "oh no", attributes: ["custom" => "abc", "test" => "example"]);
 test_instrumented();
 
 ?>