diff --git a/src/test_suite/fuzz_context.py b/src/test_suite/fuzz_context.py
index 74168b5..aaa2e5b 100644
--- a/src/test_suite/fuzz_context.py
+++ b/src/test_suite/fuzz_context.py
@@ -34,6 +34,12 @@
     effects_human_encode_fn=syscall_codec.encode_output,
 )
 
+CPIHarness = HarnessCtx(
+    fuzz_fn_name="sol_compat_vm_cpi_syscall_v1",
+    fixture_desc=vm_pb.SyscallFixture.DESCRIPTOR,
+    effects_human_encode_fn=syscall_codec.encode_output,
+)
+
 ValidateVM = HarnessCtx(
     fuzz_fn_name="sol_compat_vm_validate_v1",
     fixture_desc=vm_pb.ValidateVmFixture.DESCRIPTOR,
diff --git a/src/test_suite/vm_pb2.py b/src/test_suite/vm_pb2.py
index 5e6d62b..dea4b86 100644
--- a/src/test_suite/vm_pb2.py
+++ b/src/test_suite/vm_pb2.py
@@ -16,7 +16,7 @@
     package="org.solana.sealevel.v1",
     syntax="proto3",
     serialized_pb=_b(
-        '\n\x08vm.proto\x12\x16org.solana.sealevel.v1\x1a\x0cinvoke.proto\x1a\rcontext.proto"G\n\x0fInputDataRegion\x12\x0e\n\x06offset\x18\x01 \x01(\x04\x12\x0f\n\x07content\x18\x02 \x01(\x0c\x12\x13\n\x0bis_writable\x18\x03 \x01(\x08"¸\x03\n\tVmContext\x12\x10\n\x08heap_max\x18\x01 \x01(\x04\x12\x0e\n\x06rodata\x18\x02 \x01(\x0c\x12"\n\x1arodata_text_section_offset\x18\x03 \x01(\x04\x12"\n\x1arodata_text_section_length\x18\x04 \x01(\x04\x12C\n\x12input_data_regions\x18\x05 \x03(\x0b2\'.org.solana.sealevel.v1.InputDataRegion\x12\n\n\x02r0\x18\x06 \x01(\x04\x12\n\n\x02r1\x18\x07 \x01(\x04\x12\n\n\x02r2\x18\x08 \x01(\x04\x12\n\n\x02r3\x18\t \x01(\x04\x12\n\n\x02r4\x18\n \x01(\x04\x12\n\n\x02r5\x18\x0b \x01(\x04\x12\n\n\x02r6\x18\x0c \x01(\x04\x12\n\n\x02r7\x18\r \x01(\x04\x12\n\n\x02r8\x18\x0e \x01(\x04\x12\n\n\x02r9\x18\x0f \x01(\x04\x12\x0b\n\x03r10\x18\x10 \x01(\x04\x12\x0b\n\x03r11\x18\x11 \x01(\x04\x12\x13\n\x0bcheck_align\x18\x12 \x01(\x08\x12\x12\n\ncheck_size\x18\x13 \x01(\x08\x12\x10\n\x08entry_pc\x18\x14 \x01(\x04\x12\x16\n\x0ecall_whitelist\x18\x15 \x01(\x0c\x12\x17\n\x0ftracing_enabled\x18\x16 \x01(\x08"U\n\x11SyscallInvocation\x12\x15\n\rfunction_name\x18\x01 \x01(\x0c\x12\x13\n\x0bheap_prefix\x18\x02 \x01(\x0c\x12\x14\n\x0cstack_prefix\x18\x03 \x01(\x0c"Ã\x01\n\x0eSyscallContext\x121\n\x06vm_ctx\x18\x01 \x01(\x0b2!.org.solana.sealevel.v1.VmContext\x127\n\tinstr_ctx\x18\x02 \x01(\x0b2$.org.solana.sealevel.v1.InstrContext\x12E\n\x12syscall_invocation\x18\x03 \x01(\x0b2).org.solana.sealevel.v1.SyscallInvocation"ð\x01\n\x0eSyscallEffects\x12\r\n\x05error\x18\x01 \x01(\x03\x12\n\n\x02r0\x18\x02 \x01(\x04\x12\x10\n\x08cu_avail\x18\x03 \x01(\x04\x12\x0c\n\x04heap\x18\x04 \x01(\x0c\x12\r\n\x05stack\x18\x05 \x01(\x0c\x12\x11\n\tinputdata\x18\x06 \x01(\x0c\x12C\n\x12input_data_regions\x18\x0b \x03(\x0b2\'.org.solana.sealevel.v1.InputDataRegion\x12\x13\n\x0bframe_count\x18\x07 \x01(\x04\x12\x0b\n\x03log\x18\x08 \x01(\x0c\x12\x0e\n\x06rodata\x18\t \x01(\x0c\x12\n\n\x02pc\x18\n \x01(\x04"\x7f\n\x0eSyscallFixture\x125\n\x05input\x18\x01 \x01(\x0b2&.org.solana.sealevel.v1.SyscallContext\x126\n\x06output\x18\x02 \x01(\x0b2&.org.solana.sealevel.v1.SyscallEffects"x\n\rFullVmContext\x121\n\x06vm_ctx\x18\x01 \x01(\x0b2!.org.solana.sealevel.v1.VmContext\x124\n\x08features\x18\x03 \x01(\x0b2".org.solana.sealevel.v1.FeatureSet"4\n\x11ValidateVmEffects\x12\x0e\n\x06result\x18\x01 \x01(\x05\x12\x0f\n\x07success\x18\x02 \x01(\x08"\x84\x01\n\x11ValidateVmFixture\x124\n\x05input\x18\x01 \x01(\x0b2%.org.solana.sealevel.v1.FullVmContext\x129\n\x06output\x18\x02 \x01(\x0b2).org.solana.sealevel.v1.ValidateVmEffectsb\x06proto3'
+        '\n\x08vm.proto\x12\x16org.solana.sealevel.v1\x1a\x0cinvoke.proto\x1a\rcontext.proto"G\n\x0fInputDataRegion\x12\x0e\n\x06offset\x18\x01 \x01(\x04\x12\x0f\n\x07content\x18\x02 \x01(\x0c\x12\x13\n\x0bis_writable\x18\x03 \x01(\x08"¸\x03\n\tVmContext\x12\x10\n\x08heap_max\x18\x01 \x01(\x04\x12\x0e\n\x06rodata\x18\x02 \x01(\x0c\x12"\n\x1arodata_text_section_offset\x18\x03 \x01(\x04\x12"\n\x1arodata_text_section_length\x18\x04 \x01(\x04\x12C\n\x12input_data_regions\x18\x05 \x03(\x0b2\'.org.solana.sealevel.v1.InputDataRegion\x12\n\n\x02r0\x18\x06 \x01(\x04\x12\n\n\x02r1\x18\x07 \x01(\x04\x12\n\n\x02r2\x18\x08 \x01(\x04\x12\n\n\x02r3\x18\t \x01(\x04\x12\n\n\x02r4\x18\n \x01(\x04\x12\n\n\x02r5\x18\x0b \x01(\x04\x12\n\n\x02r6\x18\x0c \x01(\x04\x12\n\n\x02r7\x18\r \x01(\x04\x12\n\n\x02r8\x18\x0e \x01(\x04\x12\n\n\x02r9\x18\x0f \x01(\x04\x12\x0b\n\x03r10\x18\x10 \x01(\x04\x12\x0b\n\x03r11\x18\x11 \x01(\x04\x12\x13\n\x0bcheck_align\x18\x12 \x01(\x08\x12\x12\n\ncheck_size\x18\x13 \x01(\x08\x12\x10\n\x08entry_pc\x18\x14 \x01(\x04\x12\x16\n\x0ecall_whitelist\x18\x15 \x01(\x0c\x12\x17\n\x0ftracing_enabled\x18\x16 \x01(\x08"U\n\x11SyscallInvocation\x12\x15\n\rfunction_name\x18\x01 \x01(\x0c\x12\x13\n\x0bheap_prefix\x18\x02 \x01(\x0c\x12\x14\n\x0cstack_prefix\x18\x03 \x01(\x0c"ÿ\x01\n\x0eSyscallContext\x121\n\x06vm_ctx\x18\x01 \x01(\x0b2!.org.solana.sealevel.v1.VmContext\x127\n\tinstr_ctx\x18\x02 \x01(\x0b2$.org.solana.sealevel.v1.InstrContext\x12E\n\x12syscall_invocation\x18\x03 \x01(\x0b2).org.solana.sealevel.v1.SyscallInvocation\x12:\n\x0cexec_effects\x18\x04 \x01(\x0b2$.org.solana.sealevel.v1.InstrEffects"ð\x01\n\x0eSyscallEffects\x12\r\n\x05error\x18\x01 \x01(\x03\x12\n\n\x02r0\x18\x02 \x01(\x04\x12\x10\n\x08cu_avail\x18\x03 \x01(\x04\x12\x0c\n\x04heap\x18\x04 \x01(\x0c\x12\r\n\x05stack\x18\x05 \x01(\x0c\x12\x11\n\tinputdata\x18\x06 \x01(\x0c\x12C\n\x12input_data_regions\x18\x0b \x03(\x0b2\'.org.solana.sealevel.v1.InputDataRegion\x12\x13\n\x0bframe_count\x18\x07 \x01(\x04\x12\x0b\n\x03log\x18\x08 \x01(\x0c\x12\x0e\n\x06rodata\x18\t \x01(\x0c\x12\n\n\x02pc\x18\n \x01(\x04"\x7f\n\x0eSyscallFixture\x125\n\x05input\x18\x01 \x01(\x0b2&.org.solana.sealevel.v1.SyscallContext\x126\n\x06output\x18\x02 \x01(\x0b2&.org.solana.sealevel.v1.SyscallEffects"x\n\rFullVmContext\x121\n\x06vm_ctx\x18\x01 \x01(\x0b2!.org.solana.sealevel.v1.VmContext\x124\n\x08features\x18\x03 \x01(\x0b2".org.solana.sealevel.v1.FeatureSet"4\n\x11ValidateVmEffects\x12\x0e\n\x06result\x18\x01 \x01(\x05\x12\x0f\n\x07success\x18\x02 \x01(\x08"\x84\x01\n\x11ValidateVmFixture\x124\n\x05input\x18\x01 \x01(\x0b2%.org.solana.sealevel.v1.FullVmContext\x129\n\x06output\x18\x02 \x01(\x0b2).org.solana.sealevel.v1.ValidateVmEffectsb\x06proto3'
     ),
     dependencies=[invoke__pb2.DESCRIPTOR, context__pb2.DESCRIPTOR],
 )
@@ -642,6 +642,24 @@
             options=None,
             file=DESCRIPTOR,
         ),
+        _descriptor.FieldDescriptor(
+            name="exec_effects",
+            full_name="org.solana.sealevel.v1.SyscallContext.exec_effects",
+            index=3,
+            number=4,
+            type=11,
+            cpp_type=10,
+            label=1,
+            has_default_value=False,
+            default_value=None,
+            message_type=None,
+            enum_type=None,
+            containing_type=None,
+            is_extension=False,
+            extension_scope=None,
+            options=None,
+            file=DESCRIPTOR,
+        ),
     ],
     extensions=[],
     nested_types=[],
@@ -652,7 +670,7 @@
     extension_ranges=[],
     oneofs=[],
     serialized_start=669,
-    serialized_end=864,
+    serialized_end=924,
 )
 _SYSCALLEFFECTS = _descriptor.Descriptor(
     name="SyscallEffects",
@@ -868,8 +886,8 @@
     syntax="proto3",
     extension_ranges=[],
     oneofs=[],
-    serialized_start=867,
-    serialized_end=1107,
+    serialized_start=927,
+    serialized_end=1167,
 )
 _SYSCALLFIXTURE = _descriptor.Descriptor(
     name="SyscallFixture",
@@ -923,8 +941,8 @@
     syntax="proto3",
     extension_ranges=[],
     oneofs=[],
-    serialized_start=1109,
-    serialized_end=1236,
+    serialized_start=1169,
+    serialized_end=1296,
 )
 _FULLVMCONTEXT = _descriptor.Descriptor(
     name="FullVmContext",
@@ -978,8 +996,8 @@
     syntax="proto3",
     extension_ranges=[],
     oneofs=[],
-    serialized_start=1238,
-    serialized_end=1358,
+    serialized_start=1298,
+    serialized_end=1418,
 )
 _VALIDATEVMEFFECTS = _descriptor.Descriptor(
     name="ValidateVmEffects",
@@ -1033,8 +1051,8 @@
     syntax="proto3",
     extension_ranges=[],
     oneofs=[],
-    serialized_start=1360,
-    serialized_end=1412,
+    serialized_start=1420,
+    serialized_end=1472,
 )
 _VALIDATEVMFIXTURE = _descriptor.Descriptor(
     name="ValidateVmFixture",
@@ -1088,13 +1106,14 @@
     syntax="proto3",
     extension_ranges=[],
     oneofs=[],
-    serialized_start=1415,
-    serialized_end=1547,
+    serialized_start=1475,
+    serialized_end=1607,
 )
 _VMCONTEXT.fields_by_name["input_data_regions"].message_type = _INPUTDATAREGION
 _SYSCALLCONTEXT.fields_by_name["vm_ctx"].message_type = _VMCONTEXT
 _SYSCALLCONTEXT.fields_by_name["instr_ctx"].message_type = invoke__pb2._INSTRCONTEXT
 _SYSCALLCONTEXT.fields_by_name["syscall_invocation"].message_type = _SYSCALLINVOCATION
+_SYSCALLCONTEXT.fields_by_name["exec_effects"].message_type = invoke__pb2._INSTREFFECTS
 _SYSCALLEFFECTS.fields_by_name["input_data_regions"].message_type = _INPUTDATAREGION
 _SYSCALLFIXTURE.fields_by_name["input"].message_type = _SYSCALLCONTEXT
 _SYSCALLFIXTURE.fields_by_name["output"].message_type = _SYSCALLEFFECTS