diff --git a/property_tests/arbitraries/candid/constructed/blob_arb.ts b/property_tests/arbitraries/candid/constructed/blob_arb.ts
index 6090071e99..bee4bcd2d8 100644
--- a/property_tests/arbitraries/candid/constructed/blob_arb.ts
+++ b/property_tests/arbitraries/candid/constructed/blob_arb.ts
@@ -1,5 +1,5 @@
 import fc from 'fast-check';
-import { CandidMetaArb } from '../candid_arb';
+import { CandidMeta, CandidMetaArb } from '../candid_arb';
 import { blobToSrcLiteral } from '../to_src_literal/blob';
 
 export const BlobArb = fc
@@ -7,7 +7,9 @@ export const BlobArb = fc
         CandidMetaArb(fc.uint8Array(), 'Vec(nat8)', blobToSrcLiteral),
         CandidMetaArb(fc.uint8Array(), 'blob', blobToSrcLiteral)
     )
-    .map((sample) => ({
-        ...sample,
-        src: { ...sample.src, imports: new Set(['blob', 'nat8', 'Vec']) }
-    }));
+    .map(
+        (sample): CandidMeta<Uint8Array> => ({
+            ...sample,
+            src: { ...sample.src, imports: new Set(['blob', 'nat8', 'Vec']) }
+        })
+    );
diff --git a/property_tests/arbitraries/candid/constructed/tuple_arb/base.ts b/property_tests/arbitraries/candid/constructed/tuple_arb/base.ts
index a1af33377c..504da6b963 100644
--- a/property_tests/arbitraries/candid/constructed/tuple_arb/base.ts
+++ b/property_tests/arbitraries/candid/constructed/tuple_arb/base.ts
@@ -33,7 +33,7 @@ export function TupleArb(candidTypeArb: fc.Arbitrary<CandidMeta<CandidType>>) {
 
                 const agentArgumentValue = generateVale(fields);
 
-                const agentResponseValue = generateExpectedVale(fields);
+                const agentResponseValue = generateExpectedValue(fields);
 
                 return {
                     src: {
@@ -53,7 +53,7 @@ function generateVale(fields: CandidMeta<CandidType>[]) {
     return fields.map((field) => field.agentArgumentValue);
 }
 
-function generateExpectedVale(fields: CandidMeta<CandidType>[]): Tuple | {} {
+function generateExpectedValue(fields: CandidMeta<CandidType>[]): ReturnTuple {
     if (fields.length === 0) {
         return {};
     }
diff --git a/property_tests/arbitraries/query_method_arb.ts b/property_tests/arbitraries/query_method_arb.ts
index c95c52f548..9ee7931733 100644
--- a/property_tests/arbitraries/query_method_arb.ts
+++ b/property_tests/arbitraries/query_method_arb.ts
@@ -18,30 +18,46 @@ export type QueryMethod = {
 
 export type BodyGenerator<
     ParamType extends CandidType,
-    ReturnType extends CandidType
+    ParamAgentType,
+    ReturnType extends CandidType,
+    ReturnAgentType
 > = (
-    namedParams: Named<CandidMeta<ParamType>>[],
-    returnType: CandidMeta<ReturnType>
+    namedParams: Named<CandidMeta<ParamType, ParamAgentType>>[],
+    returnType: CandidMeta<ReturnType, ReturnAgentType>
 ) => string;
 
 export type TestsGenerator<
     ParamType extends CandidType,
-    ReturnType extends CandidType
+    ParamAgentType,
+    ReturnType extends CandidType,
+    ReturnAgentType
 > = (
     methodName: string,
-    namedParams: Named<CandidMeta<ParamType>>[],
-    returnType: CandidMeta<ReturnType>
+    namedParams: Named<CandidMeta<ParamType, ParamAgentType>>[],
+    returnType: CandidMeta<ReturnType, ReturnAgentType>
 ) => Test[];
 
 export function QueryMethodArb<
     ParamType extends CandidType,
-    ReturnType extends CandidType
+    ParamAgentType,
+    ReturnType extends CandidType,
+    ReturnAgentType
 >(
-    paramTypeArrayArb: fc.Arbitrary<CandidMeta<ParamType>[]>,
-    returnTypeArb: fc.Arbitrary<CandidMeta<ReturnType>>,
+    paramTypeArrayArb: fc.Arbitrary<CandidMeta<ParamType, ParamAgentType>[]>,
+    returnTypeArb: fc.Arbitrary<CandidMeta<ReturnType, ReturnAgentType>>,
     constraints: {
-        generateBody: BodyGenerator<ParamType, ReturnType>;
-        generateTests: TestsGenerator<ParamType, ReturnType>;
+        generateBody: BodyGenerator<
+            ParamType,
+            ParamAgentType,
+            ReturnType,
+            ReturnAgentType
+        >;
+        generateTests: TestsGenerator<
+            ParamType,
+            ParamAgentType,
+            ReturnType,
+            ReturnAgentType
+        >;
         // TODO: Consider adding a callback to determine the returnType
         // i.e. instead of using the first one if the params array isn't empty.
     }