diff --git a/packages/cli/api-importers/openapi/openapi-ir-to-fern/src/buildQueryParameter.ts b/packages/cli/api-importers/openapi/openapi-ir-to-fern/src/buildQueryParameter.ts
index 1d320b9d791..452108871bf 100644
--- a/packages/cli/api-importers/openapi/openapi-ir-to-fern/src/buildQueryParameter.ts
+++ b/packages/cli/api-importers/openapi/openapi-ir-to-fern/src/buildQueryParameter.ts
@@ -67,10 +67,9 @@ export function buildQueryParameter({
         queryParameterSchema.availability = convertAvailability(queryParameter.availability);
     }
 
-    if (typeof typeReference.value === "object" && "type" in typeReference.value) {
-        const detailedSchema = typeReference.value as RawSchemas.TypeReferenceDetailedSchema;
-        if (detailedSchema.validation !== undefined) {
-            queryParameterSchema.validation = detailedSchema.validation;
+    if (isRawTypeReferenceDetailedSchema(typeReference.value)) {
+        if (typeReference.value.validation !== undefined) {
+            queryParameterSchema.validation = typeReference.value.validation;
         }
     }
 
@@ -432,3 +431,9 @@ function hasSamePrimitiveValueType({ array, primitive }: { array: Schema; primit
         array.value.schema.type === primitive.schema.type
     );
 }
+
+function isRawTypeReferenceDetailedSchema(
+    rawTypeReference: RawSchemas.TypeReferenceSchema
+): rawTypeReference is RawSchemas.TypeReferenceDetailedSchema {
+    return (rawTypeReference as RawSchemas.TypeReferenceDetailedSchema).type != null;
+}
diff --git a/packages/cli/ete-tests/src/tests/help/__snapshots__/help.test.ts.snap b/packages/cli/ete-tests/src/tests/help/__snapshots__/help.test.ts.snap
index ad693732aeb..a8909f0f8f9 100644
--- a/packages/cli/ete-tests/src/tests/help/__snapshots__/help.test.ts.snap
+++ b/packages/cli/ete-tests/src/tests/help/__snapshots__/help.test.ts.snap
@@ -1,7 +1,9 @@
 // Vitest Snapshot v1, https://vitest.dev/guide/snapshot.html
 
 exports[`help > no arguments 1`] = `
-"fern-dev
+"(node:21283) [DEP0040] DeprecationWarning: The \`punycode\` module is deprecated. Please use a userland alternative instead.
+(Use \`node --trace-deprecation ...\` to show where the warning was created)
+fern-dev
 
 Commands:
   fern-dev init                         Initialize a Fern API
diff --git a/packages/cli/ete-tests/src/tests/write-definition/__snapshots__/writeDefinition.test.ts.snap b/packages/cli/ete-tests/src/tests/write-definition/__snapshots__/writeDefinition.test.ts.snap
index 591c256bf04..f8917944b6f 100644
--- a/packages/cli/ete-tests/src/tests/write-definition/__snapshots__/writeDefinition.test.ts.snap
+++ b/packages/cli/ete-tests/src/tests/write-definition/__snapshots__/writeDefinition.test.ts.snap
@@ -67,6 +67,8 @@ service:
           limit:
             docs: How many items to return at one time (max 100)
             type: optional<integer>
+            validation:
+              max: 100
       response:
         docs: A paged array of pets
         type: root.Pets
@@ -172,6 +174,8 @@ service:
           limit:
             docs: How many items to return at one time (max 100)
             type: optional<integer>
+            validation:
+              max: 100
       response:
         docs: A paged array of pets
         type: root.Pets
@@ -308,6 +312,8 @@ service:
           limit:
             docs: How many items to return at one time (max 100)
             type: optional<integer>
+            validation:
+              max: 100
       response:
         docs: A paged array of pets
         type: neopetsRoot.Pets
@@ -1462,12 +1468,16 @@ service:
           destination:
             docs: The ID of the destination station
             type: string
+            validation:
+              format: uuid
           dogs:
             docs: Only return trips where dogs are known to be allowed
             type: optional<boolean>
           origin:
             docs: The ID of the origin station
             type: string
+            validation:
+              format: uuid
       response:
         docs: A list of available train trips
         type: GetTripsResponse
diff --git a/packages/cli/ete-tests/src/tests/write-definition/fixtures/header-overrides/fern/.definition/pets.yml b/packages/cli/ete-tests/src/tests/write-definition/fixtures/header-overrides/fern/.definition/pets.yml
index f25130e86d3..5560f3dd1cf 100644
--- a/packages/cli/ete-tests/src/tests/write-definition/fixtures/header-overrides/fern/.definition/pets.yml
+++ b/packages/cli/ete-tests/src/tests/write-definition/fixtures/header-overrides/fern/.definition/pets.yml
@@ -30,6 +30,8 @@ service:
           limit:
             docs: How many items to return at one time (max 100)
             type: optional<integer>
+            validation:
+              max: 100
       response:
         docs: A paged array of pets
         type: root.Pets
diff --git a/packages/cli/ete-tests/src/tests/write-definition/fixtures/namespaced/fern/.definition/neopets/pets.yml b/packages/cli/ete-tests/src/tests/write-definition/fixtures/namespaced/fern/.definition/neopets/pets.yml
index e388ff71933..a4a02c84255 100644
--- a/packages/cli/ete-tests/src/tests/write-definition/fixtures/namespaced/fern/.definition/neopets/pets.yml
+++ b/packages/cli/ete-tests/src/tests/write-definition/fixtures/namespaced/fern/.definition/neopets/pets.yml
@@ -32,6 +32,8 @@ service:
           limit:
             docs: How many items to return at one time (max 100)
             type: optional<integer>
+            validation:
+              max: 100
       response:
         docs: A paged array of pets
         type: neopetsRoot.Pets
diff --git a/packages/cli/ete-tests/src/tests/write-definition/fixtures/namespaced/fern/.definition/trains/trips.yml b/packages/cli/ete-tests/src/tests/write-definition/fixtures/namespaced/fern/.definition/trains/trips.yml
index d6acafb693d..8fa053dea56 100644
--- a/packages/cli/ete-tests/src/tests/write-definition/fixtures/namespaced/fern/.definition/trains/trips.yml
+++ b/packages/cli/ete-tests/src/tests/write-definition/fixtures/namespaced/fern/.definition/trains/trips.yml
@@ -83,12 +83,16 @@ service:
           destination:
             docs: The ID of the destination station
             type: string
+            validation:
+              format: uuid
           dogs:
             docs: Only return trips where dogs are known to be allowed
             type: optional<boolean>
           origin:
             docs: The ID of the origin station
             type: string
+            validation:
+              format: uuid
       response:
         docs: A list of available train trips
         type: GetTripsResponse
diff --git a/packages/cli/ete-tests/src/tests/write-definition/fixtures/petstore/fern/.definition/pets.yml b/packages/cli/ete-tests/src/tests/write-definition/fixtures/petstore/fern/.definition/pets.yml
index f25130e86d3..5560f3dd1cf 100644
--- a/packages/cli/ete-tests/src/tests/write-definition/fixtures/petstore/fern/.definition/pets.yml
+++ b/packages/cli/ete-tests/src/tests/write-definition/fixtures/petstore/fern/.definition/pets.yml
@@ -30,6 +30,8 @@ service:
           limit:
             docs: How many items to return at one time (max 100)
             type: optional<integer>
+            validation:
+              max: 100
       response:
         docs: A paged array of pets
         type: root.Pets