diff --git a/src/agent/modify.ts b/src/agent/modify.ts
index e89283e..ad47c39 100644
--- a/src/agent/modify.ts
+++ b/src/agent/modify.ts
@@ -64,6 +64,9 @@ function buildModelSettings(
       // client type may lag this field, so set it via a narrow record cast.
       (openaiSettings as Record<string, unknown>).verbosity = verbosity;
     }
+    if (typeof updateArgs?.strict === "boolean") {
+      openaiSettings.strict = updateArgs.strict;
+    }
     settings = openaiSettings;
   } else if (isAnthropic) {
     const anthropicSettings: AnthropicModelSettings = {
@@ -90,6 +93,9 @@ function buildModelSettings(
         }),
       };
     }
+    if (typeof updateArgs?.strict === "boolean") {
+      (anthropicSettings as Record<string, unknown>).strict = updateArgs.strict;
+    }
     settings = anthropicSettings;
   } else if (isZai) {
     // Zai uses the same model_settings structure as other providers.
@@ -162,6 +168,9 @@ function buildModelSettings(
           ? updateArgs.parallel_tool_calls
           : true,
     };
+    if (typeof updateArgs?.strict === "boolean") {
+      (settings as Record<string, unknown>).strict = updateArgs.strict;
+    }
   }
 
   // Apply max_output_tokens only when provider_type is present and the value