diff --git a/src/plugin-handlers/agent-config-handler.ts b/src/plugin-handlers/agent-config-handler.ts
index 33f15f233..36c563bc3 100644
--- a/src/plugin-handlers/agent-config-handler.ts
+++ b/src/plugin-handlers/agent-config-handler.ts
@@ -137,7 +137,7 @@ export async function applyAgentConfig(params: {
 
   const isSisyphusEnabled = params.pluginConfig.sisyphus_agent?.disabled !== true;
   const builderEnabled =
-    params.pluginConfig.sisyphus_agent?.default_builder_enabled ?? false;
+    params.pluginConfig.sisyphus_agent?.default_builder_enabled ?? true;
   const plannerEnabled = params.pluginConfig.sisyphus_agent?.planner_enabled ?? true;
   const replacePlan = params.pluginConfig.sisyphus_agent?.replace_plan ?? true;
   const shouldDemotePlan = plannerEnabled && replacePlan;