diff --git a/src/config/env/joinir_dev.rs b/src/config/env/joinir_dev.rs
index 6211ba29..f6560313 100644
--- a/src/config/env/joinir_dev.rs
+++ b/src/config/env/joinir_dev.rs
@@ -47,9 +47,11 @@ pub fn vm_bridge_enabled() -> bool {
     env_bool("NYASH_JOINIR_VM_BRIDGE")
 }
 
-/// NYASH_JOINIR_STRICT=1 - Strict validation mode
+/// HAKO_JOINIR_STRICT=1 or NYASH_JOINIR_STRICT=1 - Strict validation mode
+///
+/// Phase 138-P2-A: Supports both HAKO_ and NYASH_ prefixes for compatibility
 pub fn strict_enabled() -> bool {
-    env_bool("NYASH_JOINIR_STRICT")
+    env_bool("HAKO_JOINIR_STRICT") || env_bool("NYASH_JOINIR_STRICT")
 }
 
 /// NYASH_JOINIR_SNAPSHOT_GENERATE=1 - Generate snapshot for testing