diff --git a/baml_language/crates/bex_engine/tests/host_value_callable.rs b/baml_language/crates/bex_engine/tests/host_value_callable.rs
index a21929d48a..29ad929c1c 100644
--- a/baml_language/crates/bex_engine/tests/host_value_callable.rs
+++ b/baml_language/crates/bex_engine/tests/host_value_callable.rs
@@ -290,12 +290,12 @@ fn complete_with_test_error(call_id: u32, class_name: &str, message: &str) {
     );
     fields.insert("traceback".to_string(), BexExternalValue::Null);
     // The class's `_handle $rust_type` slot is required by the engine's
-    // structural check. Use a synthetic `HostValue(kind=Error)` handle
+    // structural check. Use a synthetic `HostValue(kind=Opaque)` handle
     // so the BAML→host decoder has *something* to round-trip — the
     // test doesn't rehydrate, so the key value is arbitrary.
     fields.insert(
         "_handle".to_string(),
-        BexExternalValue::HostValue(HostValueArc::new(next_host_key(), HostValueKind::Error)),
+        BexExternalValue::HostValue(HostValueArc::new(next_host_key(), HostValueKind::Opaque)),
     );
     sys_native::host_dispatch::complete_with_throw(
         call_id,
diff --git a/baml_language/crates/bex_resource_types/src/host_value.rs b/baml_language/crates/bex_resource_types/src/host_value.rs
index b8fe1c5941..2c0e472f8c 100644
--- a/baml_language/crates/bex_resource_types/src/host_value.rs
+++ b/baml_language/crates/bex_resource_types/src/host_value.rs
@@ -22,11 +22,12 @@ use once_cell::sync::Lazy;
 pub enum HostValueKind {
     /// A host-language callable (function/closure/method).
     Callable,
-    /// An opaque host-language error value (a native exception that has no
-    /// BAML representation). Holds a reference back to the host error object
-    /// so the originating host can recover the exact native exception on
-    /// round-trip. Surfaced in BAML as `baml.errors.HostCallable`.
-    Error,
+    /// An arbitrary host-language value with no BAML representation, referenced
+    /// by key and round-tripped by identity. Surfaces in BAML as an opaque
+    /// `$rust_type` value (`Ty::RustType`). A native host exception is one
+    /// consumer: the bridge registers it as an opaque value and wraps the
+    /// handle in `baml.errors.HostCallable`.
+    Opaque,
 }
 
 /// Drop-on-last-clone notification fired to the host language.
@@ -562,18 +563,19 @@ mod tests {
         );
     }
 
-    /// `HostValueKind::Error` (added for opaque host-callable error round-trip)
-    /// must follow the same intern/refcount/release contract as `Callable`.
+    /// `HostValueKind::Opaque` (used for opaque host-value round-trip, e.g. the
+    /// host-callable error wrapper) must follow the same intern/refcount/release
+    /// contract as `Callable`.
     #[test]
-    fn error_kind_release_fires_on_last_drop() {
+    fn opaque_kind_release_fires_on_last_drop() {
         let _guard = lock_and_reset();
         let key = 200;
-        let arc = HostValueArc::new(key, HostValueKind::Error);
+        let arc = HostValueArc::new(key, HostValueKind::Opaque);
         drop(arc);
         assert_eq!(
             FIRED.lock().unwrap().as_slice(),
             &[key],
-            "Error-kind release must fire just like Callable"
+            "Opaque-kind release must fire just like Callable"
         );
     }
 
@@ -584,11 +586,11 @@ mod tests {
     /// the assert to a runtime check) is an intentional change.
     #[cfg(not(debug_assertions))]
     #[test]
-    fn intern_collision_callable_vs_error_release_build_keeps_existing() {
+    fn intern_collision_callable_vs_opaque_release_build_keeps_existing() {
         let _guard = lock_and_reset();
         let key = 201;
         let callable = HostValueArc::intern(key, HostValueKind::Callable);
-        let coerced = HostValueArc::intern(key, HostValueKind::Error);
+        let coerced = HostValueArc::intern(key, HostValueKind::Opaque);
         assert!(
             Arc::ptr_eq(&callable, &coerced),
             "release-build intern collision must alias to the existing Arc"
diff --git a/baml_language/crates/bridge_ctypes/src/value_decode.rs b/baml_language/crates/bridge_ctypes/src/value_decode.rs
index 3d706fa528..82f397dae5 100644
--- a/baml_language/crates/bridge_ctypes/src/value_decode.rs
+++ b/baml_language/crates/bridge_ctypes/src/value_decode.rs
@@ -61,8 +61,8 @@ pub fn inbound_to_external(
                 let host_value_kind =
                     if handle.handle_type == BamlHandleType::HostValueCallable as i32 {
                         Some(bex_project::HostValueKind::Callable)
-                    } else if handle.handle_type == BamlHandleType::HostValueError as i32 {
-                        Some(bex_project::HostValueKind::Error)
+                    } else if handle.handle_type == BamlHandleType::HostValueOpaque as i32 {
+                        Some(bex_project::HostValueKind::Opaque)
                     } else {
                         None
                     };
@@ -226,11 +226,11 @@ mod tests {
     }
 
     #[test]
-    fn decode_inbound_host_value_error() {
+    fn decode_inbound_host_value_opaque() {
         let table = CffiHandleTable::new();
         let handle = BamlHandle {
             key: 777,
-            handle_type: BamlHandleType::HostValueError as i32,
+            handle_type: BamlHandleType::HostValueOpaque as i32,
         };
         let inbound = InboundValue {
             value: Some(InboundValueVariant::Handle(handle)),
@@ -239,14 +239,14 @@ mod tests {
         match result {
             BexExternalValue::HostValue(arc) => {
                 assert_eq!(arc.key, 777);
-                assert_eq!(arc.kind, bex_project::HostValueKind::Error);
+                assert_eq!(arc.kind, bex_project::HostValueKind::Opaque);
             }
             other => panic!("unexpected variant: {other:?}"),
         }
-        // Like callables, opaque error handles bypass the HANDLE_TABLE.
+        // Like callables, opaque handles bypass the HANDLE_TABLE.
         assert!(
             table.resolve(777).is_none(),
-            "HOST_VALUE_ERROR must not touch HANDLE_TABLE"
+            "HOST_VALUE_OPAQUE must not touch HANDLE_TABLE"
         );
     }
 
diff --git a/baml_language/crates/bridge_ctypes/src/value_encode.rs b/baml_language/crates/bridge_ctypes/src/value_encode.rs
index d49399f2e0..ee72798d76 100644
--- a/baml_language/crates/bridge_ctypes/src/value_encode.rs
+++ b/baml_language/crates/bridge_ctypes/src/value_encode.rs
@@ -146,7 +146,7 @@ pub fn external_to_outbound(
             use crate::baml_core::cffi::BamlHandleType;
             let ht = match arc.kind {
                 bex_project::HostValueKind::Callable => BamlHandleType::HostValueCallable as i32,
-                bex_project::HostValueKind::Error => BamlHandleType::HostValueError as i32,
+                bex_project::HostValueKind::Opaque => BamlHandleType::HostValueOpaque as i32,
             };
             Some(BamlValueVariant::HandleValue(BamlOutboundHandle {
                 key: arc.key,
@@ -499,8 +499,8 @@ mod tests {
     }
 
     #[test]
-    fn encode_outbound_host_value_error() {
-        let arc = HostValueArc::new(42, HostValueKind::Error);
+    fn encode_outbound_host_value_opaque() {
+        let arc = HostValueArc::new(42, HostValueKind::Opaque);
         let value = BexExternalValue::HostValue(arc);
         let options = CffiHandleTableOptions::for_in_process();
         let encoded = external_to_outbound(&value, &options).expect("encode succeeds");
@@ -509,11 +509,11 @@ mod tests {
             other => panic!("unexpected: {other:?}"),
         };
         assert_eq!(handle.key, 42);
-        assert_eq!(handle.handle_type, BamlHandleType::HostValueError as i32);
-        // Like callables, opaque error handles bypass the HANDLE_TABLE.
+        assert_eq!(handle.handle_type, BamlHandleType::HostValueOpaque as i32);
+        // Like callables, opaque handles bypass the HANDLE_TABLE.
         assert!(
             options.table.resolve(42).is_none(),
-            "HOST_VALUE_ERROR must not be inserted into HANDLE_TABLE"
+            "HOST_VALUE_OPAQUE must not be inserted into HANDLE_TABLE"
         );
     }
 }
diff --git a/baml_language/crates/bridge_ctypes/types/baml_core/cffi/v1/baml_inbound.proto b/baml_language/crates/bridge_ctypes/types/baml_core/cffi/v1/baml_inbound.proto
index e56d2194a9..2e763a5b72 100644
--- a/baml_language/crates/bridge_ctypes/types/baml_core/cffi/v1/baml_inbound.proto
+++ b/baml_language/crates/bridge_ctypes/types/baml_core/cffi/v1/baml_inbound.proto
@@ -47,11 +47,14 @@ enum BamlHandleType {
   // Lifetime: Rust drop notifies host via HostReleaseFn (not via
   // HANDLE_TABLE). See bex_external_types::host_value.
   HOST_VALUE_CALLABLE = 15;
-  // Host-owned opaque error value (a native exception with no BAML
-  // representation), referenced via the same per-bridge registry and
-  // HostReleaseFn lifetime as HOST_VALUE_CALLABLE. Surfaced in BAML as
-  // baml.errors.HostCallable. See bex_external_types::host_value.
-  HOST_VALUE_ERROR = 16;
+  // Host-owned opaque value: an arbitrary host object with no BAML
+  // representation, referenced via the per-bridge HostValueRegistry and
+  // released via HostReleaseFn (not via HANDLE_TABLE), same as
+  // HOST_VALUE_CALLABLE. A host-thrown native exception is one consumer:
+  // the bridge registers it as an opaque value and wraps the handle in a
+  // baml.errors.HostCallable instance for throw semantics. See
+  // bex_external_types::host_value.
+  HOST_VALUE_OPAQUE = 16;
 }
 
 message BamlHandle {
diff --git a/baml_language/crates/bridge_wasm/src/handle.rs b/baml_language/crates/bridge_wasm/src/handle.rs
index 6e52e0013e..35f4db58f9 100644
--- a/baml_language/crates/bridge_wasm/src/handle.rs
+++ b/baml_language/crates/bridge_wasm/src/handle.rs
@@ -22,8 +22,8 @@ fn type_name(ht: BamlHandleType) -> &'static str {
         // Host-owned callables are tracked per-bridge, not in HANDLE_TABLE.
         // The key here is the bridge-side identity passed in from the host.
         BamlHandleType::HostValueCallable => "host_value_callable",
-        // Host-owned opaque error values: same per-bridge tracking as callables.
-        BamlHandleType::HostValueError => "host_value_error",
+        // Host-owned opaque values: same per-bridge tracking as callables.
+        BamlHandleType::HostValueOpaque => "host_value_opaque",
     }
 }
 
@@ -109,7 +109,7 @@ impl BamlHandle {
 
 impl Drop for BamlHandle {
     fn drop(&mut self) {
-        // Host-owned handles (`HostValueCallable`, `HostValueError`) are
+        // Host-owned handles (`HostValueCallable`, `HostValueOpaque`) are
         // *not* tracked in HANDLE_TABLE — their lifetime is managed
         // per-bridge via the `HostReleaseFn` dispatch. Releasing them here
         // would call into the global HANDLE_TABLE with a key that may
@@ -118,7 +118,7 @@ impl Drop for BamlHandle {
         // it. Skip the table release for those variants; their owners drop
         // them through their own release path.
         match self.handle_type {
-            BamlHandleType::HostValueCallable | BamlHandleType::HostValueError => {}
+            BamlHandleType::HostValueCallable | BamlHandleType::HostValueOpaque => {}
             _ => {
                 let _ = HANDLE_TABLE.release(self.key);
             }
diff --git a/baml_language/crates/bridge_wasm/tests/host_callable.rs b/baml_language/crates/bridge_wasm/tests/host_callable.rs
index a9b102c2c2..299f74e683 100644
--- a/baml_language/crates/bridge_wasm/tests/host_callable.rs
+++ b/baml_language/crates/bridge_wasm/tests/host_callable.rs
@@ -372,7 +372,7 @@ fn make_dispatch_error() -> js_sys::Function {
                 value: Some(InboundValue {
                     value: Some(InboundVariant::Handle(BamlHandle {
                         key: UNRESOLVED_HOST_ERROR_KEY,
-                        handle_type: BamlHandleType::HostValueError as i32,
+                        handle_type: BamlHandleType::HostValueOpaque as i32,
                     })),
                 }),
             };
diff --git a/baml_language/crates/sys_native/src/host_impls.rs b/baml_language/crates/sys_native/src/host_impls.rs
index 11c8976cfc..f96a26fd92 100644
--- a/baml_language/crates/sys_native/src/host_impls.rs
+++ b/baml_language/crates/sys_native/src/host_impls.rs
@@ -67,8 +67,9 @@ impl io::IoNamespaceHost for NativeSysOps {
         // Extract the HostValueArc from the incoming handle and confirm
         // it's a callable. Only `HostValueKind::Callable` is dispatchable —
         // the bridge's dispatcher invokes a host *function* through this
-        // path. An `HostValueKind::Error` arc represents an opaque
-        // host-thrown exception and has no callable identity; dispatching
+        // path. An `HostValueKind::Opaque` arc represents an opaque
+        // host value (e.g. a host-thrown exception) and has no callable
+        // identity; dispatching
         // it would either find no entry in the bridge's callable registry
         // (returning a confusing "no callable for key" error) or, worse,
         // collide with a callable that happens to share its key. Reject
@@ -358,7 +359,7 @@ mod tests {
                     language: Some("python".to_string()),
                     handle: bex_resource_types::HostValueArc::new(
                         42,
-                        bex_resource_types::HostValueKind::Error,
+                        bex_resource_types::HostValueKind::Opaque,
                     ),
                 },
             ),
diff --git a/baml_language/crates/sys_types/src/lib.rs b/baml_language/crates/sys_types/src/lib.rs
index 1863e97bf9..ae319907bf 100644
--- a/baml_language/crates/sys_types/src/lib.rs
+++ b/baml_language/crates/sys_types/src/lib.rs
@@ -1173,7 +1173,7 @@ mod tests {
                 language: None,
                 handle: bex_external_types::HostValueArc::new(
                     1,
-                    bex_external_types::HostValueKind::Error,
+                    bex_external_types::HostValueKind::Opaque,
                 ),
             },
         ];
diff --git a/baml_language/sdks/go/bridge_go/cffi/proto/baml_core/cffi/v1/baml_inbound.pb.go b/baml_language/sdks/go/bridge_go/cffi/proto/baml_core/cffi/v1/baml_inbound.pb.go
index 362c211994..e6c6917698 100644
--- a/baml_language/sdks/go/bridge_go/cffi/proto/baml_core/cffi/v1/baml_inbound.pb.go
+++ b/baml_language/sdks/go/bridge_go/cffi/proto/baml_core/cffi/v1/baml_inbound.pb.go
@@ -62,11 +62,14 @@ const (
 	// Lifetime: Rust drop notifies host via HostReleaseFn (not via
 	// HANDLE_TABLE). See bex_external_types::host_value.
 	BamlHandleType_HOST_VALUE_CALLABLE BamlHandleType = 15
-	// Host-owned opaque error value (a native exception with no BAML
-	// representation), referenced via the same per-bridge registry and
-	// HostReleaseFn lifetime as HOST_VALUE_CALLABLE. Surfaced in BAML as
-	// baml.errors.HostCallable. See bex_external_types::host_value.
-	BamlHandleType_HOST_VALUE_ERROR BamlHandleType = 16
+	// Host-owned opaque value: an arbitrary host object with no BAML
+	// representation, referenced via the per-bridge HostValueRegistry and
+	// released via HostReleaseFn (not via HANDLE_TABLE), same as
+	// HOST_VALUE_CALLABLE. A host-thrown native exception is one consumer:
+	// the bridge registers it as an opaque value and wraps the handle in a
+	// baml.errors.HostCallable instance for throw semantics. See
+	// bex_external_types::host_value.
+	BamlHandleType_HOST_VALUE_OPAQUE BamlHandleType = 16
 )
 
 // Enum value maps for BamlHandleType.
@@ -86,7 +89,7 @@ var (
 		13: "ADT_TYPE",
 		14: "ADT_TAGGED_HEAP_HANDLE",
 		15: "HOST_VALUE_CALLABLE",
-		16: "HOST_VALUE_ERROR",
+		16: "HOST_VALUE_OPAQUE",
 	}
 	BamlHandleType_value = map[string]int32{
 		"HANDLE_UNSPECIFIED":     0,
@@ -103,7 +106,7 @@ var (
 		"ADT_TYPE":               13,
 		"ADT_TAGGED_HEAP_HANDLE": 14,
 		"HOST_VALUE_CALLABLE":    15,
-		"HOST_VALUE_ERROR":       16,
+		"HOST_VALUE_OPAQUE":      16,
 	}
 )
 
@@ -938,7 +941,7 @@ var file_baml_core_cffi_v1_baml_inbound_proto_rawDesc = []byte{
 	0x64, 0x18, 0x02, 0x20, 0x01, 0x28, 0x04, 0x52, 0x06, 0x63, 0x61, 0x6c, 0x6c, 0x49, 0x64, 0x22,
 	0x2d, 0x0a, 0x07, 0x43, 0x61, 0x6c, 0x6c, 0x41, 0x63, 0x6b, 0x12, 0x16, 0x0a, 0x05, 0x65, 0x72,
 	0x72, 0x6f, 0x72, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x48, 0x00, 0x52, 0x05, 0x65, 0x72, 0x72,
-	0x6f, 0x72, 0x42, 0x0a, 0x0a, 0x08, 0x72, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x2a, 0xde,
+	0x6f, 0x72, 0x42, 0x0a, 0x0a, 0x08, 0x72, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x2a, 0xdf,
 	0x02, 0x0a, 0x0e, 0x42, 0x61, 0x6d, 0x6c, 0x48, 0x61, 0x6e, 0x64, 0x6c, 0x65, 0x54, 0x79, 0x70,
 	0x65, 0x12, 0x16, 0x0a, 0x12, 0x48, 0x41, 0x4e, 0x44, 0x4c, 0x45, 0x5f, 0x55, 0x4e, 0x53, 0x50,
 	0x45, 0x43, 0x49, 0x46, 0x49, 0x45, 0x44, 0x10, 0x00, 0x12, 0x16, 0x0a, 0x12, 0x55, 0x4e, 0x54,
@@ -958,11 +961,11 @@ var file_baml_core_cffi_v1_baml_inbound_proto_rawDesc = []byte{
 	0x54, 0x5f, 0x54, 0x59, 0x50, 0x45, 0x10, 0x0d, 0x12, 0x1a, 0x0a, 0x16, 0x41, 0x44, 0x54, 0x5f,
 	0x54, 0x41, 0x47, 0x47, 0x45, 0x44, 0x5f, 0x48, 0x45, 0x41, 0x50, 0x5f, 0x48, 0x41, 0x4e, 0x44,
 	0x4c, 0x45, 0x10, 0x0e, 0x12, 0x17, 0x0a, 0x13, 0x48, 0x4f, 0x53, 0x54, 0x5f, 0x56, 0x41, 0x4c,
-	0x55, 0x45, 0x5f, 0x43, 0x41, 0x4c, 0x4c, 0x41, 0x42, 0x4c, 0x45, 0x10, 0x0f, 0x12, 0x14, 0x0a,
-	0x10, 0x48, 0x4f, 0x53, 0x54, 0x5f, 0x56, 0x41, 0x4c, 0x55, 0x45, 0x5f, 0x45, 0x52, 0x52, 0x4f,
-	0x52, 0x10, 0x10, 0x22, 0x04, 0x08, 0x03, 0x10, 0x03, 0x22, 0x04, 0x08, 0x04, 0x10, 0x04, 0x42,
-	0x08, 0x5a, 0x06, 0x2e, 0x2f, 0x63, 0x66, 0x66, 0x69, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f,
-	0x33,
+	0x55, 0x45, 0x5f, 0x43, 0x41, 0x4c, 0x4c, 0x41, 0x42, 0x4c, 0x45, 0x10, 0x0f, 0x12, 0x15, 0x0a,
+	0x11, 0x48, 0x4f, 0x53, 0x54, 0x5f, 0x56, 0x41, 0x4c, 0x55, 0x45, 0x5f, 0x4f, 0x50, 0x41, 0x51,
+	0x55, 0x45, 0x10, 0x10, 0x22, 0x04, 0x08, 0x03, 0x10, 0x03, 0x22, 0x04, 0x08, 0x04, 0x10, 0x04,
+	0x42, 0x08, 0x5a, 0x06, 0x2e, 0x2f, 0x63, 0x66, 0x66, 0x69, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74,
+	0x6f, 0x33,
 }
 
 var (
diff --git a/baml_language/sdks/nodejs/bridge_nodejs/dist/host_error_registry.d.ts.map b/baml_language/sdks/nodejs/bridge_nodejs/dist/host_error_registry.d.ts.map
deleted file mode 100644
index 44d757d752..0000000000
--- a/baml_language/sdks/nodejs/bridge_nodejs/dist/host_error_registry.d.ts.map
+++ /dev/null
@@ -1 +0,0 @@
-{"version":3,"file":"host_error_registry.d.ts","sourceRoot":"","sources":["../typescript_src/host_error_registry.ts"],"names":[],"mappings":"AAmCA,OAAO,EAA8D,KAAK,SAAS,EAAE,MAAM,aAAa,CAAC;AA4BzG;;;;;;;;;;;;;GAaG;AACH,wBAAgB,iBAAiB,CAAC,GAAG,EAAE,OAAO,GAAG,SAAS,CAIzD;AAED;;;;;;;;;;;;;;;;;;;;GAoBG;AACH,wBAAgB,eAAe,CAAC,GAAG,EAAE,MAAM,GAAG,OAAO,CAEpD;AAED;;;;;;;;;GASG;AACH,wBAAgB,sBAAsB,CAAC,MAAM,EAAE,OAAO,GAAG,OAAO,CAI/D"}
\ No newline at end of file
diff --git a/baml_language/sdks/nodejs/bridge_nodejs/dist/host_error_registry.js.map b/baml_language/sdks/nodejs/bridge_nodejs/dist/host_error_registry.js.map
deleted file mode 100644
index 74c261bd50..0000000000
--- a/baml_language/sdks/nodejs/bridge_nodejs/dist/host_error_registry.js.map
+++ /dev/null
@@ -1 +0,0 @@
-{"version":3,"file":"host_error_registry.js","sourceRoot":"","sources":["../typescript_src/host_error_registry.ts"],"names":[],"mappings":"AAAA,yEAAyE;AACzE,8BAA8B;AAC9B,EAAE;AACF,0EAA0E;AAC1E,4EAA4E;AAC5E,+EAA+E;AAC/E,yBAAyB;AACzB,EAAE;AACF,yEAAyE;AACzE,2DAA2D;AAC3D,2DAA2D;AAC3D,yEAAyE;AACzE,yEAAyE;AACzE,0EAA0E;AAC1E,gFAAgF;AAChF,0EAA0E;AAC1E,wDAAwD;AACxD,yEAAyE;AACzE,0EAA0E;AAC1E,yEAAyE;AACzE,6EAA6E;AAC7E,8BAA8B;AAC9B,yEAAyE;AACzE,uEAAuE;AACvE,gFAAgF;AAChF,qCAAqC;AACrC,EAAE;AACF,2EAA2E;AAC3E,qEAAqE;AACrE,4EAA4E;AAC5E,qEAAqE;AACrE,yEAAyE;AACzE,sEAAsE;AACtE,oDAAoD;AAEpD,OAAO,EAAE,gBAAgB,EAAE,4BAA4B,EAAE,UAAU,EAAkB,MAAM,aAAa,CAAC;AACzG,OAAO,EAAE,SAAS,EAAE,MAAM,sBAAsB,CAAC;AAEjD,MAAM,cAAc,GAAG,SAAS,CAAC,IAAI,CAAC,EAAE,CAAC,cAAc,CAAC;AAExD,MAAM,QAAQ,GAAG,IAAI,GAAG,EAAmB,CAAC;AAE5C;;;;;;;;;;;;;;GAcG;AACH,SAAS,iBAAiB,CAAC,GAAc;IACrC,MAAM,GAAG,GAAG,MAAM,CAAC,GAAG,CAAC,GAAG,KAAK,CAAC,CAAC,CAAC;IAClC,MAAM,IAAI,GAAG,MAAM,CAAC,GAAG,CAAC,IAAI,KAAK,CAAC,CAAC,CAAC;IACpC,OAAO,CAAC,IAAI,IAAI,GAAG,CAAC,GAAG,GAAG,CAAC;AAC/B,CAAC;AAED;;;;;;;;;;;;;GAaG;AACH,MAAM,UAAU,iBAAiB,CAAC,GAAY;IAC1C,MAAM,GAAG,GAAG,gBAAgB,EAAE,CAAC;IAC/B,QAAQ,CAAC,GAAG,CAAC,iBAAiB,CAAC,GAAG,CAAC,EAAE,GAAG,CAAC,CAAC;IAC1C,OAAO,GAAG,CAAC;AACf,CAAC;AAED;;;;;;;;;;;;;;;;;;;;GAoBG;AACH,MAAM,UAAU,eAAe,CAAC,GAAW;IACvC,OAAO,QAAQ,CAAC,GAAG,CAAC,GAAG,CAAC,CAAC;AAC7B,CAAC;AAED;;;;;;;;;GASG;AACH,MAAM,UAAU,sBAAsB,CAAC,MAAe;IAClD,IAAI,CAAC,CAAC,MAAM,YAAY,UAAU,CAAC;QAAE,OAAO,SAAS,CAAC;IACtD,IAAI,MAAM,CAAC,UAAU,KAAK,cAAc,CAAC,gBAAgB;QAAE,OAAO,SAAS,CAAC;IAC5E,OAAO,eAAe,CAAC,iBAAiB,CAAC,MAAM,CAAC,GAAG,CAAC,CAAC,CAAC;AAC1D,CAAC;AAED;;;;;GAKG;AACH,SAAS,iBAAiB,CAAC,GAAc;IACrC,QAAQ,CAAC,MAAM,CAAC,iBAAiB,CAAC,GAAG,CAAC,CAAC,CAAC;AAC5C,CAAC;AAED,0EAA0E;AAC1E,uEAAuE;AACvE,sCAAsC;AACtC,4BAA4B,CAAC,iBAAiB,CAAC,CAAC"}
\ No newline at end of file
diff --git a/baml_language/sdks/nodejs/bridge_nodejs/dist/host_error_registry.d.ts b/baml_language/sdks/nodejs/bridge_nodejs/dist/host_value_registry.d.ts
similarity index 68%
rename from baml_language/sdks/nodejs/bridge_nodejs/dist/host_error_registry.d.ts
rename to baml_language/sdks/nodejs/bridge_nodejs/dist/host_value_registry.d.ts
index a6b86d13b1..edaf856b0d 100644
--- a/baml_language/sdks/nodejs/bridge_nodejs/dist/host_error_registry.d.ts
+++ b/baml_language/sdks/nodejs/bridge_nodejs/dist/host_value_registry.d.ts
@@ -7,12 +7,12 @@
  */
 import { type HandleKey } from './native.js';
 /**
- * Register a JS error object and return its native `HandleKey` for the
- * `_handle: Handle(HOST_VALUE_ERROR, key)` slot of a
- * `baml.errors.HostCallable` Instance. Mints a fresh key via the Rust
- * side's shared counter (guaranteed non-zero — Rust `next_key` skips
- * `0`); stores the error keyed by the same key (recomposed as a
- * `bigint` for `Map`-key equality).
+ * Register an arbitrary host JS value and return its native `HandleKey` for
+ * the `_handle: Handle(HOST_VALUE_OPAQUE, key)` slot of a
+ * `baml.errors.HostCallable` Instance (or any future opaque-value carrier).
+ * Mints a fresh key via the Rust side's shared counter (guaranteed non-zero —
+ * Rust `next_key` skips `0`); stores the value keyed by the same key
+ * (recomposed as a `bigint` for `Map`-key equality).
  *
  * Returns the native `HandleKey` directly so it can flow into the
  * protobufjs encoder without an intermediate `bigint→Long` conversion
@@ -20,12 +20,12 @@ import { type HandleKey } from './native.js';
  * the native `HandleKey` already provides; a bare `bigint` does not
  * encode correctly through the `IInboundValue.handle.key` field).
  */
-export declare function registerHostError(err: unknown): HandleKey;
+export declare function registerHostOpaque(value: unknown): HandleKey;
 /**
- * Look up a host-registered JS error by key. Returns `undefined` when:
- * - the key is the reserved sentinel `0n` (no real error was registered);
+ * Look up a host-registered JS value by key. Returns `undefined` when:
+ * - the key is the reserved sentinel `0n` (no real value was registered);
  * - the engine has already released the entry (last `HostValueArc` clone
- *   dropped → Rust `host_release_callback` fired → `_releaseHostError`
+ *   dropped → Rust `host_release_callback` fired → `_releaseHostValue`
  *   removed the entry);
  * - the key was minted by a different Node process (cross-runtime handle).
  *
@@ -37,15 +37,15 @@ export declare function registerHostError(err: unknown): HandleKey;
  * emitting an outbound proto referencing its key — the outbound encode
  * holds a strong handle through proto serialization, and the release tsfn
  * isn't fired until that strong handle drops. By the time the TS decoder
- * runs `tryRehydrateFromHandle`, the only way the map entry is gone is if
+ * runs `tryRehydrateHostValueByKey`, the only way the map entry is gone is if
  * a *prior* outbound completed and the engine has since dropped its last
  * Arc; in that case the user has already observed the original throw at
  * least once, so a second lookup-miss → metadata-fallback is acceptable.
  */
-export declare function lookupHostError(key: bigint): unknown;
+export declare function lookupHostValue(key: bigint): unknown;
 /**
  * Convenience for the outbound decoder: if `handle` is a `BamlHandle`
- * tagged `HOST_VALUE_ERROR`, look up the originating JS error object in
+ * tagged `HOST_VALUE_OPAQUE`, look up the originating JS value in
  * the registry and return it. Returns `undefined` for any other handle
  * type, a non-`BamlHandle` argument, or a key that doesn't resolve.
  *
@@ -53,5 +53,5 @@ export declare function lookupHostError(key: bigint): unknown;
  * exception when a BAML-thrown `baml.errors.HostCallable` propagates back
  * to the same Node process that originated it.
  */
-export declare function tryRehydrateFromHandle(handle: unknown): unknown;
-//# sourceMappingURL=host_error_registry.d.ts.map
\ No newline at end of file
+export declare function tryRehydrateHostValueByKey(handle: unknown): unknown;
+//# sourceMappingURL=host_value_registry.d.ts.map
\ No newline at end of file
diff --git a/baml_language/sdks/nodejs/bridge_nodejs/dist/host_value_registry.d.ts.map b/baml_language/sdks/nodejs/bridge_nodejs/dist/host_value_registry.d.ts.map
new file mode 100644
index 0000000000..14063d7710
--- /dev/null
+++ b/baml_language/sdks/nodejs/bridge_nodejs/dist/host_value_registry.d.ts.map
@@ -0,0 +1 @@
+{"version":3,"file":"host_value_registry.d.ts","sourceRoot":"","sources":["../typescript_src/host_value_registry.ts"],"names":[],"mappings":"AAqCA,OAAO,EAAkE,KAAK,SAAS,EAAE,MAAM,aAAa,CAAC;AA4B7G;;;;;;;;;;;;;GAaG;AACH,wBAAgB,kBAAkB,CAAC,KAAK,EAAE,OAAO,GAAG,SAAS,CAI5D;AAED;;;;;;;;;;;;;;;;;;;;GAoBG;AACH,wBAAgB,eAAe,CAAC,GAAG,EAAE,MAAM,GAAG,OAAO,CAEpD;AAED;;;;;;;;;GASG;AACH,wBAAgB,0BAA0B,CAAC,MAAM,EAAE,OAAO,GAAG,OAAO,CAInE"}
\ No newline at end of file
diff --git a/baml_language/sdks/nodejs/bridge_nodejs/dist/host_error_registry.js b/baml_language/sdks/nodejs/bridge_nodejs/dist/host_value_registry.js
similarity index 63%
rename from baml_language/sdks/nodejs/bridge_nodejs/dist/host_error_registry.js
rename to baml_language/sdks/nodejs/bridge_nodejs/dist/host_value_registry.js
index 0a33724498..f8ad753f1a 100644
--- a/baml_language/sdks/nodejs/bridge_nodejs/dist/host_error_registry.js
+++ b/baml_language/sdks/nodejs/bridge_nodejs/dist/host_value_registry.js
@@ -5,44 +5,46 @@
  * Proto:  baml_language/crates/bridge_ctypes/types/baml_core/cffi/v1/*.proto
  * Build:  cd baml_language/crates/bridge_nodejs && pnpm build:debug
  */
-// host_error_registry.ts — mirrors bridge_python's `register_host_error`
+// host_value_registry.ts — mirrors bridge_python's `register_host_opaque`
 // + `lookup_host_value` pair.
 //
-// A native JS exception raised inside a user callable round-trips back to
-// the *same* Node process as the *same* `Error` object (`raised === caught`
-// identity), not flattened into a metadata-only `BamlError(HostCallable(...))`
-// wrapper. The plumbing:
+// An arbitrary host JS value round-trips back to the *same* Node process as
+// the *same* object (identity preserved), not flattened into a metadata-only
+// wrapper. A native JS exception raised inside a user callable is the primary
+// consumer: it round-trips as the *same* `Error` object (`raised === caught`
+// identity), not a metadata-only `BamlError(HostCallable(...))` wrapper. The
+// plumbing:
 //
 //   1. The TS bridge catches the JS error inside `sendHostCallableError`
-//      (proto.ts) and calls `registerHostError(err)` here.
-//   2. `registerHostError` mints a globally-unique key via
-//      `native.mintHostErrorKey` (drawing from the shared callable+error
+//      (proto.ts) and calls `registerHostOpaque(err)` here.
+//   2. `registerHostOpaque` mints a globally-unique key via
+//      `native.mintHostValueKey` (drawing from the shared callable+opaque
 //      counter on the Rust side so the engine sees one keyspace), stores
-//      the JS error in the local `Map<bigint, unknown>`, returns the key.
+//      the JS value in the local `Map<bigint, unknown>`, returns the key.
 //   3. The bridge emits an `InboundValue.Class(name="baml.errors.HostCallable",
-//      fields=[..., _handle: Handle(HOST_VALUE_ERROR, key)])`. The engine
+//      fields=[..., _handle: Handle(HOST_VALUE_OPAQUE, key)])`. The engine
 //      interns an `Arc<HostValueArc>` per the same key.
 //   4. When BAML propagates the throw back out to the host, the outbound
-//      encoder re-emits the `_handle: Handle(HOST_VALUE_ERROR, key)`. The
+//      encoder re-emits the `_handle: Handle(HOST_VALUE_OPAQUE, key)`. The
 //      TS decoder (proto.ts) inspects a decoded `HostCallable` instance,
-//      reads `_handle.key`, calls `lookupHostError(key)` here, and re-throws
+//      reads `_handle.key`, calls `lookupHostValue(key)` here, and re-throws
 //      the original JS error.
 //   5. When the engine drops its last `Arc<HostValueArc>(key)`, the Rust
 //      `host_release_callback` fires the TS-installed release callback
-//      (`native.registerErrorReleaseCallback`), which calls `_releaseHostError`
+//      (`native.registerHostValueReleaseCallback`), which calls `_releaseHostValue`
 //      here to remove the map entry.
 //
 // Foreign runtimes (a different Node process, the Python bridge, etc.) see
 // a `_handle` whose key doesn't resolve in their local registry; the
 // decoder falls back to the metadata-bearing `BamlError(HostCallable(...))`
 // wrapper. The reserved `0` is used as a sentinel by code paths that
-// cannot register a real JS error (engine-internal synthetic faults like
-// "no JS callable for this key"); `_releaseHostError(0n)` is a benign
-// no-op since `mintHostErrorKey` never returns `0`.
-import { mintHostErrorKey, registerErrorReleaseCallback, BamlHandle } from './native.js';
+// cannot register a real JS value (engine-internal synthetic faults like
+// "no JS callable for this key"); `_releaseHostValue(0n)` is a benign
+// no-op since `mintHostValueKey` never returns `0`.
+import { mintHostValueKey, registerHostValueReleaseCallback, BamlHandle } from './native.js';
 import { baml_core } from './proto/baml_cffi.js';
 const BamlHandleType = baml_core.cffi.v1.BamlHandleType;
-const errorMap = new Map();
+const hostValueMap = new Map();
 /**
  * Convert a `HandleKey` (`{ low, high }`) to a `bigint` for use as a `Map` key.
  * Native `HandleKey` instances split a `u64` across two `i32` low/high halves
@@ -64,12 +66,12 @@ function handleKeyToBigint(key) {
     return (high << 32n) | low;
 }
 /**
- * Register a JS error object and return its native `HandleKey` for the
- * `_handle: Handle(HOST_VALUE_ERROR, key)` slot of a
- * `baml.errors.HostCallable` Instance. Mints a fresh key via the Rust
- * side's shared counter (guaranteed non-zero — Rust `next_key` skips
- * `0`); stores the error keyed by the same key (recomposed as a
- * `bigint` for `Map`-key equality).
+ * Register an arbitrary host JS value and return its native `HandleKey` for
+ * the `_handle: Handle(HOST_VALUE_OPAQUE, key)` slot of a
+ * `baml.errors.HostCallable` Instance (or any future opaque-value carrier).
+ * Mints a fresh key via the Rust side's shared counter (guaranteed non-zero —
+ * Rust `next_key` skips `0`); stores the value keyed by the same key
+ * (recomposed as a `bigint` for `Map`-key equality).
  *
  * Returns the native `HandleKey` directly so it can flow into the
  * protobufjs encoder without an intermediate `bigint→Long` conversion
@@ -77,16 +79,16 @@ function handleKeyToBigint(key) {
  * the native `HandleKey` already provides; a bare `bigint` does not
  * encode correctly through the `IInboundValue.handle.key` field).
  */
-export function registerHostError(err) {
-    const key = mintHostErrorKey();
-    errorMap.set(handleKeyToBigint(key), err);
+export function registerHostOpaque(value) {
+    const key = mintHostValueKey();
+    hostValueMap.set(handleKeyToBigint(key), value);
     return key;
 }
 /**
- * Look up a host-registered JS error by key. Returns `undefined` when:
- * - the key is the reserved sentinel `0n` (no real error was registered);
+ * Look up a host-registered JS value by key. Returns `undefined` when:
+ * - the key is the reserved sentinel `0n` (no real value was registered);
  * - the engine has already released the entry (last `HostValueArc` clone
- *   dropped → Rust `host_release_callback` fired → `_releaseHostError`
+ *   dropped → Rust `host_release_callback` fired → `_releaseHostValue`
  *   removed the entry);
  * - the key was minted by a different Node process (cross-runtime handle).
  *
@@ -98,17 +100,17 @@ export function registerHostError(err) {
  * emitting an outbound proto referencing its key — the outbound encode
  * holds a strong handle through proto serialization, and the release tsfn
  * isn't fired until that strong handle drops. By the time the TS decoder
- * runs `tryRehydrateFromHandle`, the only way the map entry is gone is if
+ * runs `tryRehydrateHostValueByKey`, the only way the map entry is gone is if
  * a *prior* outbound completed and the engine has since dropped its last
  * Arc; in that case the user has already observed the original throw at
  * least once, so a second lookup-miss → metadata-fallback is acceptable.
  */
-export function lookupHostError(key) {
-    return errorMap.get(key);
+export function lookupHostValue(key) {
+    return hostValueMap.get(key);
 }
 /**
  * Convenience for the outbound decoder: if `handle` is a `BamlHandle`
- * tagged `HOST_VALUE_ERROR`, look up the originating JS error object in
+ * tagged `HOST_VALUE_OPAQUE`, look up the originating JS value in
  * the registry and return it. Returns `undefined` for any other handle
  * type, a non-`BamlHandle` argument, or a key that doesn't resolve.
  *
@@ -116,24 +118,24 @@ export function lookupHostError(key) {
  * exception when a BAML-thrown `baml.errors.HostCallable` propagates back
  * to the same Node process that originated it.
  */
-export function tryRehydrateFromHandle(handle) {
+export function tryRehydrateHostValueByKey(handle) {
     if (!(handle instanceof BamlHandle))
         return undefined;
-    if (handle.handleType !== BamlHandleType.HOST_VALUE_ERROR)
+    if (handle.handleType !== BamlHandleType.HOST_VALUE_OPAQUE)
         return undefined;
-    return lookupHostError(handleKeyToBigint(handle.key));
+    return lookupHostValue(handleKeyToBigint(handle.key));
 }
 /**
  * Internal: remove the map entry for `key`. Wired at module init as the
  * Rust-side release callback. Idempotent and absent-key-safe so the same
  * callback can be invoked for *every* `HostValueArc` release (including
- * callable keys, which never have a TS-side error entry).
+ * callable keys, which never have a TS-side host-value entry).
  */
-function _releaseHostError(key) {
-    errorMap.delete(handleKeyToBigint(key));
+function _releaseHostValue(key) {
+    hostValueMap.delete(handleKeyToBigint(key));
 }
 // Install the Rust-side release callback exactly once at module load. The
 // napi function is itself first-call-wins on the Rust side, so reloads
 // (e.g. test harnesses) are harmless.
-registerErrorReleaseCallback(_releaseHostError);
-//# sourceMappingURL=host_error_registry.js.map
\ No newline at end of file
+registerHostValueReleaseCallback(_releaseHostValue);
+//# sourceMappingURL=host_value_registry.js.map
\ No newline at end of file
diff --git a/baml_language/sdks/nodejs/bridge_nodejs/dist/host_value_registry.js.map b/baml_language/sdks/nodejs/bridge_nodejs/dist/host_value_registry.js.map
new file mode 100644
index 0000000000..b380a61329
--- /dev/null
+++ b/baml_language/sdks/nodejs/bridge_nodejs/dist/host_value_registry.js.map
@@ -0,0 +1 @@
+{"version":3,"file":"host_value_registry.js","sourceRoot":"","sources":["../typescript_src/host_value_registry.ts"],"names":[],"mappings":"AAAA,0EAA0E;AAC1E,8BAA8B;AAC9B,EAAE;AACF,4EAA4E;AAC5E,6EAA6E;AAC7E,8EAA8E;AAC9E,6EAA6E;AAC7E,6EAA6E;AAC7E,YAAY;AACZ,EAAE;AACF,yEAAyE;AACzE,4DAA4D;AAC5D,4DAA4D;AAC5D,0EAA0E;AAC1E,yEAAyE;AACzE,0EAA0E;AAC1E,gFAAgF;AAChF,2EAA2E;AAC3E,wDAAwD;AACxD,yEAAyE;AACzE,2EAA2E;AAC3E,yEAAyE;AACzE,6EAA6E;AAC7E,8BAA8B;AAC9B,yEAAyE;AACzE,uEAAuE;AACvE,oFAAoF;AACpF,qCAAqC;AACrC,EAAE;AACF,2EAA2E;AAC3E,qEAAqE;AACrE,4EAA4E;AAC5E,qEAAqE;AACrE,yEAAyE;AACzE,sEAAsE;AACtE,oDAAoD;AAEpD,OAAO,EAAE,gBAAgB,EAAE,gCAAgC,EAAE,UAAU,EAAkB,MAAM,aAAa,CAAC;AAC7G,OAAO,EAAE,SAAS,EAAE,MAAM,sBAAsB,CAAC;AAEjD,MAAM,cAAc,GAAG,SAAS,CAAC,IAAI,CAAC,EAAE,CAAC,cAAc,CAAC;AAExD,MAAM,YAAY,GAAG,IAAI,GAAG,EAAmB,CAAC;AAEhD;;;;;;;;;;;;;;GAcG;AACH,SAAS,iBAAiB,CAAC,GAAc;IACrC,MAAM,GAAG,GAAG,MAAM,CAAC,GAAG,CAAC,GAAG,KAAK,CAAC,CAAC,CAAC;IAClC,MAAM,IAAI,GAAG,MAAM,CAAC,GAAG,CAAC,IAAI,KAAK,CAAC,CAAC,CAAC;IACpC,OAAO,CAAC,IAAI,IAAI,GAAG,CAAC,GAAG,GAAG,CAAC;AAC/B,CAAC;AAED;;;;;;;;;;;;;GAaG;AACH,MAAM,UAAU,kBAAkB,CAAC,KAAc;IAC7C,MAAM,GAAG,GAAG,gBAAgB,EAAE,CAAC;IAC/B,YAAY,CAAC,GAAG,CAAC,iBAAiB,CAAC,GAAG,CAAC,EAAE,KAAK,CAAC,CAAC;IAChD,OAAO,GAAG,CAAC;AACf,CAAC;AAED;;;;;;;;;;;;;;;;;;;;GAoBG;AACH,MAAM,UAAU,eAAe,CAAC,GAAW;IACvC,OAAO,YAAY,CAAC,GAAG,CAAC,GAAG,CAAC,CAAC;AACjC,CAAC;AAED;;;;;;;;;GASG;AACH,MAAM,UAAU,0BAA0B,CAAC,MAAe;IACtD,IAAI,CAAC,CAAC,MAAM,YAAY,UAAU,CAAC;QAAE,OAAO,SAAS,CAAC;IACtD,IAAI,MAAM,CAAC,UAAU,KAAK,cAAc,CAAC,iBAAiB;QAAE,OAAO,SAAS,CAAC;IAC7E,OAAO,eAAe,CAAC,iBAAiB,CAAC,MAAM,CAAC,GAAG,CAAC,CAAC,CAAC;AAC1D,CAAC;AAED;;;;;GAKG;AACH,SAAS,iBAAiB,CAAC,GAAc;IACrC,YAAY,CAAC,MAAM,CAAC,iBAAiB,CAAC,GAAG,CAAC,CAAC,CAAC;AAChD,CAAC;AAED,0EAA0E;AAC1E,uEAAuE;AACvE,sCAAsC;AACtC,gCAAgC,CAAC,iBAAiB,CAAC,CAAC"}
\ No newline at end of file
diff --git a/baml_language/sdks/nodejs/bridge_nodejs/dist/native.d.ts b/baml_language/sdks/nodejs/bridge_nodejs/dist/native.d.ts
index 29ea350532..0c0d0f1596 100644
--- a/baml_language/sdks/nodejs/bridge_nodejs/dist/native.d.ts
+++ b/baml_language/sdks/nodejs/bridge_nodejs/dist/native.d.ts
@@ -242,19 +242,33 @@ export interface HandleKey {
 }
 
 /**
- * Mint a fresh host-value key, drawing from the shared callable+error
+ * Mint a fresh host-value key, drawing from the shared callable+opaque
  * counter so the engine sees one globally-unique keyspace. Returned to
- * TS by `registerHostError` (the TS-side function in
- * `host_error_registry.ts`).
+ * TS by `registerHostOpaque` (the TS-side function in
+ * `host_value_registry.ts`).
  *
- * Exposed to JS as `mintHostErrorKey() -> HandleKey`. The TS-side error
- * registry calls this once per `registerHostError(err)` before inserting
- * the error into its `Map<bigint, unknown>`.
+ * Exposed to JS as `mintHostValueKey() -> HandleKey`. The TS-side host-value
+ * registry calls this once per `registerHostOpaque(value)` before inserting
+ * the value into its `Map<bigint, unknown>`.
  */
-export declare function mintHostErrorKey(): HandleKey
+export declare function mintHostValueKey(): HandleKey
 
 export declare function newFunctionCall(): string
 
+/**
+ * Register a JS dispatch wrapper in the host-value table and return its key.
+ *
+ * Exposed to JS as `registerHostCallable(fn) -> HandleKey`. Called from
+ * the inbound encoder in `typescript_src/proto.ts` whenever a JS callable
+ * appears as a kwarg — the encoder constructs the dispatch wrapper around
+ * the user's function before calling this.
+ *
+ * The `Function` is converted into a `ThreadsafeFunction` so it can outlive
+ * the napi call scope and be invoked from any thread (the engine's tokio
+ * runtime calls into this entry point from a worker thread).
+ */
+export declare function registerHostCallable(callable: (callId: number, argsBytes: Buffer) => void): HandleKey
+
 /**
  * Install the TS-side release callback. First-call-wins; subsequent
  * calls are a no-op (matching the bridge_cffi dispatch-registration
@@ -278,24 +292,10 @@ export declare function newFunctionCall(): string
  * host callback awaiting completion *must* keep the loop alive so the
  * JS callback can actually run.
  *
- * Exposed to JS as `registerErrorReleaseCallback(cb)`. Must be called
+ * Exposed to JS as `registerHostValueReleaseCallback(cb)`. Must be called
  * exactly once at SDK module init, before any host call is dispatched.
  */
-export declare function registerErrorReleaseCallback(callback: (key: HandleKey) => void): void
-
-/**
- * Register a JS dispatch wrapper in the host-value table and return its key.
- *
- * Exposed to JS as `registerHostCallable(fn) -> HandleKey`. Called from
- * the inbound encoder in `typescript_src/proto.ts` whenever a JS callable
- * appears as a kwarg — the encoder constructs the dispatch wrapper around
- * the user's function before calling this.
- *
- * The `Function` is converted into a `ThreadsafeFunction` so it can outlive
- * the napi call scope and be invoked from any thread (the engine's tokio
- * runtime calls into this entry point from a worker thread).
- */
-export declare function registerHostCallable(callable: (callId: number, argsBytes: Buffer) => void): HandleKey
+export declare function registerHostValueReleaseCallback(callback: (key: HandleKey) => void): void
 
 /**
  * Release a host callable the inbound encoder registered but never handed to
diff --git a/baml_language/sdks/nodejs/bridge_nodejs/dist/native.js b/baml_language/sdks/nodejs/bridge_nodejs/dist/native.js
index e02df7d723..0d72f23313 100644
--- a/baml_language/sdks/nodejs/bridge_nodejs/dist/native.js
+++ b/baml_language/sdks/nodejs/bridge_nodejs/dist/native.js
@@ -88,8 +88,8 @@ function requireNative() {
       try {
         const binding = require('@boundaryml/baml-core-node-android-arm64')
         const bindingPackageVersion = require('@boundaryml/baml-core-node-android-arm64/package.json').version
-        if (bindingPackageVersion !== '0.12.0' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
-          throw new Error(`Native binding package version mismatch, expected 0.12.0 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
+        if (bindingPackageVersion !== '0.12.1' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
+          throw new Error(`Native binding package version mismatch, expected 0.12.1 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
         }
         return binding
       } catch (e) {
@@ -104,8 +104,8 @@ function requireNative() {
       try {
         const binding = require('@boundaryml/baml-core-node-android-arm-eabi')
         const bindingPackageVersion = require('@boundaryml/baml-core-node-android-arm-eabi/package.json').version
-        if (bindingPackageVersion !== '0.12.0' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
-          throw new Error(`Native binding package version mismatch, expected 0.12.0 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
+        if (bindingPackageVersion !== '0.12.1' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
+          throw new Error(`Native binding package version mismatch, expected 0.12.1 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
         }
         return binding
       } catch (e) {
@@ -125,8 +125,8 @@ function requireNative() {
       try {
         const binding = require('@boundaryml/baml-core-node-win32-x64-gnu')
         const bindingPackageVersion = require('@boundaryml/baml-core-node-win32-x64-gnu/package.json').version
-        if (bindingPackageVersion !== '0.12.0' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
-          throw new Error(`Native binding package version mismatch, expected 0.12.0 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
+        if (bindingPackageVersion !== '0.12.1' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
+          throw new Error(`Native binding package version mismatch, expected 0.12.1 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
         }
         return binding
       } catch (e) {
@@ -141,8 +141,8 @@ function requireNative() {
       try {
         const binding = require('@boundaryml/baml-core-node-win32-x64-msvc')
         const bindingPackageVersion = require('@boundaryml/baml-core-node-win32-x64-msvc/package.json').version
-        if (bindingPackageVersion !== '0.12.0' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
-          throw new Error(`Native binding package version mismatch, expected 0.12.0 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
+        if (bindingPackageVersion !== '0.12.1' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
+          throw new Error(`Native binding package version mismatch, expected 0.12.1 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
         }
         return binding
       } catch (e) {
@@ -158,8 +158,8 @@ function requireNative() {
       try {
         const binding = require('@boundaryml/baml-core-node-win32-ia32-msvc')
         const bindingPackageVersion = require('@boundaryml/baml-core-node-win32-ia32-msvc/package.json').version
-        if (bindingPackageVersion !== '0.12.0' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
-          throw new Error(`Native binding package version mismatch, expected 0.12.0 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
+        if (bindingPackageVersion !== '0.12.1' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
+          throw new Error(`Native binding package version mismatch, expected 0.12.1 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
         }
         return binding
       } catch (e) {
@@ -174,8 +174,8 @@ function requireNative() {
       try {
         const binding = require('@boundaryml/baml-core-node-win32-arm64-msvc')
         const bindingPackageVersion = require('@boundaryml/baml-core-node-win32-arm64-msvc/package.json').version
-        if (bindingPackageVersion !== '0.12.0' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
-          throw new Error(`Native binding package version mismatch, expected 0.12.0 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
+        if (bindingPackageVersion !== '0.12.1' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
+          throw new Error(`Native binding package version mismatch, expected 0.12.1 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
         }
         return binding
       } catch (e) {
@@ -193,8 +193,8 @@ function requireNative() {
     try {
       const binding = require('@boundaryml/baml-core-node-darwin-universal')
       const bindingPackageVersion = require('@boundaryml/baml-core-node-darwin-universal/package.json').version
-      if (bindingPackageVersion !== '0.12.0' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
-        throw new Error(`Native binding package version mismatch, expected 0.12.0 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
+      if (bindingPackageVersion !== '0.12.1' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
+        throw new Error(`Native binding package version mismatch, expected 0.12.1 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
       }
       return binding
     } catch (e) {
@@ -209,8 +209,8 @@ function requireNative() {
       try {
         const binding = require('@boundaryml/baml-core-node-darwin-x64')
         const bindingPackageVersion = require('@boundaryml/baml-core-node-darwin-x64/package.json').version
-        if (bindingPackageVersion !== '0.12.0' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
-          throw new Error(`Native binding package version mismatch, expected 0.12.0 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
+        if (bindingPackageVersion !== '0.12.1' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
+          throw new Error(`Native binding package version mismatch, expected 0.12.1 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
         }
         return binding
       } catch (e) {
@@ -225,8 +225,8 @@ function requireNative() {
       try {
         const binding = require('@boundaryml/baml-core-node-darwin-arm64')
         const bindingPackageVersion = require('@boundaryml/baml-core-node-darwin-arm64/package.json').version
-        if (bindingPackageVersion !== '0.12.0' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
-          throw new Error(`Native binding package version mismatch, expected 0.12.0 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
+        if (bindingPackageVersion !== '0.12.1' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
+          throw new Error(`Native binding package version mismatch, expected 0.12.1 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
         }
         return binding
       } catch (e) {
@@ -245,8 +245,8 @@ function requireNative() {
       try {
         const binding = require('@boundaryml/baml-core-node-freebsd-x64')
         const bindingPackageVersion = require('@boundaryml/baml-core-node-freebsd-x64/package.json').version
-        if (bindingPackageVersion !== '0.12.0' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
-          throw new Error(`Native binding package version mismatch, expected 0.12.0 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
+        if (bindingPackageVersion !== '0.12.1' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
+          throw new Error(`Native binding package version mismatch, expected 0.12.1 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
         }
         return binding
       } catch (e) {
@@ -261,8 +261,8 @@ function requireNative() {
       try {
         const binding = require('@boundaryml/baml-core-node-freebsd-arm64')
         const bindingPackageVersion = require('@boundaryml/baml-core-node-freebsd-arm64/package.json').version
-        if (bindingPackageVersion !== '0.12.0' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
-          throw new Error(`Native binding package version mismatch, expected 0.12.0 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
+        if (bindingPackageVersion !== '0.12.1' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
+          throw new Error(`Native binding package version mismatch, expected 0.12.1 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
         }
         return binding
       } catch (e) {
@@ -282,8 +282,8 @@ function requireNative() {
         try {
           const binding = require('@boundaryml/baml-core-node-linux-x64-musl')
           const bindingPackageVersion = require('@boundaryml/baml-core-node-linux-x64-musl/package.json').version
-          if (bindingPackageVersion !== '0.12.0' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
-            throw new Error(`Native binding package version mismatch, expected 0.12.0 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
+          if (bindingPackageVersion !== '0.12.1' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
+            throw new Error(`Native binding package version mismatch, expected 0.12.1 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
           }
           return binding
         } catch (e) {
@@ -298,8 +298,8 @@ function requireNative() {
         try {
           const binding = require('@boundaryml/baml-core-node-linux-x64-gnu')
           const bindingPackageVersion = require('@boundaryml/baml-core-node-linux-x64-gnu/package.json').version
-          if (bindingPackageVersion !== '0.12.0' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
-            throw new Error(`Native binding package version mismatch, expected 0.12.0 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
+          if (bindingPackageVersion !== '0.12.1' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
+            throw new Error(`Native binding package version mismatch, expected 0.12.1 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
           }
           return binding
         } catch (e) {
@@ -316,8 +316,8 @@ function requireNative() {
         try {
           const binding = require('@boundaryml/baml-core-node-linux-arm64-musl')
           const bindingPackageVersion = require('@boundaryml/baml-core-node-linux-arm64-musl/package.json').version
-          if (bindingPackageVersion !== '0.12.0' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
-            throw new Error(`Native binding package version mismatch, expected 0.12.0 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
+          if (bindingPackageVersion !== '0.12.1' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
+            throw new Error(`Native binding package version mismatch, expected 0.12.1 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
           }
           return binding
         } catch (e) {
@@ -332,8 +332,8 @@ function requireNative() {
         try {
           const binding = require('@boundaryml/baml-core-node-linux-arm64-gnu')
           const bindingPackageVersion = require('@boundaryml/baml-core-node-linux-arm64-gnu/package.json').version
-          if (bindingPackageVersion !== '0.12.0' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
-            throw new Error(`Native binding package version mismatch, expected 0.12.0 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
+          if (bindingPackageVersion !== '0.12.1' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
+            throw new Error(`Native binding package version mismatch, expected 0.12.1 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
           }
           return binding
         } catch (e) {
@@ -350,8 +350,8 @@ function requireNative() {
         try {
           const binding = require('@boundaryml/baml-core-node-linux-arm-musleabihf')
           const bindingPackageVersion = require('@boundaryml/baml-core-node-linux-arm-musleabihf/package.json').version
-          if (bindingPackageVersion !== '0.12.0' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
-            throw new Error(`Native binding package version mismatch, expected 0.12.0 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
+          if (bindingPackageVersion !== '0.12.1' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
+            throw new Error(`Native binding package version mismatch, expected 0.12.1 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
           }
           return binding
         } catch (e) {
@@ -366,8 +366,8 @@ function requireNative() {
         try {
           const binding = require('@boundaryml/baml-core-node-linux-arm-gnueabihf')
           const bindingPackageVersion = require('@boundaryml/baml-core-node-linux-arm-gnueabihf/package.json').version
-          if (bindingPackageVersion !== '0.12.0' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
-            throw new Error(`Native binding package version mismatch, expected 0.12.0 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
+          if (bindingPackageVersion !== '0.12.1' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
+            throw new Error(`Native binding package version mismatch, expected 0.12.1 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
           }
           return binding
         } catch (e) {
@@ -384,8 +384,8 @@ function requireNative() {
         try {
           const binding = require('@boundaryml/baml-core-node-linux-loong64-musl')
           const bindingPackageVersion = require('@boundaryml/baml-core-node-linux-loong64-musl/package.json').version
-          if (bindingPackageVersion !== '0.12.0' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
-            throw new Error(`Native binding package version mismatch, expected 0.12.0 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
+          if (bindingPackageVersion !== '0.12.1' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
+            throw new Error(`Native binding package version mismatch, expected 0.12.1 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
           }
           return binding
         } catch (e) {
@@ -400,8 +400,8 @@ function requireNative() {
         try {
           const binding = require('@boundaryml/baml-core-node-linux-loong64-gnu')
           const bindingPackageVersion = require('@boundaryml/baml-core-node-linux-loong64-gnu/package.json').version
-          if (bindingPackageVersion !== '0.12.0' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
-            throw new Error(`Native binding package version mismatch, expected 0.12.0 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
+          if (bindingPackageVersion !== '0.12.1' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
+            throw new Error(`Native binding package version mismatch, expected 0.12.1 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
           }
           return binding
         } catch (e) {
@@ -418,8 +418,8 @@ function requireNative() {
         try {
           const binding = require('@boundaryml/baml-core-node-linux-riscv64-musl')
           const bindingPackageVersion = require('@boundaryml/baml-core-node-linux-riscv64-musl/package.json').version
-          if (bindingPackageVersion !== '0.12.0' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
-            throw new Error(`Native binding package version mismatch, expected 0.12.0 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
+          if (bindingPackageVersion !== '0.12.1' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
+            throw new Error(`Native binding package version mismatch, expected 0.12.1 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
           }
           return binding
         } catch (e) {
@@ -434,8 +434,8 @@ function requireNative() {
         try {
           const binding = require('@boundaryml/baml-core-node-linux-riscv64-gnu')
           const bindingPackageVersion = require('@boundaryml/baml-core-node-linux-riscv64-gnu/package.json').version
-          if (bindingPackageVersion !== '0.12.0' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
-            throw new Error(`Native binding package version mismatch, expected 0.12.0 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
+          if (bindingPackageVersion !== '0.12.1' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
+            throw new Error(`Native binding package version mismatch, expected 0.12.1 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
           }
           return binding
         } catch (e) {
@@ -451,8 +451,8 @@ function requireNative() {
       try {
         const binding = require('@boundaryml/baml-core-node-linux-ppc64-gnu')
         const bindingPackageVersion = require('@boundaryml/baml-core-node-linux-ppc64-gnu/package.json').version
-        if (bindingPackageVersion !== '0.12.0' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
-          throw new Error(`Native binding package version mismatch, expected 0.12.0 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
+        if (bindingPackageVersion !== '0.12.1' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
+          throw new Error(`Native binding package version mismatch, expected 0.12.1 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
         }
         return binding
       } catch (e) {
@@ -467,8 +467,8 @@ function requireNative() {
       try {
         const binding = require('@boundaryml/baml-core-node-linux-s390x-gnu')
         const bindingPackageVersion = require('@boundaryml/baml-core-node-linux-s390x-gnu/package.json').version
-        if (bindingPackageVersion !== '0.12.0' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
-          throw new Error(`Native binding package version mismatch, expected 0.12.0 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
+        if (bindingPackageVersion !== '0.12.1' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
+          throw new Error(`Native binding package version mismatch, expected 0.12.1 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
         }
         return binding
       } catch (e) {
@@ -487,8 +487,8 @@ function requireNative() {
       try {
         const binding = require('@boundaryml/baml-core-node-openharmony-arm64')
         const bindingPackageVersion = require('@boundaryml/baml-core-node-openharmony-arm64/package.json').version
-        if (bindingPackageVersion !== '0.12.0' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
-          throw new Error(`Native binding package version mismatch, expected 0.12.0 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
+        if (bindingPackageVersion !== '0.12.1' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
+          throw new Error(`Native binding package version mismatch, expected 0.12.1 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
         }
         return binding
       } catch (e) {
@@ -503,8 +503,8 @@ function requireNative() {
       try {
         const binding = require('@boundaryml/baml-core-node-openharmony-x64')
         const bindingPackageVersion = require('@boundaryml/baml-core-node-openharmony-x64/package.json').version
-        if (bindingPackageVersion !== '0.12.0' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
-          throw new Error(`Native binding package version mismatch, expected 0.12.0 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
+        if (bindingPackageVersion !== '0.12.1' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
+          throw new Error(`Native binding package version mismatch, expected 0.12.1 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
         }
         return binding
       } catch (e) {
@@ -519,8 +519,8 @@ function requireNative() {
       try {
         const binding = require('@boundaryml/baml-core-node-openharmony-arm')
         const bindingPackageVersion = require('@boundaryml/baml-core-node-openharmony-arm/package.json').version
-        if (bindingPackageVersion !== '0.12.0' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
-          throw new Error(`Native binding package version mismatch, expected 0.12.0 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
+        if (bindingPackageVersion !== '0.12.1' && process.env.NAPI_RS_ENFORCE_VERSION_CHECK && process.env.NAPI_RS_ENFORCE_VERSION_CHECK !== '0') {
+          throw new Error(`Native binding package version mismatch, expected 0.12.1 but got ${bindingPackageVersion}. You can reinstall dependencies to fix this issue.`)
         }
         return binding
       } catch (e) {
@@ -596,7 +596,7 @@ if (!nativeBinding) {
   throw new Error(`Failed to load native binding`)
 }
 
-const { BamlAudio, BamlCallContext, BamlHandle, BamlImage, BamlPdf, BamlRuntime, BamlVideo, Collector, FunctionLog, HostSpanManager, LlmCall, LLMCall, Timing, Usage, _seedFunctionRefHandle, _seedGenericMediaHandle, cancelFunctionCall, completeHostCall, flushEvents, getRuntime, getVersion, mintHostErrorKey, newFunctionCall, registerErrorReleaseCallback, registerHostCallable, releaseHostCallable } = nativeBinding
+const { BamlAudio, BamlCallContext, BamlHandle, BamlImage, BamlPdf, BamlRuntime, BamlVideo, Collector, FunctionLog, HostSpanManager, LlmCall, LLMCall, Timing, Usage, _seedFunctionRefHandle, _seedGenericMediaHandle, cancelFunctionCall, completeHostCall, flushEvents, getRuntime, getVersion, mintHostValueKey, newFunctionCall, registerHostCallable, registerHostValueReleaseCallback, releaseHostCallable } = nativeBinding
 export { BamlAudio }
 export { BamlCallContext }
 export { BamlHandle }
@@ -618,8 +618,8 @@ export { completeHostCall }
 export { flushEvents }
 export { getRuntime }
 export { getVersion }
-export { mintHostErrorKey }
+export { mintHostValueKey }
 export { newFunctionCall }
-export { registerErrorReleaseCallback }
 export { registerHostCallable }
+export { registerHostValueReleaseCallback }
 export { releaseHostCallable }
diff --git a/baml_language/sdks/nodejs/bridge_nodejs/dist/proto.js b/baml_language/sdks/nodejs/bridge_nodejs/dist/proto.js
index 2331fd01c0..b611b78750 100644
--- a/baml_language/sdks/nodejs/bridge_nodejs/dist/proto.js
+++ b/baml_language/sdks/nodejs/bridge_nodejs/dist/proto.js
@@ -14,7 +14,7 @@ import { baml_core } from './proto/baml_cffi.js';
 import { BamlHandle, BamlImage, BamlAudio, BamlVideo, BamlPdf, registerHostCallable, releaseHostCallable, completeHostCall, } from './native.js';
 import { BamlStream } from './stream.js';
 import { BamlAbortError, BamlCancelledError, BamlError, BamlPanic } from './errors.js';
-import { registerHostError, tryRehydrateFromHandle, } from './host_error_registry.js';
+import { registerHostOpaque, tryRehydrateHostValueByKey, } from './host_value_registry.js';
 import { getTypeMap } from './typemap.js';
 const CallFunctionArgs = baml_core.cffi.v1.CallFunctionArgs;
 const BamlOutboundValue = baml_core.cffi.v1.BamlOutboundValue;
@@ -479,7 +479,7 @@ export function decodeCallResult(data) {
             const { value, className, message } = decodeThrown(result.error?.value);
             const trace = result.error?.trace ?? [];
             // Same-host rehydration: a `baml.errors.HostCallable` carrying a
-            // `_handle` that still resolves in this process's host-error
+            // `_handle` that still resolves in this process's host-value
             // registry re-throws the *original* JS error object the bridge
             // registered on the inbound throw — preserving `raised === caught`
             // identity. Foreign runtimes (a different Node process, the
@@ -487,7 +487,7 @@ export function decodeCallResult(data) {
             // metadata-bearing `BamlError(HostCallable)` wrapper below.
             if (className === 'baml.errors.HostCallable' && value !== null && typeof value === 'object') {
                 const handle = value._handle;
-                const original = tryRehydrateFromHandle(handle);
+                const original = tryRehydrateHostValueByKey(handle);
                 if (original !== undefined) {
                     throw original;
                 }
@@ -641,7 +641,7 @@ function buildHostCallableInbound(className, message, traceback, handleKey) {
         value: InboundValue.create({
             handle: {
                 key: handleKey,
-                handleType: BamlHandleType.HOST_VALUE_ERROR,
+                handleType: BamlHandleType.HOST_VALUE_OPAQUE,
             },
         }),
     });
@@ -663,7 +663,7 @@ function buildHostCallableInbound(className, message, traceback, handleKey) {
 }
 // Sentinel `_handle` key used by paths that have *no* JS error object to
 // register (the `completeHostCallLastResort` fallback below). Real host
-// throws register the JS error via `registerHostError` and emit its
+// throws register the JS error via `registerHostOpaque` and emit its
 // minted key; engine-internal synthetic faults use this sentinel. The
 // engine's structural check accepts either; same-host decoders that look
 // up `{low:0,high:0}` find nothing and fall through to the
@@ -742,14 +742,14 @@ function sendHostCallableError(callId, err) {
         // throw when given a hostile input (e.g. a Proxy whose `constructor`,
         // `name`, or `message` getters throw — see the
         // `host-callable always completes on abnormal paths` jest suite).
-        // In that case `registerHostError` is never reached, control jumps
+        // In that case `registerHostOpaque` is never reached, control jumps
         // to the outer `catch (innerErr)` → `completeHostCallLastResort`,
         // and the user sees a metadata-only `HostCallable` instead of the
         // original Proxy. Identity loss here is the right trade — the
         // alternative is hanging the call.
         //
         // Registration-leak edge case (rare, bounded): if encoding succeeds
-        // through `registerHostError` but `buildHostCallableInbound` or
+        // through `registerHostOpaque` but `buildHostCallableInbound` or
         // `InboundValue.encode` fails after, the TS map entry stays alive
         // with no corresponding engine-side `HostValueArc` to release it,
         // so it lives until process exit. Both downstream calls are deeply
@@ -757,7 +757,7 @@ function sendHostCallableError(callId, err) {
         // and don't depend on `err`'s shape, so this is effectively
         // unreachable outside protobufjs / native-binding corruption.
         const { className, message, stack } = describeError(err);
-        const handleKey = registerHostError(err);
+        const handleKey = registerHostOpaque(err);
         const inbound = buildHostCallableInbound(className, message, stack, handleKey);
         const bytes = Buffer.from(InboundValue.encode(inbound).finish());
         completeHostCall(callId, 1, bytes);
diff --git a/baml_language/sdks/nodejs/bridge_nodejs/dist/proto.js.map b/baml_language/sdks/nodejs/bridge_nodejs/dist/proto.js.map
index 3f2d17c383..cc5cdb8441 100644
--- a/baml_language/sdks/nodejs/bridge_nodejs/dist/proto.js.map
+++ b/baml_language/sdks/nodejs/bridge_nodejs/dist/proto.js.map
@@ -1 +1 @@
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\ No newline at end of file
diff --git a/baml_language/sdks/nodejs/bridge_nodejs/dist/proto/baml_cffi.d.ts b/baml_language/sdks/nodejs/bridge_nodejs/dist/proto/baml_cffi.d.ts
index 771478719c..c37f5ce1b8 100644
--- a/baml_language/sdks/nodejs/bridge_nodejs/dist/proto/baml_cffi.d.ts
+++ b/baml_language/sdks/nodejs/bridge_nodejs/dist/proto/baml_cffi.d.ts
@@ -32,7 +32,7 @@ export namespace baml_core {
                 ADT_TYPE = 13,
                 ADT_TAGGED_HEAP_HANDLE = 14,
                 HOST_VALUE_CALLABLE = 15,
-                HOST_VALUE_ERROR = 16
+                HOST_VALUE_OPAQUE = 16
             }
 
             /** Properties of a BamlHandle. */
diff --git a/baml_language/sdks/nodejs/bridge_nodejs/dist/proto/baml_cffi.js b/baml_language/sdks/nodejs/bridge_nodejs/dist/proto/baml_cffi.js
index 9f320f518d..251fe7a02e 100644
--- a/baml_language/sdks/nodejs/bridge_nodejs/dist/proto/baml_cffi.js
+++ b/baml_language/sdks/nodejs/bridge_nodejs/dist/proto/baml_cffi.js
@@ -59,7 +59,7 @@ export const baml_core = $root.baml_core = (() => {
              * @property {number} ADT_TYPE=13 ADT_TYPE value
              * @property {number} ADT_TAGGED_HEAP_HANDLE=14 ADT_TAGGED_HEAP_HANDLE value
              * @property {number} HOST_VALUE_CALLABLE=15 HOST_VALUE_CALLABLE value
-             * @property {number} HOST_VALUE_ERROR=16 HOST_VALUE_ERROR value
+             * @property {number} HOST_VALUE_OPAQUE=16 HOST_VALUE_OPAQUE value
              */
             v1.BamlHandleType = (function() {
                 const valuesById = {}, values = Object.create(valuesById);
@@ -77,7 +77,7 @@ export const baml_core = $root.baml_core = (() => {
                 values[valuesById[13] = "ADT_TYPE"] = 13;
                 values[valuesById[14] = "ADT_TAGGED_HEAP_HANDLE"] = 14;
                 values[valuesById[15] = "HOST_VALUE_CALLABLE"] = 15;
-                values[valuesById[16] = "HOST_VALUE_ERROR"] = 16;
+                values[valuesById[16] = "HOST_VALUE_OPAQUE"] = 16;
                 return values;
             })();
 
@@ -358,7 +358,7 @@ export const baml_core = $root.baml_core = (() => {
                     case 15:
                         message.handleType = 15;
                         break;
-                    case "HOST_VALUE_ERROR":
+                    case "HOST_VALUE_OPAQUE":
                     case 16:
                         message.handleType = 16;
                         break;
@@ -4923,7 +4923,7 @@ export const baml_core = $root.baml_core = (() => {
                     case 15:
                         message.handleType = 15;
                         break;
-                    case "HOST_VALUE_ERROR":
+                    case "HOST_VALUE_OPAQUE":
                     case 16:
                         message.handleType = 16;
                         break;
diff --git a/baml_language/sdks/nodejs/bridge_nodejs/src/host_value.rs b/baml_language/sdks/nodejs/bridge_nodejs/src/host_value.rs
index 8db7fd7891..002b932b04 100644
--- a/baml_language/sdks/nodejs/bridge_nodejs/src/host_value.rs
+++ b/baml_language/sdks/nodejs/bridge_nodejs/src/host_value.rs
@@ -187,18 +187,18 @@ fn drop_registry_entry(host_value_key: u64) {
     drop(popped);
 }
 
-/// Drop the JS dispatch wrapper / error-map entry associated with
+/// Drop the JS dispatch wrapper / host-value-map entry associated with
 /// `host_value_key`.
 ///
 /// Fires when the last Rust clone of the corresponding `HostValueArc` is
 /// dropped — see `bex_external_types::host_value::host_release_dispatch`.
-/// We don't track *which* kind (callable vs error) the key referred to:
+/// We don't track *which* kind (callable vs opaque) the key referred to:
 /// every release attempts both the Rust-side callable drop and the
-/// TS-side error-map delete. Whichever one of the two registries actually
+/// TS-side host-value-map delete. Whichever one of the two registries actually
 /// held the entry cleans it up; the other is a benign no-op.
 pub extern "C" fn host_release_callback(host_value_key: u64) {
     drop_registry_entry(host_value_key);
-    if let Some(tsfn) = ERROR_RELEASE_CALLBACK.get() {
+    if let Some(tsfn) = HOST_VALUE_RELEASE_CALLBACK.get() {
         // Fire-and-forget: the TS callback removes the map entry on the
         // libuv loop. `QueueFull` would mean an enormous backlog of
         // releases — log it (so it's visible in stress tests) and move
@@ -210,7 +210,7 @@ pub extern "C" fn host_release_callback(host_value_key: u64) {
         );
         if status != Status::Ok {
             log::warn!(
-                "host_release_callback: error-release tsfn returned {status:?} \
+                "host_release_callback: host-value-release tsfn returned {status:?} \
                  for key {host_value_key}; TS-side map entry will leak until next GC",
             );
         }
@@ -218,52 +218,59 @@ pub extern "C" fn host_release_callback(host_value_key: u64) {
 }
 
 // ============================================================================
-// Host-error registry — JS-side storage with Rust-driven release
+// Host-value registry — JS-side storage with Rust-driven release
 // ============================================================================
 //
-// A native JS exception raised inside a user callback round-trips back to
-// the same Node process as the *same* `Error` object (mirrors the Python
-// bridge's `register_host_error` / `lookup_host_value` pair). The TS bridge
-// owns the storage (a `Map<bigint, unknown>` of JS error values) because
-// napi-rs has no zero-overhead persistent reference type for arbitrary JS
-// values; Rust owns the key minting (so callable + error keys share a
-// single globally-unique counter and never collide) and the release
+// An arbitrary host JS value (e.g. a native exception raised inside a user
+// callback) round-trips back to the same Node process as the *same* object
+// (mirrors the Python bridge's `register_host_opaque` / `lookup_host_value`
+// pair). The TS bridge owns the storage (a `Map<bigint, unknown>` of JS
+// values) because napi-rs has no zero-overhead persistent reference type for
+// arbitrary JS values; Rust owns the key minting (so callable + opaque keys
+// share a single globally-unique counter and never collide) and the release
 // signal (the engine's `host_release_dispatch::fire(key)` fires Rust's
 // `host_release_callback`, which notifies TS to remove its map entry).
 //
 // Release is a fire-and-forget tsfn call on the libuv loop — TS removes the
 // entry once napi schedules the callback. A lookup that races a release
 // returns the (about-to-be-released) reference, which only delays GC of
-// that exception by one tick; no correctness issue. The TS map never
-// silently leaks: every key minted via `mint_host_error_key` corresponds
+// that value by one tick; no correctness issue. The TS map never
+// silently leaks: every key minted via `mint_host_value_key` corresponds
 // to an `Arc<HostValueArc>` on the engine side whose `Drop` is guaranteed
 // to fire the release callback.
 
 /// Threadsafe handle to the TS-installed release callback. Set once at
-/// module load via [`register_error_release_callback`].
-type ErrorReleaseTsfn =
-    ThreadsafeFunction<HandleKey, (), HandleKey, Status, false, true, ERROR_RELEASE_QUEUE_SIZE>;
+/// module load via [`register_host_value_release_callback`].
+type HostValueReleaseTsfn = ThreadsafeFunction<
+    HandleKey,
+    (),
+    HandleKey,
+    Status,
+    false,
+    true,
+    HOST_VALUE_RELEASE_QUEUE_SIZE,
+>;
 
-/// Upper bound on queued, not-yet-delivered error-release notifications.
+/// Upper bound on queued, not-yet-delivered host-value-release notifications.
 /// Generous because each notification is tiny (one `HandleKey`) and bursts
 /// can happen during engine GC sweeps. `Status::QueueFull` from
 /// `tsfn.call` is logged but not otherwise surfaced — the TS map entry
 /// stays until the process exits, but the engine's `HostValueArc` has
 /// already dropped so there's no further engine state to clean up.
-const ERROR_RELEASE_QUEUE_SIZE: usize = 4096;
+const HOST_VALUE_RELEASE_QUEUE_SIZE: usize = 4096;
 
-static ERROR_RELEASE_CALLBACK: OnceLock<Arc<ErrorReleaseTsfn>> = OnceLock::new();
+static HOST_VALUE_RELEASE_CALLBACK: OnceLock<Arc<HostValueReleaseTsfn>> = OnceLock::new();
 
-/// Mint a fresh host-value key, drawing from the shared callable+error
+/// Mint a fresh host-value key, drawing from the shared callable+opaque
 /// counter so the engine sees one globally-unique keyspace. Returned to
-/// TS by `registerHostError` (the TS-side function in
-/// `host_error_registry.ts`).
+/// TS by `registerHostOpaque` (the TS-side function in
+/// `host_value_registry.ts`).
 ///
-/// Exposed to JS as `mintHostErrorKey() -> HandleKey`. The TS-side error
-/// registry calls this once per `registerHostError(err)` before inserting
-/// the error into its `Map<bigint, unknown>`.
-#[napi(js_name = "mintHostErrorKey")]
-pub fn mint_host_error_key() -> HandleKey {
+/// Exposed to JS as `mintHostValueKey() -> HandleKey`. The TS-side host-value
+/// registry calls this once per `registerHostOpaque(value)` before inserting
+/// the value into its `Map<bigint, unknown>`.
+#[napi(js_name = "mintHostValueKey")]
+pub fn mint_host_value_key() -> HandleKey {
     HandleKey::from_u64(next_key())
 }
 
@@ -289,19 +296,21 @@ pub fn mint_host_error_key() -> HandleKey {
 /// host callback awaiting completion *must* keep the loop alive so the
 /// JS callback can actually run.
 ///
-/// Exposed to JS as `registerErrorReleaseCallback(cb)`. Must be called
+/// Exposed to JS as `registerHostValueReleaseCallback(cb)`. Must be called
 /// exactly once at SDK module init, before any host call is dispatched.
 #[napi(ts_args_type = "callback: (key: HandleKey) => void")]
-pub fn register_error_release_callback(callback: Function<'_, HandleKey, ()>) -> napi::Result<()> {
-    let tsfn: ErrorReleaseTsfn = callback
+pub fn register_host_value_release_callback(
+    callback: Function<'_, HandleKey, ()>,
+) -> napi::Result<()> {
+    let tsfn: HostValueReleaseTsfn = callback
         .build_threadsafe_function()
         .callee_handled::<false>()
         .weak::<true>()
-        .max_queue_size::<ERROR_RELEASE_QUEUE_SIZE>()
+        .max_queue_size::<HOST_VALUE_RELEASE_QUEUE_SIZE>()
         .build()?;
     // First-call-wins; ignore the `Err(_)` from `set` on later calls
     // (caller is responsible for not re-registering).
-    let _ = ERROR_RELEASE_CALLBACK.set(Arc::new(tsfn));
+    let _ = HOST_VALUE_RELEASE_CALLBACK.set(Arc::new(tsfn));
     Ok(())
 }
 
diff --git a/baml_language/sdks/nodejs/bridge_nodejs/tests/host_callable.test.ts b/baml_language/sdks/nodejs/bridge_nodejs/tests/host_callable.test.ts
index 9eedc57429..8f9ee2e489 100644
--- a/baml_language/sdks/nodejs/bridge_nodejs/tests/host_callable.test.ts
+++ b/baml_language/sdks/nodejs/bridge_nodejs/tests/host_callable.test.ts
@@ -30,7 +30,7 @@ import { vi } from 'vitest';
 import { BamlRuntime } from '../dist/native.js';
 import { callFunction, callFunctionSync } from '../dist/index.js';
 import { encodeCallArgs } from '../dist/proto.js';
-import * as hostErrorRegistry from '../dist/host_error_registry.js';
+import * as hostValueRegistry from '../dist/host_value_registry.js';
 
 const CALLBACK_BAML = `
 function CallCb(callback: (int) -> string, x: int) -> string {
@@ -119,12 +119,12 @@ describe('host-callable error surfacing', () => {
         // Instance with the handle in `_handle`; the outbound decoder looks
         // the handle up and re-throws the original.
         //
-        // The spy on `tryRehydrateFromHandle` is defense-in-depth: identity
+        // The spy on `tryRehydrateHostValueByKey` is defense-in-depth: identity
         // (`===`) alone could in principle be satisfied by a future fast-path
         // that bypasses the registry (e.g. a closure-captured shortcut).
         // The spy pins the actual flow — proto.ts's outbound decoder MUST
-        // consult the host-error registry on every host-callable throw.
-        const spy = vi.spyOn(hostErrorRegistry, 'tryRehydrateFromHandle');
+        // consult the host-value registry on every host-callable throw.
+        const spy = vi.spyOn(hostValueRegistry, 'tryRehydrateHostValueByKey');
         try {
             const rt = makeRuntime();
             const raised = new Error('identity-check');
diff --git a/baml_language/sdks/nodejs/bridge_nodejs/typescript_src/host_error_registry.ts b/baml_language/sdks/nodejs/bridge_nodejs/typescript_src/host_value_registry.ts
similarity index 61%
rename from baml_language/sdks/nodejs/bridge_nodejs/typescript_src/host_error_registry.ts
rename to baml_language/sdks/nodejs/bridge_nodejs/typescript_src/host_value_registry.ts
index 1957a327f3..6cdb43a80e 100644
--- a/baml_language/sdks/nodejs/bridge_nodejs/typescript_src/host_error_registry.ts
+++ b/baml_language/sdks/nodejs/bridge_nodejs/typescript_src/host_value_registry.ts
@@ -1,44 +1,46 @@
-// host_error_registry.ts — mirrors bridge_python's `register_host_error`
+// host_value_registry.ts — mirrors bridge_python's `register_host_opaque`
 // + `lookup_host_value` pair.
 //
-// A native JS exception raised inside a user callable round-trips back to
-// the *same* Node process as the *same* `Error` object (`raised === caught`
-// identity), not flattened into a metadata-only `BamlError(HostCallable(...))`
-// wrapper. The plumbing:
+// An arbitrary host JS value round-trips back to the *same* Node process as
+// the *same* object (identity preserved), not flattened into a metadata-only
+// wrapper. A native JS exception raised inside a user callable is the primary
+// consumer: it round-trips as the *same* `Error` object (`raised === caught`
+// identity), not a metadata-only `BamlError(HostCallable(...))` wrapper. The
+// plumbing:
 //
 //   1. The TS bridge catches the JS error inside `sendHostCallableError`
-//      (proto.ts) and calls `registerHostError(err)` here.
-//   2. `registerHostError` mints a globally-unique key via
-//      `native.mintHostErrorKey` (drawing from the shared callable+error
+//      (proto.ts) and calls `registerHostOpaque(err)` here.
+//   2. `registerHostOpaque` mints a globally-unique key via
+//      `native.mintHostValueKey` (drawing from the shared callable+opaque
 //      counter on the Rust side so the engine sees one keyspace), stores
-//      the JS error in the local `Map<bigint, unknown>`, returns the key.
+//      the JS value in the local `Map<bigint, unknown>`, returns the key.
 //   3. The bridge emits an `InboundValue.Class(name="baml.errors.HostCallable",
-//      fields=[..., _handle: Handle(HOST_VALUE_ERROR, key)])`. The engine
+//      fields=[..., _handle: Handle(HOST_VALUE_OPAQUE, key)])`. The engine
 //      interns an `Arc<HostValueArc>` per the same key.
 //   4. When BAML propagates the throw back out to the host, the outbound
-//      encoder re-emits the `_handle: Handle(HOST_VALUE_ERROR, key)`. The
+//      encoder re-emits the `_handle: Handle(HOST_VALUE_OPAQUE, key)`. The
 //      TS decoder (proto.ts) inspects a decoded `HostCallable` instance,
-//      reads `_handle.key`, calls `lookupHostError(key)` here, and re-throws
+//      reads `_handle.key`, calls `lookupHostValue(key)` here, and re-throws
 //      the original JS error.
 //   5. When the engine drops its last `Arc<HostValueArc>(key)`, the Rust
 //      `host_release_callback` fires the TS-installed release callback
-//      (`native.registerErrorReleaseCallback`), which calls `_releaseHostError`
+//      (`native.registerHostValueReleaseCallback`), which calls `_releaseHostValue`
 //      here to remove the map entry.
 //
 // Foreign runtimes (a different Node process, the Python bridge, etc.) see
 // a `_handle` whose key doesn't resolve in their local registry; the
 // decoder falls back to the metadata-bearing `BamlError(HostCallable(...))`
 // wrapper. The reserved `0` is used as a sentinel by code paths that
-// cannot register a real JS error (engine-internal synthetic faults like
-// "no JS callable for this key"); `_releaseHostError(0n)` is a benign
-// no-op since `mintHostErrorKey` never returns `0`.
+// cannot register a real JS value (engine-internal synthetic faults like
+// "no JS callable for this key"); `_releaseHostValue(0n)` is a benign
+// no-op since `mintHostValueKey` never returns `0`.
 
-import { mintHostErrorKey, registerErrorReleaseCallback, BamlHandle, type HandleKey } from './native.js';
+import { mintHostValueKey, registerHostValueReleaseCallback, BamlHandle, type HandleKey } from './native.js';
 import { baml_core } from './proto/baml_cffi.js';
 
 const BamlHandleType = baml_core.cffi.v1.BamlHandleType;
 
-const errorMap = new Map<bigint, unknown>();
+const hostValueMap = new Map<bigint, unknown>();
 
 /**
  * Convert a `HandleKey` (`{ low, high }`) to a `bigint` for use as a `Map` key.
@@ -62,12 +64,12 @@ function handleKeyToBigint(key: HandleKey): bigint {
 }
 
 /**
- * Register a JS error object and return its native `HandleKey` for the
- * `_handle: Handle(HOST_VALUE_ERROR, key)` slot of a
- * `baml.errors.HostCallable` Instance. Mints a fresh key via the Rust
- * side's shared counter (guaranteed non-zero — Rust `next_key` skips
- * `0`); stores the error keyed by the same key (recomposed as a
- * `bigint` for `Map`-key equality).
+ * Register an arbitrary host JS value and return its native `HandleKey` for
+ * the `_handle: Handle(HOST_VALUE_OPAQUE, key)` slot of a
+ * `baml.errors.HostCallable` Instance (or any future opaque-value carrier).
+ * Mints a fresh key via the Rust side's shared counter (guaranteed non-zero —
+ * Rust `next_key` skips `0`); stores the value keyed by the same key
+ * (recomposed as a `bigint` for `Map`-key equality).
  *
  * Returns the native `HandleKey` directly so it can flow into the
  * protobufjs encoder without an intermediate `bigint→Long` conversion
@@ -75,17 +77,17 @@ function handleKeyToBigint(key: HandleKey): bigint {
  * the native `HandleKey` already provides; a bare `bigint` does not
  * encode correctly through the `IInboundValue.handle.key` field).
  */
-export function registerHostError(err: unknown): HandleKey {
-    const key = mintHostErrorKey();
-    errorMap.set(handleKeyToBigint(key), err);
+export function registerHostOpaque(value: unknown): HandleKey {
+    const key = mintHostValueKey();
+    hostValueMap.set(handleKeyToBigint(key), value);
     return key;
 }
 
 /**
- * Look up a host-registered JS error by key. Returns `undefined` when:
- * - the key is the reserved sentinel `0n` (no real error was registered);
+ * Look up a host-registered JS value by key. Returns `undefined` when:
+ * - the key is the reserved sentinel `0n` (no real value was registered);
  * - the engine has already released the entry (last `HostValueArc` clone
- *   dropped → Rust `host_release_callback` fired → `_releaseHostError`
+ *   dropped → Rust `host_release_callback` fired → `_releaseHostValue`
  *   removed the entry);
  * - the key was minted by a different Node process (cross-runtime handle).
  *
@@ -97,18 +99,18 @@ export function registerHostError(err: unknown): HandleKey {
  * emitting an outbound proto referencing its key — the outbound encode
  * holds a strong handle through proto serialization, and the release tsfn
  * isn't fired until that strong handle drops. By the time the TS decoder
- * runs `tryRehydrateFromHandle`, the only way the map entry is gone is if
+ * runs `tryRehydrateHostValueByKey`, the only way the map entry is gone is if
  * a *prior* outbound completed and the engine has since dropped its last
  * Arc; in that case the user has already observed the original throw at
  * least once, so a second lookup-miss → metadata-fallback is acceptable.
  */
-export function lookupHostError(key: bigint): unknown {
-    return errorMap.get(key);
+export function lookupHostValue(key: bigint): unknown {
+    return hostValueMap.get(key);
 }
 
 /**
  * Convenience for the outbound decoder: if `handle` is a `BamlHandle`
- * tagged `HOST_VALUE_ERROR`, look up the originating JS error object in
+ * tagged `HOST_VALUE_OPAQUE`, look up the originating JS value in
  * the registry and return it. Returns `undefined` for any other handle
  * type, a non-`BamlHandle` argument, or a key that doesn't resolve.
  *
@@ -116,23 +118,23 @@ export function lookupHostError(key: bigint): unknown {
  * exception when a BAML-thrown `baml.errors.HostCallable` propagates back
  * to the same Node process that originated it.
  */
-export function tryRehydrateFromHandle(handle: unknown): unknown {
+export function tryRehydrateHostValueByKey(handle: unknown): unknown {
     if (!(handle instanceof BamlHandle)) return undefined;
-    if (handle.handleType !== BamlHandleType.HOST_VALUE_ERROR) return undefined;
-    return lookupHostError(handleKeyToBigint(handle.key));
+    if (handle.handleType !== BamlHandleType.HOST_VALUE_OPAQUE) return undefined;
+    return lookupHostValue(handleKeyToBigint(handle.key));
 }
 
 /**
  * Internal: remove the map entry for `key`. Wired at module init as the
  * Rust-side release callback. Idempotent and absent-key-safe so the same
  * callback can be invoked for *every* `HostValueArc` release (including
- * callable keys, which never have a TS-side error entry).
+ * callable keys, which never have a TS-side host-value entry).
  */
-function _releaseHostError(key: HandleKey): void {
-    errorMap.delete(handleKeyToBigint(key));
+function _releaseHostValue(key: HandleKey): void {
+    hostValueMap.delete(handleKeyToBigint(key));
 }
 
 // Install the Rust-side release callback exactly once at module load. The
 // napi function is itself first-call-wins on the Rust side, so reloads
 // (e.g. test harnesses) are harmless.
-registerErrorReleaseCallback(_releaseHostError);
+registerHostValueReleaseCallback(_releaseHostValue);
diff --git a/baml_language/sdks/nodejs/bridge_nodejs/typescript_src/native.d.ts b/baml_language/sdks/nodejs/bridge_nodejs/typescript_src/native.d.ts
index 35fb4ce422..2fea8f16c7 100644
--- a/baml_language/sdks/nodejs/bridge_nodejs/typescript_src/native.d.ts
+++ b/baml_language/sdks/nodejs/bridge_nodejs/typescript_src/native.d.ts
@@ -235,19 +235,33 @@ export interface HandleKey {
 }
 
 /**
- * Mint a fresh host-value key, drawing from the shared callable+error
+ * Mint a fresh host-value key, drawing from the shared callable+opaque
  * counter so the engine sees one globally-unique keyspace. Returned to
- * TS by `registerHostError` (the TS-side function in
- * `host_error_registry.ts`).
+ * TS by `registerHostOpaque` (the TS-side function in
+ * `host_value_registry.ts`).
  *
- * Exposed to JS as `mintHostErrorKey() -> HandleKey`. The TS-side error
- * registry calls this once per `registerHostError(err)` before inserting
- * the error into its `Map<bigint, unknown>`.
+ * Exposed to JS as `mintHostValueKey() -> HandleKey`. The TS-side host-value
+ * registry calls this once per `registerHostOpaque(value)` before inserting
+ * the value into its `Map<bigint, unknown>`.
  */
-export declare function mintHostErrorKey(): HandleKey
+export declare function mintHostValueKey(): HandleKey
 
 export declare function newFunctionCall(): string
 
+/**
+ * Register a JS dispatch wrapper in the host-value table and return its key.
+ *
+ * Exposed to JS as `registerHostCallable(fn) -> HandleKey`. Called from
+ * the inbound encoder in `typescript_src/proto.ts` whenever a JS callable
+ * appears as a kwarg — the encoder constructs the dispatch wrapper around
+ * the user's function before calling this.
+ *
+ * The `Function` is converted into a `ThreadsafeFunction` so it can outlive
+ * the napi call scope and be invoked from any thread (the engine's tokio
+ * runtime calls into this entry point from a worker thread).
+ */
+export declare function registerHostCallable(callable: (callId: number, argsBytes: Buffer) => void): HandleKey
+
 /**
  * Install the TS-side release callback. First-call-wins; subsequent
  * calls are a no-op (matching the bridge_cffi dispatch-registration
@@ -271,24 +285,10 @@ export declare function newFunctionCall(): string
  * host callback awaiting completion *must* keep the loop alive so the
  * JS callback can actually run.
  *
- * Exposed to JS as `registerErrorReleaseCallback(cb)`. Must be called
+ * Exposed to JS as `registerHostValueReleaseCallback(cb)`. Must be called
  * exactly once at SDK module init, before any host call is dispatched.
  */
-export declare function registerErrorReleaseCallback(callback: (key: HandleKey) => void): void
-
-/**
- * Register a JS dispatch wrapper in the host-value table and return its key.
- *
- * Exposed to JS as `registerHostCallable(fn) -> HandleKey`. Called from
- * the inbound encoder in `typescript_src/proto.ts` whenever a JS callable
- * appears as a kwarg — the encoder constructs the dispatch wrapper around
- * the user's function before calling this.
- *
- * The `Function` is converted into a `ThreadsafeFunction` so it can outlive
- * the napi call scope and be invoked from any thread (the engine's tokio
- * runtime calls into this entry point from a worker thread).
- */
-export declare function registerHostCallable(callable: (callId: number, argsBytes: Buffer) => void): HandleKey
+export declare function registerHostValueReleaseCallback(callback: (key: HandleKey) => void): void
 
 /**
  * Release a host callable the inbound encoder registered but never handed to
diff --git a/baml_language/sdks/nodejs/bridge_nodejs/typescript_src/proto.ts b/baml_language/sdks/nodejs/bridge_nodejs/typescript_src/proto.ts
index cd605aa37d..3a2b14da03 100644
--- a/baml_language/sdks/nodejs/bridge_nodejs/typescript_src/proto.ts
+++ b/baml_language/sdks/nodejs/bridge_nodejs/typescript_src/proto.ts
@@ -19,9 +19,9 @@ import {
 import { BamlStream } from './stream.js';
 import { BamlAbortError, BamlCancelledError, BamlError, BamlPanic } from './errors.js';
 import {
-    registerHostError,
-    tryRehydrateFromHandle,
-} from './host_error_registry.js';
+    registerHostOpaque,
+    tryRehydrateHostValueByKey,
+} from './host_value_registry.js';
 import { BamlTypeMap, getTypeMap } from './typemap.js';
 
 const CallFunctionArgs = baml_core.cffi.v1.CallFunctionArgs;
@@ -516,7 +516,7 @@ export function decodeCallResult(data: Buffer | Uint8Array): unknown {
             const { value, className, message } = decodeThrown(result.error?.value);
             const trace = result.error?.trace ?? [];
             // Same-host rehydration: a `baml.errors.HostCallable` carrying a
-            // `_handle` that still resolves in this process's host-error
+            // `_handle` that still resolves in this process's host-value
             // registry re-throws the *original* JS error object the bridge
             // registered on the inbound throw — preserving `raised === caught`
             // identity. Foreign runtimes (a different Node process, the
@@ -524,7 +524,7 @@ export function decodeCallResult(data: Buffer | Uint8Array): unknown {
             // metadata-bearing `BamlError(HostCallable)` wrapper below.
             if (className === 'baml.errors.HostCallable' && value !== null && typeof value === 'object') {
                 const handle = (value as Record<string, unknown>)._handle;
-                const original = tryRehydrateFromHandle(handle);
+                const original = tryRehydrateHostValueByKey(handle);
                 if (original !== undefined) {
                     throw original;
                 }
@@ -696,7 +696,7 @@ function buildHostCallableInbound(
         value: InboundValue.create({
             handle: {
                 key: handleKey,
-                handleType: BamlHandleType.HOST_VALUE_ERROR,
+                handleType: BamlHandleType.HOST_VALUE_OPAQUE,
             },
         }),
     });
@@ -719,7 +719,7 @@ function buildHostCallableInbound(
 
 // Sentinel `_handle` key used by paths that have *no* JS error object to
 // register (the `completeHostCallLastResort` fallback below). Real host
-// throws register the JS error via `registerHostError` and emit its
+// throws register the JS error via `registerHostOpaque` and emit its
 // minted key; engine-internal synthetic faults use this sentinel. The
 // engine's structural check accepts either; same-host decoders that look
 // up `{low:0,high:0}` find nothing and fall through to the
@@ -798,14 +798,14 @@ function sendHostCallableError(callId: number, err: unknown): void {
         // throw when given a hostile input (e.g. a Proxy whose `constructor`,
         // `name`, or `message` getters throw — see the
         // `host-callable always completes on abnormal paths` jest suite).
-        // In that case `registerHostError` is never reached, control jumps
+        // In that case `registerHostOpaque` is never reached, control jumps
         // to the outer `catch (innerErr)` → `completeHostCallLastResort`,
         // and the user sees a metadata-only `HostCallable` instead of the
         // original Proxy. Identity loss here is the right trade — the
         // alternative is hanging the call.
         //
         // Registration-leak edge case (rare, bounded): if encoding succeeds
-        // through `registerHostError` but `buildHostCallableInbound` or
+        // through `registerHostOpaque` but `buildHostCallableInbound` or
         // `InboundValue.encode` fails after, the TS map entry stays alive
         // with no corresponding engine-side `HostValueArc` to release it,
         // so it lives until process exit. Both downstream calls are deeply
@@ -813,7 +813,7 @@ function sendHostCallableError(callId: number, err: unknown): void {
         // and don't depend on `err`'s shape, so this is effectively
         // unreachable outside protobufjs / native-binding corruption.
         const { className, message, stack } = describeError(err);
-        const handleKey = registerHostError(err);
+        const handleKey = registerHostOpaque(err);
         const inbound = buildHostCallableInbound(className, message, stack, handleKey);
         const bytes = Buffer.from(InboundValue.encode(inbound).finish());
         completeHostCall(callId, 1, bytes);
diff --git a/baml_language/sdks/nodejs/bridge_nodejs/typescript_src/proto/baml_cffi.d.ts b/baml_language/sdks/nodejs/bridge_nodejs/typescript_src/proto/baml_cffi.d.ts
index 771478719c..c37f5ce1b8 100644
--- a/baml_language/sdks/nodejs/bridge_nodejs/typescript_src/proto/baml_cffi.d.ts
+++ b/baml_language/sdks/nodejs/bridge_nodejs/typescript_src/proto/baml_cffi.d.ts
@@ -32,7 +32,7 @@ export namespace baml_core {
                 ADT_TYPE = 13,
                 ADT_TAGGED_HEAP_HANDLE = 14,
                 HOST_VALUE_CALLABLE = 15,
-                HOST_VALUE_ERROR = 16
+                HOST_VALUE_OPAQUE = 16
             }
 
             /** Properties of a BamlHandle. */
diff --git a/baml_language/sdks/nodejs/bridge_nodejs/typescript_src/proto/baml_cffi.js b/baml_language/sdks/nodejs/bridge_nodejs/typescript_src/proto/baml_cffi.js
index 9f320f518d..251fe7a02e 100644
--- a/baml_language/sdks/nodejs/bridge_nodejs/typescript_src/proto/baml_cffi.js
+++ b/baml_language/sdks/nodejs/bridge_nodejs/typescript_src/proto/baml_cffi.js
@@ -59,7 +59,7 @@ export const baml_core = $root.baml_core = (() => {
              * @property {number} ADT_TYPE=13 ADT_TYPE value
              * @property {number} ADT_TAGGED_HEAP_HANDLE=14 ADT_TAGGED_HEAP_HANDLE value
              * @property {number} HOST_VALUE_CALLABLE=15 HOST_VALUE_CALLABLE value
-             * @property {number} HOST_VALUE_ERROR=16 HOST_VALUE_ERROR value
+             * @property {number} HOST_VALUE_OPAQUE=16 HOST_VALUE_OPAQUE value
              */
             v1.BamlHandleType = (function() {
                 const valuesById = {}, values = Object.create(valuesById);
@@ -77,7 +77,7 @@ export const baml_core = $root.baml_core = (() => {
                 values[valuesById[13] = "ADT_TYPE"] = 13;
                 values[valuesById[14] = "ADT_TAGGED_HEAP_HANDLE"] = 14;
                 values[valuesById[15] = "HOST_VALUE_CALLABLE"] = 15;
-                values[valuesById[16] = "HOST_VALUE_ERROR"] = 16;
+                values[valuesById[16] = "HOST_VALUE_OPAQUE"] = 16;
                 return values;
             })();
 
@@ -358,7 +358,7 @@ export const baml_core = $root.baml_core = (() => {
                     case 15:
                         message.handleType = 15;
                         break;
-                    case "HOST_VALUE_ERROR":
+                    case "HOST_VALUE_OPAQUE":
                     case 16:
                         message.handleType = 16;
                         break;
@@ -4923,7 +4923,7 @@ export const baml_core = $root.baml_core = (() => {
                     case 15:
                         message.handleType = 15;
                         break;
-                    case "HOST_VALUE_ERROR":
+                    case "HOST_VALUE_OPAQUE":
                     case 16:
                         message.handleType = 16;
                         break;
diff --git a/baml_language/sdks/python/rust/bridge_python/src/host_value.rs b/baml_language/sdks/python/rust/bridge_python/src/host_value.rs
index 49857e3607..ef4244df4d 100644
--- a/baml_language/sdks/python/rust/bridge_python/src/host_value.rs
+++ b/baml_language/sdks/python/rust/bridge_python/src/host_value.rs
@@ -99,17 +99,17 @@ pub fn register_host_callable(callable: Py<PyAny>) -> u64 {
     key
 }
 
-/// Insert a Python exception object into the registry and return its key.
+/// Insert an arbitrary host Python object into the registry and return its key.
 ///
-/// Used by the host-throw path to register the originating native
+/// The host-throw path uses this to register the originating native
 /// exception so the BAML→host decoder on the same runtime can resolve
 /// the `_handle` slot of a `baml.errors.HostCallable` back to the
 /// original Python object on round-trip. The table is shared with
 /// callable entries (keys are globally unique), and the same
 /// `host_release_callback` releases either kind on last-Arc-drop.
-fn register_host_error(exc: Py<PyAny>) -> u64 {
+fn register_host_opaque(value: Py<PyAny>) -> u64 {
     let key = next_key();
-    REGISTRY.table.lock().unwrap().insert(key, exc);
+    REGISTRY.table.lock().unwrap().insert(key, value);
     key
 }
 
@@ -153,7 +153,7 @@ pub extern "C" fn host_release_callback(host_value_key: u64) {
 
 /// Look up the host-registered Python object referenced by a
 /// `BamlPyHandle` whose `handle_type` is `HOST_VALUE_CALLABLE` /
-/// `HOST_VALUE_ERROR`, returning a fresh strong reference if the entry
+/// `HOST_VALUE_OPAQUE`, returning a fresh strong reference if the entry
 /// is still live. Used by the outbound error decoder in
 /// `baml_core.proto` to rehydrate a `baml.errors.HostCallable` thrown
 /// by BAML back to the original Python exception object on same-host
@@ -172,7 +172,7 @@ pub fn lookup_host_value(
     use bridge_ctypes::baml_core::cffi::BamlHandleType;
     let ht_i32 = i32::try_from(handle.handle_type).ok()?;
     if ht_i32 != BamlHandleType::HostValueCallable as i32
-        && ht_i32 != BamlHandleType::HostValueError as i32
+        && ht_i32 != BamlHandleType::HostValueOpaque as i32
     {
         return None;
     }
@@ -462,9 +462,9 @@ fn send_dispatch_success(call_id: u32, bytes: &[u8]) {
 
 /// Build an `InboundValue` carrying a `baml.errors.HostCallable` Instance.
 /// `handle_key` references the originating native exception in the
-/// process-global registry (set by [`register_host_error`]); the BAML
+/// process-global registry (set by [`register_host_opaque`]); the BAML
 /// class's `_handle` field carries it as a `BamlHandle` of type
-/// `HOST_VALUE_ERROR` so a same-host decoder can rehydrate the exact
+/// `HOST_VALUE_OPAQUE` so a same-host decoder can rehydrate the exact
 /// Python exception object on round-trip. The remaining
 /// `class_name` / `message` / `language` / `traceback` fields are
 /// metadata for debugging/printing/user convenience and do not
@@ -488,7 +488,7 @@ fn build_host_callable_inbound(
         value: Some(InboundValue {
             value: Some(InboundValueVariant::Handle(BamlHandle {
                 key: handle_key,
-                handle_type: BamlHandleType::HostValueError as i32,
+                handle_type: BamlHandleType::HostValueOpaque as i32,
             })),
         }),
     };
@@ -627,7 +627,7 @@ fn send_dispatch_error_from_pyerr(call_id: u32, py: Python<'_>, py_err: &pyo3::P
     // host-value table so the BAML→host decoder on this runtime can
     // resolve `_handle` back to the original `ValueError`/`KeyError`/...
     // object on round-trip.
-    let handle_key = register_host_error(py_err.value(py).clone().unbind().into_any());
+    let handle_key = register_host_opaque(py_err.value(py).clone().unbind().into_any());
 
     let bytes =
         build_host_callable_inbound(&class_name, &message, traceback.as_deref(), handle_key)
diff --git a/baml_language/sdks/python/rust/bridge_python/src/py_handle.rs b/baml_language/sdks/python/rust/bridge_python/src/py_handle.rs
index aeb9da7ac7..4b3c3dbe9d 100644
--- a/baml_language/sdks/python/rust/bridge_python/src/py_handle.rs
+++ b/baml_language/sdks/python/rust/bridge_python/src/py_handle.rs
@@ -97,7 +97,7 @@ impl BamlPyHandle {
 
 impl Drop for BamlPyHandle {
     fn drop(&mut self) {
-        // Host-owned handles (`HostValueCallable`, `HostValueError`) are
+        // Host-owned handles (`HostValueCallable`, `HostValueOpaque`) are
         // *not* tracked in `HANDLE_TABLE` — their lifetime is managed
         // per-bridge via the host-value registry (see
         // [`crate::host_value::lookup_host_value`]). Releasing them here
@@ -111,7 +111,7 @@ impl Drop for BamlPyHandle {
         use bridge_ctypes::baml_core::cffi::BamlHandleType;
         let ht_i32 = i32::try_from(self.handle_type).unwrap_or(-1);
         let is_host_value = ht_i32 == BamlHandleType::HostValueCallable as i32
-            || ht_i32 == BamlHandleType::HostValueError as i32;
+            || ht_i32 == BamlHandleType::HostValueOpaque as i32;
         if !is_host_value {
             let _ = unsafe { baml_handle_release(self.handle_key) };
         }
diff --git a/baml_language/sdks/python/src/baml_core/baml_py.pyi b/baml_language/sdks/python/src/baml_core/baml_py.pyi
index a4c07717a7..0437ca13ce 100644
--- a/baml_language/sdks/python/src/baml_core/baml_py.pyi
+++ b/baml_language/sdks/python/src/baml_core/baml_py.pyi
@@ -451,7 +451,7 @@ def lookup_host_value(handle: BamlPyHandle) -> typing.Optional[typing.Any]:
     r"""
     Look up the host-registered Python object referenced by a
     `BamlPyHandle` whose `handle_type` is `HOST_VALUE_CALLABLE` /
-    `HOST_VALUE_ERROR`, returning a fresh strong reference if the entry
+    `HOST_VALUE_OPAQUE`, returning a fresh strong reference if the entry
     is still live. Used by the outbound error decoder in
     `baml_core.proto` to rehydrate a `baml.errors.HostCallable` thrown
     by BAML back to the original Python exception object on same-host
diff --git a/baml_language/sdks/python/src/baml_core/cffi/v1/baml_inbound_pb2.py b/baml_language/sdks/python/src/baml_core/cffi/v1/baml_inbound_pb2.py
index ef653a40db..135be0f7dc 100644
--- a/baml_language/sdks/python/src/baml_core/cffi/v1/baml_inbound_pb2.py
+++ b/baml_language/sdks/python/src/baml_core/cffi/v1/baml_inbound_pb2.py
@@ -24,7 +24,7 @@
 
 
 
-DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n$baml_core/cffi/v1/baml_inbound.proto\x12\x11\x62\x61ml_core.cffi.v1\"Q\n\nBamlHandle\x12\x0b\n\x03key\x18\x01 \x01(\x04\x12\x36\n\x0bhandle_type\x18\x02 \x01(\x0e\x32!.baml_core.cffi.v1.BamlHandleType\"\xc8\x03\n\x0cInboundValue\x12\x16\n\x0cstring_value\x18\x02 \x01(\tH\x00\x12\x13\n\tint_value\x18\x03 \x01(\x03H\x00\x12\x15\n\x0b\x66loat_value\x18\x04 \x01(\x01H\x00\x12\x14\n\nbool_value\x18\x05 \x01(\x08H\x00\x12\x39\n\nlist_value\x18\x06 \x01(\x0b\x32#.baml_core.cffi.v1.InboundListValueH\x00\x12\x37\n\tmap_value\x18\x07 \x01(\x0b\x32\".baml_core.cffi.v1.InboundMapValueH\x00\x12;\n\x0b\x63lass_value\x18\x08 \x01(\x0b\x32$.baml_core.cffi.v1.InboundClassValueH\x00\x12\x39\n\nenum_value\x18\t \x01(\x0b\x32#.baml_core.cffi.v1.InboundEnumValueH\x00\x12/\n\x06handle\x18\n \x01(\x0b\x32\x1d.baml_core.cffi.v1.BamlHandleH\x00\x12\x1a\n\x10uint8array_value\x18\x0b \x01(\x0cH\x00\x12\x16\n\x0c\x62igint_value\x18\x0c \x01(\tH\x00\x42\x07\n\x05valueJ\x04\x08\x01\x10\x02\"C\n\x10InboundListValue\x12/\n\x06values\x18\x01 \x03(\x0b\x32\x1f.baml_core.cffi.v1.InboundValue\"F\n\x0fInboundMapValue\x12\x33\n\x07\x65ntries\x18\x01 \x03(\x0b\x32\".baml_core.cffi.v1.InboundMapEntry\"\xbe\x01\n\x0fInboundMapEntry\x12\x14\n\nstring_key\x18\x01 \x01(\tH\x00\x12\x11\n\x07int_key\x18\x02 \x01(\x03H\x00\x12\x12\n\x08\x62ool_key\x18\x03 \x01(\x08H\x00\x12\x37\n\x08\x65num_key\x18\x05 \x01(\x0b\x32#.baml_core.cffi.v1.InboundEnumValueH\x00\x12.\n\x05value\x18\x06 \x01(\x0b\x32\x1f.baml_core.cffi.v1.InboundValueB\x05\n\x03key\"U\n\x11InboundClassValue\x12\x0c\n\x04name\x18\x01 \x01(\t\x12\x32\n\x06\x66ields\x18\x02 \x03(\x0b\x32\".baml_core.cffi.v1.InboundMapEntry\"/\n\x10InboundEnumValue\x12\x0c\n\x04name\x18\x01 \x01(\t\x12\r\n\x05value\x18\x02 \x01(\t\"W\n\x10\x43\x61llFunctionArgs\x12\x32\n\x06kwargs\x18\x01 \x03(\x0b\x32\".baml_core.cffi.v1.InboundMapEntry\x12\x0f\n\x07\x63\x61ll_id\x18\x02 \x01(\x04\"&\n\x07\x43\x61llAck\x12\x0f\n\x05\x65rror\x18\x01 \x01(\tH\x00\x42\n\n\x08response*\xde\x02\n\x0e\x42\x61mlHandleType\x12\x16\n\x12HANDLE_UNSPECIFIED\x10\x00\x12\x16\n\x12UNTAGGED_RUST_DATA\x10\x01\x12\x15\n\x11UNTAGGED_BEX_HEAP\x10\x02\x12\x10\n\x0c\x46UNCTION_REF\x10\x05\x12\x13\n\x0f\x41\x44T_MEDIA_IMAGE\x10\x06\x12\x13\n\x0f\x41\x44T_MEDIA_AUDIO\x10\x07\x12\x13\n\x0f\x41\x44T_MEDIA_VIDEO\x10\x08\x12\x11\n\rADT_MEDIA_PDF\x10\t\x12\x15\n\x11\x41\x44T_MEDIA_GENERIC\x10\n\x12\x12\n\x0e\x41\x44T_PROMPT_AST\x10\x0b\x12\x11\n\rADT_COLLECTOR\x10\x0c\x12\x0c\n\x08\x41\x44T_TYPE\x10\r\x12\x1a\n\x16\x41\x44T_TAGGED_HEAP_HANDLE\x10\x0e\x12\x17\n\x13HOST_VALUE_CALLABLE\x10\x0f\x12\x14\n\x10HOST_VALUE_ERROR\x10\x10\"\x04\x08\x03\x10\x03\"\x04\x08\x04\x10\x04\x42\x08Z\x06./cffib\x06proto3')
+DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n$baml_core/cffi/v1/baml_inbound.proto\x12\x11\x62\x61ml_core.cffi.v1\"Q\n\nBamlHandle\x12\x0b\n\x03key\x18\x01 \x01(\x04\x12\x36\n\x0bhandle_type\x18\x02 \x01(\x0e\x32!.baml_core.cffi.v1.BamlHandleType\"\xc8\x03\n\x0cInboundValue\x12\x16\n\x0cstring_value\x18\x02 \x01(\tH\x00\x12\x13\n\tint_value\x18\x03 \x01(\x03H\x00\x12\x15\n\x0b\x66loat_value\x18\x04 \x01(\x01H\x00\x12\x14\n\nbool_value\x18\x05 \x01(\x08H\x00\x12\x39\n\nlist_value\x18\x06 \x01(\x0b\x32#.baml_core.cffi.v1.InboundListValueH\x00\x12\x37\n\tmap_value\x18\x07 \x01(\x0b\x32\".baml_core.cffi.v1.InboundMapValueH\x00\x12;\n\x0b\x63lass_value\x18\x08 \x01(\x0b\x32$.baml_core.cffi.v1.InboundClassValueH\x00\x12\x39\n\nenum_value\x18\t \x01(\x0b\x32#.baml_core.cffi.v1.InboundEnumValueH\x00\x12/\n\x06handle\x18\n \x01(\x0b\x32\x1d.baml_core.cffi.v1.BamlHandleH\x00\x12\x1a\n\x10uint8array_value\x18\x0b \x01(\x0cH\x00\x12\x16\n\x0c\x62igint_value\x18\x0c \x01(\tH\x00\x42\x07\n\x05valueJ\x04\x08\x01\x10\x02\"C\n\x10InboundListValue\x12/\n\x06values\x18\x01 \x03(\x0b\x32\x1f.baml_core.cffi.v1.InboundValue\"F\n\x0fInboundMapValue\x12\x33\n\x07\x65ntries\x18\x01 \x03(\x0b\x32\".baml_core.cffi.v1.InboundMapEntry\"\xbe\x01\n\x0fInboundMapEntry\x12\x14\n\nstring_key\x18\x01 \x01(\tH\x00\x12\x11\n\x07int_key\x18\x02 \x01(\x03H\x00\x12\x12\n\x08\x62ool_key\x18\x03 \x01(\x08H\x00\x12\x37\n\x08\x65num_key\x18\x05 \x01(\x0b\x32#.baml_core.cffi.v1.InboundEnumValueH\x00\x12.\n\x05value\x18\x06 \x01(\x0b\x32\x1f.baml_core.cffi.v1.InboundValueB\x05\n\x03key\"U\n\x11InboundClassValue\x12\x0c\n\x04name\x18\x01 \x01(\t\x12\x32\n\x06\x66ields\x18\x02 \x03(\x0b\x32\".baml_core.cffi.v1.InboundMapEntry\"/\n\x10InboundEnumValue\x12\x0c\n\x04name\x18\x01 \x01(\t\x12\r\n\x05value\x18\x02 \x01(\t\"W\n\x10\x43\x61llFunctionArgs\x12\x32\n\x06kwargs\x18\x01 \x03(\x0b\x32\".baml_core.cffi.v1.InboundMapEntry\x12\x0f\n\x07\x63\x61ll_id\x18\x02 \x01(\x04\"&\n\x07\x43\x61llAck\x12\x0f\n\x05\x65rror\x18\x01 \x01(\tH\x00\x42\n\n\x08response*\xdf\x02\n\x0e\x42\x61mlHandleType\x12\x16\n\x12HANDLE_UNSPECIFIED\x10\x00\x12\x16\n\x12UNTAGGED_RUST_DATA\x10\x01\x12\x15\n\x11UNTAGGED_BEX_HEAP\x10\x02\x12\x10\n\x0c\x46UNCTION_REF\x10\x05\x12\x13\n\x0f\x41\x44T_MEDIA_IMAGE\x10\x06\x12\x13\n\x0f\x41\x44T_MEDIA_AUDIO\x10\x07\x12\x13\n\x0f\x41\x44T_MEDIA_VIDEO\x10\x08\x12\x11\n\rADT_MEDIA_PDF\x10\t\x12\x15\n\x11\x41\x44T_MEDIA_GENERIC\x10\n\x12\x12\n\x0e\x41\x44T_PROMPT_AST\x10\x0b\x12\x11\n\rADT_COLLECTOR\x10\x0c\x12\x0c\n\x08\x41\x44T_TYPE\x10\r\x12\x1a\n\x16\x41\x44T_TAGGED_HEAP_HANDLE\x10\x0e\x12\x17\n\x13HOST_VALUE_CALLABLE\x10\x0f\x12\x15\n\x11HOST_VALUE_OPAQUE\x10\x10\"\x04\x08\x03\x10\x03\"\x04\x08\x04\x10\x04\x42\x08Z\x06./cffib\x06proto3')
 
 _globals = globals()
 _builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, _globals)
@@ -33,7 +33,7 @@
   _globals['DESCRIPTOR']._loaded_options = None
   _globals['DESCRIPTOR']._serialized_options = b'Z\006./cffi'
   _globals['_BAMLHANDLETYPE']._serialized_start=1201
-  _globals['_BAMLHANDLETYPE']._serialized_end=1551
+  _globals['_BAMLHANDLETYPE']._serialized_end=1552
   _globals['_BAMLHANDLE']._serialized_start=59
   _globals['_BAMLHANDLE']._serialized_end=140
   _globals['_INBOUNDVALUE']._serialized_start=143
diff --git a/baml_language/sdks/python/src/baml_core/cffi/v1/baml_inbound_pb2.pyi b/baml_language/sdks/python/src/baml_core/cffi/v1/baml_inbound_pb2.pyi
index 11314929d1..f6b6bab6a5 100644
--- a/baml_language/sdks/python/src/baml_core/cffi/v1/baml_inbound_pb2.pyi
+++ b/baml_language/sdks/python/src/baml_core/cffi/v1/baml_inbound_pb2.pyi
@@ -23,7 +23,7 @@ class BamlHandleType(int, metaclass=_enum_type_wrapper.EnumTypeWrapper):
     ADT_TYPE: _ClassVar[BamlHandleType]
     ADT_TAGGED_HEAP_HANDLE: _ClassVar[BamlHandleType]
     HOST_VALUE_CALLABLE: _ClassVar[BamlHandleType]
-    HOST_VALUE_ERROR: _ClassVar[BamlHandleType]
+    HOST_VALUE_OPAQUE: _ClassVar[BamlHandleType]
 HANDLE_UNSPECIFIED: BamlHandleType
 UNTAGGED_RUST_DATA: BamlHandleType
 UNTAGGED_BEX_HEAP: BamlHandleType
@@ -38,7 +38,7 @@ ADT_COLLECTOR: BamlHandleType
 ADT_TYPE: BamlHandleType
 ADT_TAGGED_HEAP_HANDLE: BamlHandleType
 HOST_VALUE_CALLABLE: BamlHandleType
-HOST_VALUE_ERROR: BamlHandleType
+HOST_VALUE_OPAQUE: BamlHandleType
 
 class BamlHandle(_message.Message):
     __slots__ = ("key", "handle_type")
diff --git a/baml_language/sdks/python/src/baml_core/proto.py b/baml_language/sdks/python/src/baml_core/proto.py
index e587ab8590..2cecb9ae94 100644
--- a/baml_language/sdks/python/src/baml_core/proto.py
+++ b/baml_language/sdks/python/src/baml_core/proto.py
@@ -690,7 +690,7 @@ def decode_value(holder, type_map: BamlTypeMap) -> Any:
     return None
 
 
-def _try_rehydrate_host_callable(decoded: Any) -> Optional[BaseException]:
+def _try_rehydrate_host_value(decoded: Any) -> Optional[BaseException]:
     """If `decoded` is a `baml.errors.HostCallable` pydantic instance
     whose `_handle` points at a still-live entry in this runtime's
     host-value registry, return the *original* Python exception object.
@@ -749,7 +749,7 @@ def decode_call_result(data: bytes) -> Any:
         # released keys (last `HostValueArc` clone already dropped) fall
         # through to the metadata-bearing `BamlError` wrapper below.
         if _outbound_class_fqn(msg.value) == "baml.errors.HostCallable":
-            rehydrated = _try_rehydrate_host_callable(decoded)
+            rehydrated = _try_rehydrate_host_value(decoded)
             if rehydrated is not None:
                 raise attach_baml_traceback(rehydrated)
         raise attach_baml_traceback(