diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0c779c63..3d2733a8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,7 @@ Bug fixes
 * Missing `to_hex`, `to_octal` and `to_binary` for `i128` and `u128` are added.
 * `remove` for arrays and BLOB's now treat negative index correctly.
 * `parse_int` now works properly for negative numbers.
+* `Engine::gen_fn_signatures` now generates signatures for external packages registered via `Engine::register_global_module`.
 
 Enhancements
 ------------
diff --git a/src/api/register.rs b/src/api/register.rs
index 07fe973b..b489a2b8 100644
--- a/src/api/register.rs
+++ b/src/api/register.rs
@@ -1027,7 +1027,8 @@ impl Engine {
     /// Functions from the following sources are included, in order:
     /// 1) Functions registered into the global namespace
     /// 2) Functions in registered sub-modules
-    /// 3) Functions in packages (optional)
+    /// 3) Functions in registered packages
+    /// 4) Functions in standard packages (optional)
     #[cfg(feature = "metadata")]
     #[inline]
     #[must_use]
@@ -1040,14 +1041,13 @@ impl Engine {
             signatures.extend(m.gen_fn_signatures().map(|f| format!("{}::{}", name, f)))
         });
 
-        if include_packages {
-            signatures.extend(
-                self.global_modules
-                    .iter()
-                    .skip(1)
-                    .flat_map(|m| m.gen_fn_signatures()),
-            );
-        }
+        signatures.extend(
+            self.global_modules
+                .iter()
+                .skip(1)
+                .filter(|m| !m.internal && (include_packages || !m.standard))
+                .flat_map(|m| m.gen_fn_signatures()),
+        );
 
         signatures
     }
diff --git a/src/module/mod.rs b/src/module/mod.rs
index 8181edce..4381c530 100644
--- a/src/module/mod.rs
+++ b/src/module/mod.rs
@@ -182,11 +182,6 @@ impl FuncInfo {
                 .collect();
             sig.push_str(&params.join(", "));
             sig.push(')');
-
-            if !return_type.is_empty() {
-                sig.push_str(" -> ");
-                sig.push_str(&return_type);
-            }
         } else {
             for x in 0..self.metadata.params {
                 sig.push('_');
@@ -194,17 +189,12 @@ impl FuncInfo {
                     sig.push_str(", ");
                 }
             }
-
             sig.push(')');
+        }
 
-            if !self.func.is_script() {
-                sig.push(')');
-
-                if !return_type.is_empty() {
-                    sig.push_str(" -> ");
-                    sig.push_str(&return_type);
-                }
-            }
+        if !self.func.is_script() && !return_type.is_empty() {
+            sig.push_str(" -> ");
+            sig.push_str(&return_type);
         }
 
         sig
@@ -596,7 +586,7 @@ impl Module {
                     #[cfg(feature = "metadata")]
                     params_info,
                     #[cfg(feature = "metadata")]
-                    return_type: "Dynamic".into(),
+                    return_type: "".into(),
                     #[cfg(feature = "metadata")]
                     comments: None,
                 },
diff --git a/src/serde/metadata.rs b/src/serde/metadata.rs
index 3e1919e0..ded1e362 100644
--- a/src/serde/metadata.rs
+++ b/src/serde/metadata.rs
@@ -196,11 +196,12 @@ impl Engine {
     /// 1) Functions defined in an [`AST`][crate::AST]
     /// 2) Functions registered into the global namespace
     /// 3) Functions in static modules
-    /// 4) Functions in global modules (optional)
+    /// 4) Functions in registered global packages
+    /// 5) Functions in standard packages (optional)
     pub fn gen_fn_metadata_with_ast_to_json(
         &self,
         ast: &AST,
-        include_global: bool,
+        include_packages: bool,
     ) -> serde_json::Result<String> {
         let _ast = ast;
         let mut global = ModuleMetadata::new();
@@ -211,14 +212,20 @@ impl Engine {
 
         self.global_modules
             .iter()
-            .take(if include_global { usize::MAX } else { 1 })
+            .filter(|m| include_packages || !m.standard)
             .flat_map(|m| m.iter_fn())
-            .for_each(|f| global.functions.push(f.into()));
+            .for_each(|f| {
+                let mut meta: FnMetadata = f.into();
+                meta.namespace = FnNamespace::Global;
+                global.functions.push(meta);
+            });
 
         #[cfg(not(feature = "no_function"))]
-        _ast.shared_lib()
-            .iter_fn()
-            .for_each(|f| global.functions.push(f.into()));
+        _ast.shared_lib().iter_fn().for_each(|f| {
+            let mut meta: FnMetadata = f.into();
+            meta.namespace = FnNamespace::Global;
+            global.functions.push(meta);
+        });
 
         global.functions.sort();
 
@@ -233,7 +240,7 @@ impl Engine {
     /// 2) Functions in static modules
     /// 3) Functions in global modules (optional)
     #[inline(always)]
-    pub fn gen_fn_metadata_to_json(&self, include_global: bool) -> serde_json::Result<String> {
-        self.gen_fn_metadata_with_ast_to_json(&AST::empty(), include_global)
+    pub fn gen_fn_metadata_to_json(&self, include_packages: bool) -> serde_json::Result<String> {
+        self.gen_fn_metadata_with_ast_to_json(&AST::empty(), include_packages)
     }
 }