diff --git a/src/main/java/nextflow/lsp/ast/ASTNodeStringUtils.java b/src/main/java/nextflow/lsp/ast/ASTNodeStringUtils.java
index 9e47a604..51a4566a 100644
--- a/src/main/java/nextflow/lsp/ast/ASTNodeStringUtils.java
+++ b/src/main/java/nextflow/lsp/ast/ASTNodeStringUtils.java
@@ -415,6 +415,9 @@ else if( Logger.isDebugEnabled() ) {
     }
 
     private static boolean isDeclaringTypeVisible(ClassNode declaringType) {
+        // plugin functions have no declaring type
+        if( ClassHelper.isDynamicTyped(declaringType) )
+            return false;
         if( declaringType.implementsInterface(ClassHelper.makeCached(DslScope.class)) )
             return false;
         if( declaringType.implementsInterface(ClassHelper.makeCached(Namespace.class)) )
diff --git a/src/main/java/nextflow/lsp/spec/ScriptSpecFactory.java b/src/main/java/nextflow/lsp/spec/ScriptSpecFactory.java
index 1e8c792e..805ed934 100644
--- a/src/main/java/nextflow/lsp/spec/ScriptSpecFactory.java
+++ b/src/main/java/nextflow/lsp/spec/ScriptSpecFactory.java
@@ -113,7 +113,9 @@ private static ClassNode fromType(Object type) {
     }
 
     private static ClassNode rawType(String name) {
-        return STANDARD_TYPES.getOrDefault(name, ClassHelper.dynamicType());
+        var type = STANDARD_TYPES.get(name);
+        // a raw type, not the generic declaration (e.g. List, not List<E>)
+        return type != null ? type.getPlainNodeReference() : ClassHelper.dynamicType();
     }
 
 }
diff --git a/src/test/java/nextflow/lsp/services/script/ScriptHoverTest.java b/src/test/java/nextflow/lsp/services/script/ScriptHoverTest.java
index 4c6ddc4f..31da152d 100644
--- a/src/test/java/nextflow/lsp/services/script/ScriptHoverTest.java
+++ b/src/test/java/nextflow/lsp/services/script/ScriptHoverTest.java
@@ -85,6 +85,28 @@ def make() {
         assertThat(value).isEqualTo("```nextflow\ndef make() -> Channel<Integer>\n```");
     }
 
+    @Test
+    void showSignatureWhenHoveringOverPluginFunctionCall() {
+        var server = TestServer.start();
+        var uri = getUri("main.nf");
+
+        server.open("nextflow.config", "plugins { id 'nf-schema@2.7.3' }");
+        server.settle();
+        server.open("main.nf", """
+            nextflow.enable.types = true
+
+            include { samplesheetToList } from 'plugin/nf-schema'
+
+            workflow {
+                samplesheetToList('s.csv', 'schema.json')
+            }
+            """);
+        server.settle();
+        var value = getHoverHint(server, uri, new Position(5, 5));
+
+        assertThat(value).isEqualTo("```nextflow\nsamplesheetToList(arg0, arg1) -> List\n```");
+    }
+
     @Test
     void showLabelWhenHoveringOverWorkflowInvocation() {
         var server = TestServer.start();