diff --git a/server/src/steel/handlers.rs b/server/src/steel/handlers.rs
index a918992..81a847a 100644
--- a/server/src/steel/handlers.rs
+++ b/server/src/steel/handlers.rs
@@ -1,4 +1,6 @@
 // src/steel/handlers.rs
 pub mod evaluator;
+pub mod engine;
 
-pub use evaluator::{validate_script, validate_target_column};
+pub use engine::validate_steel_script;
+pub use evaluator::validate_target_column;
diff --git a/server/src/steel/handlers/engine.rs b/server/src/steel/handlers/engine.rs
new file mode 100644
index 0000000..3bf3ec4
--- /dev/null
+++ b/server/src/steel/handlers/engine.rs
@@ -0,0 +1,34 @@
+// src/steel/handlers/engine.rs
+use steel_core::{steel_vm::engine::Engine, rvals::SteelVal};
+use tonic::Status;
+
+pub fn validate_steel_script(script: &str) -> Result<(), Status> {
+    let mut engine = Engine::new();
+
+    // Basic syntax check
+    let parsed = engine.compile(script).map_err(|e| {
+        Status::invalid_argument(format!("Syntax error: {}", e))
+    })?;
+
+    // Validate required function signature
+    let has_transform = parsed.iter().any(|expr| match expr {
+        SteelVal::Func(f) => f.name() == Some("transform"),
+        _ => false,
+    });
+
+    if !has_transform {
+        return Err(Status::invalid_argument(
+            "Script must contain a 'transform' function"
+        ));
+    }
+
+    // Simple sandboxed execution test
+    let test_input = SteelVal::StringV("test_data".into());
+
+    engine.call_function("transform", vec![test_input])
+        .map_err(|e| {
+            Status::invalid_argument(format!("Runtime validation failed: {}", e))
+        })?;
+
+    Ok(())
+}
diff --git a/server/src/steel/handlers/evaluator.rs b/server/src/steel/handlers/evaluator.rs
index 1d686af..c0b74dd 100644
--- a/server/src/steel/handlers/evaluator.rs
+++ b/server/src/steel/handlers/evaluator.rs
@@ -1,9 +1,9 @@
 // src/steel/handlers/evaluator.rs
+use crate::validation::script::validate_script;
 use serde_json::Value;
 
 const SYSTEM_COLUMNS: &[&str] = &["id", "deleted", "firma", "created_at"];
 
-// Column validation
 pub fn validate_target_column(
     table_name: &str,
     target: &str,
@@ -22,11 +22,3 @@ pub fn validate_target_column(
 
     Ok(())
 }
-
-// Basic script validation
-pub fn validate_script(script: &str) -> Result<(), String> {
-    if script.trim().is_empty() {
-        return Err("Script cannot be empty".to_string());
-    }
-    Ok(())
-}
diff --git a/server/src/steel/mod.rs b/server/src/steel/mod.rs
index c89ced1..181dd66 100644
--- a/server/src/steel/mod.rs
+++ b/server/src/steel/mod.rs
@@ -1,3 +1,4 @@
 // src/steel/mod.rs
 
 pub mod handlers;
+pub mod validation;
diff --git a/server/src/steel/validation/script.rs b/server/src/steel/validation/script.rs
new file mode 100644
index 0000000..427fafc
--- /dev/null
+++ b/server/src/steel/validation/script.rs
@@ -0,0 +1,30 @@
+// src/steel/validation/script.rs
+use std::fmt;
+use super::handlers::engine::validate_steel_script;
+use tonic::Status;
+
+#[derive(Debug)]
+pub enum ScriptValidationError {
+    EmptyScript,
+    SteelValidation(String),
+}
+
+impl fmt::Display for ScriptValidationError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            ScriptValidationError::EmptyScript => write!(f, "Script cannot be empty"),
+            ScriptValidationError::SteelValidation(msg) => write!(f, "Steel validation error: {}", msg),
+        }
+    }
+}
+
+pub fn validate_script(script: &str) -> Result<(), ScriptValidationError> {
+    if script.trim().is_empty() {
+        return Err(ScriptValidationError::EmptyScript);
+    }
+
+    validate_steel_script(script)
+        .map_err(|e| ScriptValidationError::SteelValidation(e.message().to_string()))?;
+
+    Ok(())
+}
diff --git a/server/src/table_script/handlers/post_table_script.rs b/server/src/table_script/handlers/post_table_script.rs
index 31b6431..ca9695f 100644
--- a/server/src/table_script/handlers/post_table_script.rs
+++ b/server/src/table_script/handlers/post_table_script.rs
@@ -2,7 +2,8 @@
 use tonic::Status;
 use sqlx::{PgPool, Error as SqlxError};
 use common::proto::multieko2::table_script::{PostTableScriptRequest, TableScriptResponse};
-use crate::steel::handlers::evaluator::{validate_script, validate_target_column};
+use crate::steel::handlers::evaluator::validate_target_column;
+use crate::steel::validation::script::validate_script;
 
 pub async fn post_table_script(
     db_pool: &PgPool,
@@ -20,8 +21,8 @@ pub async fn post_table_script(
     .ok_or_else(|| Status::not_found("Table definition not found"))?;
 
     // Call validation functions
-    validate_script(&request.script)  // Changed from validate_syntax to validate_script
-        .map_err(|e| Status::invalid_argument(e))?;
+    validate_script(&request.script)
+        .map_err(|e| Status::invalid_argument(e.to_string()))?;
 
     validate_target_column(&table_def.table_name, &request.target_column, &table_def.columns)
         .map_err(|e| Status::invalid_argument(e))?;