diff --git a/internal/index/index.go b/internal/index/index.go
index 327a9b1..f583a52 100644
--- a/internal/index/index.go
+++ b/internal/index/index.go
@@ -51,6 +51,7 @@ type ProjectNode struct {
 	Parent    *ProjectNode
 	Metadata  map[string]string // Store extra info like Class, Type, Size
 	Target    *ProjectNode      // Points to referenced node (for Direct References/Links)
+	Pragmas   []string
 }
 
 type Fragment struct {
@@ -201,6 +202,7 @@ func (pt *ProjectTree) populateNode(node *ProjectNode, file string, config *pars
 
 	for _, def := range config.Definitions {
 		doc := pt.findDoc(config.Comments, def.Pos())
+		pragmas := pt.findPragmas(config.Pragmas, def.Pos())
 
 		switch d := def.(type) {
 		case *parser.Field:
@@ -229,7 +231,11 @@ func (pt *ProjectTree) populateNode(node *ProjectNode, file string, config *pars
 				child.Doc += doc
 			}
 
-			pt.addObjectFragment(child, file, d, doc, config.Comments)
+			if len(pragmas) > 0 {
+				child.Pragmas = append(child.Pragmas, pragmas...)
+			}
+
+			pt.addObjectFragment(child, file, d, doc, config.Comments, config.Pragmas)
 		}
 	}
 
@@ -238,7 +244,7 @@ func (pt *ProjectTree) populateNode(node *ProjectNode, file string, config *pars
 	}
 }
 
-func (pt *ProjectTree) addObjectFragment(node *ProjectNode, file string, obj *parser.ObjectNode, doc string, comments []parser.Comment) {
+func (pt *ProjectTree) addObjectFragment(node *ProjectNode, file string, obj *parser.ObjectNode, doc string, comments []parser.Comment, pragmas []parser.Pragma) {
 	frag := &Fragment{
 		File:      file,
 		IsObject:  true,
@@ -248,6 +254,7 @@ func (pt *ProjectTree) addObjectFragment(node *ProjectNode, file string, obj *pa
 
 	for _, def := range obj.Subnode.Definitions {
 		subDoc := pt.findDoc(comments, def.Pos())
+		subPragmas := pt.findPragmas(pragmas, def.Pos())
 
 		switch d := def.(type) {
 		case *parser.Field:
@@ -277,7 +284,11 @@ func (pt *ProjectTree) addObjectFragment(node *ProjectNode, file string, obj *pa
 				child.Doc += subDoc
 			}
 
-			pt.addObjectFragment(child, file, d, subDoc, comments)
+			if len(subPragmas) > 0 {
+				child.Pragmas = append(child.Pragmas, subPragmas...)
+			}
+
+			pt.addObjectFragment(child, file, d, subDoc, comments, pragmas)
 		}
 	}
 
@@ -322,6 +333,30 @@ func (pt *ProjectTree) findDoc(comments []parser.Comment, pos parser.Position) s
 	return docBuilder.String()
 }
 
+func (pt *ProjectTree) findPragmas(pragmas []parser.Pragma, pos parser.Position) []string {
+	var found []string
+	targetLine := pos.Line - 1
+
+	for i := len(pragmas) - 1; i >= 0; i-- {
+		p := pragmas[i]
+		if p.Position.Line > pos.Line {
+			continue
+		}
+		if p.Position.Line == pos.Line {
+			continue
+		}
+
+		if p.Position.Line == targetLine {
+			txt := strings.TrimSpace(strings.TrimPrefix(p.Text, "//!"))
+			found = append(found, txt)
+			targetLine--
+		} else if p.Position.Line < targetLine {
+			break
+		}
+	}
+	return found
+}
+
 func (pt *ProjectTree) indexValue(file string, val parser.Value) {
 	switch v := val.(type) {
 	case *parser.ReferenceValue:
diff --git a/internal/validator/validator.go b/internal/validator/validator.go
index 5630120..bed53e9 100644
--- a/internal/validator/validator.go
+++ b/internal/validator/validator.go
@@ -2,6 +2,7 @@ package validator
 
 import (
 	"fmt"
+	"strings"
 
 	"github.com/marte-dev/marte-dev-tools/internal/index"
 	"github.com/marte-dev/marte-dev-tools/internal/parser"
@@ -353,12 +354,22 @@ func (v *Validator) validateGAMSignal(gamNode, signalNode *index.ProjectNode, di
 	}
 
 	if targetNode == nil {
-		v.Diagnostics = append(v.Diagnostics, Diagnostic{
-			Level:    LevelWarning,
-			Message:  fmt.Sprintf("Implicitly Defined Signal: '%s' is defined in GAM '%s' but not in DataSource '%s'", targetSignalName, gamNode.RealName, dsName),
-			Position: v.getNodePosition(signalNode),
-			File:     v.getNodeFile(signalNode),
-		})
+		suppress := false
+		for _, p := range signalNode.Pragmas {
+			if strings.HasPrefix(p, "implicit:") {
+				suppress = true
+				break
+			}
+		}
+
+		if !suppress {
+			v.Diagnostics = append(v.Diagnostics, Diagnostic{
+				Level:    LevelWarning,
+				Message:  fmt.Sprintf("Implicitly Defined Signal: '%s' is defined in GAM '%s' but not in DataSource '%s'", targetSignalName, gamNode.RealName, dsName),
+				Position: v.getNodePosition(signalNode),
+				File:     v.getNodeFile(signalNode),
+			})
+		}
 
 		if typeFields, ok := fields["Type"]; !ok || len(typeFields) == 0 {
 			v.Diagnostics = append(v.Diagnostics, Diagnostic{
@@ -367,6 +378,17 @@ func (v *Validator) validateGAMSignal(gamNode, signalNode *index.ProjectNode, di
 				Position: v.getNodePosition(signalNode),
 				File:     v.getNodeFile(signalNode),
 			})
+		} else {
+			// Check Type validity even for implicit
+			typeVal := v.getFieldValue(typeFields[0])
+			if !isValidType(typeVal) {
+				v.Diagnostics = append(v.Diagnostics, Diagnostic{
+					Level:    LevelError,
+					Message:  fmt.Sprintf("Invalid Type '%s' for Signal '%s'", typeVal, signalNode.RealName),
+					Position: typeFields[0].Position,
+					File:     v.getNodeFile(signalNode),
+				})
+			}
 		}
 	} else {
 		signalNode.Target = targetNode
@@ -376,9 +398,71 @@ func (v *Validator) validateGAMSignal(gamNode, signalNode *index.ProjectNode, di
 				v.updateReferenceTarget(v.getNodeFile(signalNode), val.Position, targetNode)
 			}
 		}
+		
+		// Property checks
+		v.checkSignalProperty(signalNode, targetNode, "Type")
+		v.checkSignalProperty(signalNode, targetNode, "NumberOfElements")
+		v.checkSignalProperty(signalNode, targetNode, "NumberOfDimensions")
+		
+		// Check Type validity if present
+		if typeFields, ok := fields["Type"]; ok && len(typeFields) > 0 {
+			typeVal := v.getFieldValue(typeFields[0])
+			if !isValidType(typeVal) {
+				v.Diagnostics = append(v.Diagnostics, Diagnostic{
+					Level:    LevelError,
+					Message:  fmt.Sprintf("Invalid Type '%s' for Signal '%s'", typeVal, signalNode.RealName),
+					Position: typeFields[0].Position,
+					File:     v.getNodeFile(signalNode),
+				})
+			}
+		}
 	}
 }
 
+func (v *Validator) checkSignalProperty(gamSig, dsSig *index.ProjectNode, prop string) {
+	gamVal := gamSig.Metadata[prop]
+	dsVal := dsSig.Metadata[prop]
+
+	if gamVal == "" {
+		return
+	}
+
+	if dsVal != "" && gamVal != dsVal {
+		if prop == "Type" {
+			if v.checkCastPragma(gamSig, dsVal, gamVal) {
+				return
+			}
+		}
+
+		v.Diagnostics = append(v.Diagnostics, Diagnostic{
+			Level:    LevelError,
+			Message:  fmt.Sprintf("Signal '%s' property '%s' mismatch: defined '%s', referenced '%s'", gamSig.RealName, prop, dsVal, gamVal),
+			Position: v.getNodePosition(gamSig),
+			File:     v.getNodeFile(gamSig),
+		})
+	}
+}
+
+func (v *Validator) checkCastPragma(node *index.ProjectNode, defType, curType string) bool {
+	for _, p := range node.Pragmas {
+		if strings.HasPrefix(p, "cast(") {
+			content := strings.TrimPrefix(p, "cast(")
+			if idx := strings.Index(content, ")"); idx != -1 {
+				content = content[:idx]
+				parts := strings.Split(content, ",")
+				if len(parts) == 2 {
+					d := strings.TrimSpace(parts[0])
+					c := strings.TrimSpace(parts[1])
+					if d == defType && c == curType {
+						return true
+					}
+				}
+			}
+		}
+	}
+	return false
+}
+
 func (v *Validator) updateReferenceTarget(file string, pos parser.Position, target *index.ProjectNode) {
 	for i := range v.Tree.References {
 		ref := &v.Tree.References[i]
@@ -409,6 +493,10 @@ func (v *Validator) getFieldValue(f *parser.Field) string {
 		return val.Value
 	case *parser.ReferenceValue:
 		return val.Value
+	case *parser.IntValue:
+		return val.Raw
+	case *parser.FloatValue:
+		return val.Raw
 	}
 	return ""
 }
@@ -533,14 +621,24 @@ func (v *Validator) collectTargetUsage(node *index.ProjectNode, referenced map[*
 }
 
 func (v *Validator) checkUnusedRecursive(node *index.ProjectNode, referenced map[*index.ProjectNode]bool) {
+	// Heuristic for GAM
 	if isGAM(node) {
 		if !referenced[node] {
-			v.Diagnostics = append(v.Diagnostics, Diagnostic{
-				Level:    LevelWarning,
-				Message:  fmt.Sprintf("Unused GAM: %s is defined but not referenced in any thread or scheduler", node.RealName),
-				Position: v.getNodePosition(node),
-				File:     v.getNodeFile(node),
-			})
+			suppress := false
+			for _, p := range node.Pragmas {
+				if strings.HasPrefix(p, "unused:") {
+					suppress = true
+					break
+				}
+			}
+			if !suppress {
+				v.Diagnostics = append(v.Diagnostics, Diagnostic{
+					Level:    LevelWarning,
+					Message:  fmt.Sprintf("Unused GAM: %s is defined but not referenced in any thread or scheduler", node.RealName),
+					Position: v.getNodePosition(node),
+					File:     v.getNodeFile(node),
+				})
+			}
 		}
 	}
 
@@ -549,12 +647,21 @@ func (v *Validator) checkUnusedRecursive(node *index.ProjectNode, referenced map
 		if signalsNode, ok := node.Children["Signals"]; ok {
 			for _, signal := range signalsNode.Children {
 				if !referenced[signal] {
-					v.Diagnostics = append(v.Diagnostics, Diagnostic{
-						Level:    LevelWarning,
-						Message:  fmt.Sprintf("Unused Signal: %s is defined in DataSource %s but never referenced", signal.RealName, node.RealName),
-						Position: v.getNodePosition(signal),
-						File:     v.getNodeFile(signal),
-					})
+					suppress := false
+					for _, p := range signal.Pragmas {
+						if strings.HasPrefix(p, "unused:") {
+							suppress = true
+							break
+						}
+					}
+					if !suppress {
+						v.Diagnostics = append(v.Diagnostics, Diagnostic{
+							Level:    LevelWarning,
+							Message:  fmt.Sprintf("Unused Signal: %s is defined in DataSource %s but never referenced", signal.RealName, node.RealName),
+							Position: v.getNodePosition(signal),
+							File:     v.getNodeFile(signal),
+						})
+					}
 				}
 			}
 		}
@@ -602,4 +709,4 @@ func (v *Validator) getNodeFile(node *index.ProjectNode) string {
 		return node.Fragments[0].File
 	}
 	return ""
-}
+}
\ No newline at end of file
diff --git a/mdt b/mdt
index 9eee343..f1ee76f 100755
Binary files a/mdt and b/mdt differ
diff --git a/test/validator_implicit_signal_test.go b/test/validator_implicit_signal_test.go
new file mode 100644
index 0000000..a2e0163
--- /dev/null
+++ b/test/validator_implicit_signal_test.go
@@ -0,0 +1,107 @@
+package integration
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/marte-dev/marte-dev-tools/internal/index"
+	"github.com/marte-dev/marte-dev-tools/internal/parser"
+	"github.com/marte-dev/marte-dev-tools/internal/validator"
+)
+
+func TestImplicitSignal(t *testing.T) {
+	content := `
++Data = {
+    Class = ReferenceContainer
+    +MyDS = {
+        Class = FileReader
+        Filename = "test"
+        Signals = {
+            ExplicitSig = { Type = uint32 }
+        }
+    }
+}
+
++MyGAM = {
+    Class = IOGAM
+    InputSignals = {
+        ExplicitSig = {
+            DataSource = MyDS
+            Type = uint32
+        }
+        ImplicitSig = {
+            DataSource = MyDS
+            Type = uint32
+        }
+    }
+}
+`
+	p := parser.NewParser(content)
+	config, err := p.Parse()
+	if err != nil {
+		t.Fatalf("Parse failed: %v", err)
+	}
+
+	idx := index.NewProjectTree()
+	idx.AddFile("implicit_signal.marte", config)
+	idx.ResolveReferences()
+
+	v := validator.NewValidator(idx, ".")
+	v.ValidateProject()
+
+	foundWarning := false
+	foundError := false
+
+	for _, d := range v.Diagnostics {
+		if strings.Contains(d.Message, "Implicitly Defined Signal") {
+			if strings.Contains(d.Message, "ImplicitSig") {
+				foundWarning = true
+			}
+		}
+		if strings.Contains(d.Message, "Signal 'ExplicitSig' not found") {
+			foundError = true
+		}
+	}
+
+	if !foundWarning || foundError {
+        for _, d := range v.Diagnostics {
+            t.Logf("Diagnostic: %s", d.Message)
+        }
+    }
+
+	if !foundWarning {
+		t.Error("Expected warning for ImplicitSig")
+	}
+	if foundError {
+		t.Error("Unexpected error for ExplicitSig")
+	}
+
+	// Test missing Type for implicit
+	contentMissingType := `
++Data = { Class = ReferenceContainer +DS={Class=FileReader Filename="" Signals={}} }
++GAM = { Class = IOGAM InputSignals = { Impl = { DataSource = DS } } }
+`
+	p2 := parser.NewParser(contentMissingType)
+	config2, err2 := p2.Parse()
+    if err2 != nil {
+        t.Fatalf("Parse2 failed: %v", err2)
+    }
+	idx2 := index.NewProjectTree()
+	idx2.AddFile("missing_type.marte", config2)
+	idx2.ResolveReferences()
+	v2 := validator.NewValidator(idx2, ".")
+	v2.ValidateProject()
+
+	foundTypeErr := false
+	for _, d := range v2.Diagnostics {
+		if strings.Contains(d.Message, "Implicit signal 'Impl' must define Type") {
+			foundTypeErr = true
+		}
+	}
+	if !foundTypeErr {
+        for _, d := range v2.Diagnostics {
+            t.Logf("Diagnostic2: %s", d.Message)
+        }
+		t.Error("Expected error for missing Type in implicit signal")
+	}
+}
diff --git a/test/validator_pragma_test.go b/test/validator_pragma_test.go
new file mode 100644
index 0000000..79b7531
--- /dev/null
+++ b/test/validator_pragma_test.go
@@ -0,0 +1,69 @@
+package integration
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/marte-dev/marte-dev-tools/internal/index"
+	"github.com/marte-dev/marte-dev-tools/internal/parser"
+	"github.com/marte-dev/marte-dev-tools/internal/validator"
+)
+
+func TestPragmaSuppression(t *testing.T) {
+	content := `
++Data = {
+    Class = ReferenceContainer
+    +MyDS = {
+        Class = FileReader
+        Filename = "test"
+        Signals = {
+            //!unused: Ignore this
+            UnusedSig = { Type = uint32 }
+            UsedSig = { Type = uint32 }
+        }
+    }
+}
+
++MyGAM = {
+    Class = IOGAM
+    InputSignals = {
+        UsedSig = { DataSource = MyDS Type = uint32 }
+        
+        //!implicit: Ignore this implicit
+        ImplicitSig = { DataSource = MyDS Type = uint32 }
+    }
+}
+`
+	p := parser.NewParser(content)
+	config, err := p.Parse()
+	if err != nil {
+		t.Fatalf("Parse failed: %v", err)
+	}
+
+	idx := index.NewProjectTree()
+	idx.AddFile("pragma.marte", config)
+	idx.ResolveReferences()
+
+	v := validator.NewValidator(idx, ".")
+	v.ValidateProject()
+	v.CheckUnused()
+
+	foundUnusedWarning := false
+	foundImplicitWarning := false
+
+	for _, d := range v.Diagnostics {
+		if strings.Contains(d.Message, "Unused Signal") && strings.Contains(d.Message, "UnusedSig") {
+			foundUnusedWarning = true
+		}
+		if strings.Contains(d.Message, "Implicitly Defined Signal") && strings.Contains(d.Message, "ImplicitSig") {
+			foundImplicitWarning = true
+		}
+	}
+
+	if foundUnusedWarning {
+		t.Error("Expected warning for UnusedSig to be suppressed")
+	}
+	if foundImplicitWarning {
+		t.Error("Expected warning for ImplicitSig to be suppressed")
+	}
+}
diff --git a/test/validator_signal_properties_test.go b/test/validator_signal_properties_test.go
new file mode 100644
index 0000000..42c954e
--- /dev/null
+++ b/test/validator_signal_properties_test.go
@@ -0,0 +1,108 @@
+package integration
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/marte-dev/marte-dev-tools/internal/index"
+	"github.com/marte-dev/marte-dev-tools/internal/parser"
+	"github.com/marte-dev/marte-dev-tools/internal/validator"
+)
+
+func TestSignalProperties(t *testing.T) {
+	content := `
++Data = {
+    Class = ReferenceContainer
+    +MyDS = {
+        Class = FileReader
+        Filename = "test"
+        Signals = {
+            Correct = { Type = uint32 NumberOfElements = 10 }
+        }
+    }
+}
+
++MyGAM = {
+    Class = IOGAM
+    InputSignals = {
+        // Correct reference
+        Correct = { DataSource = MyDS Type = uint32 NumberOfElements = 10 }
+        
+        // Mismatch Type
+        BadType = { 
+            Alias = Correct
+            DataSource = MyDS 
+            Type = float32 // Error
+        }
+        
+        // Mismatch Elements
+        BadElements = {
+            Alias = Correct
+            DataSource = MyDS
+            Type = uint32
+            NumberOfElements = 20 // Error
+        }
+        
+        // Valid Cast
+        //!cast(uint32, float32): Cast reason
+        CastSig = {
+            Alias = Correct
+            DataSource = MyDS
+            Type = float32 // OK
+        }
+        
+        // Invalid Cast (Wrong definition type in pragma)
+        //!cast(int32, float32): Wrong def type
+        BadCast = {
+            Alias = Correct
+            DataSource = MyDS
+            Type = float32 // Error because pragma mismatch
+        }
+    }
+}
+`
+	p := parser.NewParser(content)
+	config, err := p.Parse()
+	if err != nil {
+		t.Fatalf("Parse failed: %v", err)
+	}
+
+	idx := index.NewProjectTree()
+	idx.AddFile("signal_props.marte", config)
+	idx.ResolveReferences()
+
+	v := validator.NewValidator(idx, ".")
+	v.ValidateProject()
+
+	foundBadType := false
+	foundBadElements := false
+	foundBadCast := false
+
+	for _, d := range v.Diagnostics {
+		if strings.Contains(d.Message, "property 'Type' mismatch") {
+			if strings.Contains(d.Message, "'BadType'") {
+				foundBadType = true
+			}
+			if strings.Contains(d.Message, "'BadCast'") {
+				foundBadCast = true
+			}
+			if strings.Contains(d.Message, "'CastSig'") {
+				t.Error("Unexpected error for CastSig (should be suppressed by pragma)")
+			}
+		}
+
+		if strings.Contains(d.Message, "property 'NumberOfElements' mismatch") {
+			foundBadElements = true
+		}
+	}
+
+	if !foundBadType {
+		t.Error("Expected error for BadType")
+	}
+	if !foundBadElements {
+		t.Error("Expected error for BadElements")
+	}
+	if !foundBadCast {
+		t.Error("Expected error for BadCast (pragma mismatch)")
+	}
+}