diff --git a/cmd/analyze/cleanable.go b/cmd/analyze/cleanable.go
index c74f7c7..b7ecae0 100644
--- a/cmd/analyze/cleanable.go
+++ b/cmd/analyze/cleanable.go
@@ -105,6 +105,7 @@ var projectDependencyDirs = map[string]bool{
 	"Pods":        true,
 	".build":      true,
 	"Carthage":    true,
+	".dart_tool":  true,
 
 	// Other tools
 	".terraform": true, // Terraform plugins
diff --git a/cmd/analyze/constants.go b/cmd/analyze/constants.go
index b38e8de..cc65417 100644
--- a/cmd/analyze/constants.go
+++ b/cmd/analyze/constants.go
@@ -138,6 +138,7 @@ var foldDirs = map[string]bool{
 	".build":      true,
 	"xcuserdata":  true,
 	"Carthage":    true,
+	".dart_tool":  true,
 
 	// Web frameworks
 	".angular":    true,
diff --git a/lib/clean/project.sh b/lib/clean/project.sh
index ee67baa..5763c2c 100644
--- a/lib/clean/project.sh
+++ b/lib/clean/project.sh
@@ -21,6 +21,7 @@ readonly PURGE_TARGETS=(
     "obj"           # C# / Unity
     ".turbo"        # Turborepo cache
     ".parcel-cache" # Parcel bundler
+    ".dart_tool"    # Flutter/Dart build cache
 )
 
 # Minimum age in days before considering for cleanup