diff --git a/crates/zclaw-runtime/src/tool/builtin/path_validator.rs b/crates/zclaw-runtime/src/tool/builtin/path_validator.rs
index 35f809f..80e93fe 100644
--- a/crates/zclaw-runtime/src/tool/builtin/path_validator.rs
+++ b/crates/zclaw-runtime/src/tool/builtin/path_validator.rs
@@ -230,7 +230,14 @@ impl PathValidator {
     fn resolve_and_validate(&self, path: &str) -> Result<PathBuf> {
         // Expand tilde
         let expanded = expand_tilde(path);
-        let path_buf = PathBuf::from(&expanded);
+        let mut path_buf = PathBuf::from(&expanded);
+
+        // If relative path and workspace is configured, resolve against workspace
+        if path_buf.is_relative() {
+            if let Some(ref workspace) = self.workspace_root {
+                path_buf = workspace.join(&path_buf);
+            }
+        }
 
         // Check for path traversal
         self.check_path_traversal(&path_buf)?;