fix(mcp): propagate internal serialization errors instead of silently swallowing them to prevent LLM hallucination

server/src/handlers/workspaces.rs

@@ -185,7 +185,10 @@ impl McpTool for DeleteSnippetHandler {
             drop(idx.delete_document(&req.name));
             Ok("Snippet deleted.".to_string())
         } else {
-            Err("Snippet not found. Please verify the snippet ID using search_snippets.".to_string())
+            Err(
+                "Snippet not found. Please verify the snippet ID using search_snippets."
+                    .to_string(),
+            )
         }
     }
 }
@@ -270,7 +273,10 @@ impl McpTool for ListContextWorkspacesHandler {
         let req: ListContextWorkspacesTool =
             serde_json::from_value(args).map_err(|e| e.to_string())?;
         let data = state.context_workspaces.read_with(|ws| {
-            let filtered: Vec<_> = ws.iter().filter(|w| req.namespace.as_ref().map_or(true, |ns| &w.namespace == ns)).collect();
+            let filtered: Vec<_> = ws
+                .iter()
+                .filter(|w| req.namespace.as_ref().map_or(true, |ns| &w.namespace == ns))
+                .collect();
             serde_json::to_string(&filtered).map_err(|e| e.to_string())
         })?;
         Ok(data)
@@ -295,10 +301,13 @@ impl McpTool for DeleteContextWorkspaceHandler {
     async fn execute(&self, args: Value, state: Arc<MemoryState>) -> Result<String, String> {
         let req: crate::tools::DeleteContextWorkspaceTool =
             serde_json::from_value(args).map_err(|e| e.to_string())?;
-        
+
         let mut found = false;
         state.context_workspaces.modify(|ws| {
-            if let Some(pos) = ws.iter().position(|w| w.namespace == req.namespace && w.name == req.name) {
+            if let Some(pos) = ws
+                .iter()
+                .position(|w| w.namespace == req.namespace && w.name == req.name)
+            {
                 ws.remove(pos);
                 found = true;
             }