sketchy remove

mcp/shared.ts

@@ -65,9 +65,36 @@ export const tool = <const params>(toolDef: Tool<any, StandardSchemaV1<params>>)
   return toolDef;
 };
 
+// recursively remove $schema fields from JSON Schema objects
+function removeSchemaFields(obj: any): any {
+  if (obj === null || typeof obj !== "object") {
+    return obj;
+  }
+
+  if (Array.isArray(obj)) {
+    return obj.map(removeSchemaFields);
+  }
+
+  const result: any = {};
+  for (const [key, value] of Object.entries(obj)) {
+    // skip $schema fields
+    if (key === "$schema") {
+      continue;
+    }
+    result[key] = removeSchemaFields(value);
+  }
+
+  return result;
+}
+
 export const addTools = (server: FastMCP, tools: Tool<any, any>[]) => {
   for (const tool of tools) {
-    server.addTool(tool);
+    // clone tool and remove $schema from parameters schema
+    const cleanedTool = {
+      ...tool,
+      parameters: tool.parameters ? removeSchemaFields(tool.parameters) : undefined,
+    };
+    server.addTool(cleanedTool);
   }
   return server;
 };