code: def unalias_tool(self, context_name, tool_name):
          
          data = self._context(context_name)
          aliases = data["tool_aliases"]
          if tool_name in aliases:
              del aliases[tool_name]
              self._flush_tools()
docs: Deregister an alias for a specific tool.
  
          Args:
              context_name (str): Context containing the tool.
              tool_name (str): Name of tool to unalias.