def unalias_tool(self, context_name, tool_name):
data = self._context(context_name)<EOL>aliases = data["<STR_LIT>"]<EOL>if tool_name in aliases:<EOL><INDENT>del aliases[tool_name]<EOL>self._flush_tools()<EOL><DEDENT>
Deregister an alias for a specific tool.

        Args:
            context_name (str): Context containing the tool.
            tool_name (str): Name of tool to unalias.