def unhide_tool(self, context_name, tool_name):
data = self._context(context_name)<EOL>hidden_tools = data["<STR_LIT>"]<EOL>if tool_name in hidden_tools:<EOL><INDENT>hidden_tools.remove(tool_name)<EOL>self._flush_tools()<EOL><DEDENT>
Unhide a tool so that it may be exposed in a suite.

        Note that unhiding a tool doesn't guarantee it can be seen - a tool of
        the same name from a different context may be overriding it.

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