# Avoid Arbitrary Low-Level External Calls Arbitrary external calls are low-level calls where both the destination address and the call data—encompassing the function to be invoked and its parameters—can be manipulated. To bolster the security of your code, establish a firm rule against permitting completely arbitrary calls within your contracts. This precaution helps mitigate vulnerabilities, such as the risk of privilege escalation if the calling contract has special permissions in other contracts or the potential for draining tokens stored in the contract or misusing token approvals. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.optimumsec.xyz/coding/avoid-arbitrary-external-calls.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.