The provided MCP server description contains several tools that rely on the Exa AI API. All tools require an _EXA_API_KEY as input. While the tools themselves don't exhibit direct tool poisoning or shadowing vulnerabilities, the reliance on a single API key across all tools introduces a potential security risk. If the _EXA_API_KEY is compromised, all tools become vulnerable. However, since the API key is explicitly required as input and there are no hidden instructions, the severity is low.