## Context
Q&A: how to set default argument values (maxResults, includeRawContent, etc.) when using the Tavily MCP server, the way the LangChain TavilySearch wrapper allows.
## Verified resolution
Contributor pulvedu: this is a broader MCP-protocol limitation; the team was considering letting users pass default args through env vars at MCP configuration time, and later noted 'Releasing support soon'. Lesson: MCP tool defaults are not per-call configurable in older versions - check whether the installed version supports default args via env.