This tool lists all available source urls where an llms.txt can be fetched. After reading the listed sources, use fetch_llms_txt to fetch any source that matches a technology in the instructions you received. Prefer llms.txt, but if llms.txt proves inadequate, check to see if other llms-full.txt or llms-mini.txt exist. When done, ask the user if they want to use non-MCP tools to search for documentation on any sources this tool could not find.

该工具无需必填参数，直接调用即可

Fetches the content of one or more llms.txt urls. Some llms.txt files compile a list of urls to other llms.txt file locations because listing their full documentation would bloat context. If the documentation you re looking for does not exist in the llms.txt, look for reference links to other llms.txt files and follow those.

必填参数：input