Unclear When a session has its own directory, and so when the roots differ from the working directory, is not stated.
What
MCP servers are outside programs that give Claude Code extra tools. Claude Code tells each one which folders it may work in, a list called its roots. That list now starts from the current session's own directory when the session has one. When there is no such directory, it falls back to the working directory, which is the folder Claude Code was started in. Before, it always used the working directory.
Why
Where more than one session is running, an MCP server may now be told a different folder than before. If a server seems to be looking in an unexpected place, the session's directory is the place to check.
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When a session has its own directory, and so when the roots differ from the working directory, is not stated.