"""MCP tool stubs for analysis checkpointing and rollback.

These are placeholders for the future checkpoint system that will
allow saving and restoring analysis state during exploratory work.
"""

from __future__ import annotations


def dante_checkpoint(name: str) -> str:
    """Save a named checkpoint of the current analysis state.

    Args:
        name: A descriptive name for this checkpoint.

    Returns:
        Confirmation message.
    """
    # TODO: implement checkpoint persistence
    return (
        "_Checkpointing is not yet implemented._ "
        "This feature will save snapshots of analysis state "
        "for later restoration."
    )


def dante_rollback(name: str) -> str:
    """Roll back to a previously saved checkpoint.

    Args:
        name: The checkpoint name to restore.

    Returns:
        Confirmation message or error if checkpoint not found.
    """
    # TODO: implement rollback from checkpoint store
    return (
        "_Rollback is not yet implemented._ "
        "This feature will restore a previously saved analysis checkpoint."
    )
