Datasets:
v2.19: ensure every tool def has a 'parameters' field (Lena follow-up). Cross-session lookup now prefers variants WITH parameters; final pass adds empty `{type:object, properties:{}}` for tools that genuinely have no args (e.g., 'finish') where no sibling captured a real schema. ~1.99M tool defs upgraded. Regression suite now checks this.
3968af0 verified