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* fix(todo-middleware): prevent premature agent exit with incomplete todos When plan mode is active (is_plan_mode=True), the agent occasionally exits the loop and outputs a final response while todo items are still incomplete. This happens because the routing edge only checks for tool_calls, not todo completion state. Fixes #2112 Add an after_model override to TodoMiddleware with @hook_config(can_jump_to=["model"]). When the model produces a response with no tool calls but there are still incomplete todos, the middleware injects a todo_completion_reminder HumanMessage and returns jump_to=model to force another model turn. A cap of 2 reminders prevents infinite loops when the agent cannot make further progress. Also adds _completion_reminder_count() helper and 14 new unit tests covering all edge cases of the new after_model / aafter_model logic. * Remove unnecessary blank line in test file * Fix runtime argument annotation in before_model * Apply suggestions from code review Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> --------- Co-authored-by: octo-patch <octo-patch@github.com> Co-authored-by: Willem Jiang <willem.jiang@gmail.com> Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>