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Design for a new loop composite node that iterates until a break condition is met or max iterations is reached. Includes: - Do-while execution style - Parameter flow between iterations - Lineage tracking via separate branch logs per iteration - Argo compatibility via recursive templates Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Clarify that loop node branch parameter must always be a Pipeline, consistent with other composite nodes (parallel, map, conditional). Update SDK examples to wrap tasks in Pipeline objects. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Add loop placeholder constant following MAP_PLACEHOLDER pattern for iteration index replacement in loop node names
- Rename _resolve_map_placeholders to _resolve_iter_placeholders - Add support for LOOP_PLACEHOLDER resolution - Handle nested map and loop placeholders correctly - Keep old method for backward compatibility Co-Authored-By: Claude Sonnet 4 <noreply@anthropic.com>
- Create LoopNode class following composite node patterns - Use LOOP_PLACEHOLDER for branch name generation - Add validation for break_on and index_as parameters - Implement _get_iteration_branch_name using refactored placeholder resolution Co-Authored-By: Claude Sonnet 4 <noreply@anthropic.com>
- Add get_break_condition_value() method with proper validation - Add _create_iteration_branch_log() using placeholder resolution - Add _build_iteration_iter_variable() for iteration context - Proper error handling for missing/invalid parameters - Add comprehensive tests for all new methods Co-Authored-By: Claude Sonnet 4 <noreply@anthropic.com>
- Create branch logs for current iteration - Copy parameters from parent (iteration 0) or previous iteration - Use proper placeholder resolution for branch names - Support both initial and subsequent iterations Co-Authored-By: Claude Sonnet 4 <noreply@anthropic.com>
- Check break condition and max iterations correctly - Roll back parameters to parent on loop exit - Set final step status based on branch execution - Extract current iteration from iter_variable properly Co-Authored-By: Claude Sonnet 4 <noreply@anthropic.com>
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