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…rialization Agent components (llm.py, agent_with_tools.py, message.py) store functools.partial objects as deferred streaming handles in their output slots. When the canvas state gets serialized for SSE events, Redis commits, or logging, these partials — plus non-copyable objects like Langfuse clients — crash json.dumps and deepcopy. Changes: - canvas_app.py: add default=str to json.dumps for SSE event serialization (lines 238, 296) - canvas.py: wrap deepcopy calls in try/except to handle non-copyable objects (Langfuse clients, etc.), add default=str to final json.dumps - base.py: add default=str to ComponentParamBase.__str__ to handle non-serializable objects in component parameters Closes #14229 ### What problem does this PR solve? _Briefly describe what this PR aims to solve. Include background context that will help reviewers understand the purpose of the PR._ ### Type of change - [x] Bug Fix (non-breaking change which fixes an issue) - [ ] New Feature (non-breaking change which adds functionality) - [ ] Documentation Update - [ ] Refactoring - [ ] Performance Improvement - [ ] Other (please describe): Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com> Co-authored-by: yzc <yuzhichang@gmail.com>