3 sessions on python-pptx with a coding agent: the agent failed at least once in 2, and 1 finished without a human stepping in.
Takeaway: I'd start by asking for the duplication cleanup and the pyright strictness fix in the same pass, since touching sizing/renderer/verification together was always going to surface type issues in cli.py too.
Takeaway: Next time I'd open with 'use our clean-slides template and pptx CLI' from the start instead of letting it build a generic deck first and then redoing all the work.
Takeaway: Next time I'd start by asking the agent to validate any pptx it produces by actually opening it (via the PowerPoint MCP tool) rather than trusting raw XML surgery — the corrupted file cost the most time.