Used Codex's tool use to auto-generate actual .pptx / .docx / .xlsx files — not just content, the real files

Reddit r/AI_Agents Tools
codex tool-use document-generation office-automation ai-agent openai microsoft-office

Summary

The author describes using OpenAI's Codex model to generate actual Office files (.pptx, .docx, .xlsx) directly via function calls, resulting in a useful end-to-end document generation pattern for AI agents.

Been messing around with giving Codex tools that write Office files directly instead of just returning text. Took a while to get the function calls structured right but once it worked it felt like one of those "why wasn't I doing this already" moments. The agent handles the whole thing end to end — you describe what you want, it figures out the structure, calls the right functions, outputs a file you can actually open. Nothing groundbreaking architecturally but a genuinely useful pattern if you're building anything that involves document output. Full walkthrough in the comments.
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@vintcessun: VibeOfficing is bound to take off. OfficeDex lets you generate native .docx/.pptx/.xlsx files directly from natural language — no need to go through HTML first or tweak formatting manually. Its design isn't a single-prompt file generator; instead, multiple agents divide the work — one defines the outline, one writes the content, one handles layout, and it remembers your past style. Plus, with built-in preview, you don't need Office installed — great for teams that produce weekly reports.

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OfficeDex is the first AI-native VibeOfficing platform that generates native .docx/.pptx/.xlsx files directly from natural language, using multiple agents for structure, content, and formatting, with memory and built-in preview.