https://pythonflow.com/tags/pydantic/ Recent content in Pydantic on Pythonflow Hugo en-us alicandonmez90@gmail.com (flowfelis) alicandonmez90@gmail.com (flowfelis) Sun, 21 Jun 2026 07:00:00 +0100 https://pythonflow.com/posts/langbot-day-5-structured-output/ Sun, 21 Jun 2026 07:00:00 +0100alicandonmez90@gmail.com (flowfelis) https://pythonflow.com/posts/langbot-day-5-structured-output/ <p><strong>Recap:</strong> Yesterday we wired LangBot&rsquo;s prompt and model into one pipeline with LCEL&rsquo;s pipe operator — <code>chain = prompt | llm</code>. One <code>invoke()</code> call now handles everything from formatting to generation. But we still get back a raw <code>AIMessage</code> and have to reach into <code>.content</code> for the text. Today LangBot returns real typed objects.</p> <hr> <h2 id="the-problem-unstructured-mush">The problem: unstructured mush</h2> <p>Every LLM response so far has been an <code>AIMessage</code> — a blob of text with no shape. To extract anything useful, you either parse it yourself or pray the model followed your formatting instructions. Both are fragile.</p>