https://blog.veskovujovic.me/tags/data/ Recent content in Data on Chronicles of Data Enginenering https://blog.veskovujovic.me/general/floppy.jpg https://blog.veskovujovic.me/general/floppy.jpg Hugo en-us Tue, 02 Jun 2026 20:06:41 +0200 https://blog.veskovujovic.me/posts/from-json-to-toon/ Tue, 02 Jun 2026 20:06:41 +0200 https://blog.veskovujovic.me/posts/from-json-to-toon/ <p><img alt="toon cover" loading="lazy" src="https://blog.veskovujovic.me/posts/from-json-to-toon/toon-cover.png"></p> <p>Your agent makes a tool call. The tool returns <strong>40 rows of JSON.</strong> That JSON gets stuffed back into the model&rsquo;s context, the model thinks for a bit, calls another tool, gets another 40 rows back, and on it goes.</p> <p>By iteration 10, your prompt is mostly curly braces, quoted keys, and the same field names repeated hundreds of times.</p> <p>You&rsquo;re paying for every single one of those tokens. And you&rsquo;re paying for them on <em>every subsequent model call in the run</em>, because tool results stick around in the conversation history.</p>