https://www.pistack.xyz/tags/rule-engines/ Recent content in Rule-Engines on Pi Stack Hugo en-us Sun, 27 Sep 2026 00:00:00 +0000 https://www.pistack.xyz/posts/2026-09-27-expression-languages-cel-go-expr-lang-jsonata-starlark-comparison/ Sun, 27 Sep 2026 00:00:00 +0000 https://www.pistack.xyz/posts/2026-09-27-expression-languages-cel-go-expr-lang-jsonata-starlark-comparison/ <p>The feature request always arrives the same way: <em>&ldquo;can we write our own filter rules without waiting for your release cycle?&rdquo;</em> You have two options. Either you build a plugin SDK that nobody adopts because it requires a compiler and a code review, or you embed an expression language and let users write <code>severity == 'critical' &amp;&amp; service in allowed_services</code>. The second option is a product decision with a security dimension, and the language you pick decides how much of that dimension you have to own.</p>