---
title: "Discussion on \"What Your API Contract Doesn't Tell You: The Hidden Side Effects of Legacy Endpoints\" | Hashnode"
description: "Discussion on \"What Your API Contract Doesn't Tell You: The Hidden Side Effects of Legacy Endpoints\". Your shadow mode comparison only checks the part of the contract anyone wrote down."
url: "https://hashnode.com/posts/what-your-api-contract-doesn-t-tell-you-the-hidden-side-effects-of-legacy-endpoints/6a33c557131f901329931040"
---

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# [What Your API Contract Doesn't Tell You: The Hidden Side Effects of Legacy Endpoints](https://theimpactanalysis.hashnode.dev/what-your-api-contract-doesn-t-tell-you-the-hidden-side-effects-of-legacy-endpoints?utm_source=hashnode&utm_medium=feed)

Your shadow mode comparison only checks the part of the contract anyone wrote down.

Jun 18 · 11 min read · theimpactanalysis.hashnode.dev  
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## Written by

[Shlomo Friman](https://hashnode.com/@shlomofr)

@shlomofr · Austin, USA

  
[View profile](https://hashnode.com/@shlomofr)

Exploring the intersection of software archaeology and modern enterprise intelligence.

Founder & CEO of IN-COM Data Systems. I've been building software intelligence tools since 1997 — long enough to have a strong opinion about COBOL, mainframes, and why most enterprises still can't answer "what does this code actually do?"

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