From cb7fca01b25a89dd3ec7e0ceb84e6fd938715dd2 Mon Sep 17 00:00:00 2001
From: "N. Taylor Mullen" <ntaylormullen@google.com>
Date: Mon, 9 Feb 2026 10:29:55 -0800
Subject: [PATCH] docs: add legacy snippets convention to GEMINI.md (#18597)

---
 GEMINI.md | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/GEMINI.md b/GEMINI.md
index 836454617e..734aa4eb64 100644
--- a/GEMINI.md
+++ b/GEMINI.md
@@ -52,6 +52,10 @@ powerful tool for developers.
 
 ## Development Conventions
 
+- **Legacy Snippets:** `packages/core/src/prompts/snippets.legacy.ts` is a
+  snapshot of an older system prompt. Avoid changing the prompting verbiage to
+  preserve its historical behavior; however, structural changes to ensure
+  compilation or simplify the code are permitted.
 - **Contributions:** Follow the process outlined in `CONTRIBUTING.md`. Requires
   signing the Google CLA.
 - **Pull Requests:** Keep PRs small, focused, and linked to an existing issue.