diff --git a/AGENTS.md b/AGENTS.md
index 1a8677276..5e764065d 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -8,6 +8,7 @@
 
 ## Files to never commit
 - **NEVER** commit Eclipse settings files (`.settings/`, `.classpath`, `.project`). These are IDE-specific and must not be checked in. If `git status` shows changes to these files, revert them before committing.
+- **NEVER** commit the spine-cpp copies inside `spine-ue/` or `spine-godot/`. These are managed by setup scripts (`spine-ue/setup.sh`, `spine-godot/build/setup.sh`) and are gitignored. Only commit changes to the wrapper code in those runtimes, not the vendored spine-cpp sources.
 
 ## Git commit subject prefix (required)
 Every commit subject must start with a runtime prefix.