Update AI.md

AI.md

@@ -7,8 +7,12 @@
 
 ## Development - Contributions
 
-- [x] The project does accept contributions that were written with AI help, but the contribution must be attributed to a human username.
--- [x] The contribution should have come from a freely accessible open source model (coderabbitai pro which the project subscribes to is an exception).
+- [x] The project **does accept** contributions that were written with AI help. **However**:
+  - The contribution must be attributed to a human username who takes responsibility for the code as if they wrote it themselves. 
+  - AI often generates very unmaintainable code as it gets longer - loads of duplication, very little function re-use amd very poor at following style guides / idiomatic design. All code contributions (AI or not) are scrutinized hard for **maintainability** and **clean merging**. Please follow the CONTRIBUTORS guide. 
+  - AI that helps with short tab completion is generally fine.
+  - AI that writes lots of new code across lots of files, or makes lots of superfluous changes is generally less likely to be accepted.
+  - Vibe coding is not a suitable way to contribute to this project. 
 - [x] Contributors should declare when AI has been used to help write contributions.
 - [x] The project uses AI as an **optional** part of the PR process (coderabbitai). Please raise any concerns about usage within the PR.
 -- [x] Suggestions from coderabbitai can be accepted verbaitem, but ideally it should be the PR author that uses coderabbitai as a guide, who then re-writes the contribution.