Add direct order for GitLab Duo to use merge request and MR as abbreviation rather than pull request or PR

Context

It's possible for Duo to refer to an MR as a PR. Example: gitlab-development-kit!4914 (comment 2544515642)

The changes in this MR look good. The PR removes documentation about [...]

Proposal

It sounds like we can do this in https://gitlab.com/gitlab-org/modelops/applied-ml/code-suggestions/ai-assist/-/blob/main/ai_gateway/prompts/definitions/review_merge_request/system/1.0.0.jinja by:

We can simply add another line with an direct order to always use merge request and MR as abbreviation and not pull request or PR.Take a look at the official claude system prompt how many per case / special topic remarks + instructions it has https://docs.anthropic.com/en/release-notes/system-prompts#may-22th-2025

Edited Sep 02, 2025 by 🤖 GitLab Bot 🤖