gitlab-mr-assign-reviewer

GitLab MR Assign Reviewer

Overview

Add the current user as a reviewer on a GitLab merge request without removing existing reviewers. The skill uses the GitLab CLI when GITLAB_TOKEN is not set and the REST API when the token is available.

When to Use

• The user asks to add themselves as a reviewer
• The user provides a merge request IID
• The user wants a review assignment without changing the rest of the reviewer list

Instructions

Inputs

$ARGUMENTS contains the merge request IID.

Step 1: Read the IID

Extract the merge request IID from $ARGUMENTS.

Step 2: Select the access path

Check whether GITLAB_TOKEN is set.

• If it is not set, use the GitLab CLI path.
• If it is set, use the REST API path.

Step 3: GitLab CLI path

Run:

glab mr update {iid} --reviewer @me

Step 4: REST API path

Require these environment variables and fail clearly if any are missing:

• GITLAB_HOST
• GITLAB_TOKEN

Determine the project path from git remote get-url origin, strip the host prefix and .git suffix, then URL-encode / as %2F.

Fetch the current user:

GET {GITLAB_HOST}/api/v4/user
Headers: PRIVATE-TOKEN: {GITLAB_TOKEN}

Extract the user id and username.

Fetch the merge request:

GET {GITLAB_HOST}/api/v4/projects/{encoded_project_path}/merge_requests/{iid}
Headers: PRIVATE-TOKEN: {GITLAB_TOKEN}

Extract the current reviewers. If the authenticated user is already a reviewer, stop and report that no change is needed.

Otherwise, append the user ID to the existing reviewer IDs and update the merge request:

PUT {GITLAB_HOST}/api/v4/projects/{encoded_project_path}/merge_requests/{iid}
Headers: PRIVATE-TOKEN: {GITLAB_TOKEN}
         Content-Type: application/json
Body: {"reviewer_ids": [{id1}, {id2}, ...]}

Output Format

Return a short confirmation such as Successfully added @username as reviewer on MR !42. On failure, include the HTTP status or CLI error output.

Examples

/gitlab-mr-assign-reviewer 42
add me as reviewer on MR 42
assign myself to merge request 105

Notes

• Preserve the existing reviewer list.
• Avoid duplicate reviewer IDs.
• Stop with a no-op message when the user is already assigned.