Describe the feature or problem you'd like to solve

Currently, GitHub MCP Server lacks the functionality to add reviewers to pull requests. Being able to directly assign reviewers through the API is essential for streamlining workflows.

Proposed solution

Implement functionality that corresponds to the GitHub API endpoint POST /repos/{owner}/{repo}/pulls/{pull_number}/requested_reviewers to allow adding reviewers to pull requests from the MCP server.

A suggested interface could look like:

{
  "owner": "repository_owner",
  "repo": "repository_name",
  "pull_number": pull_request_number,
  "reviewers": ["reviewer1", "reviewer2"]
}

Additional context

This feature would significantly enhance automation capabilities for development teams by allowing reviewer assignment to be part of CI/CD pipelines and team workflows. It would enable automatic assignment of domain experts based on code changes, balanced reviewer distribution across team members, and integration with custom review processes.