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[Feature]: Post Pull Request Summary as a GitHub Comment #3

@xueyulinn

Description

@xueyulinn

Problem

The backend can receive GitHub pull request webhooks, but it does not yet generate or publish a pull request summary. As a result, there is no automated way to provide a quick overview of PR changes directly in the discussion
thread.

Proposed Solution

Add support for generating a summary for a pull request and posting that summary as a GitHub comment.

Initial scope:

  • Handle relevant pull_request webhook events
  • Extract the PR context needed for summarization
  • Generate a concise PR summary
  • Post the summary to the PR as a comment using the GitHub Issue Comments API
  • Add basic logging, error handling, and tests for the comment-posting flow

A reasonable rollout would be:

  • Phase 1: Post a simple deterministic summary or placeholder summary to verify the end-to-end flow
  • Phase 2: Improve the summary quality and formatting
  • Phase 3: Introduce agent-generated summaries after the GitHub integration is stable

Use Case

When a relevant GitHub event is received, the service should be able to post a comment back to the associated pull request or issue. This confirms that:

  • the webhook payload is parsed correctly
  • authentication is configured correctly
  • outbound GitHub API calls work as expected
  • the system is ready for future agent-generated comments

Expected User Experience

When a pull request is opened or updated, the system should automatically publish a comment that summarizes the PR. This helps reviewers quickly understand the scope and intent of the change without manually scanning the full diff first.

Alternatives Considered

  • Do not post a summary comment and rely only on the PR description
    This depends on the author providing a complete and consistent summary.
  • Introduce agent-generated summaries immediately
    This would increase implementation and debugging complexity before the GitHub comment pipeline is proven.
  • Use PR review comments instead of a top-level PR comment
    This is less suitable for a high-level summary and is better for line-specific feedback.

Priority

High

Additional Context

This feature should focus on pull request summaries only. The primary goal is to build a reliable flow from webhook reception to summary comment publication. Once that flow is stable, the summary generation logic can be improved or delegated to an agent.

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