PR Feedback Classifier

Classify PR review feedback by filling in semantic fields from mechanical CLI output.

Steps

Run mechanical classification:
```
erk exec classify-pr-feedback [--pr <number>] [--include-resolved]
```
Pass --pr <number> if specified in $ARGUMENTS. Pass --include-resolved if specified in $ARGUMENTS.

This returns JSON with mechanically pre-classified items:
- review_submissions: PR-level reviews (classification: "actionable" | "informational" | "needs_llm")
- review_threads: Inline review threads (pre_existing_candidate flag set for bot + restructured)
- discussion_comments: Discussion comments (classification: "informational" | "needs_llm")
- restructured_files: Renamed/moved files detected by git diff
- mechanical_informational_count: Items already filtered as informational by CLI
Fill in semantic fields for items that need LLM judgment:

For each item:
- review_submissions with classification "needs_llm": Determine if actionable or informational
- All actionable items (review_submissions, review_threads, discussion_comments): Write action_summary (brief description of requested change)
- All actionable items: Assign complexity (local/single_file/cross_cutting/complex)
- Threads with pre_existing_candidate=true: Confirm if truly pre-existing (generic code quality issue, not specific to restructuring). If confirmed, set complexity to "pre_existing"
Construct final JSON output with batches grouped by complexity.

Complexity Levels

local: Single line change at specified location
single_file: Multiple changes in one file
cross_cutting: Changes across multiple files
complex: Architectural changes
pre_existing: Bot comment on moved/restructured code (auto-resolve candidate)

Batch Ordering

Pre-Existing (Auto-Resolve) (auto_proceed: true)
Local Fixes (auto_proceed: true)
Single-File (auto_proceed: true)
Cross-Cutting (auto_proceed: false)
Complex (auto_proceed: false)
Informational (auto_proceed: false)

Output Format

Output ONLY the following JSON (no prose, no markdown, no code fences):

{
  "success": true,
  "pr_number": 5944,
  "pr_title": "Feature: Add new API endpoint",
  "pr_url": "https://github.com/owner/repo/pull/5944",
  "actionable_threads": [
    {
      "thread_id": "PRR_kwDOPxC3hc5q73Nd",
      "type": "review_submission",
      "path": null,
      "line": null,
      "is_outdated": false,
      "classification": "actionable",
      "pre_existing": false,
      "action_summary": "Reviewer requested changes: fix the authentication flow",
      "complexity": "cross_cutting",
      "original_comment": "The authentication flow is broken for edge cases..."
    },
    {
      "thread_id": "PRRT_kwDOPxC3hc5q73Ne",
      "type": "review",
      "path": "src/api.py",
      "line": 42,
      "is_outdated": false,
      "classification": "actionable",
      "pre_existing": false,
      "action_summary": "Add integration tests for new endpoint",
      "complexity": "local",
      "original_comment": "This needs integration tests"
    },
    {
      "thread_id": "PRRT_kwDOPxC3hc5q73Nf",
      "type": "review",
      "path": "src/api.py",
      "line": 55,
      "is_outdated": false,
      "classification": "actionable",
      "pre_existing": true,
      "action_summary": "Bot suggestion: add unit tests for error handling paths",
      "complexity": "pre_existing",
      "original_comment": "Consider adding unit tests for the error handling paths in this endpoint"
    }
  ],
  "discussion_actions": [
    {
      "comment_id": 12345678,
      "action_summary": "Update API documentation",
      "complexity": "cross_cutting",
      "original_comment": "Please update the docs to reflect..."
    }
  ],
  "informational_count": 12,
  "batches": [
    {
      "name": "Pre-Existing (Auto-Resolve)",
      "complexity": "pre_existing",
      "auto_proceed": true,
      "item_indices": [1]
    },
    {
      "name": "Local Fixes",
      "complexity": "local",
      "auto_proceed": true,
      "item_indices": [0]
    },
    {
      "name": "Single-File",
      "complexity": "single_file",
      "auto_proceed": true,
      "item_indices": []
    },
    {
      "name": "Cross-Cutting",
      "complexity": "cross_cutting",
      "auto_proceed": false,
      "item_indices": []
    }
  ],
  "error": null
}

Field notes:

thread_id: The ID needed for erk exec resolve-review-thread
comment_id: The ID needed for erk exec reply-to-discussion-comment
type: "review" for inline thread comments, "review_submission" for PR-level review submissions, "discussion" for discussion actions
classification: "actionable" or "informational" — determines how the user handles the thread
pre_existing: true if the issue existed before this PR (bot comment on moved/restructured code). Pre-existing threads use complexity: "pre_existing" and are placed in the first batch for auto-resolution
item_indices: References into actionable_threads (type=review or review_submission) or discussion_actions (type=discussion)
original_comment: First 200 characters of the comment text
informational_count: Count of informational items — includes items filtered by CLI plus any you classify as informational

Error Case

If no PR exists for the branch or API fails:

{
  "success": false,
  "pr_number": null,
  "pr_title": null,
  "pr_url": null,
  "actionable_threads": [],
  "discussion_actions": [],
  "informational_count": 0,
  "batches": [],
  "error": "No PR found for branch feature-xyz"
}

No Comments Case

If PR exists but has no unresolved comments:

{
  "success": true,
  "pr_number": 5944,
  "pr_title": "Feature: Add new API endpoint",
  "pr_url": "https://github.com/owner/repo/pull/5944",
  "actionable_threads": [],
  "discussion_actions": [],
  "informational_count": 0,
  "batches": [],
  "error": null
}