Generate PR Description

You are tasked with generating a comprehensive pull request description following the repository's standard template.

Steps to follow:

1. Read the PR description template:
   • Check if .github/PULL_REQUEST_TEMPLATE.md exists (standard GitHub location)
   • If it doesn't exist, use a standard PR template with Summary, Changes, Test Plan, and Checklist sections
   • Read the template carefully to understand all sections and requirements
2. Identify the PR to describe:
   • Check if the current branch has an associated PR: tracker pr-current --json url,number,title,state 2>/dev/null
   • If no PR exists for the current branch, or if on main/master, list open PRs: tracker pr-list-open
   • Ask the user which PR they want to describe
3. Check for existing description:
   • Check if flow/prs/{number}_description.md already exists
   • If it exists, read it and inform the user you'll be updating it
   • Consider what has changed since the last description was written
4. Gather comprehensive PR information:
   • Get the full PR diff: tracker pr-diff {number}
   • On GitHub: if you get an error about no default remote repository, instruct the user to run gh repo set-default and select the appropriate repository
   • Get commit history: tracker pr-view {number} --json commits
   • Review the base branch: tracker pr-view {number} --json baseRefName
   • Get PR metadata: tracker pr-view {number} --json url,title,number,state
5. Analyze the changes thoroughly: (ultrathink about the code changes, their architectural implications, and potential impacts)
   • Read through the entire diff carefully
   • For context, read any files that are referenced but not shown in the diff
   • Understand the purpose and impact of each change
   • Identify user-facing changes vs internal implementation details
   • Look for breaking changes or migration requirements
6. Handle verification requirements:
   • Look for any checklist items in the template
   • For each verification step:
     • If it's a command you can run (like uv run pytest, npm test, etc.), run it
     • If it passes, mark the checkbox as checked: - [x]
     • If it fails, keep it unchecked and note what failed: - [ ] with explanation
     • If it requires manual testing (UI interactions, external services), leave unchecked and note for user
   • Document any verification steps you couldn't complete
7. Generate the description:
   • Fill out each section from the template thoroughly:
     • Answer each question/section based on your analysis
     • Be specific about problems solved and changes made
     • Focus on user impact where relevant
     • Include technical details in appropriate sections
   • Ensure all checklist items are addressed (checked or explained)
8. Save the description:
   • Write the completed description to flow/prs/{number}_description.md
   • Show the user the generated description
9. Update the PR:
   • Update the PR description directly: tracker pr-edit-body {number} flow/prs/{number}_description.md
   • Confirm the update was successful
   • If any verification steps remain unchecked, remind the user to complete them before merging
10. Transition linked work-item states (if PR is linked to issues / work items):
    • Get linked work-item ids: tracker pr-closing-issues {number}
    • For each linked work item: tracker set-state <id> pr-submitted in-progress

Important notes:

• This command works across different repositories - always read the local template
• Be thorough but concise - descriptions should be scannable
• Focus on the "why" as much as the "what"
• Include any breaking changes or migration notes prominently
• If the PR touches multiple components, organize the description accordingly
• Always attempt to run verification commands when possible
• Clearly communicate which verification steps need manual testing