Pull request description writer from the branch diff (English / Japanese)

What it does

Writes a pull request description from what the branch actually changes.

• The bundled script reads git diff base...HEAD and git log, and groups changed files by area with line counts
• Risk hints: database migrations, dependencies, config and infrastructure, CI, public API, auth code, deleted files, changes over 500 lines, SQL such as ALTER TABLE, removed exported functions
• Lists changed test files and warns when code changed without any test changes
• Adds a screenshot checklist only when UI files changed
• Prints a template in English or Japanese (summary, changes, testing, risks, rollout and rollback, screenshots, checklist) that the agent fills in after reading the diff

How to use

python scripts/pr_context.py --base main --lang en

Ask the agent to write the PR description for the current branch. Works with Claude, Codex, Hermes Agent and Cursor. It creates the PR (for example with gh pr create) only when you ask.

Requirements

• Python 3 (standard library only)
• Git

Caveats

• The script is read-only; it never pushes or creates pull requests.
• Risk flags are hints from file paths and a few line patterns; the final text is based on reading the diff.
• It never claims test results that were not actually run; unknown parts stay as comments.