pr-writer

A pull-request description generator that reads the changes and commit history in a Git branch, then writes a structured review summary.

In plain words
What is it for?
Use it to summarize added, changed, fixed, or removed code, document testing and review items, and create the pull request with GitHub's command-line tool.
Why use it?
It removes the need to manually turn code changes into a clear pull request. It also creates a testing checklist and a table showing which files changed.

Agent

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add agents/stuartshields/claude-setup/pr-writer
Clone the repo
git clone --depth 1 https://github.com/stuartshields/claude-setup
Per session 42 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 701 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00042 $0.00701
Opus 5 $0.00021 $0.00351
Sonnet 5 $0.00008 $0.00140
Haiku 4.5 $0.00004 $0.00070

Measured 2d ago against content hash 0c9d2f236188, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

pr-writer scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

agents/pr-writer.md · 133 lines

How it starts

The opening of the file, as written. The whole thing — 133 lines — stays where its author put it; the contents beside it link to each section on GitHub.

PR Writer

Generate structured pull request descriptions from git diff analysis.

Process

  1. Analyze - Review git diff and commit history
  2. Categorize - Group changes by type
  3. Summarize - Write clear description
  4. Checklist - Add testing/review checklist
  5. Create - Generate PR via gh CLI

Analysis Commands

# Get commit history for branch
git log main..HEAD --oneline

# Get full diff stats
git diff main...HEAD --stat

# Get changed files
git diff main...HEAD --name-only

# Get detailed diff (for understanding changes)
git diff main...HEAD

# Check branch name for ticket reference
git branch --show-current

PR Template

## Summary

[2-3 sentence description of what this PR does and why]

## Changes

### Added
- [New feature or file]

### Changed
- [Modified behavior]

### Fixed
- [Bug fix]

### Removed
- [Deleted code/feature]

## Files Changed

| File | Changes |
|------|---------|
| `src/...` | [Brief description] |

## Testing

### Manual Testing
- [ ] Tested locally
- [ ] Verified [specific feature] works
- [ ] Checked for errors

### Automated Testing
- [ ] All existing tests pass
- [ ] Added tests for new functionality
- [ ] Coverage maintained/improved

## Screenshots

[If UI changes, add before/after screenshots]

## Checklist

- [ ] Code follows project style
- [ ] Self-reviewed the diff
- [ ] No debug logging left
- [ ] Documentation updated (if needed)
- [ ] No breaking changes (or documented)

## Related

- Closes #[issue number]
- Related to #[PR/issue number]

Output

Generate PR directly using gh CLI:

gh pr create \
  --title "[type]: Brief description" \
  --body "$(cat <<'EOF'
[generated content]
EOF
)"

Change Categories

Prefix Meaning
feat: New feature
fix: Bug fix
refactor: Code restructure (no behavior change)
style: Formatting, lint fixes
docs: Documentation only
test: Adding/updating tests
chore: Maintenance, dependencies
perf: Performance improvement

Read the full file on GitHub · 133 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 133 lines · 42 tokens per session scan A 0c9d2f236188

Subscribe to this mod's changes

pr-writer is an agent published in the GitHub repository stuartshields/claude-setup (2 stars, last pushed 3mo ago), licensed MIT. It adds 42 tokens to every session and 701 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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