Engineering
github · pull_request.openedPull request reviewer
Reviews every pull request against your conventions and leaves inline comments only where it found something concrete.
5,000 free credits to start.
The prompt
The workflow prompt
Copy this prompt into a new workflow, connect the listed integrations, and configure its trigger.
When a pull request is opened or updated against main, read the full diff.Read CONTRIBUTING.md and the last twenty merged pull request reviews so you know what this team cares about.Check out the code and run the linter and the type checker.Leave a review with inline comments only where you found something concrete.An unhandled error path, a duplicated helper, a missing test for a new branch, a migration that is not backward compatible.Skip style nits the formatter already handles.If the change looks good, approve it with a one line summary.Post a link to your review in #eng and tag the author.
Trigger
What starts this workflow
Runs when the event fires in the connected service. Filters keep the workflow on the events you want. Event triggers are available for GitHub, Slack, and Plain.
Example output
What you get back
Every run keeps its full transcript. The steps the agent took, each tool call, and the result.
Review posted on PR #2841
- Flagged an unhandled error path in `sync.ts:142`
- Suggested reusing `parseCursor` instead of a second parser
- Confirmed the migration is backward compatible
New to Helios? Start with Run your first workflow.
Use cases
The task behind this template
Engineering
Pull request review
A workflow reads each diff against your conventions and leaves a real review. A second workflow on a schedule posts the week's merged work, review backlog, and CI health.
Engineering
Incident summaries
A workflow rebuilds the timeline from your incident channel and the deploys around it. It names the likely change and drafts the write-up with the facts in place.
Guides
Set it up step by step
12 min
React to GitHub events
Start a run the moment a pull request opens, a build finishes, or a tag lands. Filter down to exactly the events you want.
10 min
Attach an MCP server
Point Helios at a remote MCP server, choose which of its tools workflows may call, and use Helios itself over MCP from other clients.
7 min
Pin repositories as context
Pin a GitHub repository to a workflow or a chat. The agent starts every run with it.
Related templates
Pair it with these
Engineering
Standup without the meeting
Reads yesterday's commits, merges, and review queue, then posts a standup to Slack every weekday morning.
Engineering
Release notes writer
Turns a new tag into release notes grouped by theme, publishes a draft release on GitHub, and files a changelog entry in Notion.
Engineering
Incident postmortem drafter
Rebuilds the incident timeline from Slack and GitHub, names the likely change, and drafts the write-up in Notion.
Run Pull request reviewer on your tools.
Connect the integrations, paste the prompt, and pick the trigger.