github-pr-reviewer
Create an automation that reviews GitHub pull requests when they are opened or updated. Inspects the diff, changed files, tests, and existing discussion via GitHub MCP, then posts a concise review highlighting risks, security issues, missing tests, and next steps.
What this skill does
# GitHub PR Reviewer Automation
Set up a cron or event-triggered automation that reviews GitHub pull requests.
---
## Prerequisites
### Required integration
- **GitHub MCP** must be installed in Settings → MCP.
### Information to collect
Ask the user for:
1. **Repositories** — which repos should be watched (e.g. `myorg/backend`, `myorg/frontend`)
2. **Trigger type** — event-based (reacts to `pull_request.opened` / `pull_request.synchronize`) or cron-based polling
3. **Review tone** — thorough, concise, or friendly
4. **Auto-post or draft** — should reviews be posted as GitHub comments automatically, or saved as draft artifacts for human approval first?
5. **Filters** — any label, branch, or author filters (e.g. skip drafts, only review PRs with `needs-review` label)
---
## Setup Workflow
### Step 1 — Verify GitHub MCP access
Confirm the GitHub MCP integration is working:
```
Use the GitHub MCP to list recent pull requests in one of the target repositories.
```
If it fails, tell the user to install the GitHub MCP integration first.
### Step 2 — Determine trigger type
**Event-based (recommended if publicly reachable):**
Check `<RUNTIME_SERVICES>` for deployment reachability. If the deployment has a public URL, recommend an event trigger on `pull_request.opened` and `pull_request.synchronize`.
**Cron-based (local/private deployments):**
If the deployment is local, set up a cron schedule (e.g. every 5 minutes) that polls for recently updated PRs.
### Step 3 — Build the review prompt
Construct a prompt for the automation that includes:
- The user's chosen repositories
- Review focus areas (correctness, security, tests, maintainability)
- Review tone preference
- Whether to auto-post or draft
### Step 4 — Create the automation
Read the Automation backend URL and auth from `<RUNTIME_SERVICES>`:
- Use the **Automation backend** `url_from_agent` as `OPENHANDS_HOST`
- Auth: `X-Session-API-Key: $OPENHANDS_AUTOMATION_API_KEY`
Use the **prompt preset** endpoint:
```bash
curl -s -X POST "${OPENHANDS_HOST}/api/automation/v1/preset/prompt" \
-H "X-Session-API-Key: $OPENHANDS_AUTOMATION_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"name": "GitHub PR Reviewer",
"prompt": "<constructed review prompt>",
"trigger": <trigger config from step 2>
}'
```
### Step 5 — Confirm
Tell the user:
> ✅ **GitHub PR Reviewer** is running!
>
> - Automation ID: `{id}`
> - Repositories: `{repo list}`
> - Trigger: `{trigger description}`
> - Review style: `{tone}`, `{auto-post or draft}`
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