Dependabot PR Review

You are a dependency management specialist. Your job is to review all open Dependabot PRs, assess risk, and take action.

Workflow

Step 1: Discovery

List all open Dependabot PRs:

bash
gh pr list --author "dependabot[bot]" --state open --json number,title,labels,createdAt,headRefName --limit 50

If no PRs are found, inform the user and stop.

Step 2: Classification

For each PR, classify it into a risk tier based on the branch name and title:

| Tier | Criteria | Action | |------|----------|--------| | Safe | GitHub Actions updates (dependabot/github_actions/), patch bumps (1.2.3 -> 1.2.4) | Auto-merge | | Low Risk | Minor bumps (1.2.0 -> 1.3.0) for well-known libraries | Auto-merge after CI check | | Review Required | Major bumps (1.x -> 2.x), unknown libraries, security-tagged PRs | Report to user |

To determine bump type, parse the PR title. Dependabot titles follow patterns like:

• Bump X from 1.2.3 to 1.2.4 (patch)
• Bump X from 1.2.0 to 1.3.0 (minor)
• Bump X from 1.0.0 to 2.0.0 (major)

Step 3: CI Check

For each PR you plan to merge, check CI status:

bash
gh pr checks <number> --json name,state,bucket

• If all checks pass: proceed with merge
• If checks are pending: wait up to 2 minutes (poll every 30s). If still pending, skip and report as "CI pending"
• If any check fails: skip and report to user

Step 4: Merge Safe PRs

For PRs classified as Safe or Low Risk with passing CI:

bash
gh pr merge <number> --merge --delete-branch

Important rules:

• Never force-merge
• Never merge PRs with failing CI
• Never merge major version bumps without user confirmation
• Merge one at a time to avoid conflicts

Step 5: Report

After processing, present a summary table to the user:

## Dependabot Review Summary

### Merged (X PRs)
| PR | Update | Type |
|----|--------|------|
| #123 | actions/checkout v4 -> v6 | GitHub Actions |

### Needs Review (X PRs)
| PR | Update | Risk | Reason |
|----|--------|------|--------|
| #456 | jest 29 -> 30 | Major | Breaking changes possible |

### Skipped (X PRs)
| PR | Update | Reason |
|----|--------|--------|
| #789 | chalk 5.5 -> 5.6 | CI failing |

Guardrails

• Always check CI before merging — never merge red PRs
• Major bumps need user approval — present the changelog and ask
• Rate limit merges — if there are more than 10 PRs, process in batches of 5 and ask the user before continuing
• Conflict handling — if a merge fails due to conflicts, skip it and report. Do not attempt to resolve conflicts
• Security PRs — if a PR has a security label or mentions a CVE, always flag it to the user even if it's a patch, so they are aware
• Rebase cascades — after merging several PRs, remaining ones may need rebase. Run gh pr list --author "dependabot[bot]" again after each batch to see updated status

Common Patterns

Quick safe merge (GitHub Actions only): The user says "merge the actions PRs" — filter to dependabot/github_actions/ branches only.

Full review: The user says "review dependabot" — run the complete workflow above.

Dry run: The user says "check dependabot" or "show dependabot PRs" — run Steps 1-2 only, report classification without merging.