driftfix

Dependabot bumps it. CI breaks. driftfix fixes the code.

Dependency bots open the upgrade PR, then leave you to fix whatever broke. driftfix finishes the job: it reads the failing tests, has Claude adapt your code to the new version, reruns your tests itself, and pushes the fix onto the same PR. If it can't get to green, it comments what it tried and commits nothing.

Dependabot PR (openai 0.28 → 1.x) → tests fail → Claude fixes code → tests rerun → ✅ commit on the PR
                                                                              └→ ❌ comment only

Benchmark

Real breaking upgrades, each a small app with tests that pass on the old version and fail on the new one (bench/):

7/7 fixed for $1.67 total, no test edits. The 6-file case runs with deprecation warnings as errors and includes a silent behavior change (v2 stops coercing numeric SKUs to strings). Rerun: python bench/run.py (or --check to validate cases for free). More cases welcome: add a folder under bench/cases/.

GitHub Action

# .github/workflows/driftfix.yml
name: driftfix
on: pull_request
permissions: { contents: write, pull-requests: write }
jobs:
  fix:
    if: github.actor == 'dependabot[bot]'
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with: { ref: "${{ github.head_ref }}" }
      - uses: Gthejesraj/driftfix@main
        with:
          anthropic-api-key: ${{ secrets.ANTHROPIC_API_KEY }}
          setup: pip install -r requirements.txt
          test: pytest -q

Important: workflows triggered by Dependabot can't read your normal repo secrets. Add ANTHROPIC_API_KEY under Settings → Secrets → Dependabot.

Commits pushed with the default GITHUB_TOKEN don't re-trigger CI. Use a PAT or GitHub App token in actions/checkout if you want CI to rerun on the fix.

CLI

pip install driftfix
# after upgrading a dependency and seeing tests fail:
driftfix fix --package openai --from 0.28 --to 1.40 --test "pytest -q"

Guardrails

• Your tests decide. driftfix reruns them after the agent finishes; the agent's word doesn't count.
• Changing the upgraded package's requirement (pinning back) or editing lock files is rejected. Adding a split-out package (e.g. pydantic-settings) is allowed.
• Requires a clean git tree, so every change is a reviewable diff.
• Never merges anything. The PR is still yours to review.
• The agent runs with full tool access inside the checkout. Run it in CI or a throwaway clone.

Roadmap

• More benchmark cases (pandas 2, Django, langchain), harder multi-file repos
• npm / Renovate support
• Provider mode: packages ship migration notes that driftfix reads

License

MIT