Week 45, updated 2 Nov 2026

AI use cases Coding agents AI refactoring and code migrations

AI refactoring and code migrations

Let an AI agent do mechanical refactors and framework or API migrations in small, reviewable steps. Prompts, a safe workflow and the best-scored tools.

Tools compared
4
Open source
3of 4
Reviewed
16 Oct

For: Developers

Best-scored tools for this jobscore, safety
  1. 1OpenHandsAgent framework68Caution
  2. 2Claude CodeAI tool65No dependencies scanned
  3. 3ClineAI tool65Caution
  4. 4AiderAI tool31Caution
What the score and shapes mean

Score = public maintenance, adoption and docs signals, as a percentile of 52 tools. Nobody here tested these hands-on. Shapes are the separate safety label: No issues found, No dependencies scanned, Caution.

What it does for you

Developers maintaining an existing codebase, especially one with a reasonable test suite.

  • Rename symbols and update every call site
  • Move code between modules and fix the imports
  • Migrate from one library or API version to another, file by file
  • Convert code between languages or styles where tests exist
  • Remove dead code and duplicated helpers
More about this job

Renaming, extracting functions, moving to a new API or upgrading a library involves many repetitive edits. Agents are good at applying one pattern consistently, as long as tests tell you whether behaviour changed.

Workflow in 5 steps

  1. Make sure the tests pass before you start.
  2. Write down the exact rule of the change.
  3. Ask the agent for an inventory first, then migrate one directory at a time.
  4. Run tests and the type checker after each batch and commit each batch separately.
  5. Review a sample of the changes by hand, especially the exceptions.
Full steps
  1. Make sure the tests pass before you start; that is your safety net.
  2. Write down the exact rule of the change (old pattern, new pattern, exceptions).
  3. Ask the agent for an inventory first, then migrate one directory at a time.
  4. Run tests and the type checker after each batch and commit each batch separately.
  5. Review a sample of the changes by hand, especially the exceptions.

Prompts to copy

Starting points we wrote, not tested results.

Migrate the module src/payments from the old client API to the new one described in MIGRATION.md. Change one file at a time and run the tests after each.

2 more prompts

Extract the duplicated retry logic in these three files into one helper with the same behaviour. Show me the diff before applying.

List every place that still calls the deprecated function oldFetch(), grouped by directory, without editing anything.

Watch out for

  • Treat AI changes like a pull request from a new colleague: read the diff, run the tests and keep a human sign-off before anything ships.
  • Agents that can run commands can delete or overwrite files.
  • AI output can be fluent and wrong.
  • Without tests an agent can change behaviour silently.
  • Licence to check before commercial use: Claude Code (Proprietary (Anthropic Commercial Terms)).
  • CautionOpenHandsSkill/agent file instructs piping a remote script into a shell: .agents/skills/frontend-development/references/guide.md
  • No dependencies scannedClaude CodeCode checks clean, no lockfile to check
  • CautionCline13 critical-severity known vulnerabilities in runtime dependencies (OSV)
  • CautionAider18 critical-severity known vulnerabilities in runtime dependencies (OSV)
Why these warnings?
  • Treat AI changes like a pull request from a new colleague: read the diff, run the tests and keep a human sign-off before anything ships.
  • Agents that can run commands can delete or overwrite files. Work in a branch or sandbox, commit first, and approve destructive commands by hand.
  • AI output can be fluent and wrong. Check facts, code and citations yourself before you rely on them or publish them.
  • Without tests an agent can change behaviour silently. Add characterization tests first if there are none.
  • OpenHands: Skill/agent file instructs piping a remote script into a shell: .agents/skills/frontend-development/references/guide.md — curl -LsSf https://astral.sh/uv/install.sh | sh
  • Claude Code: code and instruction-file checks found nothing, but there is no runtime lockfile or manifest, so dependencies were not checked
  • Cline: 13 critical-severity known vulnerabilities in runtime dependencies (OSV)
  • Aider: 18 critical-severity known vulnerabilities in runtime dependencies (OSV)

Recommended tools

From our ranked data, highest score first. A high score does not mean a clean scan.

  • 68OpenHandsAgent framework · MIT · #10 overall
  • 65Claude CodeAI tool · Proprietary (Anthropic Commercial Terms) · #11 overall
  • 65ClineAI tool · Apache-2.0 · #12 overall
  • 31AiderAI tool · Apache-2.0 · #45 overall

Related jobs

Sources for tool facts

OpenHands/OpenHands · anthropics/claude-code · cline/cline · Aider-AI/aider. Data fetched 2 Nov 2026. Scores and labels are automated, relative and not a hands-on test.

Get the board every Monday

One email a week: the new top 10, the biggest score changes and every safety label that changed.

Free. Double opt-in: you confirm by email first, unsubscribe in one click.