Basic Examples

Patchling everywhere: this library also ships for browser and Node as patchling — see it running live in nanoodle.com, a no-server visual AI workflow editor built on it.

Single-File Refactor

# Before: utils.py
def process_data(input):
    result = []
    for item in input:
        result.append(item*2)
    return result

patchling "Convert loop to list comprehension" utils.py --apply

# After: utils.py
def process_data(input):
    return [item*2 for item in input]

Multi-File Rename

patchling "Rename UserController to AccountController" \
    app/controllers/user_controller.py \
    test/controllers/test_user_controller.py \
    docs/api.md --apply

Full-Stack Type Safety

patchling "Add Python type hints throughout codebase" \
    --model deepseek-reasoner \
    --temperature 0.3 \
    --apply

Legacy Modernization

patchling "Convert string formatting to f-strings" src/ --apply

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Ready for More?

These examples show what Patchling can do with a single command. But the real power comes from running it continuously.

while true; do
  patchling "Improve code quality" --apply
  sleep 5
done

Let Patchling work on your codebase while you sleep. Each cycle finds the next improvement, applies it, and continues—test coverage expands, tech debt shrinks, security hardens automatically.

See Agent Loops Guide → for ready-to-use automation recipes.