# fastmod

> Claude/Codex skill by [@pydantic](https://omgskills.com/library/pydantic/index.md) · 8.9k stars · Updated 2026-11-08

Use fastmod to make mass code updates to avoid many repetitive changes.

## Install

```sh
git clone https://github.com/pydantic/monty /tmp/monty && ln -s /tmp/monty/.agents/skills/fastmod ~/.claude/skills/fastmod
```

## From README

fastmod Instructions You can occasionally use fastmod or sed to make mass updates to the codebase and avoid wasting tokens changing each case one at a time. Before making many repetitive changes to the codebase, consider using fastmod --accept-all. THINK HARD about how best to use fastmod as it can dramatically improve your productivity. Examples Example of switching the pytype function to take heap: &Heap instead of a generic H: HeapAccess parameter:

## Links

- HTML page: https://omgskills.com/library/pydantic/monty/dot-claude/skills/fastmod/
- GitHub: https://github.com/pydantic/monty
- Author: [@pydantic](https://omgskills.com/library/pydantic/index.md)

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