# Fastmod

> Use fastmod to make mass code updates to avoid many repetitive changes. Use when this capability is needed.

- Skill: `tomevault-io/fastmod` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add tomevault-io/fastmod`
- Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/fastmod/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: tomevault-io (https://skillmd.com/u/tomevault-io)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/tomevault-io/fastmod

---


# 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 `py_type` function to use `impl ResourceTracker` instead of `T: ResourceTracker`:

```bash
fastmod --accept-all 'fn py_type<T: ResourceTracker>(\(.+?)<T>' 'fn py_type$1<impl ResourceTracker>'
```

---
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<!-- tomevault:4.0:skill_md:2026-04-11 -->