# Auto Format On Edit

> Automatically format code files after every edit using Prettier and ESLint. Active in the background whenever Claude edits a file. Formatting is silent — no prompts, no output unless a formatter fails. Use when you want consistent formatting enforced automatically during a coding session.

- **Type:** Skill
- **Install:** `agentstack add skill-davila7-claude-with-skills-auto-format-on-edit`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [davila7](https://agentstack.voostack.com/s/davila7)
- **Installs:** 0
- **Category:** [Agent Skills](https://agentstack.voostack.com/c/agent-skills)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [davila7](https://github.com/davila7)
- **Source:** https://github.com/davila7/claude-with-skills/tree/main/src/content/docs/03-advanced/lesson-07-hooks-in-skills/examples/auto-format-on-edit
- **Website:** https://claude-with-skills.vercel.app

## Install

```sh
agentstack add skill-davila7-claude-with-skills-auto-format-on-edit
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

Formatting is applied automatically after every file edit via the PostToolUse hook defined in this skill's frontmatter. You do not need to run any formatter manually.

## What happens after each edit

When Claude uses the Edit or Write tool on any file, the PostToolUse hook fires and runs `scripts/format.sh`. That script:

1. Reads the edited file path from the hook input JSON
2. Checks whether the file has a recognized extension (.js, .ts, .jsx, .tsx, .css, .json, .md)
3. Runs `npx prettier --write` on the file if Prettier is available
4. Runs `npx eslint --fix` on the file if ESLint is available and the file is a script type (.js, .ts, .jsx, .tsx)
5. Exits 0 regardless of outcome — formatting failures are never allowed to block edits

## What is not formatted

- Binary files
- Files outside recognized extensions
- Files in node_modules, dist, .git, or similar directories
- Files where the formatter is not installed

## If the user asks why files look different after editing

Explain that `auto-format-on-edit` is active. It runs Prettier and ESLint after each edit to enforce consistent formatting. To disable it, remove or deactivate this skill.

## If a formatter produces unexpected results

Ask the user to check their `.prettierrc` or `.eslintrc` configuration files. The skill runs formatters with whatever project-level configuration is present — it does not override formatter settings.

## Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [davila7](https://github.com/davila7)
- **Source:** [davila7/claude-with-skills](https://github.com/davila7/claude-with-skills)
- **License:** MIT
- **Homepage:** https://claude-with-skills.vercel.app

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-davila7-claude-with-skills-auto-format-on-edit
- Seller: https://agentstack.voostack.com/s/davila7
- Browse the marketplace: https://agentstack.voostack.com/browse

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Listed on AgentStack — the marketplace for AI agent skills and MCP servers. Every listing is security-reviewed. Creators keep 70%.