# execution-guardrails

This skill sets checks for reporting problems, batching minor warnings, and editing text safely. Its rules apply even when fable-mode’s staged loop is off.

- skill · `type=skill` · Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, OpenCode · ★ 878
- Author: mrtooher
- License: not stated · policy=link-only · description only; the file stays with the author
- Source: https://github.com/mrtooher/fable-mode/tree/HEAD/execution-guardrails/SKILL.md
- Updated: 2026-10-24
- HTML: https://affpapa.org/en/nevibecode/skills/execution-guardrails

## What it does

Before reporting a problem, the agent must confirm it by searching, reviewing a diff, running the code, or checking the source. A lack of evidence alone does not establish a fault. The same standard applies when the agent describes a capability limit: it must say what it tried and where it failed.

Minor concerns are counted across a run. At the default threshold of three, the agent presents them together; the user can choose another threshold. A confirmed concern serious enough on its own does not have to wait. For substring edits, the skill calls for word-boundary matching and a follow-up search for malformed words. If a target appears more than once, the agent must narrow the match rather than replace every occurrence.

These rules apply to every task, with or without fable-mode. To install in Claude Code, run `npx skills add mrtooher/fable-mode --skill execution-guardrails -a claude-code`. The skill file is placed at `~/.claude/skills/execution-guardrails/SKILL.md`.

## Install

### Claude Code (native platform)

1. **Skills CLI (Vercel)**
```bash
npx skills add mrtooher/fable-mode --skill execution-guardrails -a claude-code
```

2. **Manually: put the files in place**
- File: `~/.claude/skills/execution-guardrails/SKILL.md` — Copy the whole skill folder; for one project use .claude/skills/execution-guardrails/

### Codex

1. **Skills CLI (Vercel)**
```bash
npx skills add mrtooher/fable-mode --skill execution-guardrails -a codex
```

2. **Manually: put the files in place**
- File: `.agents/skills/execution-guardrails/SKILL.md` — For all projects use ~/.agents/skills/

### Cursor

1. **Skills CLI (Vercel)**
```bash
npx skills add mrtooher/fable-mode --skill execution-guardrails -a cursor
```

2. **Manually: put the files in place**
- File: `.cursor/skills/execution-guardrails/SKILL.md` — Cursor also reads .agents/skills/ and .claude/skills/

### GitHub Copilot

1. **GitHub CLI**
```bash
gh skill install mrtooher/fable-mode execution-guardrails
```

2. **Manually: put the files in place**
- File: `.github/skills/execution-guardrails/SKILL.md`

### Gemini CLI

1. **Skills CLI (Vercel)**
```bash
npx skills add mrtooher/fable-mode --skill execution-guardrails -a gemini-cli
```

2. **Platform CLI**
```bash
gemini skills install https://github.com/mrtooher/fable-mode --path execution-guardrails
```

### Windsurf (Devin Desktop)

**Manually: put the files in place**
- File: `.devin/skills/execution-guardrails/SKILL.md` — The legacy .windsurf/skills/ path still works

### OpenCode

**Skills CLI (Vercel)**
```bash
npx skills add mrtooher/fable-mode --skill execution-guardrails -a opencode
```

### Claude.ai

**Claude.ai**
- Zip the folder and upload it in Settings → Capabilities → Skills

Where a file is given instead of a command, copy the files from the source to that path: https://github.com/mrtooher/fable-mode/tree/HEAD/execution-guardrails/SKILL.md

## When to use it
- confirm a defect before reporting it
- batch minor concerns into one warning
- confine text replacements to word boundaries
- check edited files for malformed compound words

## Example prompts
- Check that this issue is present before you report it.
- Keep a count of minor concerns and raise them together at three.
- Replace this text safely, then look for damaged neighboring words.

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From the same set: [mrtooher/fable-mode](https://affpapa.org/en/nevibecode/by/mrtooher/fable-mode.md) — 3 cards

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