# Copilot Ld Copilot Ld Libutil

> libutil Skill

- Skill: `tomevault-io/copilot-ld-copilot-ld-libutil` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add tomevault-io/copilot-ld-copilot-ld-libutil`
- Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/copilot-ld-copilot-ld-libutil/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/copilot-ld-copilot-ld-libutil

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# libutil Skill

## When to Use

- Counting tokens for LLM context management
- Generating hashes and UUIDs
- Finding project root directory
- Running child processes
- Managing generated code bundles

## Key Concepts

**Token counting**: GPT-compatible tokenization for context window management.

**Project root**: Finds repository root by looking for package.json markers.

**Bundle management**: Download and extract pre-generated code bundles.

## Usage Patterns

### Pattern 1: Count tokens

```javascript
import { countTokens, estimateTokens } from "@copilot-ld/libutil";

const exact = countTokens("Hello, world!"); // Accurate count
const fast = estimateTokens("Hello, world!"); // Quick estimate
```

### Pattern 2: Generate identifiers

```javascript
import { generateHash, generateUuid } from "@copilot-ld/libutil";

const hash = generateHash(content); // 16-char SHA256
const uuid = generateUuid(); // Standard UUID
```

### Pattern 3: Find project root

```javascript
import { findProjectRoot } from "@copilot-ld/libutil";

const root = await findProjectRoot(); // /path/to/copilot-ld
```

## Integration

Used across packages for common utilities. countTokens used by libmemory.

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<!-- tomevault:4.0:skill_md:2026-04-13 -->