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

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

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

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

Pattern 3: Find project root

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.