Grammar Design

SkillMedia

Expert skill for formal grammar design including disambiguation, precedence, and validation

Instructions available. Your AI can read the instructions. Execution depends on the setup they require.

Account requirements not reviewed. Check the skill instructions before use; ahel provides instructions and does not run this skill.

Add ahel to your AI once: Claude, ChatGPT, Cursor, Claude Code or Codex. Then ask it to use this.

Then ask your AI: use the Grammar Design skill

What this skill tells your AI

The instructions your AI receives, as published by a5c-ai/babysitter in library/specializations/programming-languages/skills/grammar-design/SKILL.md and read by ahel’s review.

Overview

Expert skill for formal grammar design including disambiguation, precedence, and validation.

Capabilities

Write EBNF/BNF grammar specifications
Design unambiguous grammars
Handle operator precedence and associativity
Analyze grammar conflicts
Design grammar for specific parser classes (LL, LR, PEG)
Document grammar with examples
Design syntax for common language constructs
Handle grammar evolution and backwards compatibility

Target Processes

language-grammar-design.js
lexer-implementation.js
parser-development.js

Dependencies

Parsing theory literature (Dragon Book, Parsing Techniques)

Usage Guidelines

Notation: Use standard EBNF notation for grammar specifications
Disambiguation: Make grammars unambiguous or document precedence rules
Parser Class: Design grammar to fit target parser class (LL(k), LALR, PEG)
Examples: Include examples for all grammar rules
Evolution: Plan for backwards-compatible grammar evolution

Output Schema

{
  "type": "object",
  "properties": {
    "notation": {
      "type": "string",
      "enum": ["ebnf", "bnf", "peg", "antlr"]
    },
    "parserClass": {
      "type": "string",
      "enum": ["ll1", "llk", "lalr", "glr", "peg"]
    },
    "productionCount": { "type": "integer" },
    "conflicts": {
      "type": "array",
      "items": { "type": "string" }
    },
    "generatedFiles": {
      "type": "array",
      "items": { "type": "string" }
    }
  }
}

Signals

GitHub stars: 2k
Forks: 112
Last commit: Sep 2026

Advanced

Item type: skill
Key: grammar-design
Source: github.com/a5c-ai/babysitter

github.com/a5c-ai/babysitter