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lai-gen-sysprompt

Generate or refine Langium DSL system prompts from language descriptors.

28|4|Updated Apr 10, 2025
Search Tags:#system prompt#LLM evaluation#Langium#prompt refinement#descriptor-driven#validator constraints#DSL code generation
One-click install
npx skills add https://github.com/eclipse-langium/langium-ai --skill lai-gen-sysprompt
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: lai-gen-sysprompt
Source: https://github.com/eclipse-langium/langium-ai/tree/main/skills/lai-gen-sysprompt
Command: npx skills add https://github.com/eclipse-langium/langium-ai --skill lai-gen-sysprompt

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

It helps you quickly create and iteratively improve a system prompt that gets LLMs to generate correct, validator-compliant code for your Langium DSL, especially when evaluation results reveal recurring failure patterns or missing language guidance.

Core Features & Use Cases

  • System prompt bootstrapping: Generates an initial system prompt from your language descriptor when no prompt exists yet.
  • Evaluation-driven refinement: Diagnoses gaps by inspecting evaluation runs and then guides targeted prompt improvements based on failure categories.
  • Language-change resilience: Encourages updating descriptor context before refining so regenerated rules and constraints stay aligned with the prompt.
  • Prompt quality hardening: Recommends adding validation rules, scoping/reference behavior, ordering by importance, and negative “common mistakes” examples to reduce syntactic and semantic failures.

Quick Start

Run lai-gen-sysprompt in your project and ask it to generate the missing system prompt from your descriptor so you can start evaluating immediately.

Frequently Asked Questions about lai-gen-sysprompt

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I generate a system prompt for my Langium DSL?▼

Generate a Langium DSL system prompt by running lai-gen-sysprompt in your project to bootstrap an initial markdown prompt directly from your language descriptor file.

How do I refine an LLM system prompt when evaluation results show recurring failures?▼

Refine an LLM system prompt by diagnosing low pass rates and recurring error categories from evaluation runs, then applying targeted edits to grammar overviews and validation rules.

What prerequisites do I need to create a descriptor-driven system prompt?▼

Creating a descriptor-driven system prompt requires running lai init and having a language.descriptor.yml file present in your project to ensure proper context alignment.

What should I include in a system prompt to reduce DSL code generation errors?▼

Reduce DSL code generation errors by adding validator constraints, scoping behavior, reference rules, and negative common mistakes examples to your system prompt.

Why does my regenerated system prompt contain outdated validation rules?▼

Regenerated system prompts contain outdated validation rules when the descriptor context is not updated before refining, causing misalignment between the prompt and current language constraints.

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