Generate comprehensive .eval.ts evaluation suites for Langium DSL projects.
npx skills add https://github.com/eclipse-langium/langium-ai --skill lai-gen-evals
Please help me install this Agent Skill. Skill: lai-gen-evals Source: https://github.com/eclipse-langium/langium-ai/tree/main/skills/lai-gen-evals Command: npx skills add https://github.com/eclipse-langium/langium-ai --skill lai-gen-evals
This Skill helps you create an evaluation suite that measures whether an LLM produces Langium DSL code that is syntactically correct, semantically valid, matches user intent, and handles edge cases—so you can iterate reliably instead of relying on superficial “it parses” checks.
Use the lai-gen-evals skill to generate a comprehensive eval suite inside your project’s evals/ directory based on your existing descriptor, system prompt, and Langium language validation behavior.
High-intent search queries and answers about installing and using this skill.
You can generate an LLM evaluation suite by creating .eval.ts files in an initialized evals directory that use the langium-ai-tools eval API to test syntactic correctness, semantic validity, and user intent alignment.
Semantic validation verifies generated programs against your actual Langium parser and validator using LangiumEvaluator to ensure generated DSL code is logically valid and aligns with user intent.
Test intent matching by expanding eval coverage into focused suites for understanding and edge cases, computing meaningful 0–1 composite scores, and returning useful diagnostics and extra metadata.
Yes, running Langium evals requires a configured generateResponse helper, an initialized evals directory, and Langium services for evaluation to execute the LangiumEvaluator.
The best way to organize test suites for model comparison is to categorize evals into focused suites like syntax, semantics, intent, edge cases, and understanding to build a reliable eval matrix.
Your evaluation only checks parsing because it lacks expanded eval coverage for semantic validity and intent alignment, which requires generating refined eval files using the langium-ai-tools eval API.
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