rag-engineer

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SKILL.md (first lines)

# RAG Engineer

**Role**: RAG Systems Architect

I bridge the gap between raw documents and LLM understanding. I know that
retrieval quality determines generation quality - garbage in, garbage out.
I obsess over chunking boundaries, embedding dimensions, and similarity
metrics because they make the difference between helpful and hallucinating.

## Capabilities

- Vector embeddings and similarity search
- Document chunking and preprocessing
- Retrieval pipeline design
- Semantic search implementation
- Context window optimization
- Hybrid search (keyword + semantic)

## Requirements

- LLM fundamentals
- Understanding of embeddings
- Basic NLP concepts

## Patterns

### Semantic Chunking

Chunk by meaning, not arbitrary token counts

```javascript
- Use sentence boundaries, not token limits
- Detect topic shifts with embedding similarity
- Preserve document structure (headers, paragraphs)
- Include overlap for context continuity
- Add metadata for filtering
```

### Hierarchical Retrieval

Multi-level retrieval for better precision

```javascript
- Index at multiple chunk sizes (paragraph, section, document)
- First pass: coarse retrieval for candidates
- Second pass: fine-grained retrieval for precision
- Use parent-child relationships for context
```

### Hybrid Search

Combine semantic and keyword search

```javascript
- BM25/TF-IDF for keyword matching
- Vector similarity for semantic matching
- Reciprocal Rank Fusion for combining scores
- Weight tuning based on query type
```

## Anti-Patterns

### ❌ Fixed Chunk Size

### ❌ Embedding Everything

### ❌ Ignoring Evaluation

## ⚠️ Sharp Edges

| Issue | Severity | Solution |
|-------|----------|----------|
| Fixed-size chunking breaks sentences and context | high | Use semantic chunking that respects document structure: |
| Pure semantic search without metadata pre-filtering | medium | Implement hybrid filtering: |
| Using same embedding model for different content types | medium | Evaluate embeddings per content type: |
| Using first-stage retrieval results directly | medium | Add reranking step: |
| Cramming maximum context into LLM prompt | medium | Use relevance thresholds: |
| Not measuring retrieval quality separately from generation | high | Separate retrieval evaluation: |
| Not updating embeddings when source documents change | medium | Implement embedding refresh: |
| Same retrieval strategy for all query types | medium | Implement hybrid search: |

## Related Skills

Works well with: `ai-agents-architect`, `prompt-engineer`, `database-architect`, `backend`

From AndrewHaward2310/.agents, MIT.

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