search-tools

# Search Tool Hierarchy When searching code, use this decision tree: ## Decision Tree ``` Need CONCEPTUAL/SEMANTIC search? (how does X work, find patterns, understand architecture) → Use LEANN (/leann-search) - embedding-based semantic search → PreToolUse hook auto-redirects semantic Grep queries Need to understand code STRUCTURE? (find function calls, class usages, refactor patterns) → Use AST-grep (/ast-grep-find) Need to find TEXT in code? → Use Morph (/morph-search) - 20x faster → If no Morph API key: fall back to Grep tool Simple one-off search? → Use built-in Grep tool directly ``` ## Tool Comparison | Tool | Best For | Requires | |------|----------|----------| | **LEANN** | Semantic search: "how does caching work", "error handling patterns", conceptual queries | Index built | | **AST-grep** | Structural patterns: "find all calls to `foo()`", refactoring, find usages by type | MCP server | | **Morph** | Fast text search: "find files mentioning error", grep across codebase | API key | | **Grep** | Literal patterns, class/function names, regex | Nothing (built-in) | ## Examples **LEANN** (semantic/conceptual): - "how does authentication work" - "find error handling patterns" - "where is rate limiting implemented" **AST-grep** (structural): - "Find all functions that return a Promise" - "Find all React components using useState" - "Refactor all imports of X to Y" **Morph** (text search): - "Find all files mentioning 'authentication'" - "Search for TODO comments" **Grep** (literal): - `class ProviderAdapter` - `def __init__` - Regex patterns ## LEANN Commands ```bash # Search with semantic query leann search opc-dev "how does blackboard communication work" --top-k 5 # List available indexes leann list # Rebuild index (when code changes) leann build opc-dev --docs dir1 dir2 --no-recompute --no-compact --force ```