Search Hierarchy

Hook Enforcement

The grep-to-leann.sh hook automatically:

1. Detects query type (structural/semantic/literal)
2. Blocks and suggests AST-grep for structural queries
3. Blocks and suggests LEANN for semantic queries
4. Allows literal patterns through to Grep

DO

• Start with AST-grep for code structure questions
• Use LEANN for "how does X work" questions
• Use Grep only for exact identifier matches
• Read files only after finding them via search

DON'T

• Use Grep for conceptual questions (returns nothing)
• Read files before knowing which ones are relevant
• Use Read when AST-grep would give file:line
• Ignore hook suggestions

Examples

# STRUCTURAL → AST-grep
ast-grep --pattern "async def $FUNC($$$):" --lang python

# SEMANTIC → LEANN
leann search opc-dev "how does authentication work" --top-k 3

# LITERAL → Grep
Grep pattern="check_evocation" path=opc/scripts

# FULL CONTEXT → Read (after finding file)
Read file_path=opc/scripts/z3_erotetic.py

Optimal Flow

1. AST-grep: "Find async functions" → 3 file:line matches
2. Read: Top match only → Full understanding
3. Skip: 4 irrelevant files → 6000 tokens saved