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+# Agent-Side Search Patterns
+
+## Purpose
+
+Documents recommended patterns for agent-side query expansion and reranking, which are caller responsibilities rather than engine features. These patterns are communicated via MCP tool descriptions.
+
+## Requirements
+
+### Requirement: Query expansion guidance in tool description
+
+The `kb_search` MCP tool description SHALL include guidance on query expansion as a recommended pattern for complex queries.
+
+#### Scenario: Tool description includes expansion pattern
+- **WHEN** an agent reads the `kb_search` tool description
+- **THEN** the description SHALL include guidance such as: "For complex queries, consider expanding into 2-3 variant phrasings and calling this tool multiple times, then deduplicating results by chunk_id"
+
+---
+
+### Requirement: Reranking guidance in tool description
+
+The `kb_search` MCP tool description SHALL include guidance on agent-side reranking as a recommended pattern for improving precision.
+
+#### Scenario: Tool description includes reranking pattern
+- **WHEN** an agent reads the `kb_search` tool description
+- **THEN** the description SHALL include guidance such as: "For precision, rerank the returned results using your own judgement based on relevance to the original question"
+
+---
+
+### Requirement: No engine-side LLM dependency
+
+The engine SHALL NOT require or use any external LLM API for search operations. Query expansion and reranking SHALL remain entirely agent-side concerns.
+
+#### Scenario: Engine has no LLM dependency
+- **WHEN** the engine is deployed without any `ANTHROPIC_API_KEY` or similar LLM API configuration
+- **THEN** all search operations SHALL function fully, with no degraded results or missing features