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arag-hierarchical-retrieval Enable LLM agents to autonomously retrieve information across multiple granularities using keyword search, semantic search, and chunk read tools. Simple ReAct-based loop with hierarchical interfaces outperforms dense retrieval by allowing adaptive information seeking without complex graph construction.
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name arag-hierarchical-retrieval title A-RAG: Scaling Agentic Retrieval-Augmented Generation via Hierarchical Retrieval version 0.0.2 engine skillxiv-v0.0.2-claude-opus-4.6 license MIT url https://arxiv.org/abs/2602.03442 keywords ["Retrieval-Augmented Generation","Agent Autonomy","Hierarchical Interfaces","Information Seeking","Tool Calling"] description Enable LLM agents to autonomously retrieve information across multiple granularities using keyword search, semantic search, and chunk read tools. Simple ReAct-based loop with hierarchical interfaces outperforms dense retrieval by allowing adaptive information seeking without complex graph construction.
A-RAG: Agent-Driven Hierarchical Retrieval
Standard RAG systems retrieve all relevant passages upfront, but this assumes the retriever knows exactly what to find. A-RAG gives LLM agents autonomy to iteratively explore documents using three complementary tools: keyword search for entity lookups, semantic search for concept matching, and chunk read for full document access. This hierarchical approach mirrors human information-seeking behavior and enables agents to refine queries based on intermediate findings.
The key insight is that agents learn effective search strategies better than fixed retrievers. By exposing multiple retrieval granularities, the system allows adaptive information gathering without requiring complex graph construction or learning separate retrieval policies.
Core Concept
A-RAG operates on three retrieval tools that agents can call autonomously:
Keyword Search : Exact text matching for specific entities and termsSemantic Search : Embedding-based similarity to find conceptually related passagesChunk Read : Access full document content after identifying relevant sections
Rather than ranking documents globally, agents iteratively refine their information gathering strategy, mimicking how humans explore documents interactively.
Architecture Overview
Document Index : Standard chunking (~1000 tokens) with keyword and embedding indicesRetrieval Tool Set : Three callable tools with distinct semanticsAgent Loop : ReAct-style reasoning with tool calls and observationsTracking Mechanism : Remembers previously-read chunks to avoid redundant queriesIntegration Layer : Works with existing LLM APIs that support tool calling
Implementation
Step 1: Create Hierarchical Document Index
Build indices supporting all three retrieval modalities.
from sentence_transformers import SentenceTransformer
class HierarchicalDocumentIndex :
def __init__ (self, model_name: str = "sentence-transformers/all-MiniLM-L6-v2" ):
"""
Index documents for hierarchical retrieval.
Args:
model_name: Sentence embedding model
"""
self
self
self
self
def
index_document
self, doc_id: str , text: str ,
chunk_size: int = 1000
"""Break document into chunks and build indices."""
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def
keyword_search
self, query: str , top_k: int = 5
List
str
"""Search by exact keyword matching."""
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def
semantic_search
self, query: str , top_k: int = 5
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"""Search by semantic similarity."""
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def
read_chunk
self, chunk_id: str
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"""Retrieve full chunk content."""
return
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"Chunk not found"
Step 2: Implement Retrieval Tool Wrapper Create tool interface that agents can call.
class RetrievalToolset :
def __init__ (self, index: HierarchicalDocumentIndex ):
"""Wrap index as callable tools."""
self .index = index
self .accessed_chunks = set ()
def keyword_search_tool (self, query: str , top_k: int = 5 ) -> str :
"""Tool: search documents by keyword."""
chunk_ids = self .index.keyword_search(query, top_k=top_k)
result = f"Found {len (chunk_ids)} results for '{query} ':\n"
for i, chunk_id in enumerate (chunk_ids, 1 ):
preview = self .index.chunks[chunk_id][:100 ]
result += f"{i} . {chunk_id} : {preview} ...\n"
return result
def semantic_search_tool (self, query: str , top_k: int = 5 ) -> str :
"""Tool: search documents by semantic similarity."""
chunk_ids = self .index.semantic_search(query, top_k=top_k)
result = f"Found {len (chunk_ids)} semantically similar results:\n"
for i, chunk_id in enumerate (chunk_ids, 1 ):
preview = self .index.chunks[chunk_id][:100 ]
result += f"{i} . {chunk_id} : {preview} ...\n"
return result
def read_chunk_tool (self, chunk_id: str ) -> str :
"""Tool: read full chunk content."""
if chunk_id in self .accessed_chunks:
return "Already read this chunk. Use a different query to find new information."
content = self .index.read_chunk(chunk_id)
self .accessed_chunks.add(chunk_id)
return f"Content of {chunk_id} :\n{content} "
def get_tools_schema (self ) -> List [dict ]:
"""Return OpenAI-style tool schema for agent."""
return [
{
"name" : "keyword_search" ,
"description" : "Search documents by exact keyword matching" ,
"parameters" : {
"type" : "object" ,
"properties" : {
"query" : {"type" : "string" , "description" : "Search query" },
"top_k" : {"type" : "integer" , "description" : "Number of results" }
}
}
},
{
"name" : "semantic_search" ,
"description" : "Search documents by semantic similarity" ,
"parameters" : {
"type" : "object" ,
"properties" : {
"query" : {"type" : "string" , "description" : "Search query" },
"top_k" : {"type" : "integer" , "description" : "Number of results" }
}
}
},
{
"name" : "read_chunk" ,
"description" : "Read full content of a document chunk" ,
"parameters" : {
"type" : "object" ,
"properties" : {
"chunk_id" : {"type" : "string" , "description" : "Chunk identifier" }
}
}
}
]
Step 3: Implement ReAct-Based Agent Loop Create agent that reasons over tool calls.
class RAGAgent :
def __init__ (self, model: str , toolset: RetrievalToolset,
max_steps: int = 10 ):
"""
Agent for hierarchical retrieval reasoning.
Args:
model: LLM API (e.g., "gpt-4")
toolset: Retrieval tools
max_steps: Maximum reasoning steps
"""
self .model = model
self .toolset = toolset
self .max_steps = max_steps
self .history = []
def run (self, query: str ) -> str :
"""Execute agent loop to answer query."""
messages = []
step = 0
system_prompt = """You are an information-seeking agent. Answer questions by
using the available retrieval tools to find relevant information.
Use keyword_search for specific terms, semantic_search for concepts,
and read_chunk to examine full documents.
Only call read_chunk if you found a promising chunk from search results."""
messages.append({"role" : "system" , "content" : system_prompt})
messages.append({"role" : "user" , "content" : query})
while step < self .max_steps:
response = self ._call_model(messages)
if response.get("stop_reason" ) == "end_turn" :
return response.get("content" , "" )
if "tool_calls" not in response:
return response.get("content" , "" )
tool_results = []
for tool_call in response["tool_calls" ]:
result = self ._execute_tool(tool_call)
tool_results.append({
"tool_use_id" : tool_call["id" ],
"content" : result
})
messages.append({"role" : "assistant" , "content" : response["content" ]})
messages.append({"role" : "user" , "content" : tool_results})
step += 1
return "Max steps exceeded"
def _call_model (self, messages: List [dict ] ) -> dict :
"""Call LLM with tools."""
response = openai.ChatCompletion.create(
model=self .model,
messages=messages,
tools=self .toolset.get_tools_schema(),
tool_choice="auto" ,
temperature=0.7
)
return response
def _execute_tool (self, tool_call: dict ) -> str :
"""Execute a tool call."""
tool_name = tool_call["name" ]
params = tool_call["parameters" ]
if tool_name == "keyword_search" :
return self .toolset.keyword_search_tool(
params["query" ],
params.get("top_k" , 5 )
)
elif tool_name == "semantic_search" :
return self .toolset.semantic_search_tool(
params["query" ],
params.get("top_k" , 5 )
)
elif tool_name == "read_chunk" :
return self .toolset.read_chunk_tool(params["chunk_id" ])
return "Tool not found"
Step 4: Full Pipeline Integration Combine indexing, tools, and agent.
def build_arag_system (documents: List [str ],
model: str = "gpt-4" ) -> RAGAgent:
"""
Build complete A-RAG system from documents.
Args:
documents: List of document texts
model: LLM to use
Returns:
Initialized RAG agent
"""
index = HierarchicalDocumentIndex()
for i, doc in enumerate (documents):
index.index_document(f"doc_{i} " , doc)
toolset = RetrievalToolset(index)
agent = RAGAgent(model, toolset)
return agent
def query_arag (agent: RAGAgent, question: str ) -> str :
"""Query the A-RAG system."""
return agent.run(question)
Practical Guidance
Large document collections where agents benefit from exploration
Questions requiring cross-document synthesis
Scenarios where query refinement helps (agent learns to search better)
Open-ended information seeking where initial query may be imprecise
Simple fact lookup where keyword search suffices
Real-time systems where agent reasoning latency is prohibitive
Scenarios needing guaranteed retrieval (agents may get stuck)
Highly structured data better served by semantic search alone
Agent getting stuck in loops: Set reasonable max_steps (5-10 typical)
Too many tool calls: Penalize redundant searches; track accessed chunks
Poor search results: Ensure index quality and semantic model are appropriate
Incomplete answers: Agents may stop early; prompt for synthesis step at end
Hyperparameter Guidelines:
Parameter Range Tuning max_steps 5-15 Higher = more exploration; balance with latency chunk_size 500-1500 Larger = faster semantic search; smaller = more precision top_k (search) 3-10 Balance result diversity with noise embedding model small models for speed Use small (MiniLM) for latency; large (e5) for quality
Reference Key results: Outperforms dense retrieval by enabling adaptive information seeking. Simplest agent loop backbone for reproducibility. Code and evaluation suite released on GitHub. Works with modern LLM APIs supporting tool calling.
