> ## Documentation Index
> Fetch the complete documentation index at: https://docs.veadk.xyz/llms.txt
> Use this file to discover all available pages before exploring further.

# Knowledge base retrieval

## Overview

Tool identifier `load_knowledgebase`.

System tools are built-in tools that VeADK mounts **automatically** based on the agent's configuration — you don't add them to the `tools` list yourself. When you pass a `knowledgebase` to the agent, VeADK mounts the `load_knowledgebase` tool. The agent decides on its own when to query the knowledge base and which keywords to search with, then uses the retrieved knowledge as context for its answer.

For backend types, initialization, and data ingestion, see the [knowledge base docs](/productions/veadk/archives/1.0.3/en/components/knowledge).

## Usage

```python lines theme={null}
from veadk import Agent, Runner
from veadk.knowledgebase import KnowledgeBase

# Build a knowledge base (see the knowledge base docs for backends and ingestion)
knowledgebase = KnowledgeBase(backend="local", index="company_faq")

agent = Agent(
    name="kb_agent",
    model_name="doubao-seed-1-8-251228",
    instruction="When answering, retrieve from the knowledge base where helpful.",
    knowledgebase=knowledgebase,  # mounts load_knowledgebase automatically
)

runner = Runner(agent=agent)
```

## Notes

<Note>
  System tools are managed by the framework: just provide a `knowledgebase` — you don't add `load_knowledgebase` to the `tools` list yourself. The agent decides when to call it based on its instruction and user input.
</Note>