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(WIP) agents (#171)

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Harrison Chase
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# Agents
Agents use an LLM to determine which tools to call and in what order.
Here are the supported types of agents available in LangChain.
For a tutorial on how to load agents, see [here](/getting_started/agents.ipynb).
### `zero-shot-react-description`
This agent uses the ReAct framework to determine which tool to use
based solely on the tool's description. Any number of tools can be provided.
This agent requires that a description is provided for each tool.
### `react-docstore`
This agent uses the ReAct framework to interact with a docstore. Two tools must
be provided: a `Search` tool and a `Lookup` tool (they must be named exactly as so).
The `Search` tool should search for a document, while the `Lookup` tool should lookup
a term in the most recently found document.
This agent is equivalent to the
original [ReAct paper](https://arxiv.org/pdf/2210.03629.pdf), specifically the Wikipedia example.
### `self-ask-with-search`
This agent utilizes a single tool that should be named `Intermediate Answer`.
This tool should be able to lookup factual answers to questions. This agent
is equivalent to the original [self ask with search paper](https://ofir.io/self-ask.pdf),
where a Google search API was provided as the tool.