The State class provides a way to manage state and history across a network of agents. It includes key-value storage and maintains a stack of all agent interactions. The State is accessible to all Agents, Tools and Routers as a state or network.state property.

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Creating State

import { createState } from '@inngest/agent-kit';

export interface NetworkState {
  // username is undefined until extracted and set by a tool
  username?: string;
}

const state = createState<NetworkState>({
  username: 'bar',
});

console.log(state.data.username); // 'bar'


const network = createNetwork({
  // ...
});

// Pass in state to each run
network.run("<query>", { state })

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Reading and Modifying State’s data (state.data)

The State class provides typed data accesible via the data property.
Learn more about the State use cases in the State concept guide.
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data
object<T>
A standard, mutable object which can be updated and modified within tools.

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State History

The State history is passed as a history to the lifecycle hooks and via the network argument to the Tools handlers to the Router function. The State history can be retrieved - as a copy - using the state.results property composed of InferenceResult objects:

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InferenceResult

The InferenceResult class represents a single agent call as part of the network state. It stores all inputs and outputs for a call.
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agent
Agent
The agent responsible for this inference call.
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input
string
The input passed into the agent’s run method.
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prompt
Message[]
The input instructions without additional history, including the system prompt, user input, and initial agent assistant message.
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history
Message[]
The history sent to the inference call, appended to the prompt to form a complete conversation log.
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output
Message[]
The parsed output from the inference call.
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toolCalls
ToolResultMessage[]
Output from any tools called by the agent.
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raw
string
The raw API response from the call in JSON format.

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Message Types

The state system uses several message types to represent different kinds of interactions: 
type Message = TextMessage | ToolCallMessage | ToolResultMessage;

interface TextMessage {
  type: "text";
  role: "system" | "user" | "assistant";
  content: string | Array<TextContent>;
  stop_reason?: "tool" | "stop";
}

interface ToolCallMessage {
  type: "tool_call";
  role: "user" | "assistant";
  tools: ToolMessage[];
  stop_reason: "tool";
}

interface ToolResultMessage {
  type: "tool_result";
  role: "tool_result";
  tool: ToolMessage;
  content: unknown;
  stop_reason: "tool";
}