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HttpAgent

The HttpAgent extends AbstractAgent to provide HTTP-based connectivity to remote AI agents. It handles the request/response cycle and transforms the HTTP event stream into standard Agent User Interaction Protocol events. 
import { HttpAgent } from "@ag-ui/client"

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Configuration

When creating an HTTP agent, you need to provide an HttpAgentConfig object: 
interface HttpAgentConfig extends AgentConfig {
  url: string // Endpoint URL for the agent service
  headers?: Record<string, string> // Optional HTTP headers
}

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Creating an HttpAgent

const agent = new HttpAgent({
  url: "https://api.example.com/v1/agent",
  headers: {
    Authorization: "Bearer your-api-key",
  },
})

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Methods

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runAgent()

Executes the agent by making an HTTP request to the configured endpoint. 
runAgent(parameters?: RunAgentParameters, subscriber?: AgentSubscriber): Promise<RunAgentResult>

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Parameters

The parameters argument follows the standard RunAgentParameters interface. The optional subscriber parameter allows you to provide an AgentSubscriber for handling events during this specific run.

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Return Value

interface RunAgentResult {
  result: any // The final result returned by the agent
  newMessages: Message[] // New messages added during this run
}

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subscribe()

Adds an AgentSubscriber to handle events across multiple agent runs. 
subscribe(subscriber: AgentSubscriber): { unsubscribe: () => void }
Returns an object with an unsubscribe() method to remove the subscriber when no longer needed.

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abortRun()

Cancels the current HTTP request using the AbortController. 
abortRun(): void

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Protected Methods

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requestInit()

Configures the HTTP request. Override this method to customize how requests are made. 
protected requestInit(input: RunAgentInput): RequestInit
Default implementation: 
{
  method: "POST",
  headers: {
    ...this.headers,
    "Content-Type": "application/json",
    Accept: "text/event-stream",
  },
  body: JSON.stringify(input),
  signal: this.abortController.signal,
}

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run()

Implements the abstract run() method from AbstractAgent using HTTP requests. 
protected run(input: RunAgentInput): RunAgent

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Properties

  • url: The endpoint URL for the agent service
  • headers: HTTP headers to include with requests
  • abortController: AbortController instance for request cancellation