title: Core. Task
A2A Node SDK - v0.1.0 / Modules / Core / Task
Interface: Task
Core.Task
Represents a task in the A2A protocol
Remarks
Tasks are the primary unit of work in the A2A protocol
Table of contents
Properties
- agentId
- artifacts
- contextId
- createdAt
- description
- error
- expectedParts
- id
- input
- inputSchema
- metadata
- name
- output
- outputSchema
- parts
- status
- transitions
- updatedAt
Properties
agentId
• Optional agentId: string
Optional ID of the agent assigned to this task
artifacts
• Optional artifacts: { content: Record<string, any> ; createdAt: string ; id: string ; type: "text" | "file" | "data" ; updatedAt: string }[]
Optional artifacts produced by this task
contextId
• Optional contextId: string
Optional context ID for grouping related tasks
createdAt
• createdAt: string
ISO timestamp when the task was created
description
• Optional description: string
Optional detailed description of the task
error
• Optional error: Object
Optional error information if the task failed
Type declaration
| Name | Type | Description |
|---|---|---|
code | number | Error code in the JSON-RPC reserved range |
data? | Record<string, any> | Optional additional error data |
message | string | Human-readable error message |
expectedParts
• Optional expectedParts: number
Optional count of expected message parts
id
• id: string
Unique identifier for the task
input
• Optional input: Record<string, any>
Optional input data for the task
inputSchema
• Optional inputSchema: Record<string, any>
Optional JSON schema defining the expected input format
metadata
• Optional metadata: Record<string, unknown>
Optional additional metadata
name
• name: string
Human-readable name of the task
output
• Optional output: Record<string, any>
Optional output data produced by the task
outputSchema
• Optional outputSchema: Record<string, any>
Optional JSON schema defining the expected output format
parts
• Optional parts: ({ content: string ; format: "plain" | "markdown" ; type: "text" } | { content: string | Uint8Array<ArrayBuffer> ; mimeType: string ; name: string ; size?: number ; type: "file" } | { content: Record<string, any> ; schema?: string ; type: "data" } | { content: string ; format: "plain" ; type: "heartbeat" })[]
Optional message parts associated with this task
status
• status: "submitted" | "working" | "input_required" | "completed" | "failed" | "canceled"
Current state of the task
transitions
• Optional transitions: TaskTransition[]
Optional history of state transitions
updatedAt
• updatedAt: string
ISO timestamp when the task was last updated