A2A Protocol Type Definitions (types/a2a.ts)

Type definitions and helper factories conforming to the Agent-to-Agent (A2A) specification v0.3.0. Reuse when building interoperable agent communication interfaces.

// Source: https://github.com/elizaOS/eliza | License: MIT | Copyright 2026 Shaw Walters and elizaOS Contributors
// Provided via justclaw.it.com; keep this notice with the code.
/**
 * A2A Protocol Types
 *
 * Type definitions conforming to the A2A specification v0.3.0
 * @see https://google.github.io/a2a-spec/
 */

// ===== Core Enums =====

export type TaskState =
  | "submitted"
  | "working"
  | "input-required"
  | "auth-required"
  | "completed"
  | "canceled"
  | "failed"
  | "rejected";

export type Role = "user" | "agent";

export type PartType = "text" | "file" | "data";

// ===== Part Types =====

interface PartBase {
  type: PartType;
  metadata?: Record<string, unknown>;
}

export interface TextPart extends PartBase {
  type: "text";
  text: string;
}

export interface FileWi

... (truncated -- full source via MCP)