@mastra/core/dist/a2a/index.cjs.map

{"version":3,"file":"index.cjs","names":["convertMessages","MessageList","MastraA2AError","#url","#description","#headers","#fetch","#retries","#backoffMs","#maxBackoffMs","#credentials","#abortSignal","#timeoutMs","#verifyAgentCard","#runState","#getBootstrap","#memory","RequestContext","#mastra","#sendAndResolve","#getTask","#resolveTaskToGenerateResult","#createBufferedStreamResult","#runRemoteStream","#resubscribeToRemoteStream","#cachedBootstrap","#resolveCardUrl","#request","#sendMessage","#evaluateTask","#delay","#consumeA2AStream","#collectStreamEvents","#streamEvents","#resolveRequestSignal"],"sources":["../../src/a2a/a2a-agent.ts"],"sourcesContent":["import { randomUUID } from 'node:crypto';\nimport type { AgentCard, Message, Task, TaskArtifactUpdateEvent, TaskStatusUpdateEvent } from '@a2a-js/sdk';\nimport type { AgentExecutionOptionsBase } from '../agent/agent.types';\nimport { MessageList } from '../agent/message-list';\nimport type { MastraDBMessage, MessageListInput } from '../agent/message-list';\nimport { convertMessages } from '../agent/message-list/utils/convert-messages';\nimport type { SubAgent } from '../agent/subagent';\nimport type { Mastra } from '../mastra';\nimport type { MastraMemory } from '../memory/memory';\nimport { RequestContext } from '../request-context';\nimport type { ChunkType } from '../stream/types';\nimport type { DynamicArgument } from '../types';\nimport { MastraA2AError } from './error';\nimport type {\n  A2AAgentCardVerificationContext,\n  A2AAgentGenerateResult,\n  A2AAgentOptions,\n  A2AAgentResumePayload,\n  A2AAgentRunState,\n  A2AAgentStreamResult,\n  JSONRPCResponse,\n  RequestCredentialsMode,\n} from './types';\n\ntype FetchLike = typeof fetch;\n\ntype JSONRPCRequestBody = {\n  jsonrpc: '2.0';\n  id: string;\n  method: string;\n  params?: Record<string, unknown>;\n};\n\ntype RequestOptions = {\n  method?: string;\n  headers?: Record<string, string>;\n  body?: unknown;\n  stream?: boolean;\n  credentials?: RequestCredentialsMode;\n  signal?: AbortSignal;\n};\n\ntype AgentBootstrap = {\n  card: AgentCard;\n  cardUrl: string;\n  executionUrl: string;\n  streamingSupported: boolean;\n};\n\ntype TerminalEvaluation =\n  | {\n      kind: 'completed';\n      text: string;\n      task?: Task;\n      message?: Message;\n    }\n  | {\n      kind: 'suspended';\n      text: string;\n      task: Task;\n      resumePayload: A2AAgentResumePayload;\n      resumeSchema?: string;\n    };\n\ntype StreamConsumptionResult = {\n  text: string;\n  task?: Task;\n  suspended?: {\n    payload: A2AAgentResumePayload;\n    resumeSchema?: string;\n  };\n};\n\ntype A2AStreamEventData = Message | Task | TaskStatusUpdateEvent | TaskArtifactUpdateEvent;\ntype A2AAgentFullStreamChunkBase =\n  | { type: 'start'; payload: { id: string } }\n  | { type: 'text-start'; payload: { id: string } }\n  | { type: 'text-delta'; payload: { id: string; text: string } }\n  | { type: 'text-end'; payload: { id: string } }\n  | {\n      type: 'tool-call-suspended';\n      payload: {\n        toolCallId: string;\n        toolName: string;\n        args: Record<string, never>;\n        suspendPayload: A2AAgentResumePayload;\n        resumeSchema: string;\n      };\n    }\n  | {\n      type: 'finish';\n      payload: A2AAgentFinishPayload;\n    };\n\ntype AgentFinishPayload = Extract<ChunkType, { type: 'finish' }>['payload'];\n\ntype A2AAgentFinishPayload = AgentFinishPayload & {\n  /** @deprecated Use `stepResult.reason`. Kept for consumers of the previous flat payload shape. */\n  finishReason: 'stop';\n  /** @deprecated Use `output.usage`. Kept for consumers of the previous flat payload shape. */\n  usage: typeof EMPTY_USAGE;\n};\ntype A2AAgentFullStreamChunk = A2AAgentFullStreamChunkBase & {\n  runId: string;\n  from: 'AGENT';\n};\n\ntype Deferred<T> = {\n  promise: Promise<T>;\n  resolve: (value: T | PromiseLike<T>) => void;\n  reject: (reason?: unknown) => void;\n};\n\nconst EMPTY_USAGE = {\n  inputTokens: undefined,\n  outputTokens: undefined,\n  totalTokens: undefined,\n};\n\nfunction toAgentStreamChunk(runId: string, chunk: A2AAgentFullStreamChunkBase): A2AAgentFullStreamChunk {\n  return {\n    ...chunk,\n    runId,\n    from: 'AGENT',\n  };\n}\n\nfunction createFinishPayload(): A2AAgentFinishPayload {\n  return {\n    stepResult: {\n      reason: 'stop',\n    },\n    output: {\n      usage: EMPTY_USAGE,\n    },\n    metadata: {},\n    messages: {\n      all: [],\n      user: [],\n      nonUser: [],\n    },\n    finishReason: 'stop',\n    usage: EMPTY_USAGE,\n  };\n}\n\nfunction isTask(result: Message | Task | TaskStatusUpdateEvent | TaskArtifactUpdateEvent): result is Task {\n  return typeof result === 'object' && result !== null && 'status' in result && 'id' in result && 'kind' in result;\n}\n\nfunction isMessage(result: Message | Task | TaskStatusUpdateEvent | TaskArtifactUpdateEvent): result is Message {\n  return typeof result === 'object' && result !== null && 'messageId' in result && 'parts' in result;\n}\n\nfunction isTerminalTaskState(state: Task['status']['state'] | undefined) {\n  return state === 'completed' || state === 'failed' || state === 'canceled' || state === 'rejected';\n}\n\nfunction splitNextEvent(buffer: string): { eventBlock?: string; rest: string } {\n  const normalizedBuffer = buffer.replace(/\\x1E/g, '\\n\\n');\n  const match = normalizedBuffer.match(/\\r?\\n\\r?\\n/);\n\n  if (!match || match.index === undefined) {\n    return { rest: normalizedBuffer };\n  }\n\n  return {\n    eventBlock: normalizedBuffer.slice(0, match.index),\n    rest: normalizedBuffer.slice(match.index + match[0].length),\n  };\n}\n\nfunction parseEventBlock(eventBlock: string): { done: true } | { event?: A2AStreamEventData } {\n  const trimmedBlock = eventBlock.trim();\n\n  if (!trimmedBlock) {\n    return {};\n  }\n\n  const lines = trimmedBlock.split(/\\r?\\n/);\n  const dataLines = lines.filter(line => line.startsWith('data:')).map(line => line.slice(5).trimStart());\n  const payload = dataLines.length > 0 ? dataLines.join('\\n') : trimmedBlock;\n\n  if (payload === '[DONE]') {\n    return { done: true };\n  }\n\n  let parsed: JSONRPCResponse<A2AStreamEventData> | A2AStreamEventData;\n\n  try {\n    parsed = JSON.parse(payload) as JSONRPCResponse<A2AStreamEventData> | A2AStreamEventData;\n  } catch {\n    return {};\n  }\n\n  if ('result' in parsed && parsed.result) {\n    return { event: parsed.result };\n  }\n\n  return { event: parsed as A2AStreamEventData };\n}\n\nfunction extractTextParts(parts: { kind: string; text?: string }[] | undefined): string {\n  return (parts ?? [])\n    .filter((part): part is { kind: string; text: string } => part.kind === 'text' && typeof part.text === 'string')\n    .map(part => part.text)\n    .join('\\n');\n}\n\nfunction extractTaskText(task: Task): string {\n  const artifactText = (task.artifacts ?? [])\n    .flatMap(\n      artifact =>\n        artifact.parts?.flatMap(part => {\n          if (part.kind === 'text' && 'text' in part && typeof part.text === 'string') {\n            return [part.text];\n          }\n\n          return [];\n        }) ?? [],\n    )\n    .join('\\n');\n  const statusText = task.status.message ? extractMessageText(task.status.message) : '';\n  return [artifactText, statusText].filter(Boolean).join('\\n').trim();\n}\n\nfunction extractTaskArtifactText(task: Task): string {\n  return (task.artifacts ?? [])\n    .flatMap(\n      artifact =>\n        artifact.parts?.flatMap(part => {\n          if (part.kind === 'text' && 'text' in part && typeof part.text === 'string') {\n            return [part.text];\n          }\n\n          return [];\n        }) ?? [],\n    )\n    .join('');\n}\n\nfunction extractMessageText(message: Message): string {\n  return extractTextParts(message.parts as { kind: string; text?: string }[] | undefined).trim();\n}\n\nfunction messagesToPrompt<OUTPUT>(messages: MessageListInput, options?: AgentExecutionOptionsBase<OUTPUT>): string {\n  if (typeof messages === 'string') {\n    return messages;\n  }\n\n  const converted = convertMessages(messages).to('AIV5.Model');\n  const lines: string[] = [];\n\n  if (options?.instructions) {\n    lines.push(`Instructions:\\n${options.instructions}`);\n  }\n\n  const contextMessages = options?.context as Array<{ role?: string; content?: unknown }> | undefined;\n  if (contextMessages?.length) {\n    lines.push(\n      'Context:\\n' +\n        contextMessages\n          .map(message => {\n            const role = message.role ?? 'unknown';\n            const content = typeof message.content === 'string' ? message.content : JSON.stringify(message.content);\n            return `${role}: ${content}`;\n          })\n          .join('\\n'),\n    );\n  }\n\n  for (const message of converted) {\n    if (message.role === 'system') {\n      const content = Array.isArray(message.content)\n        ? message.content\n            .map((part: { type: string; text?: string }) => {\n              if ('type' in part && part.type === 'text') {\n                return part.text;\n              }\n\n              return '';\n            })\n            .filter(Boolean)\n            .join('\\n')\n        : typeof message.content === 'string'\n          ? message.content\n          : '';\n\n      if (content) {\n        lines.push(`system: ${content}`);\n      }\n      continue;\n    }\n\n    const content = Array.isArray(message.content)\n      ? message.content\n          .map((part: { type: string; text?: string; filename?: string }) => {\n            if ('type' in part && part.type === 'text') {\n              return part.text;\n            }\n\n            if ('type' in part && part.type === 'file') {\n              return `[file:${part.filename ?? 'attachment'}]`;\n            }\n\n            return '';\n          })\n          .filter(Boolean)\n          .join('\\n')\n      : typeof message.content === 'string'\n        ? message.content\n        : '';\n\n    lines.push(`${message.role}: ${content}`);\n  }\n\n  return lines.join('\\n\\n').trim();\n}\n\nfunction resumeDataToPrompt(resumeData: unknown): string {\n  if (typeof resumeData === 'string') {\n    return resumeData;\n  }\n\n  if (resumeData == null) {\n    return '';\n  }\n\n  return JSON.stringify(resumeData, null, 2);\n}\n\nfunction createResumeSchema(): string {\n  return JSON.stringify({\n    type: 'object',\n    additionalProperties: true,\n    description: 'Data to continue the remote A2A task.',\n  });\n}\n\nfunction resolveStreamTextId(candidateIds: Array<string | undefined>): string {\n  for (const candidate of candidateIds) {\n    if (candidate) {\n      return candidate;\n    }\n  }\n\n  return 'text-1';\n}\n\nfunction resolveMemoryInfo<OUTPUT>(options?: AgentExecutionOptionsBase<OUTPUT>) {\n  const threadId = typeof options?.memory?.thread === 'string' ? options.memory.thread : options?.memory?.thread?.id;\n\n  return {\n    threadId,\n    resourceId: options?.memory?.resource,\n  };\n}\n\nfunction createResponseMessages(\n  text: string,\n  memoryInfo: { threadId?: string; resourceId?: string } = {},\n): MastraDBMessage[] {\n  if (!text) {\n    return [];\n  }\n\n  return new MessageList(memoryInfo)\n    .add(\n      {\n        role: 'assistant',\n        content: text,\n      },\n      'response',\n    )\n    .get.response.db();\n}\n\nfunction createGenerateResult({\n  runId,\n  text,\n  task,\n  message,\n  resumePayload,\n  resumeSchema,\n  threadId,\n  resourceId,\n}: {\n  runId: string;\n  text: string;\n  task?: Task;\n  message?: Message;\n  resumePayload?: A2AAgentResumePayload;\n  resumeSchema?: string;\n  threadId?: string;\n  resourceId?: string;\n}): A2AAgentGenerateResult {\n  const responseMessages = createResponseMessages(text, { threadId, resourceId });\n\n  return {\n    text,\n    usage: EMPTY_USAGE,\n    steps: [],\n    finishReason: resumePayload ? 'suspended' : 'stop',\n    warnings: [],\n    providerMetadata: undefined,\n    request: {},\n    reasoning: [],\n    reasoningText: undefined,\n    toolCalls: [],\n    toolResults: [],\n    sources: [],\n    files: [],\n    response: {\n      id: message?.messageId ?? task?.id ?? runId,\n      timestamp: new Date(),\n      modelId: 'a2a/remote-agent',\n      messages: [],\n      uiMessages: [],\n      dbMessages: responseMessages,\n    },\n    totalUsage: EMPTY_USAGE,\n    object: undefined,\n    error: undefined,\n    tripwire: undefined,\n    traceId: undefined,\n    spanId: undefined,\n    runId,\n    suspendPayload: resumePayload,\n    resumeSchema,\n    messages: responseMessages,\n    rememberedMessages: [],\n    task,\n    message,\n    resumePayload,\n  };\n}\n\nfunction unwrapA2AResult(result: unknown): Message | Task {\n  if (!result || typeof result !== 'object') {\n    throw MastraA2AError.invalidAgentResponse('Remote A2A agent returned an invalid response.');\n  }\n\n  if ('result' in result && result.result && typeof result.result === 'object') {\n    return result.result as Message | Task;\n  }\n\n  return result as Message | Task;\n}\n\nfunction createDeferred<T>(): Deferred<T> {\n  let resolve!: Deferred<T>['resolve'];\n  let reject!: Deferred<T>['reject'];\n\n  const promise = new Promise<T>((res, rej) => {\n    resolve = res;\n    reject = rej;\n  });\n\n  return { promise, resolve, reject };\n}\n\nasync function requireResponseBody(response: Response, operation: string) {\n  if (!response.body) {\n    throw MastraA2AError.invalidAgentResponse(`Remote A2A agent returned an empty stream for ${operation}.`);\n  }\n\n  return response.body;\n}\n\nexport class A2AAgent implements SubAgent {\n  readonly id: string;\n  readonly name: string;\n\n  readonly #url: string;\n  readonly #description: string;\n  readonly #headers: Record<string, string>;\n  readonly #fetch: FetchLike;\n  readonly #retries: number;\n  readonly #backoffMs: number;\n  readonly #maxBackoffMs: number;\n  readonly #credentials?: RequestCredentialsMode;\n  readonly #abortSignal?: AbortSignal;\n  readonly #timeoutMs?: number;\n  readonly #verifyAgentCard?: A2AAgentOptions['verifyAgentCard'];\n\n  #cachedBootstrap?: AgentBootstrap;\n  readonly #runState = new Map<string, A2AAgentRunState>();\n  #memory?: DynamicArgument<MastraMemory>;\n  #mastra?: Mastra;\n\n  constructor(options: A2AAgentOptions) {\n    this.#url = options.url.replace(/\\/$/, '');\n    this.#description = options.description ?? `Remote A2A agent at ${this.#url}`;\n    this.#headers = options.headers ?? {};\n    this.#fetch = options.fetch ?? fetch;\n    this.#retries = options.retries ?? 0;\n    this.#backoffMs = options.backoffMs ?? 250;\n    this.#maxBackoffMs = options.maxBackoffMs ?? 1_000;\n    this.#credentials = options.credentials;\n    this.#abortSignal = options.abortSignal;\n    this.#timeoutMs = options.timeoutMs;\n    this.#verifyAgentCard = options.verifyAgentCard;\n    this.id = options.id ?? `a2a-${randomUUID()}`;\n    this.name = options.name ?? options.description ?? 'A2A Agent';\n  }\n\n  async getAgentCard({ forceRefresh = false }: { forceRefresh?: boolean } = {}): Promise<AgentCard> {\n    return (await this.#getBootstrap({ forceRefresh })).card;\n  }\n\n  getDescription(): string {\n    return this.#description;\n  }\n\n  getModel: SubAgent['getModel'] = async () =>\n    ({ specificationVersion: 'v2' }) as Awaited<ReturnType<SubAgent['getModel']>>;\n\n  hasOwnMemory(): boolean {\n    return Boolean(this.#memory);\n  }\n\n  __setMemory(memory: DynamicArgument<MastraMemory>): void {\n    this.#memory = memory;\n  }\n\n  async getMemory({ requestContext = new RequestContext() }: { requestContext?: RequestContext } = {}) {\n    if (!this.#memory) {\n      return undefined;\n    }\n\n    if (typeof this.#memory !== 'function') {\n      return this.#memory;\n    }\n\n    return await this.#memory({\n      requestContext,\n      mastra: this.#mastra,\n    });\n  }\n\n  getInstructions: SubAgent['getInstructions'] = async () => '';\n\n  __registerMastra(mastra: Mastra): void {\n    this.#mastra = mastra;\n  }\n\n  async generate(\n    messages: MessageListInput,\n    options?: AgentExecutionOptionsBase<unknown>,\n  ): Promise<A2AAgentGenerateResult> {\n    const bootstrap = await this.#getBootstrap();\n    const runId = options?.runId ?? randomUUID();\n    const prompt = messagesToPrompt(messages, options);\n    const memoryInfo = resolveMemoryInfo(options);\n\n    return this.#sendAndResolve({\n      bootstrap,\n      runId,\n      prompt,\n      signal: options?.abortSignal,\n      ...memoryInfo,\n    });\n  }\n\n  async resumeGenerate(\n    resumeData: unknown,\n    options?: AgentExecutionOptionsBase<unknown>,\n  ): Promise<A2AAgentGenerateResult> {\n    const runId = options?.runId;\n    if (!runId) {\n      throw MastraA2AError.invalidParams('A2AAgent.resumeGenerate requires a runId.');\n    }\n\n    const state = this.#runState.get(runId);\n    if (!state) {\n      throw MastraA2AError.invalidParams(`No resumable A2A run state found for runId \"${runId}\".`);\n    }\n\n    const bootstrap = await this.#getBootstrap();\n    const memoryInfo = resolveMemoryInfo(options);\n\n    if (state.waitingForInput) {\n      const prompt = resumeDataToPrompt(resumeData);\n      return this.#sendAndResolve({\n        bootstrap,\n        runId,\n        prompt,\n        signal: options?.abortSignal,\n        contextId: state.contextId,\n        referenceTaskIds: state.taskId ? [state.taskId] : undefined,\n        ...memoryInfo,\n      });\n    }\n\n    if (!state.taskId) {\n      throw MastraA2AError.invalidParams(`A2AAgent resume state for \"${runId}\" is missing a taskId.`);\n    }\n\n    const task = await this.#getTask({\n      bootstrap,\n      taskId: state.taskId,\n      signal: options?.abortSignal,\n    });\n\n    return this.#resolveTaskToGenerateResult({\n      bootstrap,\n      runId,\n      task,\n      signal: options?.abortSignal,\n      ...memoryInfo,\n    });\n  }\n\n  async stream(\n    messages: MessageListInput,\n    options?: AgentExecutionOptionsBase<unknown>,\n  ): Promise<A2AAgentStreamResult> {\n    const bootstrap = await this.#getBootstrap();\n    const runId = options?.runId ?? randomUUID();\n    const prompt = messagesToPrompt(messages, options);\n    const memoryInfo = resolveMemoryInfo(options);\n\n    if (!bootstrap.streamingSupported) {\n      const result = await this.generate(messages, { ...options, runId });\n      return this.#createBufferedStreamResult({ runId, result, emitStart: true, ...memoryInfo });\n    }\n\n    return this.#runRemoteStream({\n      bootstrap,\n      runId,\n      prompt,\n      signal: options?.abortSignal,\n      emitStart: true,\n      ...memoryInfo,\n    });\n  }\n\n  async resumeStream(resumeData: unknown, options?: AgentExecutionOptionsBase<unknown>): Promise<A2AAgentStreamResult> {\n    const runId = options?.runId;\n    if (!runId) {\n      throw MastraA2AError.invalidParams('A2AAgent.resumeStream requires a runId.');\n    }\n\n    const state = this.#runState.get(runId);\n    if (!state) {\n      throw MastraA2AError.invalidParams(`No resumable A2A run state found for runId \"${runId}\".`);\n    }\n\n    const bootstrap = await this.#getBootstrap();\n    const memoryInfo = resolveMemoryInfo(options);\n\n    if (state.waitingForInput) {\n      const prompt = resumeDataToPrompt(resumeData);\n\n      if (!bootstrap.streamingSupported) {\n        const result = await this.resumeGenerate(resumeData, options);\n        return this.#createBufferedStreamResult({ runId, result, emitStart: false, ...memoryInfo });\n      }\n\n      return this.#runRemoteStream({\n        bootstrap,\n        runId,\n        prompt,\n        signal: options?.abortSignal,\n        contextId: state.contextId,\n        referenceTaskIds: state.taskId ? [state.taskId] : undefined,\n        // Resumed runs skip the `start` chunk, mirroring the regular Agent loop.\n        emitStart: false,\n        ...memoryInfo,\n      });\n    }\n\n    if (!state.taskId) {\n      throw MastraA2AError.invalidParams(`A2AAgent resume state for \"${runId}\" is missing a taskId.`);\n    }\n\n    if (!bootstrap.streamingSupported) {\n      const result = await this.resumeGenerate(resumeData, options);\n      return this.#createBufferedStreamResult({ runId, result, emitStart: false, ...memoryInfo });\n    }\n\n    return this.#resubscribeToRemoteStream({\n      bootstrap,\n      runId,\n      taskId: state.taskId,\n      initialTask: state.lastTask,\n      signal: options?.abortSignal,\n      ...memoryInfo,\n    });\n  }\n\n  async #getBootstrap({ forceRefresh = false }: { forceRefresh?: boolean } = {}): Promise<AgentBootstrap> {\n    if (!forceRefresh && this.#cachedBootstrap) {\n      return this.#cachedBootstrap;\n    }\n\n    const cardUrl = this.#resolveCardUrl();\n    const response = await this.#request(cardUrl, {\n      method: 'GET',\n      signal: this.#abortSignal,\n    });\n\n    const card = (await response.json()) as AgentCard;\n    const fetchedAt = new Date();\n\n    if (this.#verifyAgentCard) {\n      const context: A2AAgentCardVerificationContext = { cardUrl, fetchedAt };\n      await this.#verifyAgentCard.verify(card, context);\n    }\n\n    const bootstrap: AgentBootstrap = {\n      card,\n      cardUrl,\n      executionUrl: card.url,\n      streamingSupported: card.capabilities?.streaming ?? false,\n    };\n\n    this.#cachedBootstrap = bootstrap;\n    return bootstrap;\n  }\n\n  #resolveCardUrl() {\n    return this.#url.endsWith('/agent-card.json') ? this.#url : `${this.#url}/.well-known/agent-card.json`;\n  }\n\n  async #sendMessage({\n    bootstrap,\n    prompt,\n    signal,\n    contextId,\n    referenceTaskIds,\n  }: {\n    bootstrap: AgentBootstrap;\n    prompt: string;\n    signal?: AbortSignal;\n    contextId?: string;\n    referenceTaskIds?: string[];\n  }): Promise<Message | Task> {\n    const response = await this.#request(bootstrap.executionUrl, {\n      method: 'POST',\n      signal,\n      body: {\n        jsonrpc: '2.0',\n        id: randomUUID(),\n        method: 'message/send',\n        params: {\n          message: {\n            role: 'user',\n            kind: 'message',\n            messageId: randomUUID(),\n            parts: [{ kind: 'text', text: prompt }],\n            ...(contextId ? { contextId } : {}),\n            ...(referenceTaskIds?.length ? { referenceTaskIds } : {}),\n          },\n        },\n      } satisfies JSONRPCRequestBody,\n    });\n\n    const json = await response.json();\n    return unwrapA2AResult(json);\n  }\n\n  async #sendAndResolve({\n    bootstrap,\n    runId,\n    prompt,\n    signal,\n    contextId,\n    referenceTaskIds,\n    threadId,\n    resourceId,\n  }: {\n    bootstrap: AgentBootstrap;\n    runId: string;\n    prompt: string;\n    signal?: AbortSignal;\n    contextId?: string;\n    referenceTaskIds?: string[];\n    threadId?: string;\n    resourceId?: string;\n  }): Promise<A2AAgentGenerateResult> {\n    const response = await this.#sendMessage({\n      bootstrap,\n      prompt,\n      signal,\n      contextId,\n      referenceTaskIds,\n    });\n\n    if (isMessage(response)) {\n      this.#runState.delete(runId);\n      return createGenerateResult({\n        runId,\n        text: extractMessageText(response),\n        message: response,\n        threadId,\n        resourceId,\n      });\n    }\n\n    return this.#resolveTaskToGenerateResult({\n      bootstrap,\n      runId,\n      task: response,\n      signal,\n      threadId,\n      resourceId,\n    });\n  }\n\n  async #getTask({\n    bootstrap,\n    taskId,\n    signal,\n  }: {\n    bootstrap: AgentBootstrap;\n    taskId: string;\n    signal?: AbortSignal;\n  }): Promise<Task> {\n    const response = await this.#request(bootstrap.executionUrl, {\n      method: 'POST',\n      signal,\n      body: {\n        jsonrpc: '2.0',\n        id: randomUUID(),\n        method: 'tasks/get',\n        params: { id: taskId },\n      } satisfies JSONRPCRequestBody,\n    });\n\n    const json = await response.json();\n    const result = unwrapA2AResult(json);\n\n    if (!isTask(result)) {\n      throw MastraA2AError.invalidAgentResponse('Remote A2A agent returned a non-task response for tasks/get.');\n    }\n\n    return result;\n  }\n\n  async #resolveTaskToGenerateResult({\n    bootstrap,\n    runId,\n    task,\n    signal,\n    threadId,\n    resourceId,\n  }: {\n    bootstrap: AgentBootstrap;\n    runId: string;\n    task: Task;\n    signal?: AbortSignal;\n    threadId?: string;\n    resourceId?: string;\n  }): Promise<A2AAgentGenerateResult> {\n    let currentTask = task;\n\n    while (true) {\n      const evaluation = this.#evaluateTask({\n        bootstrap,\n        task: currentTask,\n      });\n\n      if (evaluation.kind === 'completed') {\n        this.#runState.delete(runId);\n\n        return createGenerateResult({\n          runId,\n          text: evaluation.text,\n          task: evaluation.task,\n          message: evaluation.message,\n          threadId,\n          resourceId,\n        });\n      }\n\n      this.#runState.set(runId, {\n        runId,\n        contextId: evaluation.task.contextId,\n        taskId: evaluation.task.id,\n        executionUrl: bootstrap.executionUrl,\n        cardUrl: bootstrap.cardUrl,\n        streamingSupported: bootstrap.streamingSupported,\n        waitingForInput: evaluation.resumePayload.waitingForInput,\n        lastTask: evaluation.task,\n      });\n\n      if (evaluation.task.status.state === 'input-required') {\n        return createGenerateResult({\n          runId,\n          text: evaluation.text,\n          task: evaluation.task,\n          resumePayload: evaluation.resumePayload,\n          resumeSchema: evaluation.resumeSchema,\n          threadId,\n          resourceId,\n        });\n      }\n\n      await this.#delay();\n\n      currentTask = await this.#getTask({\n        bootstrap,\n        taskId: evaluation.task.id,\n        signal,\n      });\n    }\n  }\n\n  #evaluateTask({ bootstrap, task }: { bootstrap: AgentBootstrap; task: Task }): TerminalEvaluation {\n    const text = extractTaskText(task);\n\n    if (task.status.state === 'input-required') {\n      return {\n        kind: 'suspended',\n        text,\n        task,\n        resumePayload: {\n          taskId: task.id,\n          contextId: task.contextId,\n          executionUrl: bootstrap.executionUrl,\n          cardUrl: bootstrap.cardUrl,\n          waitingForInput: true,\n          task: structuredClone(task),\n        },\n        resumeSchema: createResumeSchema(),\n      };\n    }\n\n    if (isTerminalTaskState(task.status.state)) {\n      return {\n        kind: 'completed',\n        text,\n        task,\n      };\n    }\n\n    return {\n      kind: 'suspended',\n      text,\n      task,\n      resumePayload: {\n        taskId: task.id,\n        contextId: task.contextId,\n        executionUrl: bootstrap.executionUrl,\n        cardUrl: bootstrap.cardUrl,\n        waitingForInput: false,\n        task: structuredClone(task),\n      },\n    };\n  }\n\n  async #runRemoteStream({\n    bootstrap,\n    runId,\n    prompt,\n    signal,\n    contextId,\n    referenceTaskIds,\n    threadId,\n    resourceId,\n    emitStart,\n  }: {\n    bootstrap: AgentBootstrap;\n    runId: string;\n    prompt: string;\n    signal?: AbortSignal;\n    contextId?: string;\n    referenceTaskIds?: string[];\n    threadId?: string;\n    resourceId?: string;\n    emitStart: boolean;\n  }): Promise<A2AAgentStreamResult> {\n    const response = await this.#request(bootstrap.executionUrl, {\n      method: 'POST',\n      signal,\n      stream: true,\n      body: {\n        jsonrpc: '2.0',\n        id: randomUUID(),\n        method: 'message/stream',\n        params: {\n          message: {\n            role: 'user',\n            kind: 'message',\n            messageId: randomUUID(),\n            parts: [{ kind: 'text', text: prompt }],\n            ...(contextId ? { contextId } : {}),\n            ...(referenceTaskIds?.length ? { referenceTaskIds } : {}),\n          },\n        },\n      } satisfies JSONRPCRequestBody,\n    });\n\n    return this.#consumeA2AStream({\n      bootstrap,\n      runId,\n      stream: await requireResponseBody(response, 'message/stream'),\n      threadId,\n      resourceId,\n      emitStart,\n    });\n  }\n\n  async #resubscribeToRemoteStream({\n    bootstrap,\n    runId,\n    taskId,\n    initialTask,\n    signal,\n    threadId,\n    resourceId,\n  }: {\n    bootstrap: AgentBootstrap;\n    runId: string;\n    taskId: string;\n    initialTask?: Task;\n    signal?: AbortSignal;\n    threadId?: string;\n    resourceId?: string;\n  }): Promise<A2AAgentStreamResult> {\n    const response = await this.#request(bootstrap.executionUrl, {\n      method: 'POST',\n      signal,\n      stream: true,\n      body: {\n        jsonrpc: '2.0',\n        id: randomUUID(),\n        method: 'tasks/resubscribe',\n        params: { id: taskId },\n      } satisfies JSONRPCRequestBody,\n    });\n\n    return this.#consumeA2AStream({\n      bootstrap,\n      runId,\n      initialTask,\n      stream: await requireResponseBody(response, 'tasks/resubscribe'),\n      threadId,\n      resourceId,\n      // Resubscribing continues an existing run; `start` is only emitted for fresh runs,\n      // mirroring the regular Agent loop which skips `start` when resuming.\n      emitStart: false,\n    });\n  }\n\n  async #consumeA2AStream({\n    bootstrap,\n    runId,\n    initialTask,\n    stream,\n    threadId,\n    resourceId,\n    emitStart,\n  }: {\n    bootstrap: AgentBootstrap;\n    runId: string;\n    initialTask?: Task;\n    stream: ReadableStream<Uint8Array>;\n    threadId?: string;\n    resourceId?: string;\n    emitStart: boolean;\n  }): Promise<A2AAgentStreamResult> {\n    const [consumerStream, accumulatorStream] = stream.tee();\n    const resultDeferred = createDeferred<A2AAgentGenerateResult>();\n    const textDeferred = createDeferred<string>();\n    const taskDeferred = createDeferred<Task | undefined>();\n    const suspendPayloadDeferred = createDeferred<A2AAgentResumePayload | undefined>();\n    const resumeSchemaDeferred = createDeferred<string | undefined>();\n    const messageList = new MessageList({ threadId, resourceId });\n\n    void this.#collectStreamEvents({\n      bootstrap,\n      initialTask,\n      stream: accumulatorStream,\n    })\n      .then(consumed => {\n        if (consumed.task && consumed.suspended) {\n          this.#runState.set(runId, {\n            runId,\n            contextId: consumed.task.contextId,\n            taskId: consumed.task.id,\n            executionUrl: bootstrap.executionUrl,\n            cardUrl: bootstrap.cardUrl,\n            streamingSupported: bootstrap.streamingSupported,\n            waitingForInput: consumed.suspended.payload.waitingForInput,\n            lastTask: consumed.task,\n          });\n        } else {\n          this.#runState.delete(runId);\n        }\n\n        textDeferred.resolve(consumed.text);\n        taskDeferred.resolve(consumed.task);\n        suspendPayloadDeferred.resolve(consumed.suspended?.payload);\n        resumeSchemaDeferred.resolve(consumed.suspended?.resumeSchema);\n        if (consumed.text) {\n          messageList.add(\n            {\n              role: 'assistant',\n              content: consumed.text,\n            },\n            'response',\n          );\n        }\n        resultDeferred.resolve(\n          createGenerateResult({\n            runId,\n            text: consumed.text,\n            task: consumed.task,\n            threadId,\n            resourceId,\n            ...(consumed.suspended\n              ? {\n                  resumePayload: consumed.suspended.payload,\n                  resumeSchema: consumed.suspended.resumeSchema,\n                }\n              : {}),\n          }),\n        );\n      })\n      .catch(error => {\n        textDeferred.reject(error);\n        taskDeferred.reject(error);\n        suspendPayloadDeferred.reject(error);\n        resumeSchemaDeferred.reject(error);\n        resultDeferred.reject(error);\n      });\n\n    const streamResult = {\n      runId,\n      fullStream: this.#streamEvents({ bootstrap, runId, stream: consumerStream, emitStart }),\n      text: textDeferred.promise,\n      toolResults: Promise.resolve([]),\n      messageList,\n      task: taskDeferred.promise,\n      suspendPayload: suspendPayloadDeferred.promise,\n      resumeSchema: resumeSchemaDeferred.promise,\n      getResult: async () => resultDeferred.promise,\n    };\n\n    return streamResult as unknown as A2AAgentStreamResult;\n  }\n\n  async *#streamEvents({\n    bootstrap,\n    runId,\n    stream,\n    emitStart,\n  }: {\n    bootstrap: AgentBootstrap;\n    runId: string;\n    stream: ReadableStream<Uint8Array>;\n    emitStart: boolean;\n  }): AsyncIterable<A2AAgentFullStreamChunk> {\n    if (emitStart) {\n      yield toAgentStreamChunk(runId, { type: 'start', payload: { id: this.id } });\n    }\n\n    const reader = stream.getReader();\n    const decoder = new TextDecoder();\n    let buffer = '';\n    let textId: string | undefined;\n    let textStarted = false;\n    let task: Task | undefined;\n    let suspended: A2AAgentResumePayload | undefined;\n    let receivedDone = false;\n\n    while (true) {\n      const { done, value } = await reader.read();\n\n      if (done) {\n        buffer += decoder.decode();\n      } else if (value) {\n        buffer += decoder.decode(value, { stream: true });\n      }\n\n      let next = splitNextEvent(buffer);\n      while (next.eventBlock !== undefined) {\n        const parsed = parseEventBlock(next.eventBlock);\n        if ('done' in parsed && parsed.done) {\n          receivedDone = true;\n          buffer = next.rest;\n          break;\n        }\n\n        if ('event' in parsed && parsed.event) {\n          const event = parsed.event;\n\n          if (isTask(event)) {\n            task = event;\n            if (event.status.state === 'input-required') {\n              suspended = {\n                taskId: event.id,\n                contextId: event.contextId,\n                executionUrl: bootstrap.executionUrl,\n                cardUrl: bootstrap.cardUrl,\n                waitingForInput: true,\n                task: structuredClone(event),\n              };\n            }\n          } else if (isMessage(event)) {\n            const text = extractMessageText(event);\n            if (text) {\n              textId ??= resolveStreamTextId([event.messageId, task?.id]);\n              if (textId) {\n                if (!textStarted) {\n                  yield toAgentStreamChunk(runId, { type: 'text-start', payload: { id: textId } });\n                  textStarted = true;\n                }\n                yield toAgentStreamChunk(runId, { type: 'text-delta', payload: { id: textId, text } });\n              }\n            }\n          } else if (event.kind === 'artifact-update') {\n            const text = event.artifact.parts\n              ?.flatMap(part =>\n                part.kind === 'text' && 'text' in part && typeof part.text === 'string' ? [part.text] : [],\n              )\n              .join('');\n            if (text) {\n              textId ??= resolveStreamTextId([event.artifact.artifactId, task?.id]);\n              if (textId) {\n                if (!textStarted) {\n                  yield toAgentStreamChunk(runId, { type: 'text-start', payload: { id: textId } });\n                  textStarted = true;\n                }\n                yield toAgentStreamChunk(runId, { type: 'text-delta', payload: { id: textId, text } });\n              }\n            }\n          } else if (event.kind === 'status-update') {\n            task = task\n              ? {\n                  ...task,\n                  status: event.status,\n                }\n              : task;\n            if (event.status.state === 'input-required' && task) {\n              suspended = {\n                taskId: task.id,\n                contextId: task.contextId,\n                executionUrl: bootstrap.executionUrl,\n                cardUrl: bootstrap.cardUrl,\n                waitingForInput: true,\n                task: structuredClone(task),\n              };\n            }\n          }\n        }\n\n        buffer = next.rest;\n        next = splitNextEvent(buffer);\n      }\n\n      if (done || receivedDone) {\n        if (textId && textStarted) {\n          yield toAgentStreamChunk(runId, { type: 'text-end', payload: { id: textId } });\n        }\n\n        if (!suspended && task && !isTerminalTaskState(task.status.state)) {\n          suspended = {\n            taskId: task.id,\n            contextId: task.contextId,\n            executionUrl: bootstrap.executionUrl,\n            cardUrl: bootstrap.cardUrl,\n            waitingForInput: false,\n            task: structuredClone(task),\n          };\n        }\n\n        if (suspended) {\n          yield toAgentStreamChunk(runId, {\n            type: 'tool-call-suspended',\n            payload: {\n              toolCallId: runId,\n              toolName: this.id,\n              args: {},\n              suspendPayload: suspended,\n              resumeSchema: createResumeSchema(),\n            },\n          });\n        } else {\n          yield toAgentStreamChunk(runId, {\n            type: 'finish',\n            payload: createFinishPayload(),\n          });\n        }\n        return;\n      }\n    }\n  }\n\n  async #collectStreamEvents({\n    bootstrap,\n    initialTask,\n    stream,\n  }: {\n    bootstrap: AgentBootstrap;\n    initialTask?: Task;\n    stream: ReadableStream<Uint8Array>;\n  }): Promise<StreamConsumptionResult> {\n    const reader = stream.getReader();\n    const decoder = new TextDecoder();\n    let buffer = '';\n    let textBuffer = '';\n    let task: Task | undefined = initialTask ? structuredClone(initialTask) : undefined;\n    let suspended: StreamConsumptionResult['suspended'];\n\n    while (true) {\n      const { done, value } = await reader.read();\n\n      if (done) {\n        buffer += decoder.decode();\n      } else if (value) {\n        buffer += decoder.decode(value, { stream: true });\n      }\n\n      let next = splitNextEvent(buffer);\n      while (next.eventBlock !== undefined) {\n        const parsed = parseEventBlock(next.eventBlock);\n        if ('done' in parsed && parsed.done) {\n          break;\n        }\n\n        if ('event' in parsed && parsed.event) {\n          const event = parsed.event;\n\n          if (isTask(event)) {\n            task = event;\n            textBuffer = extractTaskArtifactText(event) || textBuffer;\n\n            if (event.status.state === 'input-required') {\n              suspended = {\n                payload: {\n                  taskId: event.id,\n                  contextId: event.contextId,\n                  executionUrl: bootstrap.executionUrl,\n                  cardUrl: bootstrap.cardUrl,\n                  waitingForInput: true,\n                  task: structuredClone(event),\n                },\n                resumeSchema: createResumeSchema(),\n              };\n            }\n          } else if (isMessage(event)) {\n            const messageText = extractMessageText(event);\n            if (messageText) {\n              textBuffer = messageText;\n            }\n          } else if (event.kind === 'artifact-update') {\n            task = task\n              ? {\n                  ...task,\n                  artifacts: [\n                    ...(task.artifacts ?? []).filter(artifact => artifact.artifactId !== event.artifact.artifactId),\n                    event.artifact,\n                  ],\n                }\n              : task;\n\n            const artifactText = event.artifact.parts\n              ?.flatMap(part =>\n                part.kind === 'text' && 'text' in part && typeof part.text === 'string' ? [part.text] : [],\n              )\n              .join('');\n            if (artifactText) {\n              textBuffer += artifactText;\n            }\n          } else if (event.kind === 'status-update') {\n            task = task\n              ? {\n                  ...task,\n                  status: event.status,\n                }\n              : task;\n\n            if (event.status.state === 'input-required' && task) {\n              suspended = {\n                payload: {\n                  taskId: task.id,\n                  contextId: task.contextId,\n                  executionUrl: bootstrap.executionUrl,\n                  cardUrl: bootstrap.cardUrl,\n                  waitingForInput: true,\n                  task: structuredClone(task),\n                },\n                resumeSchema: createResumeSchema(),\n              };\n            }\n          }\n        }\n\n        buffer = next.rest;\n        next = splitNextEvent(buffer);\n      }\n\n      if (done) {\n        break;\n      }\n    }\n\n    if (!suspended && task && !isTerminalTaskState(task.status.state)) {\n      suspended = {\n        payload: {\n          taskId: task.id,\n          contextId: task.contextId,\n          executionUrl: bootstrap.executionUrl,\n          cardUrl: bootstrap.cardUrl,\n          waitingForInput: false,\n          task: structuredClone(task),\n        },\n      };\n    }\n\n    return {\n      text: textBuffer,\n      task,\n      suspended,\n    };\n  }\n\n  #createBufferedStreamResult({\n    runId,\n    result,\n    threadId,\n    resourceId,\n    emitStart,\n  }: {\n    runId: string;\n    result: A2AAgentGenerateResult;\n    threadId?: string;\n    resourceId?: string;\n    emitStart: boolean;\n  }): A2AAgentStreamResult {\n    const messageList = new MessageList({ threadId, resourceId });\n    const toolName = this.id;\n    const agentId = this.id;\n    const textId = resolveStreamTextId([result.message?.messageId, result.task?.id]);\n    if (result.text) {\n      messageList.add(\n        {\n          role: 'assistant',\n          content: result.text,\n        },\n        'response',\n      );\n    }\n\n    const fullStream = (async function* (): AsyncIterable<A2AAgentFullStreamChunk> {\n      if (emitStart) {\n        yield toAgentStreamChunk(runId, { type: 'start', payload: { id: agentId } });\n      }\n\n      if (result.text) {\n        yield toAgentStreamChunk(runId, { type: 'text-start', payload: { id: textId } });\n        yield toAgentStreamChunk(runId, { type: 'text-delta', payload: { id: textId, text: result.text } });\n        yield toAgentStreamChunk(runId, { type: 'text-end', payload: { id: textId } });\n      }\n\n      if (result.resumePayload) {\n        yield toAgentStreamChunk(runId, {\n          type: 'tool-call-suspended',\n          payload: {\n            toolCallId: runId,\n            toolName,\n            args: {},\n            suspendPayload: result.resumePayload,\n            resumeSchema: result.resumeSchema ?? createResumeSchema(),\n          },\n        });\n        return;\n      }\n\n      yield toAgentStreamChunk(runId, {\n        type: 'finish',\n        payload: createFinishPayload(),\n      });\n    })();\n\n    const streamResult = {\n      runId,\n      fullStream,\n      text: Promise.resolve(result.text),\n      toolResults: Promise.resolve([]),\n      messageList,\n      task: Promise.resolve(result.task),\n      suspendPayload: Promise.resolve(result.resumePayload),\n      resumeSchema: Promise.resolve(result.resumeSchema),\n      getResult: async () => result,\n    };\n\n    return streamResult as unknown as A2AAgentStreamResult;\n  }\n\n  async #request(\n    url: string,\n    { method = 'POST', headers = {}, body, stream = false, credentials, signal }: RequestOptions = {},\n  ): Promise<Response> {\n    let attempts = 0;\n    let lastError: unknown;\n\n    const finalHeaders = {\n      accept: stream ? 'text/event-stream' : 'application/json',\n      ...this.#headers,\n      ...headers,\n    };\n\n    while (attempts <= this.#retries) {\n      try {\n        const requestSignal = this.#resolveRequestSignal(signal);\n        const response = await this.#fetch(url, {\n          method,\n          headers: {\n            ...finalHeaders,\n            ...(body ? { 'content-type': 'application/json' } : {}),\n          },\n          body: body ? JSON.stringify(body) : undefined,\n          credentials: credentials ?? this.#credentials,\n          signal: requestSignal,\n        });\n\n        if (!response.ok) {\n          throw MastraA2AError.invalidAgentResponse(`Remote A2A request failed with status ${response.status}.`, {\n            status: response.status,\n            url,\n          });\n        }\n\n        return response;\n      } catch (error) {\n        lastError = error;\n\n        if (!shouldRetryRequest(error)) {\n          throw lastError;\n        }\n\n        if (attempts === this.#retries) {\n          break;\n        }\n\n        attempts += 1;\n        await this.#delay(attempts);\n      }\n    }\n\n    throw lastError;\n  }\n\n  async #delay(attempt: number = 0) {\n    const delayMs = Math.min(this.#backoffMs * Math.max(1, attempt), this.#maxBackoffMs);\n    if (delayMs <= 0) {\n      return;\n    }\n\n    await new Promise(resolve => setTimeout(resolve, delayMs));\n  }\n\n  #resolveRequestSignal(signal?: AbortSignal) {\n    if (this.#timeoutMs == null) {\n      return signal ?? this.#abortSignal;\n    }\n\n    const timeoutSignal = AbortSignal.timeout(this.#timeoutMs);\n    const signals = [signal, this.#abortSignal, timeoutSignal].filter(Boolean) as AbortSignal[];\n\n    if (signals.length === 0) {\n      return undefined;\n    }\n\n    return signals.length === 1 ? signals[0] : AbortSignal.any(signals);\n  }\n}\n\nfunction shouldRetryRequest(error: unknown): boolean {\n  if (error instanceof TypeError) {\n    return true;\n  }\n\n  if (error instanceof DOMException && error.name === 'AbortError') {\n    return true;\n  }\n\n  if (error instanceof Error && error.name === 'AbortError') {\n    return true;\n  }\n\n  const status =\n    typeof error === 'object' && error !== null && 'status' in error && typeof error.status === 'number'\n      ? error.status\n      : typeof error === 'object' &&\n          error !== null &&\n          'data' in error &&\n          typeof error.data === 'object' &&\n          error.data !== null &&\n          'status' in error.data &&\n          typeof error.data.status === 'number'\n        ? 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