deepseek-ai/deepseek-harness · error · SdkProtocolError

session/prompt returned no message id: ${JSON.stringify(resu

Error message

session/prompt returned no message id: ${JSON.stringify(result)}

What it means

Error "session/prompt returned no message id: ${JSON.stringify(result)}" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/sdk/client/src/client.ts:287

    const result = await this.request('initialize', { ...params })
    if (!isRecord(result) || !isRecord(result.serverInfo)
      || typeof result.serverInfo.name !== 'string' || typeof result.serverInfo.version !== 'string') {
      throw new SdkProtocolError(`initialize returned no server identity: ${JSON.stringify(result)}`)
    }
    return { serverInfo: { name: result.serverInfo.name, version: result.serverInfo.version } }
  }

  /**
   * Queue one prompt and return its durable inbox identity.
   * @param sessionId - target session; an unknown id creates it.
   * @param contentBlocks - the user message, sent verbatim.
   * @returns the queued message id.
   */
  async prompt(sessionId: string, contentBlocks: ContentBlock[]): Promise<string> {
    const params: SessionPromptParams = { sessionId, contentBlocks }
    const result = await this.request('session/prompt', { ...params })
    if (!isRecord(result) || typeof result.messageId !== 'string') {
      throw new SdkProtocolError(`session/prompt returned no message id: ${JSON.stringify(result)}`)
    }
    return result.messageId
  }

  /**
   * Send one JSON-RPC request and await its result.
   * @param method - the wire method name.
   * @param params - the params object; omitted params send `{}`.
   * @param timeoutMs - per-call override of {@link HarnessClientOptions.requestTimeoutMs}.
   * @returns the raw result; rejects with {@link JsonRpcResponseError} on a
   * protocol error response, {@link RequestTimeoutError} on timeout, and
   * {@link TransportClosedError} when the runtime is gone.
   */
  async request(method: string, params?: object, timeoutMs?: number): Promise<unknown> {
    this.start()
    // A dead runtime cannot answer; fail with process context instead of
    // writing into a destroyed pipe and hanging until the timeout.
    if (this.exitCode !== undefined || this.spawnError !== undefined) {

View on GitHub (pinned to b150a551b8)

Solutions

1. Check the server session/prompt implementation returns a message id; align SDK and server versions.

When it happens

Trigger: Thrown at packages/sdk/client/src/client.ts:287 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of deepseek-ai/deepseek-harness@b150a551b8 (2026-08-24). Data as JSON: /api/errors/016cacb7b81522c9. Report an issue: GitHub.