deepseek-ai/deepseek-harness · error · SdkProtocolError

initialize returned no server identity: ${JSON.stringify(res

Error message

initialize returned no server identity: ${JSON.stringify(result)}

What it means

Error "initialize returned no server identity: ${JSON.stringify(result)}" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/sdk/client/src/client.ts:272

      // will never be answered.
      this.transport?.close()
    })
    const transport = new JsonRpcLineTransport(child.stdout, child.stdin)
    transport.onNotification((method, params) => { this.dispatchNotification({ method, params }) })
    transport.start()
    this.transport = transport
  }

  /**
   * Perform the process-wide handshake.
   * @param params - workspace cwd plus the provider/model route.
   * @returns the runtime's wire identity.
   */
  async initialize(params: InitializeParams): Promise<InitializeResult> {
    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
  }

View on GitHub (pinned to b150a551b8)

Solutions

1. Verify the server implements initialize correctly and returns its identity; check SDK/server version compatibility.

When it happens

Trigger: Thrown at packages/sdk/client/src/client.ts:272 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/8c791975a90289e7. Report an issue: GitHub.