deepseek-ai/deepseek-harness · error · Error

no adapter registered for provider "${this.provider}"

Error message

no adapter registered for provider "${this.provider}"

What it means

Error "no adapter registered for provider "${this.provider}"" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/sdk/server/src/server.ts:121

    }))
  }

  /**
   * Configure the SDK route, mounting the DeepSeek fallback only when unowned.
   * @param params - SDK handshake parameters.
   * @returns server identity for the handshake.
   */
  async initialize(params: InitializeParams): Promise<InitializeResult> {
    if (params.maxTokens !== undefined
      && (!Number.isSafeInteger(params.maxTokens) || params.maxTokens <= 0)) {
      throw new TypeError('initialize maxTokens must be a positive safe integer')
    }
    this.cwd = resolve(params.cwd)
    this.provider = params.provider
    this.model = params.model
    this.maxTokens = params.maxTokens
    if (!this.hasAdapterFor(this.provider)) {
      if (this.provider !== 'deepseek-official') throw new Error(`no adapter registered for provider "${this.provider}"`)
      this.llmFiber = await this.ctx.plugin(LlmDeepSeek, {})
    }
    return { serverInfo: { name: 'deepseek-harness-sdk-runtime', version: '0.0.1' } }
  }

  /**
   * Queue one identified prompt without assigning later activity to it.
   * @param params - target session and user content.
   * @returns the durable message identity.
   */
  async prompt(params: SessionPromptParams): Promise<SessionPromptResult> {
    const rec = await this.getOrCreateSession(params.sessionId)
    // An agent-loop-only reload disposes the loop's agents while this record
    // survives; a retained agent accepts followup() silently, so validate the
    // record against the live registry before delivery (as the ACP bridge does).
    if (this.ctx.agents.get(rec.handle.agent.id) !== rec.handle.agent) {
      throw new Error(`session agent was disposed outside the server: ${params.sessionId}`)
    }

View on GitHub (pinned to b150a551b8)

Solutions

1. Register an adapter for the provider before creating a session, or select a provider with a registered adapter.

When it happens

Trigger: Thrown at packages/sdk/server/src/server.ts:121 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/1b3a390add95f9f4. Report an issue: GitHub.