model-unavailable

model-unavailable

Error message

no adapter serves provider "${selection.provider}"; select a model for this session

What it means

Error "no adapter serves provider "${selection.provider}"; select a model for this session" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/host/apiproxy/src/api-proxy.ts:1800

  /**
   * Resolve the addressed agent for a turn-starting method and refuse when no
   * adapter serves its current selection: a provider nothing serves cannot start a
   * turn, and letting it try spends the whole pre-step path to fail inside
   * the adapter with a message about registration. Refusing here names the
   * model the session is pointed at while the draft is still in the composer.
   * This is `session.prompt`'s enforcement boundary: a client that disables
   * its input is an affordance, and the method stays callable regardless.
   */
  async function turnAgentFor<T>(
    request: RpcRequest<unknown>, sessionId: SessionId,
  ): Promise<{ agent: Agent } | { refused: RpcResponse<T> }> {
    const found = await agentFor(sessionId)
    if ('error' in found) return { refused: err(request, found.error) }
    const agent = found.agent
    const selection = selectionFor(agent).current
    if (!routeServed(selection.provider)) {
      return {
        refused: err(request, {
          code: 'model-unavailable',
          message: `no adapter serves provider "${selection.provider}"; select a model for this session`,
          details: { provider: selection.provider, model: selection.model },
        }),
      }
    }
    return { agent }
  }

  /** Missing-service report shared by the settings domain (skills-domain stance). */
  function settingsAbsent(): RpcError {
    return { code: 'internal', message: 'settings service is absent: this deployment does not mount a settings provider (e.g. @deepseek-ai/dsh-settings-file) in its composition', details: {} }
  }

  /** Open one Host-resolved target and map native failures onto the wire vocabulary. */
  async function openTarget(
    request: RpcRequest<unknown>, path: string, signal: AbortSignal,
    open: (path: string, signal: AbortSignal) => Promise<void>,

View on GitHub (pinned to b150a551b8)

Solutions

Select a model for the session whose provider has a registered adapter, or compose an adapter for the provider.

When it happens

Trigger: Thrown at packages/host/apiproxy/src/api-proxy.ts:1800 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/049169163e3cad13. Report an issue: GitHub.