deepseek-ai/deepseek-harness · error · UnknownPresetError

agent-preset-not-found

agent-preset-not-found

Error message

agent-presets: preset "${presetId}" not found (available: ${available.join(', ') || 'none'})

What it means

Error "agent-presets: preset "${presetId}" not found (available: ${available.join(', ') || 'none'})" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/host/apiproxy/src/api-proxy.ts:338

/** Wrap an error result echoing the request's rpcId. */
function err<T>(request: RpcRequest<unknown>, error: RpcError): RpcResponse<T> {
  return { rpcId: request.rpcId, result: { ok: false, error } }
}

/**
 * The RPC refusal a preset failure becomes, or undefined when the failure is
 * about something else.
 *
 * Both the session-create path and the switch path can be handed the same two
 * failures, and a client that has to branch on the code needs them worded the
 * same from either.
 * @param request - the request being answered.
 * @param error - the thrown value.
 * @returns the refusal, or undefined when the caller should keep handling.
 */
function presetFailure(request: RpcRequest<unknown>, error: unknown): RpcResponse<never> | undefined {
  if (error instanceof UnknownPresetError) {
    return err(request, {
      code: 'agent-preset-not-found',
      message: error.message,
      details: { agentPreset: error.presetId, available: [...error.available] },
    })
  }
  if (error instanceof PresetMountError) {
    return err(request, {
      code: 'agent-preset-invalid',
      message: error.message,
      details: { agentPreset: error.presetId, reason: error.reason },
    })
  }
  return undefined
}

/** Simple async queue: core callbacks push, the AsyncIterable pulls; abort/return cleans up. */
class FrameQueue<F> {
  private buffer: F[] = []

View on GitHub (pinned to b150a551b8)

Solutions

1. Pick one of the available preset ids listed in the message, or compose the missing preset into the deployment.

When it happens

Trigger: Thrown at packages/host/apiproxy/src/api-proxy.ts:338 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/89a5f16f8b9bb776. Report an issue: GitHub.