deepseek-ai/deepseek-harness · error · PresetMountError

agent-preset-invalid

agent-preset-invalid

Error message

agent-presets: preset "${presetId}" failed to mount: ${reason}

What it means

Error "agent-presets: preset "${presetId}" failed to mount: ${reason}" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/host/apiproxy/src/api-proxy.ts:345

 * 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[] = []
  private waiter: (() => void) | undefined
  private done = false

  push(item: F): void {
    if (this.done) return
    this.buffer.push(item)
    this.waiter?.()

View on GitHub (pinned to b150a551b8)

Solutions

1. Fix the preset's cordis.yml or bundle per the embedded mount failure reason, then retry.

When it happens

Trigger: Thrown at packages/host/apiproxy/src/api-proxy.ts:345 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/dd256f64ef141485. Report an issue: GitHub.