deepseek-ai/deepseek-harness · error · UnknownPresetError

agent-presets: preset "${presetId}" not found (available: ${

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/preset/agent-presets/src/index.ts:218

    return await discoverPresets(this.resolvedRoots)
  }

  /**
   * Resolve one preset by id.
   *
   * A broken preset resolves — deleting one, reading one, and reporting one
   * all need the row — and the mounting paths refuse it AFTER resolution
   * through {@link resolveMountable}.
   * @param id - the preset id, or `undefined` for {@link defaultId}.
   * @returns the resolved preset.
   * @throws when no configured root supplies that id.
   */
  async resolve(id?: string): Promise<AgentPreset> {
    const wanted = id ?? this.defaultId
    const presets = await this.list()
    const found = presets.find(preset => preset.id === wanted)
    if (found === undefined) {
      throw new UnknownPresetError(wanted, presets.map(preset => preset.id))
    }
    return found
  }

  /**
   * Resolve one preset that is about to compose an agent, refusing a broken
   * one with its discovery-reported reason. Failing here rather than inside
   * the loader keeps the answer the same for every unloadable shape — ghost
   * directory, unparsable YAML, rowless list — and spends no mount attempt
   * on a composition discovery already read as unusable.
   * @param id - the preset id, or `undefined` for {@link defaultId}.
   * @returns the resolved, mountable preset.
   * @throws when the preset is unknown or discovery reports it broken.
   */
  private async resolveMountable(id?: string): Promise<AgentPreset> {
    const preset = await this.resolve(id)
    if (preset.broken !== undefined) {
      throw new PresetMountError(preset.id, preset.broken)

View on GitHub (pinned to b150a551b8)

Solutions

1. Use one of the listed available preset ids.

When it happens

Trigger: Thrown at packages/preset/agent-presets/src/index.ts:218 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/b27a127b265d8a27. Report an issue: GitHub.