linshenkx/prompt-optimizer · error · EvaluationValidationError

Function mode must not be empty.

Error message

Function mode must not be empty.

What it means

OptimizationError thrown by optimizeMessage when the model registry returns nothing for request.modelKey — the message-optimization counterpart of the 'Model not found' check in optimizePrompt. It fires after request validation but before template resolution.

Source

Thrown at packages/core/src/services/evaluation/service.ts:461

          error instanceof Error ? error : undefined
        )
      );
    }
  }

  /**
   * 验证评估请求
   */
  private validateRequest(request: EvaluationRequest): void {
    if (!request.evaluationModelKey?.trim()) {
      throw new EvaluationValidationError('Evaluation model key must not be empty.');
    }

    if (!request.mode) {
      throw new EvaluationValidationError('Evaluation mode configuration must not be empty.');
    }
    if (!request.mode.functionMode) {
      throw new EvaluationValidationError('Function mode must not be empty.');
    }
    if (!request.mode.subMode) {
      throw new EvaluationValidationError('Sub mode must not be empty.');
    }

    switch (request.type) {
      case 'result':
        if (!request.target?.workspacePrompt?.trim()) {
          throw new EvaluationValidationError('Workspace prompt must not be empty.');
        }
        this.validateTestCase(request.testCase, 'Result evaluation test case');
        this.validateSnapshot(request.snapshot, 'Result evaluation snapshot');
        if (request.snapshot.testCaseId !== request.testCase.id) {
          throw new EvaluationValidationError(
            'Result evaluation snapshot testCaseId must match testCase.id.'
          );
        }
        if (this.isImageText2ImageMode(request) && !this.hasSnapshotOutputMedia(request.snapshot)) {

View on GitHub (pinned to 3e677b1d9f)

Solutions

1. Validate the key against modelManager.listModels() before calling optimizeMessage.
2. Refresh the model list and re-select a valid model when the error occurs.
3. Await model-manager initialization before enabling message optimization in the UI.
4. Fall back to the first available model when the saved default is missing.

Example fix

// before
await promptService.optimizeMessage({ selectedMessageId: id, messages, modelKey: staleKey });

// after
const models = await modelManager.listModels();
const modelKey = models.some(m => m.key === staleKey) ? staleKey : models[0]?.key;
if (!modelKey) throw new Error('No models configured');
await promptService.optimizeMessage({ selectedMessageId: id, messages, modelKey });

if (!(await modelManager.getModel(request.modelKey))) throw new Error('Model not configured');

async function modelExists(modelManager: any, key: string): Promise<boolean> {
  return !!(await modelManager.getModel(key));
}

try { await svc.optimizeMessage(req); } catch (e) { if (e instanceof OptimizationError && e.message === 'Model not found') await refreshModels(); }

When it happens

Trigger: Calling optimizeMessage with a modelKey absent from the model manager: model deleted after selection, stale default, models not yet loaded, or key from another profile.

Common situations: Same as prompt-flow: deleted default model, imported settings referencing missing models, async model list races, key format mismatches.

Related errors

• Data must be an object
• Evaluation model key must not be empty.
• Sub mode must not be empty.
• Model ${provider} not found
• DATA_ERROR_CODES.ELECTRON_API_UNAVAILABLE

AI-assisted analysis of linshenkx/prompt-optimizer@3e677b1d9f (2026-08-27). Data as JSON: /api/errors/61aea6ed9c30eb3d. Report an issue: GitHub.