microsoft/autogen · error · Error

Failed to validate component

Error message

Failed to validate component

What it means

Thrown by ValidationAPI.validateComponent when POST /validate/ returns a non-2xx status. The server's own message is preferred when present; this string is the fallback. It means the component config (e.g. an LLM config or tool config JSON) failed server-side validation.

Source

Thrown at python/packages/autogen-studio/frontend/src/components/views/teambuilder/api.ts:93

}

// move validationapi to its own class

export class ValidationAPI extends BaseAPI {
  async validateComponent(
    component: Component<ComponentConfig>
  ): Promise<ValidationResponse> {
    const response = await fetch(`${this.getBaseUrl()}/validate/`, {
      method: "POST",
      headers: this.getHeaders(),
      body: JSON.stringify({
        component: component,
      }),
    });

    const data = await response.json();
    if (!response.ok) {
      throw new Error(data.message || "Failed to validate component");
    }

    return data;
  }

  async testComponent(
    component: Component<ComponentConfig>,
    timeout: number = 60
  ): Promise<ComponentTestResult> {
    const response = await fetch(`${this.getBaseUrl()}/validate/test`, {
      method: "POST",
      headers: this.getHeaders(),
      body: JSON.stringify({
        component: component,
        timeout: timeout,
      }),
    });

View on GitHub (pinned to 027ecf0a37)

Solutions

1. Inspect the thrown error message: it prefers data.message from the server, which names the actual invalid field.
2. Compare the component's config against a working built-in component of the same type.
3. POST the same payload to /api/validate/ with curl to see the full response body.
4. Check backend logs if the response is a bare 500 with no message.

// Cheap client-side pre-checks before calling the server
const required = ['config', 'component_type'];
const missing = required.filter((k) => component[k] == null);
if (missing.length) throw new Error(`Component missing fields: ${missing.join(', ')}`);
if (component.component_type === 'llm' && !component.config?.config_list?.length) {
  throw new Error('LLM component requires a non-empty config_list');
}

const isComponent = (c: unknown): c is Component<ComponentConfig> =>
  typeof c === 'object' && c !== null && 'component_type' in c && 'config' in c;

try {
  const result = await validationAPI.validateComponent(component);
  if (!result.isValid) showFieldErrors(result.errors);
} catch (e) {
  // e.message carries the server-side reason when available
  setError(e instanceof Error ? e.message : 'Validation request failed');
}

When it happens

Trigger: Calling validationAPI.validateComponent(component) with a component whose config is malformed server-side: missing required fields (e.g. no model or api_key in an OpenAIConfig), wrong component_type, invalid JSON schema of config, or a 500 from the validate route. The message only appears when the error response body has no message field.

Common situations: Building a custom component in the Team Builder whose config omits required keys; pasting component JSON from an incompatible AutoGen Studio version; backend validation route crashing on an unexpected component_type.

Related errors

• Failed to delete team
• Failed to test component
• Failed to list MCP tools
• Failed to call MCP tool
• HTTP ${response.status}: ${errorText || "Failed to create We

AI-assisted analysis of microsoft/autogen@027ecf0a37 (2026-08-15). Data as JSON: /api/errors/5d5f06ad777cf901. Report an issue: GitHub.