crewAIInc/crewAI · error · A2AClientHTTPError

Could not validate auth against AgentCard security requireme

Error message

Could not validate auth against AgentCard security requirements

What it means

Error "Could not validate auth against AgentCard security requirements" thrown in crewAIInc/crewAI.

Source

Thrown at lib/crewai/src/crewai/a2a/auth/utils.py:191

        if not security_scheme_wrapper:
            continue

        scheme = security_scheme_wrapper.root

        if allowed_classes := _SCHEME_AUTH_MAPPING.get(type(scheme)):
            if not isinstance(auth, allowed_classes):
                _raise_auth_mismatch(allowed_classes, auth)
            return

        if isinstance(scheme, HTTPAuthSecurityScheme):
            scheme_key = cast(_HTTPSchemeType, scheme.scheme.lower())
            if required_class := _HTTP_SCHEME_MAPPING.get(scheme_key):
                if not isinstance(auth, required_class):
                    _raise_auth_mismatch(required_class, auth)
            return

    msg = "Could not validate auth against AgentCard security requirements"
    raise A2AClientHTTPError(401, msg)


async def retry_on_401(
    request_func: Callable[[], Awaitable[Response]],
    auth_scheme: ClientAuthScheme | None,
    client: AsyncClient,
    headers: MutableMapping[str, str],
    max_retries: int = 3,
) -> Response:
    """Retry a request on 401 authentication error.

    Handles 401 errors by:
    1. Parsing WWW-Authenticate header
    2. Re-acquiring credentials
    3. Retrying the request

    Args:
        request_func: Async function that makes the HTTP request.

View on GitHub (pinned to 754d7323be)

Solutions

1. Ensure the provided credentials satisfy one of the AgentCard's security requirement alternatives.
2. Check that the auth scheme name matches a scheme declared in the AgentCard.

When it happens

Trigger: Thrown at lib/crewai/src/crewai/a2a/auth/utils.py:191 when the library encounters an invalid state.

Common situations: Occurs when the provided credentials cannot satisfy any of the AgentCard's security requirements. Check that the credentials match one of the declared security schemes.

AI-assisted analysis of crewAIInc/crewAI@754d7323be (2026-08-15). Data as JSON: /api/errors/13748f66929c857a. Report an issue: GitHub.