BerriAI/litellm · error · RuntimeError

A2A send_message_streaming failed: no response received afte

Error message

A2A send_message_streaming failed: no response received after retry attempts.

What it means

Error "A2A send_message_streaming failed: no response received after retry attempts." thrown in BerriAI/litellm.

Source

Thrown at litellm/a2a_protocol/main.py:375

            card_url = get_agent_card_url(agent_card) if agent_card else None
            continue
        except Exception as e:
            if response_started:
                raise
            try:
                map_a2a_exception(e, card_url, api_base, model=agent_name)
            except A2ALocalhostURLError as localhost_err:
                a2a_client = await handle_a2a_localhost_retry(
                    error=localhost_err,
                    agent_card=agent_card,
                    a2a_client=a2a_client,
                    is_streaming=True,
                )
                card_url = get_agent_card_url(agent_card) if agent_card else None
                continue
            raise
    if not stream_succeeded:
        raise RuntimeError("A2A send_message_streaming failed: no response received after retry attempts.")


@client
async def asend_message(
    a2a_client: Optional["A2AClientType"] = None,
    request: Optional["SendMessageRequest"] = None,
    api_base: str | None = None,
    litellm_params: dict[str, object] | None = None,
    agent_id: str | None = None,
    agent_extra_headers: dict[str, str] | None = None,
    **kwargs: object,
) -> LiteLLMSendMessageResponse:
    """
    Async: Send a message to an A2A agent.

    Uses the @client decorator for LiteLLM logging and tracking.
    If litellm_params contains custom_llm_provider, routes through the completion bridge.

View on GitHub (pinned to 6c2dcb801b)

Solutions

1. The agent did not stream a response after retries; check agent availability and streaming support.

When it happens

Trigger: Thrown at litellm/a2a_protocol/main.py:375 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of BerriAI/litellm@6c2dcb801b (2026-08-15). Data as JSON: /api/errors/8475320a69731d5b. Report an issue: GitHub.