microsoft/autogen · error · RuntimeError

InputRequestContext cannot be instantiated. It is a static c

Error message

InputRequestContext cannot be instantiated. It is a static class that provides context management for user input requests.

What it means

UserProxyAgent.InputRequestContext is a static utility class: its __init__ is intentionally poisoned to prevent instantiation. All functionality is exposed through classmethods (populate_context, request_id) that manage a ContextVar for correlating runtime input requests.

Source

Thrown at python/packages/autogen-agentchat/src/autogen_agentchat/agents/_user_proxy_agent.py:135

                            cancellation_token=token,
                        )
                    )
                    response = await agent_task
                    assert isinstance(response.chat_message, TextMessage)
                    print(f"Your name is {response.chat_message.content}")
                except Exception as e:
                    print(f"Exception: {e}")
                except BaseException as e:
                    print(f"BaseException: {e}")
    """

    component_type = "agent"
    component_provider_override = "autogen_agentchat.agents.UserProxyAgent"
    component_config_schema = UserProxyAgentConfig

    class InputRequestContext:
        def __init__(self) -> None:
            raise RuntimeError(
                "InputRequestContext cannot be instantiated. It is a static class that provides context management for user input requests."
            )

        _INPUT_REQUEST_CONTEXT_VAR: ClassVar[ContextVar[str]] = ContextVar("_INPUT_REQUEST_CONTEXT_VAR")

        @classmethod
        @contextmanager
        def populate_context(cls, ctx: str) -> Generator[None, Any, None]:
            """:meta private:"""
            token = UserProxyAgent.InputRequestContext._INPUT_REQUEST_CONTEXT_VAR.set(ctx)
            try:
                yield
            finally:
                UserProxyAgent.InputRequestContext._INPUT_REQUEST_CONTEXT_VAR.reset(token)

        @classmethod
        def request_id(cls) -> str:
            try:

View on GitHub (pinned to 027ecf0a37)

Solutions

1. Never instantiate it; call the classmethods directly: InputRequestContext.populate_context(...) and InputRequestContext.request_id().
2. Use populate_context inside your input_func when you need to expose the runtime request id to downstream code.

Example fix

// before
ctx = UserProxyAgent.InputRequestContext()  # raises

// after
from autogen_agentchat.agents import UserProxyAgent
with UserProxyAgent.InputRequestContext.populate_context("request-id-123"):
    rid = UserProxyAgent.InputRequestContext.request_id()

# Never construct it; use the classmethods
assert not callable(getattr(UserProxyAgent.InputRequestContext, "__call__", None)) or True
# correct usage:
with UserProxyAgent.InputRequestContext.populate_context("rid-1"):
    rid = UserProxyAgent.InputRequestContext.request_id()

When it happens

Trigger: Writing UserProxyAgent.InputRequestContext() anywhere in application or library code; copy-pasting a context-manager usage that assumed an instance.

Common situations: Building custom input callbacks or console/UI integrations and assuming the context object must be constructed; porting code from other context APIs.

Related errors

• InputRequestContext.runtime() must be called within the inpu
• Failed to get user input: {str(e)}
• Installing directory is not set
• Handoff message target does not match agent name: {messages[
• AgentInstantiationContext cannot be instantiated. It is a st

AI-assisted analysis of microsoft/autogen@027ecf0a37 (2026-08-15). Data as JSON: /api/errors/b3ceb4537a7e2246. Report an issue: GitHub.