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Python: [Bug]: hosting-responses rejects input messages that omit "type" #9123
Description
Description
messages_from_responses_input in agent_framework_hosting_responses/_parsing.py only treats an input item as a message when it has "type": "message". In the OpenAI Responses API type is optional on message items (EasyInputMessage), and the OpenAI SDK sends the common shorthand without it:
client.responses.create(model=..., input=[
{"role": "developer", "content": "Talk like a pirate."},
{"role": "user", "content": "Are semicolons optional?"},
])The hosting app rejects that request with HTTP 400:
from agent_framework_hosting_responses._parsing import messages_from_responses_input
messages_from_responses_input([
{"role": "developer", "content": "Talk like a pirate."},
{"role": "user", "content": "Are semicolons optional?"},
])
# ValueError: Unsupported Responses input content type: NoneWith "type": "message" added to each item it works.
Expected
An item with a role and no type is parsed as a message, the same as "type": "message".
Package Versions
agent-framework-hosting-responses on main (279d97f)
Python Version
3.12
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github-actions commentedon Oct 6, 2026
🤖 Automated triage reproduction notes (agent-authored — trust but verify)
Agent analysis
python/packages/hosting-responses/agent_framework_hosting_responses/_parsing.py::messages_from_responses_inputat lines 150-175 rejects list items containingroleandcontentwhentypeis omitted, ultimately raising at line 125. Minimal repro: call the function with[{"role": "developer", "content": "Talk like a pirate."}, {"role": "user", "content": "Are semicolons optional?"}].python/packages/hosting-responses/tests/hosting_responses/test_parsing.py::TestMessagesFromResponsesInput::test_message_without_type_with_string_contentmain (279d97f7)1.0.0a261002