The /v1/messages validator checked a tool_use block's name and id but not its
input, so a block whose location came back empty or wrong still passed, while
the chat side rejected the same damage. That gap predates this branch; it is
worth closing here because the point of the change is that every parallel call
is checked rather than counted.
AnthropicContentBlock now declares input as a typed field. It already survived
on extra="allow", but reaching it from a test needs a real field to keep the
e2e basedpyright gate at zero. Serialization is unchanged: bodies are dumped
with exclude_none, so a block without an input still replays exactly as before.
The together backend is picked as the cheapest chat row that supports both
tools and reasoning, which currently resolves to together_ai/openai/gpt-oss-120b.
That row is marked supports_parallel_function_calling, so one weather prompt
can legitimately come back as several get_weather calls. Both tool tests
asserted exactly one call, so a parallel answer failed them even though the
gateway handled it correctly.
They now check every returned call instead of counting them: each one has to
be a get_weather naming Paris, with an id a tool result can answer. Dropping,
misnaming, or mangling a call is still red; only the count is the model's
business. The round trips answer every call rather than just the first, which
is also what the Anthropic Messages spec asks for.
