The timeout travels the same channel as stop: configured per model in
completion_params.first_token_timeout (seconds), popped at the workflow
model-config boundary (_normalize_completion_params) into
ModelInstance.first_token_timeout, and read by DifyPreparedLLM to arm the
transport ContextVar around invoke_llm and invoke_llm_with_structured_output.
Invalid values (non-numeric, bool, non-positive) disable the gate.
Covers workflow and chatflow LLM-compatible nodes (llm, question classifier,
parameter extractor). The easy-UI model config converter drops the key
defensively so imported app configs never forward it to providers. No graphon
changes are required: the popped key never reaches graphon, and its retry
handler treats FirstTokenTimeoutError like any node failure.
L1nSn0w
de11f571b8