Rule Router

The rule router assigns AND-ed conditions to each outgoing edge; the first matching edge in document order wins. If none match, a mandatory "else" edge fires. It uses a safe fixed field+operator catalog, not free-form expressions.

Available signals

input_chars

Character count of the input text (length).

message_count

Number of messages in the conversation.

has_vision

Whether the request includes images.

has_tools

Whether the request includes tool/function definitions.

stream

Whether it is a streaming request.

plan

The user's subscription plan.

username

The requesting user.

# document order — first match wins
if has_vision == true                    → vision-model
if input_chars >= 8000 AND plan == "pro" → big-context-model
else                                     → default-model