03/Flow Routing

Rule Router

Deterministic if-then branching on request features.

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.

rule router

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

Entry

routerRuleif-then

Vision

Big context

Default

Every rule router must have exactly one "else" edge. Both the panel and the backend enforce this — so a request is never left unrouted.