# CircuitZoo Router

Open the [circuits catalog](../../.agents/context/zoos/circuits-catalog.md) for
existing building blocks. Open
[add a circuit](../../.agents/context/zoos/add-circuit.md) only for implementation
work.

Circuits operate immediately on slots and may consume or replace state. Verify
feature introspection and arity, supported representations, modeled result
branches, public marking, and the matching test prefix:
`general/circuitzoo_api`, `general/circuitzoo_ent_swap`,
`general/circuitzoo_purification`, `general/circuitzoo_superdense`, or
`general/circuitzoo_fusion`.
