Oracle is the consult-a-stronger-model move packaged as a tool. A cheaper model does the bulk of the work and pings the oracle only on the hard calls (sonnet to opus, gpt-5.4-mini to gpt-5.5), so you pay premium for the 10% that actually needs it. Adversarial review and final pre-merge checks go through the same door.
In Claude Code you get two flavours: the native /advisor, and the /oracle skill, which wraps the oracle CLI with prompt and file bundling. This is the routing half of the Token Optimisation Playbook: cheap drives, premium consults.
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