Single functions - a calculator, a search, a SQL runner - with typed inputs.
Tools are the concrete actions a model or agent can take, described so the router knows when to reach for them. Wire them into your own agents or let a plan call them when a request needs a real computation, not a guess.
PaymentOracle — ES256K-signed receipts for x402 payments on USDC+EURC (Base) and XRP+RLUSD (XRPL).
