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.
Polski software house B2B: 5 public + 7 OAuth 2.1 private MCP tools (AI estimate, draft, risk).
