/**
 * The few things the interface states about a model without running one.
 *
 * Both of these are a line of arithmetic or a sentence of English, and both lived in engine.ts —
 * which imports the OpenAI SDK, execa and ts-morph through fifty-seven modules and costs 645ms to
 * load on a Raspberry Pi 5. The terminal needs them while it is drawing, not while it is working:
 * `/config` prints the sub-agent concurrency and `/agents` explains it, both synchronously inside
 * a render, so neither can wait on an await and neither should drag the engine in front of the
 * first frame.
 *
 * Separated for the same measured reason as tool-outcome.ts and sandbox-modes.ts, and re-exported
 * from engine.ts so nothing that already imports them from there had to change.
 */
/**
 * How many sub-agents may talk to the provider at once.
 *
 * Not how many may be requested — the model can ask for eight, and all eight still run. This is
 * how many are in flight simultaneously, and it exists because they share one account. Launching
 * eight at once against a rate-limited provider produced eight 429s and eight failures, and burned
 * 949k tokens returning nothing. Three at a time finishes the same work slightly later and
 * actually finishes it.
 */
export declare const AGENT_CONCURRENCY = 3;
/** The widest a shared account has been seen to tolerate; past this, 429s are the usual outcome. */
export declare const MAX_AGENT_CONCURRENCY = 8;
/**
 * How many sub-agents to run at once, honouring the user's setting.
 *
 * Three is a default, not a truth: a free tier may not sustain even that, while a generous
 * enterprise key runs eight comfortably. Nonsense is ignored rather than passed to the pool, where
 * a zero would stall the fan-out and a negative would throw.
 */
export declare function resolveAgentConcurrency(requested: number | undefined): number;
/** Said once per session when the chosen model cannot call tools at all. */
export declare function toolsUnsupportedNotice(model: string): string;
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