/**
 * Request-parameter passthrough (design/40). A deployment can set official provider params it wants but
 * core doesn't model as first-class fields (OpenAI `frequency_penalty`/`presence_penalty`/`top_p`/`seed`/
 * `logit_bias`; Anthropic `top_k`/`top_p`/`stop_sequences`; …) via `Model.extraBody`, and core merges them
 * into the brain's request body. Anchored at the **Model** level (not per-turn) so the serialized body
 * stays byte-stable across turns → the prefix cache holds (design/9/31).
 *
 * Symmetric: each brain owns its structural + tuning keys (`reserved`) and ALWAYS wins — `extraBody` can
 * only supply the long tail, never clobber `messages`/`tools`/`temperature`/etc. Stripping is the safety
 * enforcement (the brains are standalone-usable); `prepareTask` separately warns on a collision (it has
 * `onError`, the brain doesn't — council design/40).
 */
/** OpenAI request-body keys core owns; `extraBody` cannot override these. */
export declare const OPENAI_RESERVED: ReadonlySet<string>;
/** Anthropic request-body keys core owns; `extraBody` cannot override these. (Note the asymmetry vs
 *  OpenAI — e.g. `stop`/`stop_sequences` is NOT reserved here because the Anthropic brain never sets it.) */
export declare const ANTHROPIC_RESERVED: ReadonlySet<string>;
/** Reserved set for a model's API. */
export declare function reservedFor(api: string): ReadonlySet<string>;
/**
 * Merge `extraBody` into a brain's already-built request `body`, dropping any key the brain owns so core
 * always wins. Returns a NEW object (passthrough keys first, then core keys) when `extraBody` is set; the
 * exact `body` reference (no allocation, byte-identical serialization) when it isn't — so an existing
 * deployment with no `extraBody` is unaffected.
 */
export declare function applyExtraBody(body: Record<string, unknown>, extraBody: Record<string, unknown> | undefined, reserved: ReadonlySet<string>): Record<string, unknown>;
/** Names in `extraBody` that collide with a reserved (core-owned) key — for a load-time warning. */
export declare function reservedCollisions(extraBody: Record<string, unknown> | undefined, reserved: ReadonlySet<string>): string[];
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