/**
 * Bridges Bedrock's native `BedrockMessage[]` conversation shape and
 * `AgenticLoopChunk` stream to the AI SDK V3 model-middleware protocol
 * (`LanguageModelV3`), so `BaseProvider.applyMiddlewareToModel()` can wrap a
 * turn built entirely out of `runAgenticLoop` — the same engine Bedrock's
 * `generate()` and `executeStream()` already run on.
 *
 * Scope: only the conversation `generate()`/`executeStream()` hand to the
 * loop as its STARTING point ever crosses this boundary. Both reset
 * `conversationHistory` to a single fresh message before calling the loop
 * (see `client.ts`), so that starting point is always `system + one user
 * message` — never prior assistant/tool-result turns, which are constructed
 * entirely inside the loop's own steps and stay in native
 * `BedrockMessage[]`/`ConverseCommand` shape. A general, lossless
 * `BedrockMessage` <-> `ModelMessage` converter is not attempted here, and
 * would not be possible anyway: `BedrockToolResult` carries no `toolName`,
 * which a faithful `ToolModelMessage` requires.
 *
 * Further scoped to TEXT-ONLY turns. A multimodal starting message (image,
 * document, or — pathologically — a tool-use/tool-result block) skips
 * wrapping entirely; the caller checks `isTextOnlyBedrockConversation` and
 * falls back to calling the loop directly, logging that the turn was
 * excluded. This mirrors the plan's AI Studio precedent: an excluded shape
 * must be explicit in code, not implied by no test ever sending one.
 *
 * Who owns the outcome. When the wrapped `doGenerate`/`doStream` ran the loop,
 * the loop's own result is authoritative for `finishReason`, `usage`,
 * `toolExecutions` and the final conversation: a middleware may replace the
 * content or the stream parts a caller sees, but it cannot rewrite the
 * metadata of a turn that already reached the wire. When a middleware never
 * calls through (a cache hit, a refusal, a synthetic answer) no loop ran, and
 * its own V3 result is what gets reported.
 */
import type { ToolInputSchema } from "@aws-sdk/client-bedrock-runtime";
import type { AgenticLoopChunk, BedrockMessage, LanguageModelV3CallOptions, LanguageModelV3StreamPart, ModelMessage } from "../../types/index.js";
/** Names of the unsent options `params` carries; an empty list counts as unset. */
export declare function unsentBedrockMiddlewareOptions(params: LanguageModelV3CallOptions): string[];
/**
 * Unwrap Bedrock's `ToolSpecification.inputSchema` — always `{ json:
 * DocumentType }` on the wire (see `ToolInputSchema.JsonMember` in the AWS
 * SDK), never the bare schema — to the plain JSON schema object the V3 tool
 * shape's `inputSchema` field expects. `client.ts`'s own tool-formatting path
 * (`formatToolsForBedrock`) always sends `{ json: schema }` to AWS for this
 * exact reason; handing a middleware the wrapper itself instead of the
 * schema breaks any schema-inspecting middleware (e.g. a guardrail
 * validating tool arguments against the declared shape).
 */
export declare function unwrapBedrockToolInputSchema(inputSchema: ToolInputSchema | undefined): unknown;
/** True when every content block of every message is plain text. */
export declare function isTextOnlyBedrockConversation(conversation: BedrockMessage[]): boolean;
/**
 * `system` + the (already text-only) starting conversation, as a V3 prompt.
 * The system prompt is always sent as its own leading message — Bedrock
 * carries it out-of-band (`ConverseCommandInput.system`), but the V3 prompt
 * shape has no separate slot, so `bedrockConversationFromV3Prompt` is the
 * inverse that pulls it back out.
 */
export declare function buildV3PromptFromBedrock(systemPrompt: string, conversation: BedrockMessage[]): ModelMessage[];
/**
 * Inverse of `buildV3PromptFromBedrock`, read AFTER `transformParams` has
 * run — this is what makes a middleware's prompt rewrite (correction 1)
 * reach the wire: the caller passes the ORIGINAL prompt into `doGenerate`/
 * `doStream`, and by AI SDK contract `transformParams` has already produced
 * the version handed to the closure by the time this runs.
 *
 * A `tool` role message has no faithful Bedrock shape at this boundary (no
 * toolUseId/toolName pairing survives `ToolModelMessage`), so one is
 * dropped with a WARN rather than guessed at. The starting turn Bedrock
 * ever hands across this boundary never contains one; seeing one here means
 * middleware injected it.
 */
export declare function bedrockConversationFromV3Prompt(prompt: ModelMessage[]): {
    system: string;
    conversation: BedrockMessage[];
};
/**
 * Wrap a native `AgenticLoopChunk` source into the V3 stream contract, one
 * chunk at a time, forwarding cancellation to both the source iterator and
 * `cancel` (which the caller wires to the turn's own `AbortController`, so
 * breaking out of a wrapped stream tears down the underlying AWS SDK
 * request — correction 4). `finish` resolves the terminal `finish` part
 * once the loop settles; middleware inspecting the returned stream sees a
 * genuine usage-bearing finish part even when nothing downstream reads it
 * back out (a guardrail that blocks before calling `doStream` never
 * produces this stream at all, which is the `!loopPromise` case its own
 * caller handles).
 */
export declare function bedrockChunksToV3Stream(source: AsyncIterable<AgenticLoopChunk>, finish: Promise<LanguageModelV3StreamPart>, cancel: () => void): ReadableStream<LanguageModelV3StreamPart>;
/**
 * Inverse of `bedrockChunksToV3Stream`: drains a (possibly
 * middleware-wrapped) V3 stream back into Bedrock's native chunk shape.
 * `finish`/`error` parts are consumed here but not surfaced as chunks —
 * `streamingConversationLoop` reads the turn's outcome from the loop's own
 * `resultPromise`, which already carries richer usage/finishReason/
 * toolExecutions than a V3 finish part does; this function exists only to
 * satisfy the wrapped stream's own contract (a middleware may expect its
 * returned stream to be drained to completion) and to `throw` a middleware
 * `error` part into the consumer.
 */
export declare function bedrockV3StreamToChunks(stream: ReadableStream<LanguageModelV3StreamPart>): AsyncIterable<AgenticLoopChunk>;