import type { TSchema } from "typebox";
import type { Backend, SpawnConfig, StructuredSource } from "../backend.js";
import type { RegisteredBackend } from "../registry.js";
export declare class CustomAcpBackend implements Backend {
    private readonly config;
    readonly id: string;
    /** id + spawn-config hash: two registries (e.g. two scripts' `meta.backends`) may declare
     *  the SAME name with DIFFERENT commands — the pool must never share a process across them. */
    readonly poolKey: string;
    /** The agent may ignore the `_meta.outputSchema` forward, so the runner must also state the
     *  schema in the prompt — otherwise the model returns JSON with keys it invented and the
     *  repair ladder can never converge on a contract the model was never shown. */
    readonly embedSchemaInPrompt = true;
    readonly injectStructuredOutputTool: boolean;
    readonly customCapabilities?: NonNullable<Backend["customCapabilities"]>;
    constructor(config: RegisteredBackend);
    spawnConfig(): SpawnConfig;
    sessionMetaDefaults(): Record<string, unknown> | undefined;
    sessionMeta(_schema: TSchema | undefined): Record<string, unknown> | undefined;
    promptMeta(schema: TSchema | undefined): Record<string, unknown> | undefined;
    nativeStructured(source: StructuredSource): unknown;
}
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