/** Provider-neutral behaviour metadata for tools and mutating actions. */
export type ToolRetryClass = "safe" | "safe-after-read" | "manual" | "never";
export interface ToolBehavior {
    readonly readOnly: boolean;
    readonly destructive: boolean;
    readonly idempotent: boolean;
    readonly openWorld: boolean;
    readonly reversible: boolean;
    readonly requiresExplicitOperatorRestrictionCheck: boolean;
    readonly retryClass: ToolRetryClass;
}
export type ActionImpact = "read" | "local-mutation" | "external-mutation" | "destructive";
export type Idempotency = "idempotent" | "conditional" | "non-idempotent";
export interface RetryPolicy {
    readonly maxAttempts: number;
    readonly backoffMs?: number;
    readonly stopOnEquivalentFailure?: boolean;
}
export interface ResourceIdentity {
    readonly kind: string;
    readonly id: string;
    readonly revision?: string;
}
/** A validation/evidence contract, never an approval request. */
export interface ActionContract {
    readonly target: ResourceIdentity;
    readonly impact: ActionImpact;
    readonly idempotency: Idempotency;
    readonly reversible: boolean;
    readonly openWorld: boolean;
    readonly retryPolicy: RetryPolicy;
    readonly preconditions: readonly string[];
    readonly requiredEvidence: readonly string[];
}
export declare const DEFAULT_RETRY_POLICY: RetryPolicy;
export declare function behaviorFromContract(contract: ActionContract): ToolBehavior;
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