@modelcontextprotocol/sdk
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    Variable ProgressNotificationSchemaConst

    ProgressNotificationSchema: ZodObject<
        extendShape<
            {
                method: ZodString;
                params: ZodOptional<
                    ZodObject<
                        { _meta: ZodOptional<ZodRecord<ZodString, ZodUnknown>> },
                        "passthrough",
                        ZodTypeAny,
                        objectOutputType<
                            { _meta: ZodOptional<ZodRecord<ZodString, ZodUnknown>> },
                            ZodTypeAny,
                            "passthrough",
                        >,
                        objectInputType<
                            { _meta: ZodOptional<ZodRecord<ZodString, ZodUnknown>> },
                            ZodTypeAny,
                            "passthrough",
                        >,
                    >,
                >;
            },
            {
                method: ZodLiteral<"notifications/progress">;
                params: ZodObject<
                    extendShape<
                        extendShape<
                            { _meta: ZodOptional<ZodRecord<ZodString, ZodUnknown>> },
                            {
                                message: ZodOptional<ZodString>;
                                progress: ZodNumber;
                                total: ZodOptional<ZodNumber>;
                            },
                        >,
                        { progressToken: ZodUnion<[ZodString, ZodNumber]> },
                    >,
                    "strip",
                    ZodTypeAny,
                    {
                        _meta?: Record<string, unknown>;
                        message?: string;
                        progress: number;
                        progressToken: string | number;
                        total?: number;
                    },
                    {
                        _meta?: Record<string, unknown>;
                        message?: string;
                        progress: number;
                        progressToken: string | number;
                        total?: number;
                    },
                >;
            },
        >,
        "strip",
        ZodTypeAny,
        {
            method: "notifications/progress";
            params: {
                _meta?: Record<string, unknown>;
                message?: string;
                progress: number;
                progressToken: string | number;
                total?: number;
            };
        },
        {
            method: "notifications/progress";
            params: {
                _meta?: Record<string, unknown>;
                message?: string;
                progress: number;
                progressToken: string | number;
                total?: number;
            };
        },
    > = ...

    An out-of-band notification used to inform the receiver of a progress update for a long-running request.