@modelcontextprotocol/sdk
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    Variable ProgressNotificationSchemaConst

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

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