MCP TypeScript SDK
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    Variable SamplingMessageSchemaConst

    SamplingMessageSchema: ZodObject<
        {
            _meta: ZodOptional<ZodRecord<ZodString, ZodUnknown>>;
            content: ZodUnion<
                readonly [
                    ZodDiscriminatedUnion<
                        [
                            ZodObject<
                                {
                                    _meta: ZodOptional<ZodRecord<ZodString, ZodUnknown>>;
                                    annotations: ZodOptional<
                                        ZodObject<
                                            { audience: ...; lastModified: ...; priority: ... },
                                            $strip,
                                        >,
                                    >;
                                    text: ZodString;
                                    type: ZodLiteral<"text">;
                                },
                                $strip,
                            >,
                            ZodObject<
                                {
                                    _meta: ZodOptional<ZodRecord<ZodString, ZodUnknown>>;
                                    annotations: ZodOptional<
                                        ZodObject<
                                            { audience: ...; lastModified: ...; priority: ... },
                                            $strip,
                                        >,
                                    >;
                                    data: ZodString;
                                    mimeType: ZodString;
                                    type: ZodLiteral<"image">;
                                },
                                $strip,
                            >,
                            ZodObject<
                                {
                                    _meta: ZodOptional<ZodRecord<ZodString, ZodUnknown>>;
                                    annotations: ZodOptional<
                                        ZodObject<
                                            { audience: ...; lastModified: ...; priority: ... },
                                            $strip,
                                        >,
                                    >;
                                    data: ZodString;
                                    mimeType: ZodString;
                                    type: ZodLiteral<"audio">;
                                },
                                $strip,
                            >,
                            ZodObject<
                                {
                                    _meta: ZodOptional<ZodRecord<ZodString, ZodUnknown>>;
                                    id: ZodString;
                                    input: ZodRecord<ZodString, ZodUnknown>;
                                    name: ZodString;
                                    type: ZodLiteral<"tool_use">;
                                },
                                $strip,
                            >,
                            ZodObject<
                                {
                                    _meta: ZodOptional<ZodRecord<ZodString, ZodUnknown>>;
                                    content: ZodDefault<ZodArray<ZodUnion<(...)>>>;
                                    isError: ZodOptional<ZodBoolean>;
                                    structuredContent: ZodOptional<ZodObject<{}, $loose>>;
                                    toolUseId: ZodString;
                                    type: ZodLiteral<"tool_result">;
                                },
                                $strip,
                            >,
                        ],
                    >,
                    ZodArray<
                        ZodDiscriminatedUnion<
                            [
                                ZodObject<
                                    {
                                        _meta: ZodOptional<ZodRecord<(...), (...)>>;
                                        annotations: ZodOptional<ZodObject<(...), (...)>>;
                                        text: ZodString;
                                        type: ZodLiteral<"text">;
                                    },
                                    $strip,
                                >,
                                ZodObject<
                                    {
                                        _meta: ZodOptional<ZodRecord<(...), (...)>>;
                                        annotations: ZodOptional<ZodObject<(...), (...)>>;
                                        data: ZodString;
                                        mimeType: ZodString;
                                        type: ZodLiteral<"image">;
                                    },
                                    $strip,
                                >,
                                ZodObject<
                                    {
                                        _meta: ZodOptional<ZodRecord<(...), (...)>>;
                                        annotations: ZodOptional<ZodObject<(...), (...)>>;
                                        data: ZodString;
                                        mimeType: ZodString;
                                        type: ZodLiteral<"audio">;
                                    },
                                    $strip,
                                >,
                                ZodObject<
                                    {
                                        _meta: ZodOptional<ZodRecord<(...), (...)>>;
                                        id: ZodString;
                                        input: ZodRecord<ZodString, ZodUnknown>;
                                        name: ZodString;
                                        type: ZodLiteral<"tool_use">;
                                    },
                                    $strip,
                                >,
                                ZodObject<
                                    {
                                        _meta: ZodOptional<ZodRecord<(...), (...)>>;
                                        content: ZodDefault<ZodArray<(...)>>;
                                        isError: ZodOptional<ZodBoolean>;
                                        structuredContent: ZodOptional<ZodObject<(...), (...)>>;
                                        toolUseId: ZodString;
                                        type: ZodLiteral<"tool_result">;
                                    },
                                    $strip,
                                >,
                            ],
                        >,
                    >,
                ],
            >;
            role: ZodEnum<{ assistant: "assistant"; user: "user" }>;
        },
        $strip,
    > = ...

    Describes a message issued to or received from an LLM API.