feat: add MCI request DTO scaffold conversion

dat-gateway/src/main/java/io/shinhanlife/dat/mcg/presentation/ScaffoldingController.java

@@ -385,6 +385,73 @@ public class ScaffoldingController {
         }
     }
 
+    @PostMapping("/mci-request/analyze")
+    public ResponseEntity<?> analyzeMciRequest(@RequestBody MciResponseAnalyzeRequest request) {
+        if (request == null || request.source() == null || request.source().isBlank()) {
+            return ResponseEntity.badRequest().body(Map.of("error", "XXXX_I.java 소스를 입력해주세요."));
+        }
+        try {
+            MciResponseScaffolder.ParsedSource parsed = MciResponseScaffolder.parse(request.source());
+            String fieldsJson = objectMapper.writeValueAsString(parsed.types().stream()
+                    .flatMap(type -> type.fields().stream().map(field -> Map.of(
+                            "ownerType", type.name(),
+                            "sourceName", field.name(),
+                            "description", field.description(),
+                            "javaType", field.type(),
+                            "sensitive", field.sensitive())))
+                    .toList());
+            String prompt = """
+                    You rename legacy Korean financial-system request fields for an MCP Tool request DTO.
+                    Return JSON only with this exact shape:
+                    {"mappings":[{"ownerType":"SourceOwnerClass","sourceName":"legacyField","targetName":"businessMeaningInEnglish","include":true}]}
+
+                    Rules:
+                    - Return exactly one mapping for every input field, preserving ownerType and sourceName verbatim.
+                    - targetName must be a concise, descriptive English Java camelCase identifier.
+                    - Derive the business meaning primarily from description; use sourceName only as supporting metadata.
+                    - Expand abbreviations: No -> Number, Cd -> Code, Nm -> Name, Ymd/Dt -> Date when the description supports it.
+                    - Do not invent fields, examples, descriptions, values, or business rules.
+                    - Keep include=true. Sensitive fields must still be named accurately; the UI will show a warning for human review.
+                    - targetName values must be unique within each ownerType.
+
+                    Source fields:
+                    %s
+                    """.formatted(fieldsJson);
+            String aiResponse = generateAiContent(prompt, request.model());
+            AiMciMappingDraft draft = objectMapper.readValue(stripCodeFence(aiResponse), AiMciMappingDraft.class);
+            List<MciResponseScaffolder.FieldMapping> mappings = normalizeAiMappings(parsed, draft);
+            return ResponseEntity.ok(new MciResponseAnalyzeResponse(parsed, mappings));
+        } catch (IllegalArgumentException e) {
+            return ResponseEntity.badRequest().body(Map.of("error", safeMessage(e)));
+        } catch (Exception e) {
+            return ResponseEntity.internalServerError()
+                    .body(Map.of("error", "MCI Request AI 분석 실패: " + safeMessage(e)));
+        }
+    }
+
+    @PostMapping("/mci-request/generate")
+    public ResponseEntity<?> generateMciRequest(@RequestBody MciRequestGenerateRequest request) {
+        if (request == null || request.source() == null || request.source().isBlank()) {
+            return ResponseEntity.badRequest().body(Map.of("error", "XXXX_I.java 소스를 입력해주세요."));
+        }
+        try {
+            MciResponseScaffolder.ParsedSource parsed = MciResponseScaffolder.parse(request.source());
+            MciResponseScaffolder.GeneratedRequestSources generated = MciResponseScaffolder.generateRequest(
+                    parsed,
+                    request.requestPackage(),
+                    request.requestClassName(),
+                    request.converterPackage(),
+                    request.converterClassName(),
+                    request.mappings());
+            return ResponseEntity.ok(generated);
+        } catch (IllegalArgumentException e) {
+            return ResponseEntity.badRequest().body(Map.of("error", safeMessage(e)));
+        } catch (Exception e) {
+            return ResponseEntity.internalServerError()
+                    .body(Map.of("error", "MCI Request 소스 생성 실패: " + safeMessage(e)));
+        }
+    }
+
     @PostMapping("/tool/update")
     public String updateTool(@RequestBody Map<String, String> req) {
         try {
@@ -667,6 +734,14 @@ public class ScaffoldingController {
                                              List<MciResponseScaffolder.FieldMapping> mappings) {
     }
 
+    public record MciRequestGenerateRequest(String source,
+                                            String requestPackage,
+                                            String requestClassName,
+                                            String converterPackage,
+                                            String converterClassName,
+                                            List<MciResponseScaffolder.FieldMapping> mappings) {
+    }
+
     private record AiMciMappingDraft(List<AiMciFieldMapping> mappings) {
     }
 

dat-gateway/src/main/resources/static/admin/scaffold.html

@@ -1139,16 +1139,23 @@
                     <div class="mb-4 p-3 rounded" style="background:#18181b; border:1px solid #3f3f46;">
                         <div class="d-flex justify-content-between align-items-start gap-3 flex-wrap">
                             <div>
-                                <h2 style="font-size:1.05rem; color:#f4f4f5; margin:0 0 0.45rem;">Glow MCI 응답을 LLM Response로 변환</h2>
-                                <div class="input-hint mt-0">XXXX_O.java의 전문 구조와 <code>@GlowTrgmField.description</code>은 원문 그대로 읽고, AI는 축약 필드명을 업무 의미가 드러나는 영문 camelCase로만 제안합니다.</div>
+                                <h2 id="mciTransformHeading" style="font-size:1.05rem; color:#f4f4f5; margin:0 0 0.45rem;">Glow MCI 응답을 LLM Response로 변환</h2>
+                                <div id="mciTransformHint" class="input-hint mt-0">XXXX_O.java의 전문 구조와 <code>@GlowTrgmField.description</code>은 원문 그대로 읽고, AI는 축약 필드명을 업무 의미가 드러나는 영문 camelCase로만 제안합니다.</div>
                             </div>
                             <span class="badge-mono">구조: Parser · 이름: AI · 출력: MapStruct</span>
                         </div>
                     </div>
 
                     <div class="row g-3 mb-4">
-                        <div class="col-md-8">
-                            <label class="form-label" for="mciResponseFile">XXXX_O.java 파일</label>
+                        <div class="col-md-3">
+                            <label class="form-label" for="mciTransformMode">변환 대상</label>
+                            <select id="mciTransformMode" class="form-select">
+                                <option value="RESPONSE" selected>Response (_O.java)</option>
+                                <option value="REQUEST">Request (_I.java)</option>
+                            </select>
+                        </div>
+                        <div class="col-md-5">
+                            <label id="mciSourceFileLabel" class="form-label" for="mciResponseFile">XXXX_O.java 파일</label>
                             <input class="form-control" type="file" id="mciResponseFile" accept=".java,text/x-java-source">
                             <div class="input-hint">파일을 선택하면 아래 소스 입력란에 UTF-8 텍스트로 불러옵니다. 소스를 직접 붙여넣어도 됩니다.</div>
                         </div>
@@ -1171,7 +1178,7 @@
                     </div>
 
                     <div class="mb-4">
-                        <label class="form-label" for="mciResponseSource">MCI 응답 소스</label>
+                        <label id="mciSourceInputLabel" class="form-label" for="mciResponseSource">MCI 응답 소스</label>
                         <textarea id="mciResponseSource" class="form-control" rows="13" spellcheck="false" placeholder="package ...;&#10;&#10;public class ONBSZ0460_O {&#10;    @GlowTrgmField(order = 1, length = 8, description = &quot;인사번호&quot;)&#10;    private String prafNo;&#10;}"></textarea>
                     </div>
 
@@ -1182,11 +1189,11 @@
                     <div id="mciResponseResultArea" style="display:none;">
                         <div class="row g-3 mb-4">
                             <div class="col-md-6">
-                                <label class="form-label" for="mciResponsePackage">Response Package</label>
+                                <label id="mciDtoPackageLabel" class="form-label" for="mciResponsePackage">Response Package</label>
                                 <input id="mciResponsePackage" type="text" class="form-control" value="io.shinhanlife.dat.mcc.biz.pro.dto">
                             </div>
                             <div class="col-md-6">
-                                <label class="form-label" for="mciResponseClassName">Response Class</label>
+                                <label id="mciDtoClassLabel" class="form-label" for="mciResponseClassName">Response Class</label>
                                 <input id="mciResponseClassName" type="text" class="form-control" placeholder="IndividualCustomerDetailInquiryResponse">
                                 <div class="input-hint">업무 의미가 드러나는 PascalCase 이름으로 최종 확인하세요.</div>
                             </div>
@@ -1234,7 +1241,7 @@
                             <div class="row g-3">
                                 <div class="col-lg-6">
                                     <div class="d-flex justify-content-between align-items-center mb-2">
-                                        <label class="form-label mb-0">Response.java</label>
+                                        <label id="mciDtoPreviewLabel" class="form-label mb-0">Response.java</label>
                                         <div class="d-flex gap-2">
                                             <button type="button" class="btn-secondary-action" onclick="copyMciResponseSource('mciResponsePreview')">복사</button>
                                             <button type="button" class="btn-secondary-action" onclick="downloadMciResponseSource('response')">다운로드</button>
@@ -2616,9 +2623,18 @@ const mciResponseState = {
     parsed: null,
     responseSource: '',
     converterSource: '',
-    autoConverterName: ''
+    autoConverterName: '',
+    mode: 'RESPONSE'
 };
 
+document.getElementById('mciTransformMode').addEventListener('change', function() {
+    mciResponseState.mode = this.value;
+    document.getElementById('mciResponseResultArea').style.display = 'none';
+    document.getElementById('mciResponsePreviewArea').style.display = 'none';
+    mciResponseState.parsed = null;
+    updateMciTransformMode();
+});
+
 document.getElementById('mciResponseFile').addEventListener('change', async function() {
     const file = this.files && this.files[0];
     if (!file) return;
@@ -2645,15 +2661,16 @@ document.getElementById('mciResponsePackage').addEventListener('input', function
 
 async function analyzeMciResponse() {
     const source = document.getElementById('mciResponseSource').value.trim();
+    const labels = mciTransformLabels();
     if (!source) {
-        setMciResponseStatus('XXXX_O.java 파일을 선택하거나 소스를 붙여넣어 주세요.', true);
+        setMciResponseStatus(`XXXX_${labels.suffix}.java 파일을 선택하거나 소스를 붙여넣어 주세요.`, true);
         return;
     }
     const button = document.getElementById('mciResponseAnalyzeButton');
     setMciResponseButtonBusy(button, true, 'AI 분석 중...');
-    setMciResponseStatus('Glow 전문 구조를 분석하고 AI가 LLM 필드명을 제안하고 있습니다.', false);
+    setMciResponseStatus(`Glow ${labels.korean} 전문 구조를 분석하고 AI가 LLM 필드명을 제안하고 있습니다.`, false);
     try {
-        const response = await fetch('/api/v1/scaffold/mci-response/analyze', {
+        const response = await fetch(`/api/v1/scaffold/mci-${labels.endpoint}/analyze`, {
             method: 'POST',
             headers: {'Content-Type': 'application/json'},
             body: JSON.stringify({
@@ -2670,7 +2687,7 @@ async function analyzeMciResponse() {
         renderMciResponseMappings(result.parsed, result.mappings || []);
         document.getElementById('mciResponseResultArea').style.display = 'block';
         document.getElementById('mciResponsePreviewArea').style.display = 'none';
-        setMciResponseStatus('AI 제안을 불러왔습니다. 필드명과 개인정보 표시를 검토한 뒤 미리보기를 생성하세요.', false);
+        setMciResponseStatus(`AI 제안을 불러왔습니다. 필드명과 개인정보 표시를 검토한 뒤 ${labels.dto} 미리보기를 생성하세요.`, false);
     } catch (error) {
         setMciResponseStatus(error.message, true);
     } finally {
@@ -2680,10 +2697,11 @@ async function analyzeMciResponse() {
 
 function initializeMciResponseNames(parsed) {
     const rootName = parsed?.rootClassName || 'MciOutput';
-    const baseName = rootName.replace(/_O$/, '') || 'MciOutput';
-    const responseName = `${baseName}Response`;
-    const converterName = `${baseName}Converter`;
-    document.getElementById('mciResponseClassName').value = responseName;
+    const labels = mciTransformLabels();
+    const baseName = rootName.replace(/_[OI]$/, '') || 'MciOutput';
+    const dtoName = `${baseName}${labels.dto}`;
+    const converterName = `${baseName}${labels.dto}Converter`;
+    document.getElementById('mciResponseClassName').value = dtoName;
     document.getElementById('mciConverterClassName').value = converterName;
     mciResponseState.autoConverterName = converterName;
 
@@ -2763,7 +2781,7 @@ function createMciResponseMappingRow(type, field, mapping) {
         badge.style.borderColor = '#7f1d1d';
         badge.style.background = 'rgba(127,29,29,0.22)';
         badge.textContent = 'PII';
-        badge.title = '개인정보 가능성이 있는 필드입니다. Tool 응답 노출 여부를 반드시 확인하세요.';
+        badge.title = '개인정보 가능성이 있는 필드입니다. Tool 입출력 노출 여부를 반드시 확인하세요.';
         warningCell.appendChild(badge);
     } else {
         warningCell.textContent = '-';
@@ -2811,37 +2829,61 @@ async function generateMciResponseSources() {
         setMciResponseStatus('먼저 AI 필드명 분석을 실행하세요.', true);
         return;
     }
+    const labels = mciTransformLabels();
     const button = document.getElementById('mciResponseGenerateButton');
-    setMciResponseButtonBusy(button, true, '소스 생성 중...');
+    setMciResponseButtonBusy(button, true, `${labels.dto} 소스 생성 중...`);
     try {
         const payload = {
             source: document.getElementById('mciResponseSource').value,
-            responsePackage: document.getElementById('mciResponsePackage').value.trim(),
-            responseClassName: document.getElementById('mciResponseClassName').value.trim(),
             converterPackage: document.getElementById('mciConverterPackage').value.trim(),
             converterClassName: document.getElementById('mciConverterClassName').value.trim(),
             mappings: collectMciResponseMappings()
         };
-        const response = await fetch('/api/v1/scaffold/mci-response/generate', {
+        payload[labels.dto.toLowerCase() + 'Package'] = document.getElementById('mciResponsePackage').value.trim();
+        payload[labels.dto.toLowerCase() + 'ClassName'] = document.getElementById('mciResponseClassName').value.trim();
+        const response = await fetch(`/api/v1/scaffold/mci-${labels.endpoint}/generate`, {
             method: 'POST',
             headers: {'Content-Type': 'application/json'},
             body: JSON.stringify(payload)
         });
         const result = await response.json();
         if (!response.ok) throw new Error(result.error || `소스 생성 실패 (HTTP ${response.status})`);
-        mciResponseState.responseSource = result.responseSource || '';
+        mciResponseState.responseSource = result[labels.dto.toLowerCase() + 'Source'] || '';
         mciResponseState.converterSource = result.converterSource || '';
         document.getElementById('mciResponsePreview').value = mciResponseState.responseSource;
         document.getElementById('mciConverterPreview').value = mciResponseState.converterSource;
         document.getElementById('mciResponsePreviewArea').style.display = 'block';
-        setMciResponseStatus('Response와 MapStruct Converter를 생성했습니다. 미리보기 검토 후 다운로드하세요.', false);
+        setMciResponseStatus(`${labels.dto}와 MapStruct Converter를 생성했습니다. 미리보기 검토 후 다운로드하세요.`, false);
     } catch (error) {
         setMciResponseStatus(error.message, true);
     } finally {
-        setMciResponseButtonBusy(button, false, 'Response / Converter 미리보기 생성');
+        setMciResponseButtonBusy(button, false, `${labels.dto} / Converter 미리보기 생성`);
     }
 }
 
+function updateMciTransformMode() {
+    const labels = mciTransformLabels();
+    document.getElementById('mciTransformHeading').textContent = `Glow MCI ${labels.korean}을 LLM ${labels.dto}로 변환`;
+    document.getElementById('mciTransformHint').innerHTML = `XXXX_${labels.suffix}.java의 전문 구조와 <code>@GlowTrgmField.description</code>은 원문 그대로 읽고, AI는 축약 필드명을 업무 의미가 드러나는 영문 camelCase로만 제안합니다.`;
+    document.getElementById('mciSourceFileLabel').textContent = `XXXX_${labels.suffix}.java 파일`;
+    document.getElementById('mciSourceInputLabel').textContent = `MCI ${labels.korean} 소스`;
+    document.getElementById('mciDtoPackageLabel').textContent = `${labels.dto} Package`;
+    document.getElementById('mciDtoClassLabel').textContent = `${labels.dto} Class`;
+    document.getElementById('mciDtoPreviewLabel').textContent = `${labels.dto}.java`;
+    document.getElementById('mciResponseClassName').placeholder = `IndividualCustomerDetailInquiry${labels.dto}`;
+    document.getElementById('mciConverterClassName').placeholder = `IndividualCustomerDetailInquiry${labels.dto}Converter`;
+    document.getElementById('mciResponseAnalyzeButton').textContent = 'AI로 필드명 분석';
+    document.getElementById('mciResponseGenerateButton').textContent = `${labels.dto} / Converter 미리보기 생성`;
+    document.getElementById('mciResponseSource').placeholder = `package ...;\n\npublic class ONBSZ0460_${labels.suffix} {\n    @GlowTrgmField(order = 1, length = 8, description = \"인사번호\")\n    private String prafNo;\n}`;
+}
+
+function mciTransformLabels() {
+    const isRequest = document.getElementById('mciTransformMode').value === 'REQUEST';
+    return isRequest
+        ? {dto: 'Request', korean: '요청', suffix: 'I', endpoint: 'request'}
+        : {dto: 'Response', korean: '응답', suffix: 'O', endpoint: 'response'};
+}
+
 async function copyMciResponseSource(elementId) {
     const textarea = document.getElementById(elementId);
     if (!textarea.value) return;

dat-gateway/src/test/java/io/shinhanlife/dat/mcg/presentation/ScaffoldingControllerToolDraftTest.java

@@ -194,6 +194,76 @@ class ScaffoldingControllerToolDraftTest {
                         "@Mapping(source = \"prafNo\", target = \"employeeNumber\")")));
     }
 
+    @Test
+    void mciRequestGenerateReturnsRequestAndReverseConverterPreviews() throws Exception {
+        MockMvc mockMvc = MockMvcBuilders.standaloneSetup(
+                        new ScaffoldingController(mock(ChatClient.Builder.class), new ObjectMapper()))
+                .setMessageConverters(new MappingJackson2HttpMessageConverter())
+                .build();
+        String source = """
+                package io.shinhanlife.dat.mcc.infra.itrf.mci.onbsz.io;
+                public class ONBSZ0460_I {
+                    @GlowTrgmField(order = 1, length = 8, description = "인사번호")
+                    private String prafNo;
+                }
+                """;
+        String request = new ObjectMapper().writeValueAsString(java.util.Map.of(
+                "source", source,
+                "requestPackage", "io.shinhanlife.dat.mcc.biz.pro.dto",
+                "requestClassName", "IndividualCustomerDetailInquiryRequest",
+                "converterPackage", "io.shinhanlife.dat.mcc.biz.pro.converter",
+                "converterClassName", "IndividualCustomerDetailInquiryRequestConverter",
+                "mappings", java.util.List.of(java.util.Map.of(
+                        "ownerType", "ONBSZ0460_I",
+                        "sourceName", "prafNo",
+                        "targetName", "employeeNumber",
+                        "include", true))));
+
+        mockMvc.perform(post("/api/v1/scaffold/mci-request/generate")
+                        .contentType(MediaType.APPLICATION_JSON).content(request))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.requestSource", org.hamcrest.Matchers.containsString(
+                        "private String employeeNumber;")))
+                .andExpect(jsonPath("$.converterSource", org.hamcrest.Matchers.containsString(
+                        "@Mapping(source = \"employeeNumber\", target = \"prafNo\")")));
+    }
+
+    @Test
+    void mciRequestAnalyzeReturnsAiSuggestedRequestFieldNames() throws Exception {
+        ChatClient.Builder builder = mock(ChatClient.Builder.class);
+        ChatClient chatClient = mock(ChatClient.class);
+        ChatClient.ChatClientRequestSpec requestSpec = mock(ChatClient.ChatClientRequestSpec.class);
+        ChatClient.CallResponseSpec responseSpec = mock(ChatClient.CallResponseSpec.class);
+        when(builder.build()).thenReturn(chatClient);
+        when(chatClient.prompt()).thenReturn(requestSpec);
+        when(requestSpec.user(anyString())).thenReturn(requestSpec);
+        when(requestSpec.options(any(ChatOptions.class))).thenReturn(requestSpec);
+        when(requestSpec.call()).thenReturn(responseSpec);
+        when(responseSpec.content()).thenReturn("""
+                {"mappings":[{"ownerType":"ONBSZ0460_I","sourceName":"prafNo","targetName":"employeeNumber","include":true}]}
+                """);
+        MockMvc mockMvc = MockMvcBuilders.standaloneSetup(
+                        new ScaffoldingController(builder, new ObjectMapper()))
+                .setMessageConverters(new MappingJackson2HttpMessageConverter())
+                .build();
+        String source = """
+                package io.shinhanlife.dat.mcc.infra.itrf.mci.onbsz.io;
+                public class ONBSZ0460_I {
+                    @GlowTrgmField(order = 1, length = 8, description = "인사번호")
+                    private String prafNo;
+                }
+                """;
+
+        mockMvc.perform(post("/api/v1/scaffold/mci-request/analyze")
+                        .contentType(MediaType.APPLICATION_JSON)
+                        .content(new ObjectMapper().writeValueAsString(java.util.Map.of(
+                                "source", source,
+                                "model", "cohere/north-mini-code:free"))))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.parsed.rootClassName").value("ONBSZ0460_I"))
+                .andExpect(jsonPath("$.mappings[0].targetName").value("employeeNumber"));
+    }
+
     @Test
     void podDraftUsesTheCurrentTargetModuleOptionsForConfusableServers() {
         ChatClient.Builder builder = mock(ChatClient.Builder.class);

dat-was-lib/src/main/java/io/shinhanlife/dat/lib/util/MciResponseScaffolder.java

@@ -13,7 +13,7 @@ import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
 /**
- * Glow MCI 응답 전문({@code *_O.java})을 분석하여 LLM 노출용 Response DTO와
+ * Glow MCI 전문({@code *_I.java}/{@code *_O.java})을 분석하여 LLM 노출용 Request/Response DTO와
  * MapStruct Converter 소스를 생성합니다. AI는 필드명 제안에만 사용하고 전문 구조와
  * {@code GlowTrgmField.description}은 이 클래스가 원문에서 직접 추출합니다.
  */
@@ -60,6 +60,9 @@ public final class MciResponseScaffolder {
     public record GeneratedSources(String responseSource, String converterSource) {
     }
 
+    public record GeneratedRequestSources(String requestSource, String converterSource) {
+    }
+
     public static ParsedSource parse(String source) {
         if (source == null || source.isBlank()) {
             throw new IllegalArgumentException("MCI 응답 Java 소스를 입력해주세요.");
@@ -113,6 +116,28 @@ public final class MciResponseScaffolder {
                         converterClassName, mappingBySource));
     }
 
+    /**
+     * LLM Request DTO에서 Glow MCI 입력 전문으로 변환하는 MapStruct Converter를 생성합니다.
+     */
+    public static GeneratedRequestSources generateRequest(ParsedSource parsed, String requestPackage,
+                                                          String requestClassName, String converterPackage,
+                                                          String converterClassName, List<FieldMapping> mappings) {
+        if (parsed == null || parsed.types() == null || parsed.types().isEmpty()) {
+            throw new IllegalArgumentException("분석된 MCI 요청 정보가 없습니다.");
+        }
+        validatePackage(requestPackage, "Request package");
+        validatePackage(converterPackage, "Converter package");
+        validateClassName(requestClassName, "Request class");
+        validateClassName(converterClassName, "Converter class");
+
+        Map<String, FieldMapping> mappingBySource = normalizeMappings(parsed, mappings);
+        validateTargetNames(parsed, mappingBySource);
+        return new GeneratedRequestSources(
+                responseSource(parsed, requestPackage, requestClassName, mappingBySource),
+                requestConverterSource(parsed, requestPackage, requestClassName, converterPackage,
+                        converterClassName, mappingBySource));
+    }
+
     private static List<ClassRange> findClassRanges(String source) {
         List<ClassRangeDraft> drafts = new ArrayList<>();
         Matcher matcher = CLASS_PATTERN.matcher(source);
@@ -356,6 +381,30 @@ public final class MciResponseScaffolder {
         return source.append("}\n").toString();
     }
 
+    private static String requestConverterSource(ParsedSource parsed, String requestPackage, String requestClassName,
+                                                 String converterPackage, String converterClassName,
+                                                 Map<String, FieldMapping> mappings) {
+        StringBuilder source = new StringBuilder("package ").append(converterPackage).append(";\n\n")
+                .append("import ").append(requestPackage).append('.').append(requestClassName).append(";\n")
+                .append("import ").append(parsed.packageName()).append('.').append(parsed.rootClassName()).append(";\n")
+                .append("import org.mapstruct.Mapper;\n")
+                .append("import org.mapstruct.Mapping;\n")
+                .append("import org.mapstruct.ReportingPolicy;\n\n")
+                .append("@Mapper(componentModel = \"spring\", unmappedTargetPolicy = ReportingPolicy.IGNORE)\n")
+                .append("public interface ").append(converterClassName).append(" {\n\n");
+
+        appendRequestMappingMethod(source, parsed.types().getFirst(), parsed.rootClassName(),
+                requestClassName, "toLegacyRequest", mappings);
+        Map<String, ParsedType> typeByName = new HashMap<>();
+        parsed.types().forEach(type -> typeByName.put(type.name(), type));
+        for (ParsedType type : parsed.types().stream().skip(1).toList()) {
+            appendRequestMappingMethod(source, type,
+                    sourceTypePath(parsed.rootClassName(), type, typeByName),
+                    requestClassName + "." + type.name(), "toLegacy" + type.name(), mappings);
+        }
+        return source.append("}\n").toString();
+    }
+
     private static void appendMappingMethod(StringBuilder source, ParsedType type, String targetType,
                                             String sourceType, String methodName,
                                             Map<String, FieldMapping> mappings) {
@@ -370,6 +419,20 @@ public final class MciResponseScaffolder {
                 .append('(').append(sourceType).append(" source);\n\n");
     }
 
+    private static void appendRequestMappingMethod(StringBuilder source, ParsedType type, String legacyTargetType,
+                                                   String requestSourceType, String methodName,
+                                                   Map<String, FieldMapping> mappings) {
+        for (ParsedField field : type.fields()) {
+            FieldMapping mapping = mappings.get(key(type.name(), field.name()));
+            if (mapping.include() && !field.name().equals(mapping.targetName())) {
+                source.append("    @Mapping(source = \"").append(mapping.targetName())
+                        .append("\", target = \"").append(field.name()).append("\")\n");
+            }
+        }
+        source.append("    ").append(legacyTargetType).append(' ').append(methodName)
+                .append('(').append(requestSourceType).append(" source);\n\n");
+    }
+
     private static String sourceTypePath(String rootClassName, ParsedType type,
                                          Map<String, ParsedType> typeByName) {
         List<String> names = new ArrayList<>();

dat-was-lib/src/test/java/io/shinhanlife/dat/lib/util/MciResponseScaffolderTest.java

@@ -80,6 +80,35 @@ class MciResponseScaffolderTest {
                 "IndividualCustomerDetailInquiryResponse.CmnnPrafIfinOutDto toCmnnPrafIfinOutDto(ONBSZ0460_O.CmnnPrafIfinOutDto source);"));
     }
 
+    @Test
+    void generatesLlmRequestAndMapsLlmFieldsBackToLegacyInput() {
+        String requestSource = MCI_SOURCE.replace("ONBSZ0460_O", "ONBSZ0460_I");
+        MciResponseScaffolder.ParsedSource parsed = MciResponseScaffolder.parse(requestSource);
+        List<MciResponseScaffolder.FieldMapping> mappings = List.of(
+                new MciResponseScaffolder.FieldMapping("ONBSZ0460_I", "employeeItems", "employees", true),
+                new MciResponseScaffolder.FieldMapping("CmnnPrafIfinOutDto", "prafNo", "employeeNumber", true),
+                new MciResponseScaffolder.FieldMapping("CmnnPrafIfinOutDto", "prafTypeCd", "employeeTypeCode", true),
+                new MciResponseScaffolder.FieldMapping("CmnnPrafIfinOutDto", "prafNm", "employeeName", true),
+                new MciResponseScaffolder.FieldMapping("CmnnPrafIfinOutDto", "rdreNo", "residentRegistrationNumber", true));
+
+        MciResponseScaffolder.GeneratedRequestSources generated = MciResponseScaffolder.generateRequest(
+                parsed,
+                "io.shinhanlife.dat.mcc.biz.pro.dto",
+                "IndividualCustomerDetailInquiryRequest",
+                "io.shinhanlife.dat.mcc.biz.pro.converter",
+                "IndividualCustomerDetailInquiryRequestConverter",
+                mappings);
+
+        assertTrue(generated.requestSource().contains("@Schema(description = \"인사번호\")"));
+        assertTrue(generated.requestSource().contains("private String employeeNumber;"));
+        assertTrue(generated.converterSource().contains(
+                "@Mapping(source = \"employeeNumber\", target = \"prafNo\")"));
+        assertTrue(generated.converterSource().contains(
+                "ONBSZ0460_I toLegacyRequest(IndividualCustomerDetailInquiryRequest source);"));
+        assertTrue(generated.converterSource().contains(
+                "ONBSZ0460_I.CmnnPrafIfinOutDto toLegacyCmnnPrafIfinOutDto("));
+    }
+
     @Test
     void rejectsDuplicateAiTargetNamesWithinTheSameType() {
         MciResponseScaffolder.ParsedSource parsed = MciResponseScaffolder.parse(MCI_SOURCE);