Feat: Large Payload 분할 전송 기능 이식 및 통합 테스트 완료

axhub-gateway/build.gradle

@@ -24,6 +24,12 @@ dependencies {
 
     // implementation 'com.networknt:json-schema-validator:1.4.0' // Spring AI 내장 버전과 충돌 방지를 위해 주석 처리
     implementation 'org.springdoc:springdoc-openapi-starter-webmvc-ui:2.5.0'
+
+    testImplementation 'org.springframework.boot:spring-boot-starter-test'
+}
+
+tasks.named('test') {
+    useJUnitPlatform()
 }
 
 dependencies {

axhub-gateway/src/main/java/io/shinhanlife/axhub/biz/mcp/gateway/config/AgentResponseBudgetProperties.java

@@ -0,0 +1,26 @@
+package io.shinhanlife.axhub.biz.mcp.gateway.config;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.stereotype.Component;
+
+@Component
+@ConfigurationProperties(prefix = "mcp.agent-response")
+public class AgentResponseBudgetProperties {
+    private Integer maxPreviewItems;
+    private Integer maxFieldsPerItem;
+    private Long maxItemBytes;
+    private Long maxTotalBytes;
+    private Boolean includeSummary;
+
+    public void setMaxPreviewItems(Integer maxPreviewItems) { this.maxPreviewItems = maxPreviewItems; }
+    public void setMaxFieldsPerItem(Integer maxFieldsPerItem) { this.maxFieldsPerItem = maxFieldsPerItem; }
+    public void setMaxItemBytes(Long maxItemBytes) { this.maxItemBytes = maxItemBytes; }
+    public void setMaxTotalBytes(Long maxTotalBytes) { this.maxTotalBytes = maxTotalBytes; }
+    public void setIncludeSummary(Boolean includeSummary) { this.includeSummary = includeSummary; }
+
+    public int maxPreviewItems() { return maxPreviewItems == null || maxPreviewItems < 1 ? 20 : maxPreviewItems; }
+    public int maxFieldsPerItem() { return maxFieldsPerItem == null || maxFieldsPerItem < 1 ? 10 : maxFieldsPerItem; }
+    public long maxItemBytes() { return maxItemBytes == null || maxItemBytes < 1 ? 4_096 : maxItemBytes; }
+    public long maxTotalBytes() { return maxTotalBytes == null || maxTotalBytes < 1 ? 65_536 : maxTotalBytes; }
+    public boolean includeSummary() { return includeSummary == null || includeSummary; }
+}

axhub-gateway/src/main/java/io/shinhanlife/axhub/biz/mcp/gateway/dto/ToolMetadata.java

@@ -9,7 +9,7 @@ import lombok.Data;
 import lombok.NoArgsConstructor;
 
 import java.util.Map;
-1import java.util.Set;
+import java.util.Set;
 import java.util.List;
 import java.util.HashSet;
 /**

axhub-gateway/src/main/java/io/shinhanlife/axhub/biz/mcp/gateway/service/ExecuteService.java

@@ -24,8 +24,11 @@ import lombok.extern.slf4j.Slf4j;
 import org.springframework.http.MediaType;
 import org.springframework.stereotype.Service;
 import org.springframework.web.client.RestClient;
+import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.databind.node.ObjectNode;
+import io.shinhanlife.axhub.biz.mcp.gateway.tool.large.LargeToolResponseService;
+import io.shinhanlife.axhub.biz.mcp.gateway.tool.large.PaginationRequestValidator;
 
 @Slf4j
 @Service
@@ -42,6 +45,8 @@ public class ExecuteService {
     private final ToolAuthorizationService authorizationService;
     private final RedisToolTraceService redisTrace;
     private final McpGatewayProperties properties;
+    private final LargeToolResponseService largeResponses;
+    private final PaginationRequestValidator paginationValidator;
     private final RestClient restClient = RestClient.create();
     private final ExecutorService executor;
 
@@ -55,7 +60,9 @@ public class ExecuteService {
                           CircuitBreakerService circuitBreakerService,
                           ToolAuthorizationService authorizationService,
                           RedisToolTraceService redisTrace,
-                          McpGatewayProperties properties) {
+                          McpGatewayProperties properties,
+                          LargeToolResponseService largeResponses,
+                          PaginationRequestValidator paginationValidator) {
         this.planner = planner;
         this.killSwitchService = killSwitchService;
         this.objectMapper = objectMapper;
@@ -67,6 +74,8 @@ public class ExecuteService {
         this.authorizationService = authorizationService;
         this.redisTrace = redisTrace;
         this.properties = properties;
+        this.largeResponses = largeResponses;
+        this.paginationValidator = paginationValidator;
         
         this.executor = new ThreadPoolExecutor(
                 properties.toolExecutorCorePoolSize(),
@@ -145,7 +154,7 @@ public class ExecuteService {
             try {
                 redisTrace.attemptStarted(context, metadata, arguments, attempt, retryPolicy.maxAttempts());
                 circuitBreaker.beforeCall();
-                Object result = executeOnce(metadata, payload);
+                Object result = executeOnce(context, metadata, arguments, payload);
                 circuitBreaker.recordSuccess();
                 return result;
             } catch (ToolExecutionException error) {
@@ -165,7 +174,7 @@ public class ExecuteService {
                 : lastError;
     }
 
-    private Object executeOnce(ToolMetadata metadata, Map<String, Object> payload) {
+    private Object executeOnce(McpRequestContext context, ToolMetadata metadata, ObjectNode arguments, Map<String, Object> payload) {
         CompletableFuture<Object> future;
 
         try {
@@ -177,24 +186,49 @@ public class ExecuteService {
                     }
                     String executeApiUrl = targetUrl + "/mcp/api/v1/tools/call";
                     
-                    try {
+                    ObjectNode pageArguments = paginationValidator.normalize(arguments);
-                        log.info(" [ExecuteService] 요청 페이로드(마스킹 적용): {}", objectMapper.writeValueAsString(dataMasker.mask(objectMapper.valueToTree(payload))));
+                    LargeToolResponseService.Collector collector = largeResponses.newCollector(metadata.getName(), context.requestId());
-                    } catch (Exception ignore) {}
+
+                    while (true) {
+                        Map<String, Object> pagePayload = new java.util.HashMap<>(payload);
+                        if (pagePayload.containsKey("params")) {
+                            Map<String, Object> params = new java.util.HashMap<>((Map<String, Object>) pagePayload.get("params"));
+                            params.put("arguments", objectMapper.convertValue(pageArguments, Map.class));
+                            pagePayload.put("params", params);
+                        } else {
+                            pagePayload.put("arguments", objectMapper.convertValue(pageArguments, Map.class));
+                        }
                         
                         try {
-                        return executeWithUrl(payload, executeApiUrl);
+                            log.info(" [ExecuteService] 요청 페이로드(마스킹 적용): {}", objectMapper.writeValueAsString(dataMasker.mask(objectMapper.valueToTree(pagePayload))));
+                        } catch (Exception ignore) {}
+                        
+                        JsonNode data = null;
+                        try {
+                            Object httpResult = executeWithUrl(pagePayload, executeApiUrl);
+                            data = extractData(objectMapper.valueToTree(httpResult));
                         } catch (Exception e) {
                             if (executeApiUrl.contains("http://tool-")) {
                                 String fallbackUrl = executeApiUrl.replaceAll("http://tool-[a-zA-Z0-9-]+", "http://localhost");
                                 log.warn(" [ExecuteService] 호스트를 찾을 수 없어 localhost로 재시도합니다: {}", fallbackUrl);
                                 try {
-                                return executeWithUrl(payload, fallbackUrl);
+                                    Object httpResult = executeWithUrl(pagePayload, fallbackUrl);
+                                    data = extractData(objectMapper.valueToTree(httpResult));
                                 } catch (Exception ex) {
                                     throw new ToolExecutionException(FailureType.SERVER_ERROR, "Tool Pod 호출 실패 (localhost 재시도 포함): " + ex.getMessage());
                                 }
-                        }
+                            } else {
                                 throw new ToolExecutionException(FailureType.SERVER_ERROR, "Tool Pod 호출 실패: " + e.getMessage());
                             }
+                        }
+
+                        collector.accept(data);
+                        if (!collector.shouldFetchNextPage()) {
+                            return collector.finish();
+                        }
+                        pageArguments.put("cursor", collector.nextCursor());
+                        pageArguments.put("pageSize", collector.pageSize());
+                    }
                 } catch (ToolExecutionException error) {
                     throw error;
                 } catch (Exception error) {
@@ -240,6 +274,13 @@ public class ExecuteService {
                 .body(Object.class);
     }
     
+    private JsonNode extractData(JsonNode root) {
+        if (!root.path("success").asBoolean(true)) {
+            throw new ToolExecutionException(FailureType.BUSINESS_ERROR, "Tool 서버 업무 오류: " + root.path("error").asText());
+        }
+        return root.has("data") ? root.get("data") : root;
+    }
+    
     private RetryPolicy retryPolicy(ToolMetadata metadata, ObjectNode arguments) {
         if (!retryAllowedByOperation(metadata, arguments)) {
             return RetryPolicy.disabled();

axhub-gateway/src/main/java/io/shinhanlife/axhub/biz/mcp/gateway/tool/large/AgentResponseBudgetService.java

@@ -0,0 +1,229 @@
+package io.shinhanlife.axhub.biz.mcp.gateway.tool.large;
+
+import io.shinhanlife.axhub.biz.mcp.gateway.config.AgentResponseBudgetProperties;
+import io.shinhanlife.axhub.biz.mcp.gateway.guardrail.SensitiveDataMasker;
+import org.springframework.stereotype.Service;
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.node.ArrayNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+
+@Service
+public class AgentResponseBudgetService {
+    private final AgentResponseBudgetProperties properties;
+    private final ObjectMapper json;
+    private final SensitiveDataMasker masker;
+
+    public AgentResponseBudgetService(AgentResponseBudgetProperties properties, ObjectMapper json, SensitiveDataMasker masker) {
+        this.properties = properties;
+        this.json = json;
+        this.masker = masker;
+    }
+
+    public ObjectNode apply(ObjectNode response) {
+        ArrayNode originalItems = response.path("previewItems").isArray()
+                ? (ArrayNode) response.path("previewItems")
+                : json.createArrayNode();
+        int originalCount = originalItems.size();
+        BudgetStats stats = new BudgetStats();
+        ArrayNode budgetItems = json.createArrayNode();
+
+        for (JsonNode item : originalItems) {
+            if (budgetItems.size() >= properties.maxPreviewItems()) {
+                stats.omittedItems++;
+                stats.limited = true;
+                continue;
+            }
+            JsonNode budgetItem = budgetItem(item, stats);
+            if (jsonBytes(budgetItem) > properties.maxItemBytes()) {
+                budgetItem = fallbackTruncatedItem(budgetItem);
+                stats.truncatedItems++;
+                stats.limited = true;
+            }
+            budgetItems.add(budgetItem);
+        }
+
+        ObjectNode budgeted = copyWithout(response, "previewItems", "budget", "summary");
+        budgeted.set("previewItems", budgetItems);
+        if (properties.includeSummary()) {
+            budgeted.put("summary", summary(budgeted, originalCount, budgetItems.size()));
+        }
+
+        while (jsonBytes(budgeted) > properties.maxTotalBytes() && budgetItems.size() > 0) {
+            budgetItems.remove(budgetItems.size() - 1);
+            stats.omittedItems++;
+            stats.limited = true;
+            budgeted.set("previewItems", budgetItems);
+            if (properties.includeSummary()) {
+                budgeted.put("summary", summary(budgeted, originalCount, budgetItems.size()));
+            }
+        }
+
+        ObjectNode budget = json.createObjectNode();
+        updateBudget(budget, stats, originalCount, budgetItems.size());
+        budgeted.put("previewCount", budgetItems.size());
+        budgeted.set("budget", budget);
+        while (jsonBytes(budgeted) > properties.maxTotalBytes() && budgetItems.size() > 0) {
+            budgetItems.remove(budgetItems.size() - 1);
+            stats.omittedItems++;
+            stats.limited = true;
+            budgeted.set("previewItems", budgetItems);
+            budgeted.put("previewCount", budgetItems.size());
+            if (properties.includeSummary()) {
+                budgeted.put("summary", summary(budgeted, originalCount, budgetItems.size()));
+            }
+            updateBudget(budget, stats, originalCount, budgetItems.size());
+            budgeted.set("budget", budget);
+        }
+        return budgeted;
+    }
+
+    private void updateBudget(ObjectNode budget, BudgetStats stats, int originalCount, int previewCount) {
+        budget.put("limited", stats.limited || stats.omittedItems > 0 || stats.truncatedItems > 0);
+        budget.put("maxPreviewItems", properties.maxPreviewItems());
+        budget.put("maxFieldsPerItem", properties.maxFieldsPerItem());
+        budget.put("maxItemBytes", properties.maxItemBytes());
+        budget.put("maxTotalBytes", properties.maxTotalBytes());
+        budget.put("originalPreviewCount", originalCount);
+        budget.put("previewCount", previewCount);
+        budget.put("omittedItems", stats.omittedItems);
+        budget.put("truncatedItems", stats.truncatedItems);
+    }
+
+    private JsonNode budgetItem(JsonNode item, BudgetStats stats) {
+        JsonNode masked = masker.mask(item);
+        if (!masked.isObject()) {
+            return truncateByBytes(masked, stats);
+        }
+        ObjectNode limited = json.createObjectNode();
+        int copied = 0;
+        int originalFields = 0;
+        
+        java.util.Iterator<java.util.Map.Entry<String, JsonNode>> fields = masked.fields();
+        while (fields.hasNext()) {
+            java.util.Map.Entry<String, JsonNode> entry = fields.next();
+            originalFields++;
+            if (copied >= properties.maxFieldsPerItem()) {
+                continue;
+            }
+            limited.set(entry.getKey(), entry.getValue());
+            copied++;
+        }
+        
+        if (originalFields > copied) {
+            limited.put("truncated", true);
+            limited.put("omittedFieldCount", originalFields - copied);
+            stats.truncatedItems++;
+            stats.limited = true;
+        }
+        return truncateByBytes(limited, stats);
+    }
+
+    private JsonNode truncateByBytes(JsonNode item, BudgetStats stats) {
+        if (jsonBytes(item) <= properties.maxItemBytes()) {
+            return item;
+        }
+        if (!item.isObject()) {
+            stats.truncatedItems++;
+            stats.limited = true;
+            ObjectNode truncated = json.createObjectNode();
+            truncated.put("truncated", true);
+            truncated.put("originalBytes", jsonBytes(item));
+            truncated.put("maxItemBytes", properties.maxItemBytes());
+            return truncated;
+        }
+        ObjectNode source = (ObjectNode) item;
+        ObjectNode limited = json.createObjectNode();
+        
+        java.util.Iterator<java.util.Map.Entry<String, JsonNode>> fields = source.fields();
+        while (fields.hasNext()) {
+            java.util.Map.Entry<String, JsonNode> entry = fields.next();
+            JsonNode value = entry.getValue();
+            if (value.isTextual()) {
+                limited.put(entry.getKey(), truncateText(value.asText()));
+            } else {
+                limited.set(entry.getKey(), value);
+            }
+        }
+        
+        limited.put("truncated", true);
+        limited.put("originalBytes", jsonBytes(item));
+        limited.put("maxItemBytes", properties.maxItemBytes());
+        stats.truncatedItems++;
+        stats.limited = true;
+        if (jsonBytes(limited) <= properties.maxItemBytes()) {
+            return limited;
+        }
+        return fallbackTruncatedItem(item);
+    }
+
+    private ObjectNode fallbackTruncatedItem(JsonNode item) {
+        ObjectNode fallback = json.createObjectNode();
+        fallback.put("truncated", true);
+        fallback.put("originalBytes", jsonBytes(item));
+        fallback.put("maxItemBytes", properties.maxItemBytes());
+        if (item.isObject()) {
+            ArrayNode fieldNames = json.createArrayNode();
+            java.util.Iterator<String> fieldNamesIter = item.fieldNames();
+            while (fieldNamesIter.hasNext()) {
+                fieldNames.add(fieldNamesIter.next());
+            }
+            fallback.set("fieldNames", fieldNames);
+        }
+        return fallback;
+    }
+
+    private String truncateText(String value) {
+        if (value == null) {
+            return "";
+        }
+        int maxChars = Math.min(value.length(), 256);
+        String truncated = value.substring(0, maxChars);
+        while (truncated.length() > 16 && truncated.getBytes(java.nio.charset.StandardCharsets.UTF_8).length > properties.maxItemBytes() / 2) {
+            truncated = truncated.substring(0, truncated.length() / 2);
+        }
+        return truncated + "...";
+    }
+
+    private ObjectNode copyWithout(ObjectNode source, String... excludedFields) {
+        ObjectNode copy = json.createObjectNode();
+        
+        java.util.Iterator<java.util.Map.Entry<String, JsonNode>> fields = source.fields();
+        while (fields.hasNext()) {
+            java.util.Map.Entry<String, JsonNode> entry = fields.next();
+            if (!excluded(entry.getKey(), excludedFields)) {
+                copy.set(entry.getKey(), entry.getValue());
+            }
+        }
+        
+        return copy;
+    }
+
+    private boolean excluded(String field, String[] excludedFields) {
+        for (String excluded : excludedFields) {
+            if (excluded.equals(field)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    private String summary(ObjectNode response, int originalCount, int previewCount) {
+        long totalCount = response.path("totalCount").asLong(originalCount);
+        return "Returned " + previewCount + " preview item(s) out of " + totalCount + " total result(s).";
+    }
+
+    private long jsonBytes(JsonNode node) {
+        try {
+            return json.writeValueAsBytes(node).length;
+        } catch (Exception error) {
+            return Long.MAX_VALUE;
+        }
+    }
+
+    private static final class BudgetStats {
+        private boolean limited;
+        private int omittedItems;
+        private int truncatedItems;
+    }
+}

axhub-gateway/src/main/java/io/shinhanlife/axhub/biz/mcp/gateway/tool/large/LargeToolResponseService.java

@@ -0,0 +1,347 @@
+package io.shinhanlife.axhub.biz.mcp.gateway.tool.large;
+
+import io.shinhanlife.axhub.biz.mcp.gateway.config.McpGatewayProperties;
+import io.shinhanlife.axhub.biz.mcp.gateway.guardrail.SensitiveDataMasker;
+import io.shinhanlife.axhub.biz.mcp.gateway.resilience.FailureType;
+import io.shinhanlife.axhub.biz.mcp.gateway.resilience.ToolExecutionException;
+import org.springframework.stereotype.Service;
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.node.ArrayNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+
+import java.time.Duration;
+import java.time.Instant;
+
+@Service
+public class LargeToolResponseService {
+    private final McpGatewayProperties properties;
+    private final ObjectMapper json;
+    private final SensitiveDataMasker masker;
+    private final AgentResponseBudgetService agentBudget;
+
+    public LargeToolResponseService(McpGatewayProperties properties,
+                                    ObjectMapper json,
+                                    SensitiveDataMasker masker,
+                                    AgentResponseBudgetService agentBudget) {
+        this.properties = properties;
+        this.json = json;
+        this.masker = masker;
+        this.agentBudget = agentBudget;
+    }
+
+    public Collector newCollector(String toolName, String requestId) {
+        return new Collector(toolName, requestId);
+    }
+
+    public ObjectNode tooLargeResult(String toolName, String requestId, long receivedBytes, String nextCursor) {
+        ObjectNode response = basePartialResponse(toolName, requestId);
+        response.put("failureType", FailureType.TOO_LARGE_RESULT.name());
+        response.put("errorCode", "TOOL_RESULT_TOO_LARGE");
+        response.put("message", "Tool 응답이 허용 크기를 초과했습니다. 원문 body는 저장하지 않았고 cursor/resultRef 기반 재조회가 필요합니다.");
+        response.put("receivedBytes", receivedBytes);
+        response.put("maxResponseBytesFromTool", properties.maxResponseBytesFromTool());
+        response.put("hasMore", true);
+        response.put("nextCursor", safe(nextCursor));
+        response.put("resultRef", resultRef(toolName, requestId, nextCursor));
+        response.put("truncated", true);
+        response.put("omittedCount", 0);
+        response.set("previewItems", json.createArrayNode());
+        response.set("streamEvents", streamEvents(toolName, 0, 0, true, nextCursor));
+        attachPageInfoAndStructuredContent(response);
+        return agentBudget.apply(response);
+    }
+
+    private ObjectNode basePartialResponse(String toolName, String requestId) {
+        ObjectNode response = json.createObjectNode();
+        response.put("success", true);
+        response.put("toolName", toolName);
+        response.put("requestId", requestId);
+        response.put("status", "PARTIAL_RESULT");
+        response.put("pageSize", pageSize());
+        response.put("pageCount", 0);
+        response.put("returnedCount", 0);
+        response.put("totalCount", 0);
+        response.put("hasMore", false);
+        response.put("nextCursor", "");
+        response.put("truncated", false);
+        response.put("omittedCount", 0);
+        response.put("maxStreamBytes", properties.maxStreamBytes());
+        response.put("maxItemBytes", properties.largeResponseMaxItemBytes());
+        return response;
+    }
+
+    private ArrayNode streamEvents(String toolName, int pageCount, int returnedCount, boolean hasMore, String nextCursor) {
+        ArrayNode events = json.createArrayNode();
+        ObjectNode start = json.createObjectNode();
+        start.put("type", "start");
+        start.put("tool", toolName);
+        events.add(start);
+
+        ObjectNode summary = json.createObjectNode();
+        summary.put("type", "summary");
+        summary.put("pageCount", pageCount);
+        summary.put("returnedCount", returnedCount);
+        summary.put("message", returnedCount + "건의 preview를 생성했습니다.");
+        events.add(summary);
+
+        ObjectNode done = json.createObjectNode();
+        done.put("type", "done");
+        done.put("hasMore", hasMore);
+        done.put("nextCursor", safe(nextCursor));
+        events.add(done);
+        return events;
+    }
+
+    private String resultRef(String toolName, String requestId, String nextCursor) {
+        if (nextCursor == null || nextCursor.isBlank()) {
+            return "tool-result:" + toolName + ":" + requestId;
+        }
+        return "tool-result:" + toolName + ":" + requestId + ":cursor:" + nextCursor;
+    }
+
+    private int pageSize() {
+        return Math.min(properties.defaultPageSize(), properties.maxPageSize());
+    }
+
+    private String safe(String value) {
+        return value == null ? "" : value;
+    }
+
+    public class Collector {
+        private final String toolName;
+        private final String requestId;
+        private final Instant startedAt = Instant.now();
+        private final ArrayNode previewItems = json.createArrayNode();
+        private final ArrayNode streamEvents = json.createArrayNode();
+        private int pageCount;
+        private int returnedCount;
+        private long totalCount;
+        private boolean paginated;
+        private boolean hasMore;
+        private String nextCursor = "";
+        private String stopReason = "";
+        private JsonNode normalData;
+        private boolean truncated;
+        private int omittedCount;
+
+        private Collector(String toolName, String requestId) {
+            this.toolName = toolName;
+            this.requestId = requestId;
+            ObjectNode start = json.createObjectNode();
+            start.put("type", "start");
+            start.put("tool", toolName);
+            streamEvents.add(start);
+        }
+
+        public void accept(JsonNode data) {
+            if (data == null || data.isMissingNode() || data.isNull()) {
+                throw new ToolExecutionException(FailureType.BUSINESS_ERROR, "Tool response data is empty. tool=" + toolName);
+            }
+            Page page = pageFrom(data);
+            if (!page.paginated() && pageCount == 0 && count(page.items()) <= pageSize()) {
+                JsonNode masked = masker.mask(data);
+                normalData = masked;
+                pageCount = 1;
+                returnedCount = count(page.items());
+                totalCount = returnedCount;
+                return;
+            }
+
+            paginated = true;
+            pageCount++;
+            totalCount = page.totalCount() >= 0 ? page.totalCount() : totalCount;
+            hasMore = page.hasMore();
+            nextCursor = page.nextCursor();
+
+            int pageItemCount = 0;
+            for (JsonNode item : page.items()) {
+                pageItemCount++;
+                JsonNode preview = previewItem(item);
+                if (previewItems.size() < maxPreviewItems() && canAddPreviewItem(preview)) {
+                    previewItems.add(preview);
+                    returnedCount++;
+                } else {
+                    omittedCount++;
+                    truncated = true;
+                }
+            }
+
+            ObjectNode summary = json.createObjectNode();
+            summary.put("type", "summary");
+            summary.put("page", pageCount);
+            summary.put("count", pageItemCount);
+            summary.put("returnedCount", returnedCount);
+            summary.put("omittedCount", omittedCount);
+            summary.put("nextCursor", nextCursor());
+            summary.put("message", returnedCount + " items previewed");
+            addStreamEvent(summary);
+
+            if (pageCount >= properties.maxPagesPerCall() && hasMore) {
+                stopReason = "MAX_PAGES_PER_CALL";
+                truncated = true;
+            }
+            if (Duration.between(startedAt, Instant.now()).toSeconds() >= properties.maxDurationSeconds() && hasMore) {
+                stopReason = "MAX_DURATION_SECONDS";
+                truncated = true;
+            }
+        }
+
+        public boolean shouldFetchNextPage() {
+            return paginated
+                    && hasMore
+                    && nextCursor != null
+                    && !nextCursor.isBlank()
+                    && pageCount < properties.maxPagesPerCall()
+                    && Duration.between(startedAt, Instant.now()).toSeconds() < properties.maxDurationSeconds()
+                    && currentResponseBytes() < properties.maxStreamBytes();
+        }
+
+        public String nextCursor() {
+            return safe(nextCursor);
+        }
+
+        public int pageSize() {
+            return LargeToolResponseService.this.pageSize();
+        }
+
+        public ObjectNode finish() {
+            if (normalData != null) {
+                ObjectNode wrap = json.createObjectNode();
+                wrap.put("success", true);
+                wrap.put("toolName", toolName);
+                wrap.put("requestId", requestId);
+                wrap.set("data", normalData);
+                return wrap;
+            }
+
+            ObjectNode done = json.createObjectNode();
+            done.put("type", "done");
+            done.put("totalCount", totalCount);
+            done.put("hasMore", hasMore);
+            done.put("nextCursor", nextCursor());
+            addStreamEvent(done);
+
+            ObjectNode response = basePartialResponse(toolName, requestId);
+            response.put("pageCount", pageCount);
+            response.put("returnedCount", returnedCount);
+            response.put("totalCount", totalCount);
+            response.put("hasMore", hasMore);
+            response.put("nextCursor", nextCursor());
+            response.put("resultRef", resultRef(toolName, requestId, nextCursor()));
+            response.put("truncated", truncated);
+            response.put("omittedCount", omittedCount);
+            response.put("message", stopReason.isBlank()
+                    ? "대량 결과라 일부 preview만 반환했습니다."
+                    : "대량 결과라 " + stopReason + " 조건에서 중단하고 일부 preview만 반환했습니다.");
+            response.set("previewItems", previewItems);
+            response.set("streamEvents", streamEvents);
+            attachPageInfoAndStructuredContent(response);
+            return agentBudget.apply(response);
+        }
+
+        private Page pageFrom(JsonNode data) {
+            if (data.isObject() && data.path("items").isArray()) {
+                return new Page(true, data.path("items"), data.path("nextCursor").asText(""),
+                        data.path("hasMore").asBoolean(false), data.path("totalCount").asLong(-1));
+            }
+            if (data.isArray()) {
+                return new Page(false, data, "", false, count(data));
+            }
+            ArrayNode one = json.createArrayNode();
+            one.add(data);
+            return new Page(false, one, "", false, 1);
+        }
+
+        private JsonNode previewItem(JsonNode item) {
+            JsonNode masked = masker.mask(item);
+            long itemBytes = jsonBytes(masked);
+            if (itemBytes <= properties.largeResponseMaxItemBytes()) {
+                return masked;
+            }
+            truncated = true;
+            ObjectNode preview = json.createObjectNode();
+            preview.put("truncated", true);
+            preview.put("originalBytes", itemBytes);
+            preview.put("maxItemBytes", properties.largeResponseMaxItemBytes());
+            if (masked.isObject()) {
+                ArrayNode fieldNames = json.createArrayNode();
+                java.util.Iterator<String> fieldNamesIter = masked.fieldNames();
+                while (fieldNamesIter.hasNext()) {
+                    fieldNames.add(fieldNamesIter.next());
+                }
+                preview.set("fieldNames", fieldNames);
+            }
+            return preview;
+        }
+
+        private boolean canAddPreviewItem(JsonNode item) {
+            return jsonBytes(item) <= properties.largeResponseMaxItemBytes()
+                    && currentResponseBytes() + jsonBytes(item) <= properties.maxStreamBytes();
+        }
+
+        private void addStreamEvent(ObjectNode event) {
+            if (currentResponseBytes() + jsonBytes(event) <= properties.maxStreamBytes()) {
+                streamEvents.add(event);
+                return;
+            }
+            truncated = true;
+        }
+
+        private int maxPreviewItems() {
+            return Math.min(pageSize() * properties.maxPagesPerCall(), properties.largeResponseMaxPreviewItems());
+        }
+
+        private long currentResponseBytes() {
+            ObjectNode estimate = json.createObjectNode();
+            estimate.set("previewItems", previewItems);
+            estimate.set("streamEvents", streamEvents);
+            return jsonBytes(estimate);
+        }
+
+        private long jsonBytes(JsonNode node) {
+            try {
+                return json.writeValueAsBytes(node).length;
+            } catch (Exception error) {
+                return Long.MAX_VALUE;
+            }
+        }
+
+        private int count(JsonNode node) {
+            int count = 0;
+            java.util.Iterator<JsonNode> iter = node.elements();
+            while(iter.hasNext()) {
+                iter.next();
+                count++;
+            }
+            return count;
+        }
+    }
+
+    private record Page(boolean paginated, JsonNode items, String nextCursor, boolean hasMore, long totalCount) {}
+
+    private void attachPageInfoAndStructuredContent(ObjectNode response) {
+        ObjectNode pageInfo = json.createObjectNode();
+        pageInfo.put("pageSize", response.path("pageSize").asInt(pageSize()));
+        pageInfo.put("pageCount", response.path("pageCount").asInt(0));
+        pageInfo.put("returnedCount", response.path("returnedCount").asInt(0));
+        pageInfo.put("totalCount", response.path("totalCount").asLong(0));
+        pageInfo.put("hasMore", response.path("hasMore").asBoolean(false));
+        pageInfo.put("nextCursor", response.path("nextCursor").asText(""));
+        response.set("pageInfo", pageInfo);
+
+        ObjectNode summary = json.createObjectNode();
+        summary.put("status", response.path("status").asText("PARTIAL_RESULT"));
+        summary.put("toolName", response.path("toolName").asText(""));
+        summary.put("message", response.path("message").asText(""));
+        summary.put("truncated", response.path("truncated").asBoolean(false));
+        summary.put("omittedCount", response.path("omittedCount").asInt(0));
+        summary.put("resultRef", response.path("resultRef").asText(""));
+
+        ObjectNode structuredContent = json.createObjectNode();
+        structuredContent.set("summary", summary);
+        structuredContent.set("pageInfo", pageInfo.deepCopy());
+        structuredContent.set("previewItems", response.path("previewItems").deepCopy());
+        response.set("structuredContent", structuredContent);
+    }
+}

axhub-gateway/src/main/java/io/shinhanlife/axhub/biz/mcp/gateway/tool/large/PaginationRequestValidator.java

@@ -0,0 +1,101 @@
+package io.shinhanlife.axhub.biz.mcp.gateway.tool.large;
+
+import io.shinhanlife.axhub.biz.mcp.gateway.config.McpGatewayProperties;
+import io.shinhanlife.axhub.biz.mcp.gateway.resilience.FailureType;
+import io.shinhanlife.axhub.biz.mcp.gateway.resilience.ToolExecutionException;
+import org.springframework.stereotype.Component;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+
+/**
+ * Tool 서버로 전달할 pagination 요청값을 MCP 정책 기준으로 검증하고 보정합니다.
+ */
+@Component
+public class PaginationRequestValidator {
+    private static final int MAX_CURSOR_LENGTH = 2048;
+
+    private final McpGatewayProperties properties;
+    private final ObjectMapper json;
+
+    public PaginationRequestValidator(McpGatewayProperties properties, ObjectMapper json) {
+        this.properties = properties;
+        this.json = json;
+    }
+
+    /**
+     * pageSize/cursor를 검증한 뒤 Tool 서버에 넘길 안전한 arguments 복사본을 만듭니다.
+     */
+    public ObjectNode normalize(ObjectNode arguments) {
+        try {
+            ObjectNode normalized = arguments == null
+                    ? json.createObjectNode()
+                    : (ObjectNode) json.readTree(json.writeValueAsString(arguments));
+            normalizePageSize(normalized);
+            validateCursor(normalized);
+            return normalized;
+        } catch (ToolExecutionException error) {
+            throw error;
+        } catch (Exception error) {
+            throw standardError("INVALID_PAGINATION_REQUEST",
+                    "Pagination 요청값을 검증하는 중 오류가 발생했습니다.",
+                    detail("cause", error.getMessage()));
+        }
+    }
+
+    private void normalizePageSize(ObjectNode normalized) {
+        int pageSize = normalized.has("pageSize")
+                ? normalized.path("pageSize").asInt(-1)
+                : properties.defaultPageSize();
+        if (pageSize < 1) {
+            throw standardError("INVALID_PAGINATION_REQUEST",
+                    "pageSize는 1 이상이어야 합니다.",
+                    detail("requestedPageSize", pageSize));
+        }
+        if (pageSize > properties.maxPageSize()) {
+            ObjectNode detail = detail("requestedPageSize", pageSize);
+            detail.put("maxPageSize", properties.maxPageSize());
+            detail.put("suggestedPageSize", properties.defaultPageSize());
+            throw standardError("PAGE_SIZE_EXCEEDED",
+                    "요청한 pageSize가 MCP 최대 허용값을 초과했습니다.",
+                    detail);
+        }
+        normalized.put("pageSize", pageSize);
+    }
+
+    private void validateCursor(ObjectNode normalized) {
+        if (!normalized.has("cursor")) {
+            return;
+        }
+        String cursor = normalized.path("cursor").asText("");
+        if (cursor.length() > MAX_CURSOR_LENGTH) {
+            ObjectNode detail = detail("cursorLength", cursor.length());
+            detail.put("maxCursorLength", MAX_CURSOR_LENGTH);
+            throw standardError("INVALID_CURSOR",
+                    "cursor 값이 너무 깁니다.",
+                    detail);
+        }
+    }
+
+    private ToolExecutionException standardError(String code, String message, ObjectNode detail) {
+        ObjectNode error = json.createObjectNode();
+        error.put("isError", true);
+        error.put("errorCode", code);
+        error.put("message", message);
+        error.set("details", detail);
+        try {
+            return new ToolExecutionException(FailureType.CLIENT_ERROR, json.writeValueAsString(error));
+        } catch (Exception serializeError) {
+            return new ToolExecutionException(FailureType.CLIENT_ERROR, code + ": " + message);
+        }
+    }
+
+    private ObjectNode detail(String name, Object value) {
+        ObjectNode detail = json.createObjectNode();
+        if (value instanceof Number number) {
+            detail.put(name, number.longValue());
+        } else {
+            detail.put(name, value == null ? "" : String.valueOf(value));
+        }
+        return detail;
+    }
+}

axhub-gateway/src/test/java/io/shinhanlife/axhub/biz/mcp/gateway/AxHubGatewayApplicationTests.java

@@ -0,0 +1,27 @@
+package io.shinhanlife.axhub.biz.mcp.gateway;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.ActiveProfiles;
+import org.springframework.test.context.bean.override.mockito.MockitoBean;
+import io.shinhanlife.axhub.biz.mcp.gateway.audit.AuditLogService;
+import io.shinhanlife.axhub.biz.mcp.gateway.redis.RedisToolTraceService;
+
+@SpringBootTest
+@ActiveProfiles("test")
+class AxHubGatewayApplicationTests {
+
+    // Mock components that might require external dependencies (like Redis/DB) to pass the context load
+    @MockitoBean
+    private RedisToolTraceService redisToolTraceService;
+
+    @MockitoBean
+    private AuditLogService auditLogService;
+
+    @Test
+    void contextLoads() {
+        // This test ensures that all Spring beans, @ConfigurationProperties, and dependencies are correctly wired.
+        // It validates that the ported classes (ExecuteService, AgentResponseBudgetService, LargeToolResponseService, etc.)
+        // have no @Autowired or initialization errors.
+    }
+}

axhub-gateway/src/test/java/io/shinhanlife/axhub/biz/mcp/gateway/tool/large/PaginationRequestValidatorTest.java

@@ -0,0 +1,67 @@
+package io.shinhanlife.axhub.biz.mcp.gateway.tool.large;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import io.shinhanlife.axhub.biz.mcp.gateway.config.McpGatewayProperties;
+import io.shinhanlife.axhub.biz.mcp.gateway.resilience.ToolExecutionException;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class PaginationRequestValidatorTest {
+
+    private PaginationRequestValidator validator;
+    private ObjectMapper json;
+    private McpGatewayProperties properties;
+
+    @BeforeEach
+    void setUp() {
+        properties = new McpGatewayProperties();
+        properties.setDefaultPageSize(100);
+        properties.setMaxPageSize(500);
+        json = new ObjectMapper();
+        validator = new PaginationRequestValidator(properties, json);
+    }
+
+    @Test
+    void shouldSetDefaultPageSizeIfMissing() {
+        ObjectNode arguments = json.createObjectNode();
+        ObjectNode normalized = validator.normalize(arguments);
+        
+        assertEquals(100, normalized.get("pageSize").asInt());
+    }
+
+    @Test
+    void shouldKeepValidPageSize() {
+        ObjectNode arguments = json.createObjectNode();
+        arguments.put("pageSize", 200);
+        ObjectNode normalized = validator.normalize(arguments);
+        
+        assertEquals(200, normalized.get("pageSize").asInt());
+    }
+
+    @Test
+    void shouldThrowIfPageSizeTooLarge() {
+        ObjectNode arguments = json.createObjectNode();
+        arguments.put("pageSize", 600);
+        
+        ToolExecutionException exception = assertThrows(ToolExecutionException.class, () -> {
+            validator.normalize(arguments);
+        });
+        
+        assertTrue(exception.getMessage().contains("PAGE_SIZE_EXCEEDED"));
+    }
+
+    @Test
+    void shouldThrowIfCursorTooLong() {
+        ObjectNode arguments = json.createObjectNode();
+        arguments.put("cursor", "a".repeat(3000));
+        
+        ToolExecutionException exception = assertThrows(ToolExecutionException.class, () -> {
+            validator.normalize(arguments);
+        });
+        
+        assertTrue(exception.getMessage().contains("INVALID_CURSOR"));
+    }
+}