diff --git a/dap-gateway/src/main/resources/static/admin/scaffold.html b/dap-gateway/src/main/resources/static/admin/scaffold.html
index fe1a622f..9e2eb79d 100644
--- a/dap-gateway/src/main/resources/static/admin/scaffold.html
+++ b/dap-gateway/src/main/resources/static/admin/scaffold.html
@@ -506,6 +506,7 @@
                                 <div class="d-flex justify-content-between align-items-center mb-1">
                                     <label class="form-label mb-0">Input Fields (JSON)</label>
                                     <div class="d-flex gap-1">
+                                        <button type="button" class="btn-secondary-action" style="padding: 0.2rem 0.45rem; font-size: 0.72rem;" onclick="openFieldEditor('inputFields')">필드 편집</button>
                                         <button type="button" class="btn-secondary-action" style="padding: 0.2rem 0.45rem; font-size: 0.72rem;" onclick="loadFieldExample('inputFields')">예제 넣기</button>
                                         <button type="button" class="btn-secondary-action" style="padding: 0.2rem 0.45rem; font-size: 0.72rem;" onclick="copyFieldJson('inputFields')">복사</button>
                                     </div>
@@ -516,6 +517,7 @@
                                 <div class="d-flex justify-content-between align-items-center mb-1">
                                     <label class="form-label mb-0">Output Fields (JSON)</label>
                                     <div class="d-flex gap-1">
+                                        <button type="button" class="btn-secondary-action" style="padding: 0.2rem 0.45rem; font-size: 0.72rem;" onclick="openFieldEditor('outputFields')">필드 편집</button>
                                         <button type="button" class="btn-secondary-action" style="padding: 0.2rem 0.45rem; font-size: 0.72rem;" onclick="loadFieldExample('outputFields')">예제 넣기</button>
                                         <button type="button" class="btn-secondary-action" style="padding: 0.2rem 0.45rem; font-size: 0.72rem;" onclick="copyFieldJson('outputFields')">복사</button>
                                     </div>
@@ -615,6 +617,41 @@
     <div id="resultBox"></div>
 </div>
 
+<!-- Field Editor Modal -->
+<div class="modal fade" id="fieldEditorModal" tabindex="-1" aria-labelledby="fieldEditorModalLabel" aria-hidden="true">
+  <div class="modal-dialog modal-xl modal-dialog-scrollable">
+    <div class="modal-content">
+      <div class="modal-header">
+        <h5 class="modal-title" id="fieldEditorModalLabel">필드 편집</h5>
+        <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
+      </div>
+      <div class="modal-body">
+        <p class="input-hint mt-0 mb-3">행을 추가해 필드를 입력하면 저장할 때 JSON으로 자동 변환됩니다.</p>
+        <div class="table-responsive">
+          <table class="table align-middle" id="fieldEditorTable">
+            <thead>
+              <tr>
+                <th style="min-width: 150px;">Name</th>
+                <th style="min-width: 125px;">Type</th>
+                <th style="min-width: 210px;">Description</th>
+                <th style="min-width: 180px;">Example</th>
+                <th style="min-width: 125px;">Required</th>
+                <th style="width: 1%;">삭제</th>
+              </tr>
+            </thead>
+            <tbody id="fieldEditorBody"></tbody>
+          </table>
+        </div>
+        <button type="button" class="btn-secondary-action" onclick="addFieldEditorRow()">+ 필드 추가</button>
+      </div>
+      <div class="modal-footer">
+        <button type="button" class="btn-secondary-action" data-bs-dismiss="modal" style="padding: 0.5rem 1rem; font-size: 0.875rem;">취소</button>
+        <button type="button" class="btn-action" onclick="applyFieldEditor()">JSON에 적용</button>
+      </div>
+    </div>
+  </div>
+</div>
+
 <!-- Edit Tool Modal -->
 <div class="modal fade" id="editToolModal" tabindex="-1" aria-labelledby="editToolModalLabel" aria-hidden="true">
   <div class="modal-dialog">
@@ -746,6 +783,112 @@
         }
     }
 
+    const fieldTypes = ['String', 'Integer', 'Long', 'Double', 'Boolean', 'BigDecimal'];
+    let fieldEditorTargetId = null;
+    let fieldEditorModalInstance = null;
+
+    function openFieldEditor(targetId) {
+        const textarea = document.getElementById(targetId);
+        let fields = [];
+        if (textarea.value.trim()) {
+            try {
+                fields = JSON.parse(textarea.value);
+                if (!Array.isArray(fields)) throw new Error('not an array');
+            } catch (error) {
+                alert('현재 JSON 형식이 올바르지 않습니다. JSON을 수정한 후 다시 열어주세요.');
+                return;
+            }
+        }
+
+        fieldEditorTargetId = targetId;
+        document.getElementById('fieldEditorModalLabel').textContent = targetId === 'inputFields'
+            ? 'Input Fields 편집'
+            : 'Output Fields 편집';
+        const body = document.getElementById('fieldEditorBody');
+        body.replaceChildren();
+        (fields.length ? fields : [{}]).forEach(addFieldEditorRow);
+
+        if (!fieldEditorModalInstance) {
+            fieldEditorModalInstance = new bootstrap.Modal(document.getElementById('fieldEditorModal'));
+        }
+        fieldEditorModalInstance.show();
+    }
+
+    function addFieldEditorRow(field = {}) {
+        const row = document.createElement('tr');
+        const makeInput = (value, placeholder) => {
+            const input = document.createElement('input');
+            input.type = 'text';
+            input.className = 'form-control form-control-sm';
+            input.value = value || '';
+            input.placeholder = placeholder;
+            return input;
+        };
+        const nameInput = makeInput(field.name, 'e.g. employeeId');
+        nameInput.dataset.field = 'name';
+        const descriptionInput = makeInput(field.description, 'e.g. Employee ID');
+        descriptionInput.dataset.field = 'description';
+        const exampleInput = makeInput(field.example, 'e.g. EMP10001');
+        exampleInput.dataset.field = 'example';
+
+        const typeSelect = document.createElement('select');
+        typeSelect.className = 'form-select form-select-sm';
+        typeSelect.dataset.field = 'type';
+        fieldTypes.forEach(type => {
+            const option = new Option(type, type, false, (field.type || 'String') === type);
+            typeSelect.add(option);
+        });
+
+        const requiredSelect = document.createElement('select');
+        requiredSelect.className = 'form-select form-select-sm';
+        requiredSelect.dataset.field = 'required';
+        requiredSelect.add(new Option('Required', 'true', false, field.required === true || field.required === 'true'));
+        requiredSelect.add(new Option('Optional', 'false', false, !(field.required === true || field.required === 'true')));
+
+        [nameInput, typeSelect, descriptionInput, exampleInput, requiredSelect].forEach(control => {
+            const cell = document.createElement('td');
+            cell.appendChild(control);
+            row.appendChild(cell);
+        });
+        const deleteCell = document.createElement('td');
+        const deleteButton = document.createElement('button');
+        deleteButton.type = 'button';
+        deleteButton.className = 'btn-secondary-action';
+        deleteButton.textContent = '삭제';
+        deleteButton.addEventListener('click', () => row.remove());
+        deleteCell.appendChild(deleteButton);
+        row.appendChild(deleteCell);
+        document.getElementById('fieldEditorBody').appendChild(row);
+    }
+
+    function applyFieldEditor() {
+        const rows = [...document.querySelectorAll('#fieldEditorBody tr')];
+        const names = new Set();
+        const fields = [];
+        for (const row of rows) {
+            const name = row.querySelector('[data-field="name"]').value.trim();
+            if (!name) continue;
+            if (!/^[A-Za-z_$][A-Za-z0-9_$]*$/.test(name)) {
+                alert(`필드명 "${name}"은(는) Java 필드명 형식으로 입력해주세요.`);
+                return;
+            }
+            if (names.has(name)) {
+                alert(`필드명 "${name}"이(가) 중복되었습니다.`);
+                return;
+            }
+            names.add(name);
+            fields.push({
+                name,
+                type: row.querySelector('[data-field="type"]').value,
+                description: row.querySelector('[data-field="description"]').value.trim(),
+                example: row.querySelector('[data-field="example"]').value.trim(),
+                required: row.querySelector('[data-field="required"]').value === 'true'
+            });
+        }
+        document.getElementById(fieldEditorTargetId).value = JSON.stringify(fields, null, 2);
+        fieldEditorModalInstance.hide();
+    }
+
     function loadToolList() {
         const tbody = document.getElementById('toolListBody');
         tbody.innerHTML = '<tr><td colspan="5" class="text-center py-5 text-muted">Loading data...</td></tr>';