Feat: The agent operator and message operator can only select string variables as prompt words. #10427 (#11054)

### What problem does this PR solve?

Feat: The agent operator and message operator can only select string
variables as prompt words. #10427
### Type of change


- [x] New Feature (non-breaking change which adds functionality)

web/src/pages/agent/form/agent-form/index.tsx

@@ -26,6 +26,7 @@ import { useTranslation } from 'react-i18next';
 import { z } from 'zod';
 import {
   AgentExceptionMethod,
+  JsonSchemaDataType,
   NodeHandleId,
   VariableType,
   initialAgentValues,
@@ -157,6 +158,7 @@ function AgentForm({ node }: INextOperatorForm) {
                     placeholder={t('flow.messagePlaceholder')}
                     showToolbar={true}
                     extraOptions={extraOptions}
+                    types={[JsonSchemaDataType.String]}
                   ></PromptEditor>
                 </FormControl>
               </FormItem>
@@ -174,6 +176,7 @@ function AgentForm({ node }: INextOperatorForm) {
                       <PromptEditor
                         {...field}
                         showToolbar={true}
+                        types={[JsonSchemaDataType.String]}
                       ></PromptEditor>
                     </section>
                   </FormControl>