fix(vanta): remove the MIME Type field whose value was always discarded

The block rendered an advanced MIME Type input and forwarded it as the
tool's mimeType, but the upload path never reads it: file-input.ts sets
`resolved.contentType || userFile.type || input.mimeType || …`, and every
return path of downloadServableFileFromStorage yields a non-empty content
type — a literal, getMimeTypeFromExtension's GENERIC_MIME_TYPE fallback,
or resolveServableDocBytes' constants and getContentType fallback. The
placeholder claimed it was 'used when the file has no type of its own',
which never happens.

Removes the subBlock, its mapper write and its inputs entry, and marks the
tool param hidden so it is no longer advertised to the model on a path
where it cannot take effect. The param itself stays, because the base64
branch still reads it.

Letting a typed value win instead was rejected: for a compiled artifact
the storage-resolved type is the only one matching the bytes actually
sent, so an override would break the case the resolver exists to fix.

Author: waleedlatif1

apps/docs/content/docs/en/integrations/vanta.mdx

@@ -331,7 +331,6 @@ Upload an evidence file to a Vanta document. Requires credentials with the vanta
 | `documentId` | string | Yes | Unique ID of the document to attach the file to |
 | `file` | file | No | The evidence file to upload |
 | `fileName` | string | No | Optional file name override |
-| `mimeType` | string | No | MIME type of the file \(e.g., application/pdf\). Used only for base64 uploads; ignored for a file from the File input, whose content type is always resolved from storage. |
 | `description` | string | No | Description of the uploaded evidence \(e.g., "Q3 access review evidence"\) |
 | `effectiveAtDate` | string | No | ISO 8601 date indicating when the document is effective from |
 

apps/sim/blocks/blocks/vanta.ts

@@ -286,14 +286,6 @@ export const VantaBlock: BlockConfig<ToolResponse> = {
       condition: { field: 'operation', value: 'upload_document_file' },
       mode: 'advanced',
     },
-    {
-      id: 'uploadMimeType',
-      title: 'MIME Type',
-      type: 'short-input',
-      placeholder: 'e.g., application/pdf (used when the file has no type of its own)',
-      condition: { field: 'operation', value: 'upload_document_file' },
-      mode: 'advanced',
-    },
     {
       id: 'uploadDescription',
       title: 'Description',
@@ -930,7 +922,6 @@ export const VantaBlock: BlockConfig<ToolResponse> = {
             const normalizedFile = normalizeFileInput(rest.file, { single: true })
             if (normalizedFile) result.file = normalizedFile
             result.fileName = optionalString(rest.uploadFileName)
-            result.mimeType = optionalString(rest.uploadMimeType)
             result.description = optionalString(rest.uploadDescription)
             result.effectiveAtDate = optionalString(rest.effectiveAtDate)
             break
@@ -993,10 +984,6 @@ export const VantaBlock: BlockConfig<ToolResponse> = {
     uploadedFileId: { type: 'string', description: 'Uploaded file ID' },
     file: { type: 'json', description: 'Evidence file to upload' },
     uploadFileName: { type: 'string', description: 'Optional file name override' },
-    uploadMimeType: {
-      type: 'string',
-      description: 'MIME type override used when the uploaded content has no type of its own',
-    },
     uploadDescription: { type: 'string', description: 'Description of the uploaded evidence' },
     effectiveAtDate: { type: 'string', description: 'Effective date of the document (ISO 8601)' },
     frameworkMatchesAny: { type: 'string', description: 'Comma-separated framework ID filters' },

apps/sim/tools/generated/tool-metadata.ts

@@ -62,9 +62,9 @@ export const vantaUploadDocumentFileTool: InternalToolConfig<
     mimeType: {
       type: 'string',
       required: false,
-      visibility: 'user-or-llm',
+      visibility: 'hidden',
       description:
-        'MIME type of the file (e.g., application/pdf). Used only for base64 uploads; ignored for a file from the File input, whose content type is always resolved from storage.',
+        'MIME type of the file (e.g., application/pdf). Applies only to the base64 upload path; a file from the File input always sends the content type resolved from storage.',
     },
     description: {
       type: 'string',