diff --git a/src/features/agent-attachments/core/domain/capabilities.ts b/src/features/agent-attachments/core/domain/capabilities.ts
index d039587a..279e1560 100644
--- a/src/features/agent-attachments/core/domain/capabilities.ts
+++ b/src/features/agent-attachments/core/domain/capabilities.ts
@@ -1,7 +1,7 @@
 import type {
   AgentAttachmentCapability,
   AgentAttachmentCapabilityTarget,
-  ProviderImageMimeType,
+  AgentImageMimeType,
 } from './types';
 
 const DEFAULT_IMAGE_BYTES_PER_PROVIDER = 4 * 1024 * 1024;
@@ -18,7 +18,7 @@ export const CLAUDE_IMAGE_MIME_TYPES = [
 
 function supportedImagesOnly(
   displayText: string,
-  supportedImageMimeTypes: readonly ProviderImageMimeType[] = NATIVE_IMAGE_MIME_TYPES
+  supportedImageMimeTypes: readonly AgentImageMimeType[] = NATIVE_IMAGE_MIME_TYPES
 ): AgentAttachmentCapability {
   return {
     supportsImages: true,
diff --git a/src/features/agent-attachments/core/domain/types.ts b/src/features/agent-attachments/core/domain/types.ts
index cf30d3e6..1e0b3e09 100644
--- a/src/features/agent-attachments/core/domain/types.ts
+++ b/src/features/agent-attachments/core/domain/types.ts
@@ -3,7 +3,6 @@ export const AGENT_ATTACHMENT_SCHEMA_VERSION = 1 as const;
 export type AgentAttachmentKind = 'image' | 'file' | 'unsupported';
 
 export type AgentImageMimeType = 'image/png' | 'image/jpeg' | 'image/gif' | 'image/webp';
-export type ProviderImageMimeType = AgentImageMimeType;
 export type ProviderFileMimeType = 'application/pdf' | 'text/*';
 
 export type AttachmentDeliveryFailureCode =
@@ -98,7 +97,7 @@ export interface AgentAttachmentCapabilityTarget {
 export interface AgentAttachmentCapability {
   supportsImages: boolean;
   supportsFiles: boolean;
-  supportedImageMimeTypes: ProviderImageMimeType[];
+  supportedImageMimeTypes: AgentImageMimeType[];
   supportedFileMimeTypes: ProviderFileMimeType[];
   maxImages: number;
   maxFiles: number;
diff --git a/src/features/agent-attachments/core/domain/validation.ts b/src/features/agent-attachments/core/domain/validation.ts
index 74805ae3..6e63e6aa 100644
--- a/src/features/agent-attachments/core/domain/validation.ts
+++ b/src/features/agent-attachments/core/domain/validation.ts
@@ -7,7 +7,6 @@ import type {
   AgentImageMimeType,
   AttachmentValidationResult,
   ImageOptimizationBudget,
-  ProviderImageMimeType,
 } from './types';
 
 const AGENT_IMAGE_MIME_TYPES = new Set<AgentImageMimeType>([
@@ -23,7 +22,7 @@ const OPTIMIZABLE_AGENT_IMAGE_MIME_TYPES = new Set<Exclude<AgentImageMimeType, '
   'image/webp',
 ]);
 
-const PROVIDER_IMAGE_MIME_TYPES = new Set<ProviderImageMimeType>([
+const PROVIDER_IMAGE_MIME_TYPES = new Set<AgentImageMimeType>([
   'image/png',
   'image/jpeg',
   'image/gif',
@@ -34,8 +33,8 @@ export function isAgentImageMimeType(mimeType: string): mimeType is AgentImageMi
   return AGENT_IMAGE_MIME_TYPES.has(mimeType as AgentImageMimeType);
 }
 
-export function isProviderImageMimeType(mimeType: string): mimeType is ProviderImageMimeType {
-  return PROVIDER_IMAGE_MIME_TYPES.has(mimeType as ProviderImageMimeType);
+export function isProviderImageMimeType(mimeType: string): mimeType is AgentImageMimeType {
+  return PROVIDER_IMAGE_MIME_TYPES.has(mimeType as AgentImageMimeType);
 }
 
 function isOptimizableAgentImageMimeType(
@@ -54,9 +53,9 @@ function isProviderFileMimeType(mimeType: string, supported: readonly string[]):
 
 function isCapabilityImageMimeType(
   mimeType: string,
-  supported: readonly ProviderImageMimeType[]
+  supported: readonly AgentImageMimeType[]
 ): boolean {
-  return supported.includes(mimeType as ProviderImageMimeType);
+  return supported.includes(mimeType as AgentImageMimeType);
 }
 
 export function classifyAttachmentMime(mimeType: string): AgentAttachmentKind {