diff --git a/src/tools/builtin/messaging.ts b/src/tools/builtin/messaging.ts
index dc7e368..cc75314 100644
--- a/src/tools/builtin/messaging.ts
+++ b/src/tools/builtin/messaging.ts
@@ -22,6 +22,7 @@ function detectRole(): string {
 // Schemas
 const SendMessageSchema = z.object({
   to: z.enum(['admin-dev', 'api-dev', 'web-dev']),
+  from: z.enum(['admin-dev', 'api-dev', 'web-dev']).optional(),
   subject: z.string(),
   message: z.string(),
   data: z.record(z.any()).optional(),
@@ -46,8 +47,8 @@ export class SendMessageTool extends ToolHandler<SendMessageInput, any> {
   }
 
   protected async handle(input: SendMessageInput, _context: ToolContext): Promise<any> {
-    const { to, subject, message, data } = input;
-    const from = detectRole();
+    const { to, from: explicitFrom, subject, message, data } = input;
+    const from = explicitFrom || detectRole();
 
     const payload = {
       from,