From 1810a474a204ff937e01d0bcc3d712b7add25387 Mon Sep 17 00:00:00 2001
From: Linus Rath <139418639+rathlinus@users.noreply.github.com>
Date: Wed, 22 Apr 2026 00:00:01 +0200
Subject: [PATCH] fix: enhance error message for mailbox creation failure

---
 lib/jmap/client.ts | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/lib/jmap/client.ts b/lib/jmap/client.ts
index ac90a057..0a0685e7 100644
--- a/lib/jmap/client.ts
+++ b/lib/jmap/client.ts
@@ -1316,7 +1316,13 @@ export class JMAPClient implements IJMAPClient {
 
     const result = response.methodResponses?.[0]?.[1];
     if (result?.notCreated?.[createId]) {
-      throw new Error(`Failed to create mailbox: ${result.notCreated[createId].type || 'unknown error'}`);
+      const err = result.notCreated[createId];
+      const details = [err.type || 'unknown error'];
+      if (Array.isArray(err.properties) && err.properties.length > 0) {
+        details.push(`properties=[${err.properties.join(', ')}]`);
+      }
+      if (err.description) details.push(err.description);
+      throw new Error(`Failed to create mailbox: ${details.join(' — ')}`);
     }
 
     const created = result?.created?.[createId];