From b47858b9815caf1e740bcbdadeafdb1e534820b7 Mon Sep 17 00:00:00 2001
From: Mathieu Velten <mathieu@velten.xyz>
Date: Fri, 20 Mar 2026 17:32:14 +0100
Subject: [PATCH] Add 413 error to /sendToDevice

---
 data/api/client-server/to_device.yaml | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/data/api/client-server/to_device.yaml b/data/api/client-server/to_device.yaml
index cea23ab7..98c0b3f3 100644
--- a/data/api/client-server/to_device.yaml
+++ b/data/api/client-server/to_device.yaml
@@ -82,6 +82,18 @@ paths:
               examples:
                 response:
                   value: {}
+        "413":
+          description: At least one device message is too large to fit in a single EDU.
+          content:
+            application/json:
+              schema:
+                $ref: definitions/errors/error.yaml
+              examples:
+                response:
+                  value: {
+                    "errcode": "M_TOO_LARGE",
+                    "error": "device message to @test:example.com too large to fit in a single EDU"
+                  }
       tags:
         - Send-to-Device messaging
 servers: