From 1722cfc28222f5259a717a52aaeb63b0a44c1a5c Mon Sep 17 00:00:00 2001
From: LiusCraft <liuscraft@qq.com>
Date: Thu, 30 Apr 2026 02:24:29 +0800
Subject: [PATCH] feat: add DeepSeek vision unsupported error detection

Add detection for 'unknown variant' + 'image_url' error pattern used by
DeepSeek and other strict providers when vision is not supported.
These providers reject the image_url field at the JSON schema level
rather than returning a semantic 'not supported' message.
---
 pkg/agent/llm_media.go | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/pkg/agent/llm_media.go b/pkg/agent/llm_media.go
index eb1908777..31692174b 100644
--- a/pkg/agent/llm_media.go
+++ b/pkg/agent/llm_media.go
@@ -56,5 +56,12 @@ func isVisionUnsupportedError(err error) bool {
 		return true
 	}
 
+	// DeepSeek and other strict providers reject the image_url field at the
+	// JSON schema level with an "unknown variant" error rather than a semantic
+	// "not supported" message.
+	if strings.Contains(msg, "unknown variant") && strings.Contains(msg, "image_url") {
+		return true
+	}
+
 	return false
 }