From 11e92764983d92ab5819fac952f9f364948caa15 Mon Sep 17 00:00:00 2001
From: cpkt9762 <cpkt9762@163.com>
Date: Fri, 13 Mar 2026 04:15:17 +0800
Subject: [PATCH] fix(delegate-task): build categoryModel with variant for
 categories without fallback chain

When a category has no CATEGORY_MODEL_REQUIREMENTS entry (e.g.
user-defined categories like solana-re), the !requirement branch
set actualModel but never built categoryModel with variant from
the user config. The bottom fallback then created categoryModel
via parseModelString alone, silently dropping the variant.

Mirror the requirement branch logic: read variant from
userCategories and resolved.config, and build categoryModel
with it.

Fixes #2538
---
 src/tools/delegate-task/category-resolver.ts | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/tools/delegate-task/category-resolver.ts b/src/tools/delegate-task/category-resolver.ts
index 01901ec8c..b00c2e9e9 100644
--- a/src/tools/delegate-task/category-resolver.ts
+++ b/src/tools/delegate-task/category-resolver.ts
@@ -98,6 +98,11 @@ Available categories: ${allCategoryNames}`,
       modelInfo = explicitCategoryModel || overrideModel
         ? { model: actualModel, type: "user-defined", source: "override" }
         : { model: actualModel, type: "system-default", source: "system-default" }
+      const parsedModel = parseModelString(actualModel)
+      const variantToUse = userCategories?.[args.category!]?.variant ?? resolved.config.variant
+      categoryModel = parsedModel
+        ? (variantToUse ? { ...parsedModel, variant: variantToUse } : parsedModel)
+        : undefined
     }
   } else {
     const resolution = resolveModelForDelegateTask({