agent auto model

Author: Sg312

apps/sim/blocks/blocks/agent.ts

@@ -523,12 +523,13 @@ Return ONLY the JSON array.`,
         if (!model) {
           throw new Error('No model selected')
         }
-        // sim-auto resolves to a concrete model at execution time; this
-        // serialization-time lookup only needs a stable provider tool id.
-        if (isAutoModel(model)) {
-          return 'anthropic_chat'
-        }
-        const tool = getBaseModelProviders()[model]
+        // sim-auto resolves to a concrete pool model at execution time, where
+        // the agent handler derives the provider from the resolved model and
+        // never reads this serialized value. Serialization still needs the
+        // same provider-id shape every other model stores, so look up the
+        // runtime fallback model's provider.
+        const lookupModel = isAutoModel(model) ? 'claude-sonnet-5' : model
+        const tool = getBaseModelProviders()[lookupModel]
         if (!tool) {
           throw new Error(`Invalid model selected: ${model}`)
         }