diff --git a/server-rs/crates/module-runtime/src/agc_models.rs b/server-rs/crates/module-runtime/src/agc_models.rs
index 4d3ebc735..b6aa1d710 100644
--- a/server-rs/crates/module-runtime/src/agc_models.rs
+++ b/server-rs/crates/module-runtime/src/agc_models.rs
@@ -144,26 +144,15 @@ impl AgcModelCatalog {
                 ));
             }
         }
-        self.resolve(&self.default_model_id).map(|_| ())
-    }
-
-    pub fn resolve(&self, id: &str) -> Result<&str, String> {
-        self.models
+        // 默认项必须存在且启用，否则目录无法给出可用默认模型。
+        if !self
+            .models
             .iter()
-            .find(|m| m.enabled && m.id == id)
-            .map(|m| m.model_id.as_str())
-            .ok_or_else(|| "所选模型不可用，请刷新模型列表".into())
-    }
-
-    /// 请求侧解析：显式选择的标识按目录校验，未选择或占位标识使用默认项。
-    pub fn resolve_requested(&self, requested: Option<&str>) -> Result<&str, String> {
-        let requested = requested
-            .map(str::trim)
-            .filter(|id| !id.is_empty() && *id != AGC_MODEL_PLATFORM_DEFAULT);
-        match requested {
-            Some(id) => self.resolve(id),
-            None => self.resolve(&self.default_model_id),
+            .any(|model| model.enabled && model.id == self.default_model_id)
+        {
+            return Err("所选模型不可用，请刷新模型列表".into());
         }
+        Ok(())
     }
 }
 
@@ -316,18 +305,30 @@ mod tests {
         let mut catalog =
             AgcModelCatalog::from_upstream_models(upstream(&["model-a", "model-b"]), 0).unwrap();
         assert!(catalog.validate().is_ok());
-        assert_eq!(catalog.resolve("model-a").unwrap(), "model-a");
+        assert_eq!(
+            catalog.resolve_requested_for(Some("model-a"), AgcModelAccess::Basic),
+            Ok("model-a")
+        );
         // 客户端不能直接指定实际模型名，只能回传目录标识。
-        assert!(catalog.resolve("model-c").is_err());
-        assert_eq!(catalog.resolve_requested(None).unwrap(), "model-a");
+        assert_eq!(
+            catalog.resolve_requested_for(Some("model-c"), AgcModelAccess::Basic),
+            Err(crate::AgcModelResolveError::Unavailable)
+        );
+        assert_eq!(
+            catalog.resolve_requested_for(None, AgcModelAccess::Basic),
+            Ok("model-a")
+        );
         assert_eq!(
             catalog
-                .resolve_requested(Some(AGC_MODEL_PLATFORM_DEFAULT))
+                .resolve_requested_for(Some(AGC_MODEL_PLATFORM_DEFAULT), AgcModelAccess::Basic)
                 .unwrap(),
             "model-a"
         );
         catalog.models[0].enabled = false;
-        assert!(catalog.resolve("model-a").is_err());
+        assert_eq!(
+            catalog.resolve_requested_for(Some("model-a"), AgcModelAccess::Basic),
+            Err(crate::AgcModelResolveError::Unavailable)
+        );
         assert!(catalog.validate().is_err());
     }