feat: add model registry replacement

Co-Authored-By: Anda Bot <noreply@anda.bot>

Author: zensh

CHANGELOG.md

@@ -2,6 +2,13 @@
 
 All notable changes to the Anda project will be documented in this file.
 
+## [0.13.2] — 2026-06-14
+
+### Added — anda_engine v0.13.2
+
+- **Runtime model registry replacement** — Added `Models::replace` to atomically replace a model registry from another `Models` instance, enabling callers to reload model configuration without preserving stale labels from the previous registry.
+
+
 ## [0.13.1] — 2026-06-14
 
 ### Changed — anda_engine v0.13.1

anda_engine/Cargo.toml

@@ -3,7 +3,7 @@ name = "anda_engine"
 description = "Agents engine for Anda -- an AI agent framework built with Rust, powered by ICP and TEEs."
 repository = "https://github.com/ldclabs/anda/tree/main/anda_engine"
 publish = true
-version = "0.13.1"
+version = "0.13.2"
 edition.workspace = true
 keywords.workspace = true
 categories.workspace = true

anda_engine/src/model.rs

@@ -203,6 +203,20 @@ impl Models {
         }
     }
 
+    /// Replaces this registry with a clone of another [`Models`] instance.
+    pub fn replace(&self, other: &Models) {
+        let model = other.model.load_full();
+        let models: HashMap<String, Vec<Model>> = HashMap::from_iter(
+            other
+                .models
+                .load()
+                .iter()
+                .map(|(k, v)| (k.clone(), v.clone())),
+        );
+        self.model.store(model);
+        self.models.store(Arc::new(models));
+    }
+
     /// Builds a registry from model configs by registering every resolved label.
     pub fn from_configs(configs: &[ModelConfig], http_client: reqwest::Client) -> Self {
         let models = Self::default();
@@ -1422,6 +1436,21 @@ mod tests {
             "primary-v2"
         );
 
+        let replacement = Models::default();
+        replacement.set_model(test_model("replacement-primary").with_labels(vec!["next".into()]));
+        let replaced = Models::default();
+        replaced.set("old".to_string(), test_model("old"));
+        replaced.replace(&replacement);
+        assert!(!replaced.contains("old"));
+        assert!(replaced.contains("next"));
+        assert_eq!(
+            replaced.get_model().unwrap().model_name(),
+            "replacement-primary"
+        );
+
+        replacement.set("later".to_string(), test_model("later"));
+        assert!(!replaced.contains("later"));
+
         let configs = vec![
             ModelConfig {
                 labels: vec!["primary".to_string()],