feat: load provider/model specified inside the recipe config (#6884)

Signed-off-by: Abhijay007 <Abhijay007j@gmail.com>
Co-authored-by: Zane Staggs <zane@squareup.com>

crates/goose-server/src/routes/agent.rs

@@ -254,18 +254,27 @@ async fn start_agent(
     }
 
     if let Some(recipe) = original_recipe {
-        manager
-            .update(&session.id)
-            .recipe(Some(recipe))
-            .apply()
-            .await
-            .map_err(|err| {
-                error!("Failed to update session with recipe: {}", err);
-                ErrorResponse {
-                    message: format!("Failed to update session with recipe: {}", err),
-                    status: StatusCode::INTERNAL_SERVER_ERROR,
+        let mut update = manager.update(&session.id).recipe(Some(recipe.clone()));
+
+        if let Some(ref settings) = recipe.settings {
+            if let Some(ref provider) = settings.goose_provider {
+                update = update.provider_name(provider);
+
+                if let Some(ref model) = settings.goose_model {
+                    if let Ok(model_config) = ModelConfig::new(model) {
+                        update = update.model_config(model_config);
+                    }
                 }
-            })?;
+            }
+        }
+
+        update.apply().await.map_err(|err| {
+            error!("Failed to update session with recipe: {}", err);
+            ErrorResponse {
+                message: format!("Failed to update session with recipe: {}", err),
+                status: StatusCode::INTERNAL_SERVER_ERROR,
+            }
+        })?;
     }
 
     // Refetch session to get all updates

crates/goose/src/agents/agent.rs

@@ -1577,7 +1577,8 @@ impl Agent {
             None => {
                 let model_name = config
                     .get_goose_model()
-                    .map_err(|_| anyhow!("Could not configure agent: missing model"))?;
+                    .ok()
+                    .ok_or_else(|| anyhow!("Could not configure agent: missing model"))?;
                 crate::model::ModelConfig::new(&model_name)
                     .map_err(|e| anyhow!("Could not configure agent: invalid model {}", e))?
             }