fix(goose): only send agent-session-id when a session exists (#6657)

Signed-off-by: Adrian Cole <adrian@tetrate.io>

crates/goose/examples/image_tool.rs

@@ -10,7 +10,6 @@ use rmcp::model::{CallToolRequestParams, Content, Tool};
 use rmcp::object;
 use std::fs;
 use std::sync::Arc;
-use uuid::Uuid;
 
 #[tokio::main]
 async fn main() -> Result<()> {
@@ -63,10 +62,10 @@ async fn main() -> Result<()> {
                 },
             }
         });
-        let session_id = Uuid::new_v4().to_string();
         let (response, usage) = provider
-            .complete(
-                &session_id,
+            .complete_with_model(
+                None,
+                &provider.get_model_config(),
                 "You are a helpful assistant. Please describe any text you see in the image.",
                 &messages,
                 &[Tool::new("view_image", "View an image", input_schema)],