fix(buzz-agent): preserve prompt date context

Signed-off-by: Jimmy <1fe240cd1a8cf775f6f3060f115e5a303181f3abf28ad4cb0c2515f4a02b36a8@meshllm.communities.buzz.xyz>

Cargo.lock

@@ -979,6 +979,7 @@ dependencies = [
  "axum",
  "base64 0.22.1",
  "buzz-model-catalog",
+ "chrono",
  "dirs",
  "fs2",
  "futures",

crates/buzz-agent/Cargo.toml

@@ -62,6 +62,7 @@ serde = { workspace = true }
 serde_json = { workspace = true }
 serde_yaml = { workspace = true }
 reqwest = { workspace = true, features = ["json", "rustls", "form"] }
+chrono = { workspace = true }
 rmcp = { version = "3", default-features = false, features = ["client", "transport-child-process"] }
 arc-swap = "1"
 getrandom = "0.4"

crates/buzz-agent/src/prompt.rs

@@ -73,7 +73,7 @@ impl SessionPrompt {
         }
         state.composer.render(
             &PromptContext {
-                current_date_time: String::new(),
+                current_date_time: chrono::Utc::now().format("%Y-%m-%d %H:00 %:z").to_string(),
                 goose_mode: self.mode,
                 variables: Default::default(),
             },
@@ -119,6 +119,20 @@ mod tests {
         assert!(built.contains("Always ship the sprocket first."));
     }
 
+    #[tokio::test]
+    async fn override_renders_current_date_time() {
+        let prompt = SessionPrompt::new(GooseMode::Auto);
+        prompt
+            .set_override("It is currently {{ current_date_time }}".to_string())
+            .await;
+        let built = prompt.build(Path::new(".")).await.unwrap();
+        assert!(built.starts_with("It is currently 20"), "{built:?}");
+        assert!(
+            !built.contains("{{"),
+            "template variable was not rendered: {built:?}"
+        );
+    }
+
     #[tokio::test]
     async fn instructions_are_loaded_once() {
         let root = tempfile::tempdir().unwrap();