refactor: agent instructions (#764)

- replace `__TOOLS__` with `{{__tools__}}`
- after `.clear messages`, update system message of agent session
- show interpolated instructions in agent info

1 files changed, 4 insertions, 0 deletions

diff --git a/src/config/session.rs b/src/config/session.rs
index fe94aee..eccffa9 100644
--- a/src/config/session.rs
+++ b/src/config/session.rs
@@ -249,6 +249,10 @@ impl Session {
         self.dirty = true;
     }
 
+    pub fn update_role_prompt(&mut self, prompt: &str) {
+        self.role_prompt = prompt.to_string();
+    }
+
     pub fn clear_role(&mut self) {
         self.role_name.clear();
         self.role_prompt.clear();