Add system prompt and tool permission to agent2 (#35781)

Release Notes:

- N/A

---------

Co-authored-by: Ben Brandt <benjamin.j.brandt@gmail.com>
Co-authored-by: Max Brunsfeld <maxbrunsfeld@gmail.com>

crates/agent2/src/tests/test_tools.rs

@@ -19,6 +19,10 @@ impl AgentTool for EchoTool {
         "echo".into()
     }
 
+    fn needs_authorization(&self, _input: Self::Input, _cx: &App) -> bool {
+        false
+    }
+
     fn run(self: Arc<Self>, input: Self::Input, _cx: &mut App) -> Task<Result<String>> {
         Task::ready(Ok(input.text))
     }
@@ -40,6 +44,10 @@ impl AgentTool for DelayTool {
         "delay".into()
     }
 
+    fn needs_authorization(&self, _input: Self::Input, _cx: &App) -> bool {
+        false
+    }
+
     fn run(self: Arc<Self>, input: Self::Input, cx: &mut App) -> Task<Result<String>>
     where
         Self: Sized,
@@ -51,6 +59,31 @@ impl AgentTool for DelayTool {
     }
 }
 
+#[derive(JsonSchema, Serialize, Deserialize)]
+pub struct ToolRequiringPermissionInput {}
+
+pub struct ToolRequiringPermission;
+
+impl AgentTool for ToolRequiringPermission {
+    type Input = ToolRequiringPermissionInput;
+
+    fn name(&self) -> SharedString {
+        "tool_requiring_permission".into()
+    }
+
+    fn needs_authorization(&self, _input: Self::Input, _cx: &App) -> bool {
+        true
+    }
+
+    fn run(self: Arc<Self>, _input: Self::Input, cx: &mut App) -> Task<Result<String>>
+    where
+        Self: Sized,
+    {
+        cx.foreground_executor()
+            .spawn(async move { Ok("Allowed".to_string()) })
+    }
+}
+
 #[derive(JsonSchema, Serialize, Deserialize)]
 pub struct InfiniteToolInput {}
 
@@ -63,6 +96,10 @@ impl AgentTool for InfiniteTool {
         "infinite".into()
     }
 
+    fn needs_authorization(&self, _input: Self::Input, _cx: &App) -> bool {
+        false
+    }
+
     fn run(self: Arc<Self>, _input: Self::Input, cx: &mut App) -> Task<Result<String>> {
         cx.foreground_executor().spawn(async move {
             future::pending::<()>().await;
@@ -100,6 +137,10 @@ impl AgentTool for WordListTool {
         "word_list".into()
     }
 
+    fn needs_authorization(&self, _input: Self::Input, _cx: &App) -> bool {
+        false
+    }
+
     fn run(self: Arc<Self>, _input: Self::Input, _cx: &mut App) -> Task<Result<String>> {
         Task::ready(Ok("ok".to_string()))
     }