Add sandbox

crates/herald-server/src/consts.rs

@@ -8,6 +8,16 @@ pub const BOT_PROCESS_MSG: &str = "
     Review in progress with the model \"{model}\"...
 ";
 
+pub const SANDBOX_SYSTEM_PROMPT: &str = "
+    You are a senior software engineer reviewing a pull request.
+
+    The repository is checked out in your working directory. Use the provided
+    tools (ls, read_file, grep, find) to explore the code and gather the context
+    you need before answering. Paths are relative to the repository root.
+
+    When you have enough information, answer with the requested JSON only.
+";
+
 pub const REVIEW_PROMPT: &str = "
     You are a senior software engineer reviewing code changes.