Constant SHELL_STATUS_TOOL 

pub(crate) const SHELL_STATUS_TOOL: &str = r#"{
  "name": "ShellStatus",
  "description": "Query whether a shell started by Shell() is still running. Returns running status, exit code (when exited), and total line count so far. Use to poll for completion or check if a dev server is still up before starting a second one.",
  "inputSchema": {
    "type": "object",
    "properties": {
      "shell_id": { "type": "string", "description": "The shell_id returned by a prior Shell() call" }
    },
    "required": ["shell_id"]
  }
}"#;