Constant CAPTURE_WINDOW_TOOL 

pub(crate) const CAPTURE_WINDOW_TOOL: &str = r#"{
  "name": "CaptureWindow",
  "description": "Screenshot any window on this machine — another AgentMux instance, your OWN instance's other windows (including a torn-off floating pane), or a non-AgentMux application. Target by pid (preferred; get one from DiscoverWindows) or by (partial, case-insensitive) title match. Prefer pid: AgentMux's own frontend actively rewrites window titles (tab switches, workspace renames), so a title match can go stale mid-session in a way a pid never does. The ONE exception is a window owned by a DIFFERENT OS user — withheld by default, because that is a human boundary rather than an agent one and no in-app notification can reach that person. If title_contains matches more than one window and you did not pass an explicit index, this returns every candidate (pid + title) instead of guessing — pass one of those pids back in, or use DiscoverWindows first. A single process can also own multiple top-level windows sharing the same pid — if pid matches more than one, pass an explicit index alongside it the same way. Every call is logged (who, what, which tier, a hash of the image, outcome) to an audit trail in this instance's own data dir. Returns a file path; use the Read tool on that path to view it yourself, or OpenMedia to show it to the user. The result may note likely_unrendered if the captured frame looks solid/near-solid-color even after a couple of internal retries — that CAN mean the window has not painted its first real frame yet, but it is only a heuristic (a legitimately solid-colored window trips it too).",
  "inputSchema": {
    "type": "object",
    "properties": {
      "pid": { "type": "number", "description": "Process id of the target window's owning process — from DiscoverWindows. Preferred over title_contains: stable for the process's whole lifetime, unlike its title. If more than one window shares this pid, also pass index to disambiguate." },
      "title_contains": { "type": "string", "description": "Substring to match against capturable windows' titles, case-insensitive — that includes non-AgentMux windows, not just AgentMux ones. Ignored if pid is given. Note the candidate/miss lists returned on an ambiguous or failed match identify a non-AgentMux window by pid only, never by title." },
      "index": { "type": "number", "description": "If multiple windows match title_contains (or share the given pid), which one to capture (0-based). Omit this when you expect exactly one match — if more than one actually matches, the tool returns the full candidate list instead of silently picking one." }
    }
  }
}"#;