### Diagnostics Tool
**Tool Name**: `diagnostics`
**Tool Description**: Read latest cached LSP diagnostics for one file or a bounded workspace summary. Requires `lsp.enabled=true` and configured language server for useful data. Output is redacted and capped; stale or missing cache reports guidance instead of claiming project is clean.
**Tool Arguments**:
- `path`: optional, string. Existing file path under cwd/root. Omit for workspace summary.
- `limit`: optional, integer, min: 1, max: 200. Default 50.