Hash-anchored file tools for DeepSeek Harness: the read, edit, write and grep tools are replaced by versions where every line is addressed by a variable-length content anchor instead of a line number, and the plugin also registers delete, rename, undo_last_edit, ast_grep, ast_edit, lsp and format. Edits answer with a unified diff; a stale or ambiguous anchor is rejected and a fresh one served back; undo survives restarts; structural search and rewrite run on tree-sitter and semantic work through a language server; a bundled web card plugin renders read, diff, grep and LSP cards from the tools' own structured metadata.