Loading ToolBench
A file versioning and checkpoint system for project directories with undo/redo capabilities
Checkpointer provides 4 file-manipulation tools with clear verb-noun naming (read_file, list_directory, write_file, edit_file_lines). All tools have descriptions and input schemas with types. However, descriptions are terse (10 - 50 chars), parameter descriptions lack detail on constraints and formats, output schemas are not documented, and error handling is minimal. Tool annotations are present but incomplete. No pagination support for list_directory despite a 500-item truncation limit. Security validation (path traversal checks) is solid, but error messages lack recovery guidance.
To replace a specific chunk in a file from start_line inclusive to end_line inclusive with content(one based indexing for lines), after it's snapshot has been taken.
To read the structure inside a directory, either surface level or recursively. Results will be truncated if they exceed 500.
To read the contents of a file with line numbers. Returns numbered lines. For large files, output is truncated to head+tail unless a specific range is given via start_line/end_line (1-based, inclusive).
To completely overwrite a file, after it's snapshot has been taken. (or to create a new file)
Output schemas not documented. LLMs cannot infer what read_file, list_directory, write_file, and edit_file_lines return. read_file returns a string with line numbers; list_directory returns list[str]; write_file and edit_file_lines return success/failure, none of this is declared in tool definitions.
Parameter descriptions lack format and constraint details. 'filepath' is described as 'Path to the file to read, relative to project directory' but does not specify: allowed characters, max length, whether symlinks are followed, or what happens if the path is absolute. 'start_line' and 'end_line' say '1-based, inclusive' but do not explain what happens if start_line > end_line or if end_line exceeds file length.
Error messages do not guide recovery. ValueError exceptions are raised (e.g., 'Filepath ... is outside the scope of the project directory') but do not suggest what the LLM should do next. Should it retry with a different path? Call a discovery tool? The agent has no guidance.
| Scored | Grade | Overall | Spec posture | Rubric |
|---|---|---|---|---|
| 2026-09-23 | D | 52 | 2026-07-28+ | v2 |
list_directory truncates at 500 items but offers no pagination. If a directory has 1000 files, the agent cannot retrieve the full list. No limit parameter, no offset/cursor, no total count returned.
write_file and edit_file_lines lack confirmation/dry-run support. These are destructive operations, an agent mistake overwrites or deletes file content irreversibly. No confirmation pattern or undo mechanism exposed to the agent (undo is internal via snapshots, not callable).