Circle provides 19 tools with mostly complete schemas and descriptions. Naming follows verb_noun conventions (read_file, edit_file, delete_file, run_terminal_cmd). Most tools have 50-200 char descriptions and documented input parameters with types. However, several tools lack output schema documentation, some descriptions are generic, and error handling guidance is minimal. Tools like list_dir and glob_file_search have no visible input schema in the provided source. The ask_user tool has excellent schema depth, but most file/terminal tools are less detailed. No tool annotations (readOnlyHint, destructiveHint, idempotentHint) are present despite clear risk classifications.

• Add complete input schemas to list_dir, glob_file_search, grep, run_terminal_cmd, read_lints, update_memory, todo_write, get_skill_details, task_list, task_get, task_stop. Include parameter types, descriptions, and constraints (e.g., max_results, timeout).
• Document output schemas for all 19 tools. Specify returned fields, types, and pagination info. Example: read_file returns {content: string, encoding: string, size_bytes: number}.
• Add tool annotations: mark read_file, list_dir, grep, codebase_search, read_lints, task_list, task_get with readOnlyHint=true; mark delete_file, edit_file, run_terminal_cmd, update_memory, todo_write, task_stop with destructiveHint=true; mark idempotent tools with idempotentHint=true.
• Enhance error handling descriptions. For run_terminal_cmd, add: 'Returns exit code and stderr. If exit code != 0, suggest debugging steps or alternative commands.' For delete_file, add: 'Irreversible. Confirm before executing. Returns success or permission error.'
• Implement confirmation/dry-run for destructive tools. Add optional dry_run parameter to delete_file and edit_file. For run_terminal_cmd, add optional confirm_before_execute parameter to gate execution.