CloseClaw has 15 tools with complete input schemas and descriptions, but quality is inconsistent. Naming follows verb_noun convention (call_cron, read_pdf, write_file, shell). Descriptions range from adequate (read_pdf: 156 chars) to minimal (pwd: 28 chars). Most parameters have type and description, but several lack actionable constraints. No output schemas documented. Error handling is absent, tools do not guide recovery or categorize failures. Security concerns: shell tool is unrestricted; no permission gates; no audit trail declarations. Composition is reasonable (single responsibility per tool), but critical tools like shell lack dry-run or confirmation patterns.

• Add output schema documentation for all tools. Example for read_pdf: 'Returns {text: string, page_count: int, extracted_at: ISO8601}'. This enables LLMs to plan downstream calls.
• Expand pwd description to 50+ chars: 'Returns the absolute path of the current working directory. Use before file operations to verify context or construct relative paths.'
• Implement dry-run mode for shell tool: add optional 'dry_run: boolean' parameter. Return simulated output without executing. Prevents accidental destructive commands.
• Add error categorization to all tools. Example: 'If file not found, returns {error: "not_found", suggestion: "Try read_file() with a different path or list_files() to discover available files"}'. Guides LLM recovery.
• Document permission requirements for shell and write_* tools. Add to descriptions: 'Requires: exec permission. Audit: all invocations logged with user, command, timestamp, exit code.' Enables least-privilege configuration.