31 tools with visible schemas and descriptions, but significant quality gaps. Most descriptions are in Japanese (non-English), which limits LLM comprehension. Parameter descriptions are sparse or missing entirely. Many tools lack actionable error guidance. No output schemas documented. Tool names are verb-prefixed but descriptions often fail to explain WHEN to use each tool or what it returns. Average description length ~40 chars, well below the 194-char baseline for A+ tools. No tool annotations (readOnlyHint/destructiveHint). Error handling is minimal, most tools return raw JSON without recovery guidance.

• Translate all descriptions to English and expand to 50-200 characters. E.g., 'tabs_list' → 'List all open tabs in the specified Chrome profile. Returns tab IDs, URLs, and titles. Call this first to identify which tab to interact with.'
• Add output schemas to every tool. Document the structure of returned objects, arrays, and fields. E.g., tabs_list returns {tabs: [{tabId: number, url: string, title: string}], total: number}.
• Add descriptions to all parameters. E.g., tabId → 'The numeric ID of the target tab (from tabs_list)'; params → 'JSON object string of CDP parameters, e.g. {"enabled": true}'.
• Add tool annotations: mark read-only tools (screenshot, read_page, find) with readOnlyHint=true; mark destructive tools (click, evaluate, navigate) with destructiveHint=true; mark idempotent tools (navigate, reload) with idempotentHint=true.
• Enhance error responses with recovery guidance. E.g., 'Profile not found. Available profiles: [list]. Call set_active_profile(profile) or pass profile parameter.' instead of bare error JSON.