Server defines 9 tools with explicit JSON schemas and basic descriptions. However, most descriptions are under 50 characters (well below the 194-char baseline for A+ tools), lack context on WHEN to use each tool, and omit guidance on prerequisites or side effects. Parameter descriptions are sparse or missing entirely. No output schemas documented. Error handling is minimal, no recovery guidance or actionable error messages visible in code. Tool names follow verb_noun convention (positive), but descriptions fail to explain consequences of write operations (execute_script, inject_css, send_message, create_tab). No tool annotations (readOnlyHint/destructiveHint) despite clear risk stratification. Schemas are present but lack depth, many parameters have no description field.

• Expand all tool descriptions to 100 - 250 characters. Include WHAT the tool does, WHEN to use it (vs similar tools), and any side effects. Example: 'Execute DOM operations (querySelector, setText, click, etc.) on a specific tab. Use this to interact with page content. Note: Changes are visible to the user and may trigger page events.'
• Document output schemas for all tools. Specify what fields are returned, their types, and which IDs/references downstream tools need. Example for chrome_get_active_tab: '{tab_id: number, url: string, title: string, active: boolean}'
• Add tool annotations to input schemas. Mark read-only tools with 'readOnlyHint: true' and write tools with 'destructiveHint: true'. Example: {name: 'chrome_execute_script', inputSchema: {...}, readOnlyHint: false, destructiveHint: true}
• Add descriptions to all parameters, especially nested ones. For 'operation' in execute_script, document which action types require selector, value, attribute, etc. Use conditional language: 'Required for querySelector, querySelectorAll, setText, etc.'
• Add error handling guidance. Document what errors each tool can return (e.g., 'tab not found', 'invalid CSS syntax') and suggest recovery steps. Example: 'If tab_id is invalid, call chrome_get_all_tabs() to find the correct ID.'