This Go MCP server exposes 9 well-defined clipboard management tools with consistent naming, explicit input schemas, and clear descriptions. All tools follow verb_noun naming conventions (search_clipboard, get_recent_items, copy_to_clipboard, etc.) and are registered with JSON Schema definitions visible in server.go. Descriptions are present for all tools and parameters, ranging from 40-80 characters. Input schemas include proper type definitions (string, number, boolean) with validation rules (regex patterns, enums, defaults). However, output schemas are NOT documented in the source code, handlers return mcp.CallToolResult but the structure is not specified. Error handling is minimal: handlers return basic errors without recovery guidance. The server uses STDIO transport, which is a hard architectural constraint preventing it from being accessed by hosted MCP clients. No tool annotations (readOnlyHint, destructiveHint, idempotentHint) are visible despite clear risk classifications (WRITE vs READ_ONLY). Security is reasonable (no secrets as parameters, input validation via regex), but audit logging and permission gates are absent.

• Document output schemas for all tools. For each handler, specify the returned JSON structure: e.g., search_clipboard returns {items: [{id: number, text: string, app: string, timestamp: string}], count: number, hasMore: boolean}. Include in code comments or separate schema.json.
• Add tool annotations: Mark WRITE tools (copy_to_clipboard, pin_item, unpin_item, export_history) with destructiveHint: true in server.go. Mark READ_ONLY tools (search_clipboard, get_recent_items, etc.) with readOnlyHint: true using mark3labs/mcp-go's WithDestructive() or equivalent pattern.
• Enhance error messages with recovery guidance. Change 'invalid since date: %w' to 'Invalid since date format. Expected ISO 8601 (e.g., 2024-01-15T10:30:00Z). Error: %w'. For 'item not found' errors, return 'Clipboard item ID %d not found. Available IDs: [list recent IDs].'
• Switch from STDIO to HTTP or HTTP+SSE transport. Update Run() to use server.ServeHTTP() or equivalent, binding to a network socket (e.g., localhost:8080). This enables remote clients and testing.
• Implement pagination for list tools. Add 'offset' and 'total_count' fields to responses for get_recent_items, get_items_by_app, and search_clipboard. Document in tool descriptions: 'Returns up to limit items. Use offset to fetch the next page.'
• Clarify get_clipboard_stats output. Update description to 'Get clipboard usage statistics including total item count, storage used in bytes, most frequent applications, and date range of history.' Then implement and document the actual return structure.