New Tool

When the user provides a tool name and description, create it following these steps:

1. Create/edit file in src/tools/ — one file per tool or group of related tools
2. Zod param schemas — every parameter uses z.string().describe("...") (or appropriate type)
3. Safety annotations — every tool must have readOnlyHint, destructiveHint, and openWorldHint
4. Return format — always return both content (text for LLM) and structuredContent (cast to Record<string, unknown>)
5. Error handling — wrap handler in try/catch, return isError: true on failure
6. Choose tool type:
   • Read-only / CMO tools: use server.tool()
   • Intelligence tools with HTML reports: use registerAppTool() from @modelcontextprotocol/ext-apps/server
7. Register — import and call registerXTools(server, client) in src/index.ts