Retrieve a single news item by its ID. Returns: The matching NewsItem or None if not found.

List news, optionally filtered by category. Args: category: Optional category filter (e.g., 'tech'). limit: Maximum number of items to return. Returns: A list of NewsItem objects (sorted by published_at desc).

Return placards, optionally filtered by 'kind' (news, promo, tip, warning, success).

Simple health check tool.

Full-text search across title, summary, body, and tags. Args: query: Search query string. limit: Maximum number of results. Returns: Matching NewsItem objects (naive rank by occurrence count).