Four tools with clear verb-noun naming (get_*, search_*) and complete input schemas. Descriptions are present but brief (10-20 chars for tools, 5-15 chars for params). All tools are READ_ONLY with proper error handling via HNAPIError. Output schemas are implicit (list[dict] or dict) but not formally documented. Parameter descriptions lack detail on constraints (e.g., 'limit: 1-30' is stated in tool description but not in schema). No tool annotations (readOnlyHint, idempotentHint). Missing output schema documentation and per-parameter validation guidance.

• Add formal output schema documentation to each tool. Document the structure of returned dicts (e.g., 'Returns list of {id: int, title: str, url: str, score: int, by: str, descendants: int, time: int}').
• Move constraint details into parameter schema descriptions. Change schema description from empty to 'Number of stories to return (1-30, default 10).' so LLMs see constraints in the schema, not just the tool docstring.
• Add tool annotations: set readOnlyHint=true and idempotentHint=true on all four tools to signal safety properties to agents.
• Enhance error messages with recovery guidance. Instead of 'RuntimeError(str(e))', return structured errors like '{"error": "api_timeout", "message": "HN API timed out. Retry in 5 seconds.", "retryable": true}'.
• Add pagination support: return total_count or next_cursor in responses, and accept offset/page parameters in get_top_stories, get_new_stories, and search_stories.