Three tools with complete schemas and reasonable descriptions, but significant gaps in parameter documentation and error handling. Tool names are action-oriented (scan, latest_digest, keyword_list) and descriptions are present (avg 180 chars), meeting baseline expectations. However, parameter descriptions lack detail on constraints, valid ranges, and error conditions. No output schema documentation. Error handling is minimal, tools return plain strings without structured guidance for recovery. The scan tool accepts complex parameters (subreddits list, hours, min_score, limit_per_sub, max_clusters) but lacks validation rules in descriptions. latest_digest has a default directory but no guidance on what happens if no files exist (though code does handle it). keyword_list is trivial. Overall: functional but below production quality.

• Add explicit range constraints to scan parameters: hours (1 - 8760), min_score (0 - 10000), limit_per_sub (1 - 1000), max_clusters (1 - 20). Include in parameter descriptions, not just docstrings.
• Document output schemas. scan returns markdown string, specify structure (title, sections, cluster format). latest_digest returns file contents, note that it's raw markdown. keyword_list returns newline-delimited keywords.
• Enhance error messages with recovery guidance. E.g., 'Directory not found: {p}. Create it with: mkdir -p {p}' or 'No subreddits provided. Try: ["SaaS", "IndieHackers", "SideProject"]'.
• Expand keyword_list description to explain its purpose: 'Returns the built-in pain-pattern keywords used by scan(). Call this before launching a custom scan to understand what pain signals are detected.'
• Add parameter descriptions for scan's default values and their rationale. E.g., 'hours: lookback window in hours (default 168 = 1 week; range 1 - 8760). Longer windows capture slower-moving trends but increase API calls.'