Single tool with critical definition gaps. The tool 'count_characters' has a valid name and basic schema, but the parameter lacks a description (null value in source), and the output schema is completely undocumented. The tool description is minimal (10 chars, at boundary) and lacks context about when/why to use it. No error handling guidance, no output structure documented, and no indication of parameter constraints. This server demonstrates baseline functionality but fails to meet production quality standards for agent tooling.

• Add a non-null description to parameter 's': 'The input text to analyze (any UTF-8 string, no length limit). Returns the count of Unicode characters (not bytes).'
• Expand tool description to 50-100 chars: 'Counts the number of Unicode characters in the input text. Useful for text analysis, validation, or generating statistics. Returns an integer count as a string.'
• Document the output schema explicitly in the description: 'Returns a single Content object with type=text containing the character count as a decimal string (e.g., "42").'
• Add error handling documentation: 'Returns success with count for any valid UTF-8 input. Empty strings return "0". Non-UTF-8 sequences are counted as individual code units.'
• Consider whether the tool should support additional analysis: word count, line count, or grapheme clusters (user-perceived characters) as separate tools per composition pattern.